Pub Date : 2022-06-14DOI: 10.1080/14488353.2022.2089374
Vineet Shah, J. Mackechnie
ABSTRACT Limited information is available on the transport behaviour of concrete after being exposed to carbon dioxide, which is one of the major reasons for the premature deterioration of reinforced concrete structures. This study investigates the changes induced in the transport characteristics of concrete after carbonation through conventional tests on concrete such as porosity, sorptivity, oxygen permeability and resistivity. A total of 10 concrete mixes were prepared using five supplementary cementitious materials (SCMs) (Class C fly ash, Class F fly ash, pumice, perlite and calcined clay) at the 30% cement replacement level and two water to binder ratios. The concrete samples were cured for 28 days in water and were subsequently placed under three different exposure conditions (2.5% CO2, oven 50°C and under water) for 60 days. In general, a reduction in porosity was observed on carbonation in all the concrete mixes. However, for SCM-incorporated concrete mixes, an inferior sorptivity, permeability and resistivity performance were observed specifically for lower compressive strength concrete mixes and clay mixes.
{"title":"Transport characteristics of concrete after carbonation","authors":"Vineet Shah, J. Mackechnie","doi":"10.1080/14488353.2022.2089374","DOIUrl":"https://doi.org/10.1080/14488353.2022.2089374","url":null,"abstract":"ABSTRACT Limited information is available on the transport behaviour of concrete after being exposed to carbon dioxide, which is one of the major reasons for the premature deterioration of reinforced concrete structures. This study investigates the changes induced in the transport characteristics of concrete after carbonation through conventional tests on concrete such as porosity, sorptivity, oxygen permeability and resistivity. A total of 10 concrete mixes were prepared using five supplementary cementitious materials (SCMs) (Class C fly ash, Class F fly ash, pumice, perlite and calcined clay) at the 30% cement replacement level and two water to binder ratios. The concrete samples were cured for 28 days in water and were subsequently placed under three different exposure conditions (2.5% CO2, oven 50°C and under water) for 60 days. In general, a reduction in porosity was observed on carbonation in all the concrete mixes. However, for SCM-incorporated concrete mixes, an inferior sorptivity, permeability and resistivity performance were observed specifically for lower compressive strength concrete mixes and clay mixes.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44002727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-13DOI: 10.1080/14488353.2022.2083288
Ebrahim Jokar, B. Aminnejad, A. Lork
ABSTRACT In the present study, an appropriate risk assessment and allocation model was developed between the various elements of PPP based infrastructure projects. For this purpose, after a review of the research literature and identification of the most important risks, with a case study on PPP-based freeway projects in Iran, a systematic model for risk assessment using fuzzy MCDM methods including FAHP has developed in order to critical risk assessment (Objective 1), FTOPSIS Identification of Common Risks in PPP Transportation Projects (Objective 2) and FDEMATEL for Allocation and Impact of Risk Between Different Project Elements (Objective 3). The results of risk analysis by FAHP method showed that economic and financing, construction and operational risks have the greatest impact, respectively. In addition, the results of FTOPSIS method showed that projects Isfahan-Shiraz Freeway, Salafchegan-Arak Freeway and Khorramabad-Arak Freeway, respectively, were more affected by risks. Finally, the results of FDEMATEL analysis show the degree of interaction and impact strength of risks for each risk and from the perspective of each project manager, which indicates a significant relationship between different risks. The results of this research can be used as a management model in the process of evaluation and risk management of PPP projects.
{"title":"A risk allocation model among the elements of freeway projects in public-private partnership (PPP) method using integrated fuzzy multi-criteria decision-making techniques","authors":"Ebrahim Jokar, B. Aminnejad, A. Lork","doi":"10.1080/14488353.2022.2083288","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083288","url":null,"abstract":"ABSTRACT In the present study, an appropriate risk assessment and allocation model was developed between the various elements of PPP based infrastructure projects. For this purpose, after a review of the research literature and identification of the most important risks, with a case study on PPP-based freeway projects in Iran, a systematic model for risk assessment using fuzzy MCDM methods including FAHP has developed in order to critical risk assessment (Objective 1), FTOPSIS Identification of Common Risks in PPP Transportation Projects (Objective 2) and FDEMATEL for Allocation and Impact of Risk Between Different Project Elements (Objective 3). The results of risk analysis by FAHP method showed that economic and financing, construction and operational risks have the greatest impact, respectively. In addition, the results of FTOPSIS method showed that projects Isfahan-Shiraz Freeway, Salafchegan-Arak Freeway and Khorramabad-Arak Freeway, respectively, were more affected by risks. Finally, the results of FDEMATEL analysis show the degree of interaction and impact strength of risks for each risk and from the perspective of each project manager, which indicates a significant relationship between different risks. The results of this research can be used as a management model in the process of evaluation and risk management of PPP projects.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49264082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-09DOI: 10.1080/14488353.2022.2083409
Amin Pourjahanshahi, H. Madani, M. Emadi
ABSTRACT The ever-increasing use of fibres in roller-compacted concrete pavement (RCCP) necessitates fully identifying the mechanical and permeability properties of RCCPs. Incorporating fibres in RCCP with different properties leads to a better comparative investigation that helps discover the unique effects of each fibre on the RCC characteristics. This aim was achieved via analyzing the test results of compressive and flexural strengths, flexural toughness, drying shrinkage, porosity, and water sorptivity. The reinforced RCCs were prepared by incorporating 0.5% and 1% of steel, Barchip, Kortta, and polypropylene fibres in a plain mixture. The plain mixture was chosen between nine mixtures, the differences of which were defined in w/c ratio, volume of cement content, and type of aggregate grading curve. The results indicated that increase in the volume of fibres from 0.5% to 1% could reduce the drying shrinkage rate and enhances the flexural toughness of FR-RCC. Furthermore, the water sorptivity and porosity were found to increase with the substitution of fibres in the RCC mixtures. Here, the water sorptivity of the specimens was highly dependent on the type and surface geometry of fibres. However, apart from other characteristics of fibres, the porosity was significantly increased, using fibres with a high aspect ratio.
{"title":"Assessing flexural and permeability performance of roller-compacted concrete pavement (RCCP) reinforcing with different types of synthetic fibres and crimped steel fibre","authors":"Amin Pourjahanshahi, H. Madani, M. Emadi","doi":"10.1080/14488353.2022.2083409","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083409","url":null,"abstract":"ABSTRACT The ever-increasing use of fibres in roller-compacted concrete pavement (RCCP) necessitates fully identifying the mechanical and permeability properties of RCCPs. Incorporating fibres in RCCP with different properties leads to a better comparative investigation that helps discover the unique effects of each fibre on the RCC characteristics. This aim was achieved via analyzing the test results of compressive and flexural strengths, flexural toughness, drying shrinkage, porosity, and water sorptivity. The reinforced RCCs were prepared by incorporating 0.5% and 1% of steel, Barchip, Kortta, and polypropylene fibres in a plain mixture. The plain mixture was chosen between nine mixtures, the differences of which were defined in w/c ratio, volume of cement content, and type of aggregate grading curve. The results indicated that increase in the volume of fibres from 0.5% to 1% could reduce the drying shrinkage rate and enhances the flexural toughness of FR-RCC. Furthermore, the water sorptivity and porosity were found to increase with the substitution of fibres in the RCC mixtures. Here, the water sorptivity of the specimens was highly dependent on the type and surface geometry of fibres. However, apart from other characteristics of fibres, the porosity was significantly increased, using fibres with a high aspect ratio.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43893744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-07DOI: 10.1080/14488353.2022.2083287
Asadollahfardi Gholamreza, Mojtaba Tayebi Jebeli, Amir Abbasi Khalil, H. Shahir
ABSTRACT Two crucial and challenging issues that threaten the environment are the significant amount of drinking water for concrete production and the vast quantity of waste foundry sand (WFS) generated each year. Using WFS and treated wastewater (TW) in concrete instead of sand and drinking water is a new method for solid waste recycling and water reuse. In this research study, two types of concrete mixtures were made by partial replacement of natural sand with WFS, and simultaneously using both the WFS and the TW as a part of sand and drinking water. Then, the mechanical properties and durability of mixtures were determined. The results indicated that increasing WFS and TW ratios decreased the workability of concrete. The sample contained 20% WFS plus 50% TW (W20-TW50) showed the best results, which increased compressive strength by 33.9, 19.2, and 6.2% at the age of 7, 28, and 90 days respectively, and decreased 30- minute and 24- hour water adsorption by 10.6 and 14.3% compared to the control samples. Furthermore, using WFS and TW simultaneously in concrete did not significantly impact on ultrasonic pulse velocity and rapid chloride migration. Scanning electron microscopy images indicated that the W20-TW50 sample had the best structural density and lowest pores.
{"title":"Investigation of mechanical and durability properties of concrete made with a mixture of waste foundry sand and domestic treated wastewater","authors":"Asadollahfardi Gholamreza, Mojtaba Tayebi Jebeli, Amir Abbasi Khalil, H. Shahir","doi":"10.1080/14488353.2022.2083287","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083287","url":null,"abstract":"ABSTRACT Two crucial and challenging issues that threaten the environment are the significant amount of drinking water for concrete production and the vast quantity of waste foundry sand (WFS) generated each year. Using WFS and treated wastewater (TW) in concrete instead of sand and drinking water is a new method for solid waste recycling and water reuse. In this research study, two types of concrete mixtures were made by partial replacement of natural sand with WFS, and simultaneously using both the WFS and the TW as a part of sand and drinking water. Then, the mechanical properties and durability of mixtures were determined. The results indicated that increasing WFS and TW ratios decreased the workability of concrete. The sample contained 20% WFS plus 50% TW (W20-TW50) showed the best results, which increased compressive strength by 33.9, 19.2, and 6.2% at the age of 7, 28, and 90 days respectively, and decreased 30- minute and 24- hour water adsorption by 10.6 and 14.3% compared to the control samples. Furthermore, using WFS and TW simultaneously in concrete did not significantly impact on ultrasonic pulse velocity and rapid chloride migration. Scanning electron microscopy images indicated that the W20-TW50 sample had the best structural density and lowest pores.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42948108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.1080/14488353.2022.2083425
Muneer K. Saeed
ABSTRACT This research investigates the impact of reduced graphene oxide (rGO) on the temperature gradient and associated stresses of mass mortar blocks. When the thermal stresses induced by the temperature gradient between the core of mass mortar or concrete blocks and their surfaces exceed the tensile strength of the concrete, cracking can occur. The measurements of temperature evolution at several locations in two mortar blocks with dimensions of 0.48 m x 0.41 m x 0.68 m are obtained from the literature. The first block was cast with a reference mix (REF) which contains only ordinary Portland cement, whereas the cement was replaced by 1.2% rGO for the other block. A finite element simulation of the two blocks was carried out and the measured temperature evolution was captured with a reasonable precision. Subsequently, numerical simulation was used to investigate the influence of rGO on the temperature rise and the associated potential of cracking in the mass mortar blocks with dimensions of 1 m x 1 m x 1 m and 2 m x 2 m x 2 m. It is noted that the rGO has a significant effect on reducing the the cracking indices of mass mortar blocks.
{"title":"Three-dimensional finite element modelling for influence of reduced graphene oxide on cracking index of mass mortar blocks due to heat of hydration","authors":"Muneer K. Saeed","doi":"10.1080/14488353.2022.2083425","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083425","url":null,"abstract":"ABSTRACT This research investigates the impact of reduced graphene oxide (rGO) on the temperature gradient and associated stresses of mass mortar blocks. When the thermal stresses induced by the temperature gradient between the core of mass mortar or concrete blocks and their surfaces exceed the tensile strength of the concrete, cracking can occur. The measurements of temperature evolution at several locations in two mortar blocks with dimensions of 0.48 m x 0.41 m x 0.68 m are obtained from the literature. The first block was cast with a reference mix (REF) which contains only ordinary Portland cement, whereas the cement was replaced by 1.2% rGO for the other block. A finite element simulation of the two blocks was carried out and the measured temperature evolution was captured with a reasonable precision. Subsequently, numerical simulation was used to investigate the influence of rGO on the temperature rise and the associated potential of cracking in the mass mortar blocks with dimensions of 1 m x 1 m x 1 m and 2 m x 2 m x 2 m. It is noted that the rGO has a significant effect on reducing the the cracking indices of mass mortar blocks.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43712210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.1080/14488353.2022.2083410
S. Asif, Naveed Ahmad
ABSTRACT Population growth and industrialisation have led to the accretion of rubber waste which increased public concern about environmental pollution. The use of crumb rubber (CR) as a bitumen modifier is an effective way to protect the environment from pollution. The study of different properties of crumb rubber modified bitumen (CRMB) is the substance area of today’s research. Base bitumen having penetration grade 60/70 and crumb rubber proportions from 4% to 12% by weight of bitumen content following wet process was used. Physical properties, rheological properties, chemical properties and binding properties of unaged CRMB and aged CRMB were evaluated by using conventional tests, dynamic shear rheometer (DSR), Fourier transform infrared spectroscopy (FTIR) and bitumen bond strength (BBS) test, respectively. Modification index of complex shear modulus (G*) of bitumen increased with an increase in CR content. FTIR spectra of aged CRMB illustrated that rate of change in indices decreased with an increase in CR content which shows ageing resistance of CRMB. Crumb rubber influenced the adhesion phenomenon of bitumen and aged CRMB tends to achieve better adhesion effects. BBS results revealed that in dry conditions, POTS values of samples after peaking tended to decrease with an increase in the concentration of crumb rubber above 8%.
{"title":"Experimental investigation of impact of crumb rubber on modified bitumen","authors":"S. Asif, Naveed Ahmad","doi":"10.1080/14488353.2022.2083410","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083410","url":null,"abstract":"ABSTRACT Population growth and industrialisation have led to the accretion of rubber waste which increased public concern about environmental pollution. The use of crumb rubber (CR) as a bitumen modifier is an effective way to protect the environment from pollution. The study of different properties of crumb rubber modified bitumen (CRMB) is the substance area of today’s research. Base bitumen having penetration grade 60/70 and crumb rubber proportions from 4% to 12% by weight of bitumen content following wet process was used. Physical properties, rheological properties, chemical properties and binding properties of unaged CRMB and aged CRMB were evaluated by using conventional tests, dynamic shear rheometer (DSR), Fourier transform infrared spectroscopy (FTIR) and bitumen bond strength (BBS) test, respectively. Modification index of complex shear modulus (G*) of bitumen increased with an increase in CR content. FTIR spectra of aged CRMB illustrated that rate of change in indices decreased with an increase in CR content which shows ageing resistance of CRMB. Crumb rubber influenced the adhesion phenomenon of bitumen and aged CRMB tends to achieve better adhesion effects. BBS results revealed that in dry conditions, POTS values of samples after peaking tended to decrease with an increase in the concentration of crumb rubber above 8%.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45253187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.1080/14488353.2022.2083404
Vahid Najafi moghaddam Gilani, Gholam Hossein Hamedi, M. Esmaeeli, Mohammad Habibzadeh, Morteza Hosseinpour Eshkiknezhad
ABSTRACT Stone matrix asphalt (SMA) mixtures are the most resistant type of asphalt mixtures today in which the aggregate skeleton bears the bulk load. In this study, the effect of nano hydrated lime (NHL) on the moisture sensitivity of SMA mixtures was investigated. To examine the effect of NHL, the surface free energy (SFE) method and the dynamic modulus (DM) test were applied under wet and dry conditions on mixtures constructed with limestone and granite aggregates. The SFE results indicated that the granite aggregates had a greater polar component and limestone aggregates had a higher non-polar component which shows their higher moisture resistance. The adhesion free energy (AFE) results showed that the adhesion of base bitumen and limestone aggregate was higher, and using NHL improved the AFE values. The results of DM tests indicated that as the load cycles raised, the wet to dry DM ratio reduced and using NHL increased this ratio. The reduction slope of the DM ratio in samples constructed with granite aggregates showed a faster trend compared to limestone aggregates, and using NHL improved the resistance of SMA mixtures constructed with granite aggregates to moisture more than limestone aggregates.
{"title":"Presentation of thermodynamic and dynamic modules methods to investigate the effect of nano hydrated lime on moisture damage of stone matrix asphalt","authors":"Vahid Najafi moghaddam Gilani, Gholam Hossein Hamedi, M. Esmaeeli, Mohammad Habibzadeh, Morteza Hosseinpour Eshkiknezhad","doi":"10.1080/14488353.2022.2083404","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083404","url":null,"abstract":"ABSTRACT Stone matrix asphalt (SMA) mixtures are the most resistant type of asphalt mixtures today in which the aggregate skeleton bears the bulk load. In this study, the effect of nano hydrated lime (NHL) on the moisture sensitivity of SMA mixtures was investigated. To examine the effect of NHL, the surface free energy (SFE) method and the dynamic modulus (DM) test were applied under wet and dry conditions on mixtures constructed with limestone and granite aggregates. The SFE results indicated that the granite aggregates had a greater polar component and limestone aggregates had a higher non-polar component which shows their higher moisture resistance. The adhesion free energy (AFE) results showed that the adhesion of base bitumen and limestone aggregate was higher, and using NHL improved the AFE values. The results of DM tests indicated that as the load cycles raised, the wet to dry DM ratio reduced and using NHL increased this ratio. The reduction slope of the DM ratio in samples constructed with granite aggregates showed a faster trend compared to limestone aggregates, and using NHL improved the resistance of SMA mixtures constructed with granite aggregates to moisture more than limestone aggregates.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44396762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-02DOI: 10.1080/14488353.2022.2083426
Sudheer Kumar, K. Kapoor, R. Singh, Paramveer Singh
ABSTRACT Recent advancement in construction practices demands the utilisation of construction materials in a sustainable way which promotes the use of industrial by-products as Supplementary Cementitious Materials (SCMs) and alternative aggregates to protect diminishing natural resources. The present study proposed the utilisation of high-volume fly ash in the production of Self-Compacting Concrete (SCC) made with varying proportions of coarse and fine recycled aggregates. Natural Aggregates (NA) of both coarse and fine type in high-volume fly ash SCC were replaced with the respective type of recycled aggregates at the dosage of 0%, 50% and 100% by volume and their hardened state behaviour was studied in terms of compressive strength, chloride ion permeability, initial rate of water absorption, sorptivity coefficient and sulphate resistance. Results of the investigation recommends uses of Silica Fume (SF) at 10% dosages in ternary blends of cement along with high-volume fly ash for the production of SCC at 50% replacement level of both coarse and fine recycled aggregates, without compromising the hardened state properties of concrete.
{"title":"Application of silica fume in high-volume fly ash self-compacting recycled aggregate concrete","authors":"Sudheer Kumar, K. Kapoor, R. Singh, Paramveer Singh","doi":"10.1080/14488353.2022.2083426","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083426","url":null,"abstract":"ABSTRACT Recent advancement in construction practices demands the utilisation of construction materials in a sustainable way which promotes the use of industrial by-products as Supplementary Cementitious Materials (SCMs) and alternative aggregates to protect diminishing natural resources. The present study proposed the utilisation of high-volume fly ash in the production of Self-Compacting Concrete (SCC) made with varying proportions of coarse and fine recycled aggregates. Natural Aggregates (NA) of both coarse and fine type in high-volume fly ash SCC were replaced with the respective type of recycled aggregates at the dosage of 0%, 50% and 100% by volume and their hardened state behaviour was studied in terms of compressive strength, chloride ion permeability, initial rate of water absorption, sorptivity coefficient and sulphate resistance. Results of the investigation recommends uses of Silica Fume (SF) at 10% dosages in ternary blends of cement along with high-volume fly ash for the production of SCC at 50% replacement level of both coarse and fine recycled aggregates, without compromising the hardened state properties of concrete.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48405525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1080/14488353.2022.2083045
V. P. Le, A. Le, M. Nguyen, Quang Phuc Nguyen
ABSTRACT A temperature correction model for Falling Weight Deflectometer (FWD) backcalculated dynamic modulus was developed and validated in this study. FWD test was conducted to determine the field dynamic modulus, while the indirect tensile (IDT) dynamic modulus test was used to measure laboratory dynamic modulus. A temperature correction model was developed considering the effect of FWD loading frequency and pavement temperature. It was validated using field FWD data obtained from 26 Westrack pavement sections and Korean national highways’ long-term pavement performance database. Also, the correction factor was compared with similar existing models using FWD testing in the field. It was observed from study results that the temperature correction model is capable of predicting the dynamic modulus accurately.
{"title":"Development and validation of a temperature correction model for FWD backcalculated moduli","authors":"V. P. Le, A. Le, M. Nguyen, Quang Phuc Nguyen","doi":"10.1080/14488353.2022.2083045","DOIUrl":"https://doi.org/10.1080/14488353.2022.2083045","url":null,"abstract":"ABSTRACT A temperature correction model for Falling Weight Deflectometer (FWD) backcalculated dynamic modulus was developed and validated in this study. FWD test was conducted to determine the field dynamic modulus, while the indirect tensile (IDT) dynamic modulus test was used to measure laboratory dynamic modulus. A temperature correction model was developed considering the effect of FWD loading frequency and pavement temperature. It was validated using field FWD data obtained from 26 Westrack pavement sections and Korean national highways’ long-term pavement performance database. Also, the correction factor was compared with similar existing models using FWD testing in the field. It was observed from study results that the temperature correction model is capable of predicting the dynamic modulus accurately.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41474258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1080/14488353.2022.2082632
E. Denneman, A. Edmunds, P. Alex, G. Wilson
ABSTRACT The objective of this paper is to assess whether existing pavement temperature prediction algorithms can be used to reliably determine Performance Grade (PG) design temperatures for Australian asphalt pavements. The results show good agreement between internationally and locally developed pavement temperature algorithms for the prediction of high pavement design temperature. There is more variability between models in the prediction of low pavement design temperature. The paper also provides a set of PG grading results for a range of Australian asphalt binders. The findings indicate that for a given design situation harder bitumen, ormore highly modified binder would be specified in Australia than in jurisdictions using the PG system.
{"title":"Application of pavement temperature prediction algorithms in performance grade (PG) binder selection for Australia","authors":"E. Denneman, A. Edmunds, P. Alex, G. Wilson","doi":"10.1080/14488353.2022.2082632","DOIUrl":"https://doi.org/10.1080/14488353.2022.2082632","url":null,"abstract":"ABSTRACT The objective of this paper is to assess whether existing pavement temperature prediction algorithms can be used to reliably determine Performance Grade (PG) design temperatures for Australian asphalt pavements. The results show good agreement between internationally and locally developed pavement temperature algorithms for the prediction of high pavement design temperature. There is more variability between models in the prediction of low pavement design temperature. The paper also provides a set of PG grading results for a range of Australian asphalt binders. The findings indicate that for a given design situation harder bitumen, ormore highly modified binder would be specified in Australia than in jurisdictions using the PG system.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45453952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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