Pub Date : 2023-11-14DOI: 10.1007/s41062-023-01278-4
M. Shariful Islam, Benjamin J. Mohr
{"title":"Long-term properties and microstructural characterization of natural clinoptilolite zeolite-based cementitious materials","authors":"M. Shariful Islam, Benjamin J. Mohr","doi":"10.1007/s41062-023-01278-4","DOIUrl":"https://doi.org/10.1007/s41062-023-01278-4","url":null,"abstract":"","PeriodicalId":13525,"journal":{"name":"Innovative Infrastructure Solutions","volume":"55 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902955","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 : 2023-11-14DOI: 10.1007/s41062-023-01277-5
Asmaa A. Mashaly, Mohamed G. Mahdy, Walid E. Elemam
Abstract Sustainable eco-friendly ultra-high-performance concrete (UHPC) is a remarkable innovation in construction technology. This research aims to develop sustainable UHPC by incorporating various supplementary materials, including silica fume (SF), glass powder (G L P), fly ash (FA), limestone powder (LP), and granite powder (G r P), as partial replacements for cement and fine aggregate. To achieve this goal, a total of twenty-seven concrete mixtures were designed using response surface methodology (RSM) and tested in order to determine the optimal combination of these supplementary materials for enhancing the mechanical properties of UHPC. Mathematical models were constructed using analysis of variance (ANOVA) test. The results of the study suggest that it is indeed possible to produce sustainable UHPC with reduced CO 2 emissions and improved mechanical properties by utilizing the suggested supplementary materials. In particular, the compressive and flexural strengths of the concrete significantly improved when high proportions of LP, SF and G L P, and low proportions of FA and G r P were used. Among the various mixtures tested, the mixture containing 12.5% SF, 15% FA, and 10% G L P as partial replacements of cement, along with 12.5% G r P and 50% LP as partial replacements of fine aggregate, exhibited the highest compressive and flexural strength at all curing ages, the compressive strength was 133, 175.8, 180.2 MPa at age 7, 28 and 90 days, respectively, meanwhile the flexural strength was 38.5 MPa at age 28 days. The SEM results revealed that the higher proportion of LP, FA, and G L P contributed to an enhanced concrete microstructure, further validating the positive impact of these supplementary materials on UHPC's mechanical properties.
可持续环保超高性能混凝土(UHPC)是建筑技术领域的一项重大创新。本研究旨在通过加入各种补充材料，包括硅灰(SF)，玻璃粉(G LP)，粉煤灰(FA)，石灰石粉(LP)和花岗岩粉(G r P)，作为水泥和细骨料的部分替代品，开发可持续的UHPC。为了实现这一目标，使用响应面法(RSM)设计了总共27种混凝土混合物，并进行了测试，以确定这些补充材料的最佳组合，以提高UHPC的力学性能。采用方差分析(ANOVA)检验建立数学模型。研究结果表明，通过使用建议的补充材料，确实有可能生产出减少二氧化碳排放并改善机械性能的可持续UHPC。特别是,混凝土的抗压和抗弯强度显著提高,当高比例的LP、科幻和G L P,低比例的FA和G r P。结果表明:12.5% SF、15% FA和10% gl P部分替代水泥，12.5% gr P和50% LP部分替代细骨料的混合料在养护龄期的抗压强度和抗折强度最高，龄期7、28和90天的抗压强度分别为133、175.8、180.2 MPa，龄期28天的抗折强度为38.5 MPa。SEM结果表明，高掺量的LP、FA和G LP有助于增强混凝土的微观结构，进一步验证了这些补充材料对UHPC力学性能的积极影响。
{"title":"Optimal design and characteristics of sustainable eco-friendly ultra-high-performance concrete","authors":"Asmaa A. Mashaly, Mohamed G. Mahdy, Walid E. Elemam","doi":"10.1007/s41062-023-01277-5","DOIUrl":"https://doi.org/10.1007/s41062-023-01277-5","url":null,"abstract":"Abstract Sustainable eco-friendly ultra-high-performance concrete (UHPC) is a remarkable innovation in construction technology. This research aims to develop sustainable UHPC by incorporating various supplementary materials, including silica fume (SF), glass powder (G L P), fly ash (FA), limestone powder (LP), and granite powder (G r P), as partial replacements for cement and fine aggregate. To achieve this goal, a total of twenty-seven concrete mixtures were designed using response surface methodology (RSM) and tested in order to determine the optimal combination of these supplementary materials for enhancing the mechanical properties of UHPC. Mathematical models were constructed using analysis of variance (ANOVA) test. The results of the study suggest that it is indeed possible to produce sustainable UHPC with reduced CO 2 emissions and improved mechanical properties by utilizing the suggested supplementary materials. In particular, the compressive and flexural strengths of the concrete significantly improved when high proportions of LP, SF and G L P, and low proportions of FA and G r P were used. Among the various mixtures tested, the mixture containing 12.5% SF, 15% FA, and 10% G L P as partial replacements of cement, along with 12.5% G r P and 50% LP as partial replacements of fine aggregate, exhibited the highest compressive and flexural strength at all curing ages, the compressive strength was 133, 175.8, 180.2 MPa at age 7, 28 and 90 days, respectively, meanwhile the flexural strength was 38.5 MPa at age 28 days. The SEM results revealed that the higher proportion of LP, FA, and G L P contributed to an enhanced concrete microstructure, further validating the positive impact of these supplementary materials on UHPC's mechanical properties.","PeriodicalId":13525,"journal":{"name":"Innovative Infrastructure Solutions","volume":"58 45","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134901386","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 : 2023-11-13DOI: 10.1007/s41062-023-01290-8
Hamza Mobideen, Nasim Shatarat, Hasan Katkhuda, Yasser Al-Hunaiti, Ahmad A. Al-Qaisia
{"title":"Influence of basalt stirrups and bars on the performance of shear in beams","authors":"Hamza Mobideen, Nasim Shatarat, Hasan Katkhuda, Yasser Al-Hunaiti, Ahmad A. Al-Qaisia","doi":"10.1007/s41062-023-01290-8","DOIUrl":"https://doi.org/10.1007/s41062-023-01290-8","url":null,"abstract":"","PeriodicalId":13525,"journal":{"name":"Innovative Infrastructure Solutions","volume":"58 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136283599","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 : 2023-11-10DOI: 10.1007/s41062-023-01279-3
Walaa M. Abd El-Gawad, Essam A. Mossalam, Mahmoud Gharieb
Abstract This is the first study to look into the use of modified feldspars as anticorrosive pigments in the coatings industry. Herein, novel anticorrosive composite pigments were prepared by the chemical deposition of thin films of different oxides (e.g., zinc oxide and vanadium oxide with doloresite phase) on the surface of feldspar, which comprises 80% of the whole structure. A new vanadium oxide (e.g., doloresite) was chosen due to its IV oxidation state and excellent anticorrosive characteristics. ZnO is also well-known for its high resistance to corrosion. Firstly, the synthesis of the composite pigments was done, and then, they were characterized via XRD, SEM/EDX, XRF, and TGA. The composite pigments were incorporated into solvent-based epoxy coatings to evaluate their anticorrosive performance on reinforced concrete steel. Their corrosion resistances were determined using linear polarization resistivity and electrochemical impedance spectroscopy techniques. The physico-mechanical properties of the dry coats containing the prepared composite pigments were also evaluated. The results revealed that the polarization resistivity ( R po ) of coatings containing Zn/F ranged from 5900 to 3900 Ohm.cm 2 and that of V / F ranged from 7077 to 5500 Ohm.cm 2 , while the resistivity of uncoated rebar was from 1900 to 1300 Ohm.cm 2 . These results confirm that these novel pigments (e.g., ZnO/feldspar and doloresite/feldspar) could provide high corrosion resistivity for concrete structures that are immersed in chloride-laden environments. These composite pigments will be eco-friendly with a low impact on humans and the environment as they contain very low concentrations of heavy metals, besides their high efficiency and economic feasibility.
{"title":"Enhancing corrosion resistance in reinforced concrete structures by using innovative eco-friendly composite pigments","authors":"Walaa M. Abd El-Gawad, Essam A. Mossalam, Mahmoud Gharieb","doi":"10.1007/s41062-023-01279-3","DOIUrl":"https://doi.org/10.1007/s41062-023-01279-3","url":null,"abstract":"Abstract This is the first study to look into the use of modified feldspars as anticorrosive pigments in the coatings industry. Herein, novel anticorrosive composite pigments were prepared by the chemical deposition of thin films of different oxides (e.g., zinc oxide and vanadium oxide with doloresite phase) on the surface of feldspar, which comprises 80% of the whole structure. A new vanadium oxide (e.g., doloresite) was chosen due to its IV oxidation state and excellent anticorrosive characteristics. ZnO is also well-known for its high resistance to corrosion. Firstly, the synthesis of the composite pigments was done, and then, they were characterized via XRD, SEM/EDX, XRF, and TGA. The composite pigments were incorporated into solvent-based epoxy coatings to evaluate their anticorrosive performance on reinforced concrete steel. Their corrosion resistances were determined using linear polarization resistivity and electrochemical impedance spectroscopy techniques. The physico-mechanical properties of the dry coats containing the prepared composite pigments were also evaluated. The results revealed that the polarization resistivity ( R po ) of coatings containing Zn/F ranged from 5900 to 3900 Ohm.cm 2 and that of V / F ranged from 7077 to 5500 Ohm.cm 2 , while the resistivity of uncoated rebar was from 1900 to 1300 Ohm.cm 2 . These results confirm that these novel pigments (e.g., ZnO/feldspar and doloresite/feldspar) could provide high corrosion resistivity for concrete structures that are immersed in chloride-laden environments. These composite pigments will be eco-friendly with a low impact on humans and the environment as they contain very low concentrations of heavy metals, besides their high efficiency and economic feasibility.","PeriodicalId":13525,"journal":{"name":"Innovative Infrastructure Solutions","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092530","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 : 2023-11-09DOI: 10.1007/s41062-023-01276-6
Nermeen Fouad Ashour, Ashraf Kamal Hussein, Rami Mahmoud El Sherbeeny, Omar Osman Omar, Safwan Abbas Khedr
Abstract The research investigates the effectiveness of a ground improvement technique that involves the electro-cementation of an onshore calcareous sand containing 95.3% calcium carbonate through a series of laboratory experiments. Colloidal silica (CS) nanoparticles and alumina powder were introduced as pozzolanic materials in the sand, and a direct current (DC) was passed through the sand-silica-alumina mix inside an electrokinetic (EK) cell. The method resulted in the electro-cementation of the calcareous sand through the formation of calcium silicate hydrates (C–S–Hs) and calcium aluminate hydrates (C–A–Hs) as products of the pozzolanic reactions between Ca(OH) 2 , SiO 2 and Al 2 O 3 after electrolysis occurred. Iron-rich cements were also formed by the degradation of anodes. These newly formed compounds changed the nature of the treated soil from a granular material into a rock. Results show that the compressive strength of the resulting rock formation is significantly improved. The treatment can be considered as an artificial lithification process through which the nature of the treated soil was changed from a granular material into a rock formation. The electro-cementation achieved by the treatment was further assessed by spectroscopic analyses including FE-SEM, EDX and XRD, which confirmed the formation of cementing agents within the structure of the treated sand. Potential applications of the technique include caissons, highway construction projects, dune fixation and erosion control, in addition to liquefaction mitigation due to electrolysis of pore water and plugging the pores with cementitious materials.
{"title":"Electro-cementation of calcareous sand using colloidal silica (CS) nanoparticles and alumina powder","authors":"Nermeen Fouad Ashour, Ashraf Kamal Hussein, Rami Mahmoud El Sherbeeny, Omar Osman Omar, Safwan Abbas Khedr","doi":"10.1007/s41062-023-01276-6","DOIUrl":"https://doi.org/10.1007/s41062-023-01276-6","url":null,"abstract":"Abstract The research investigates the effectiveness of a ground improvement technique that involves the electro-cementation of an onshore calcareous sand containing 95.3% calcium carbonate through a series of laboratory experiments. Colloidal silica (CS) nanoparticles and alumina powder were introduced as pozzolanic materials in the sand, and a direct current (DC) was passed through the sand-silica-alumina mix inside an electrokinetic (EK) cell. The method resulted in the electro-cementation of the calcareous sand through the formation of calcium silicate hydrates (C–S–Hs) and calcium aluminate hydrates (C–A–Hs) as products of the pozzolanic reactions between Ca(OH) 2 , SiO 2 and Al 2 O 3 after electrolysis occurred. Iron-rich cements were also formed by the degradation of anodes. These newly formed compounds changed the nature of the treated soil from a granular material into a rock. Results show that the compressive strength of the resulting rock formation is significantly improved. The treatment can be considered as an artificial lithification process through which the nature of the treated soil was changed from a granular material into a rock formation. The electro-cementation achieved by the treatment was further assessed by spectroscopic analyses including FE-SEM, EDX and XRD, which confirmed the formation of cementing agents within the structure of the treated sand. Potential applications of the technique include caissons, highway construction projects, dune fixation and erosion control, in addition to liquefaction mitigation due to electrolysis of pore water and plugging the pores with cementitious materials.","PeriodicalId":13525,"journal":{"name":"Innovative Infrastructure Solutions","volume":" 30","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243406","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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