Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.4.7
Shaymaa Abbas Abdulsada, T. Török
This work presents a study of the total chloride contents in concrete and the corrosion process by testing electrical resistivity and half-cell potential of concrete samples. The analysis was based on an experimental investigation of the samples with the time of immersion in 3.5% mass NaCl aqueous solution at room temperature for 18 months, according to European Standards. For this study, different mixtures of concrete were prepared by adding two types of superplasticizers and calcium nitrate inhibitor, in different concentrations. The results of the Cl- ions test showed that all the samples, after an immersion testing period of six months, contained high concentrations of Cl- ions. Samples C4 with 3% calcium nitrate inhibitor and Oxydtron superplasticizer as well as C3 with 3% calcium nitrate inhibitor and Mapei Dynamon SR 31 superplasticizer, showed good resistance to corrosion, in the tested environment. It was also proved by the results of several sets of measurements of the electrical resistivity and half-cell potentials carried on the concrete test samples, to the end of the 18 months testing period.
通过测试混凝土样品的电阻率和半电池电位，研究了混凝土中总氯化物含量和腐蚀过程。根据欧洲标准，该分析是基于对样品在室温下浸泡在3.5%质量NaCl水溶液中18个月的实验调查。在本研究中，通过添加两种不同浓度的高效减水剂和硝酸钙抑制剂，制备了不同的混凝土混合物。氯离子测试结果表明，经过6个月的浸泡测试，所有样品都含有高浓度的氯离子。在测试环境中，添加3%硝酸钙缓蚀剂和Oxydtron高效减水剂的C4样品和添加3%硝酸钙缓蚀剂和Mapei Dynamon SR 31高效减水剂的C3样品表现出良好的耐腐蚀性。在18个月的测试期结束前，对混凝土测试样品进行了几组电阻率和半电池电位测量，结果也证明了这一点。
{"title":"Investigations on the resistivity of XD3 reinforced concrete for chloride ions and corrosion with calcium nitrate inhibitor and superplasticizers","authors":"Shaymaa Abbas Abdulsada, T. Török","doi":"10.32047/cwb.2020.25.4.7","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.4.7","url":null,"abstract":"This work presents a study of the total chloride contents in concrete and the corrosion process by testing electrical resistivity and half-cell potential of concrete samples. The analysis was based on an experimental investigation of the samples with the time of immersion in 3.5% mass NaCl aqueous solution at room temperature for 18 months, according to European Standards. For this study, different mixtures of concrete were prepared by adding two types of superplasticizers and calcium nitrate inhibitor, in different concentrations. The results of the Cl- ions test showed that all the samples, after an immersion testing period of six months, contained high concentrations of Cl- ions. Samples C4 with 3% calcium nitrate inhibitor and Oxydtron superplasticizer as well as C3 with 3% calcium nitrate inhibitor and Mapei Dynamon SR 31 superplasticizer, showed good resistance to corrosion, in the tested environment. It was also proved by the results of several sets of measurements of the electrical resistivity and half-cell potentials carried on the concrete test samples, to the end of the 18 months testing period.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"76 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90991936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.5.7
M. Sanytsky, Aleksander Usherov-Marshak, T. Kropyvnytska, Iryna Heviuk
The paper presents the results of research on the influence of granulated blast furnace slag, natural pozzolana [superzeolite], and limestone powder on the performance of multi-component cements. It was found that the synergistic combination of mineral additives of different genesis, taking into account the influence of the particle size distribution [PSD] by volume and surface area, as well as the determination of indicators of the influence of physical factors such as water demand, bleeding, pozzolanic activity, the heat of hydration on the set of properties of paste and concrete: workability, standard, and early strength, global warming potential, allows to obtain technologically optimized multi-component Portland cements. The results showed that the production of multi-component Portland cement with high early strength CEM II/B-M 42.5 R-LH ensures separate grinding of individual constituents, optimization of grain composition of slag, superzeolite, and limestone powder taking into account the PSD by surface area.
{"title":"Performance of multicomponent Portland cements containing granulated blast furnace slag, zeolite, and limestone","authors":"M. Sanytsky, Aleksander Usherov-Marshak, T. Kropyvnytska, Iryna Heviuk","doi":"10.32047/cwb.2020.25.5.7","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.5.7","url":null,"abstract":"The paper presents the results of research on the influence of granulated blast furnace slag, natural pozzolana [superzeolite], and limestone powder on the performance of multi-component cements. It was found that the synergistic combination of mineral additives of different genesis, taking into account the influence of the particle size distribution [PSD] by volume and surface area, as well as the determination of indicators of the influence of physical factors such as water demand, bleeding, pozzolanic activity, the heat of hydration on the set of properties of paste and concrete: workability, standard, and early strength, global warming potential, allows to obtain technologically optimized multi-component Portland cements. The results showed that the production of multi-component Portland cement with high early strength CEM II/B-M 42.5 R-LH ensures separate grinding of individual constituents, optimization of grain composition of slag, superzeolite, and limestone powder taking into account the PSD by surface area.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"7 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89241981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.2.5
W. Kurdowski, Ernest Jelito
Short rotary kilns with cyclone heat exchangers are commonly used in current cement industry. The principle is the installation of precalciner, even in the case of kilns with low capacity, not exceeding 3000 tons per day. The best method of tertiary air introducing is the usage of separate duct from grate cooler, which justifi es widespread use of these coolers. Alternative fuels, as whole tires, can be burned in precalciners, on special furnaces.
{"title":"Rotary kilns in current cement industry","authors":"W. Kurdowski, Ernest Jelito","doi":"10.32047/cwb.2020.25.2.5","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.2.5","url":null,"abstract":"Short rotary kilns with cyclone heat exchangers are commonly used in current cement industry. The principle is the installation of precalciner, even in the case of kilns with low capacity, not exceeding 3000 tons per day. The best method of tertiary air introducing is the usage of separate duct from grate cooler, which justifi es widespread use of these coolers. Alternative fuels, as whole tires, can be burned in precalciners, on special furnaces.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"159 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73561397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.4.1
M. Bugdol, B. Goranczewski, Grzegorz Kądzielawski, Grzegorz Pakuła
The paper discusses the results of research on the maturity of the quality management system, implemented in selected organizations operating in the construction industry in terms of the possibility of introducing the concept of lean construction. Multiple studies have indicated the potential benefits which organizations may gain by applying lean principles, e.g. decreased costs, reduced construction time, and wastefulness. The aim of this paper is to develop a proposition – main tasks, of implementing the lean construction concept based on normalized quality management systems, in organizations operating in the construction industry. The research was carried out using documentation analysis, interviews, and a self-assessment method, consistent with ISO 9004. Its results confirm earlier findings e.g. (1, 2), according to which quality management systems may serve as the foundation for implementation of lean construction. However, it is vital to take the specific nature of the construction business into account, especially the fact that the construction works are connected with particular sources of wastefulness (3).
{"title":"The proposition of implementing the lean construction concept based on normalized quality management systems in the organizations operating in the construction industry","authors":"M. Bugdol, B. Goranczewski, Grzegorz Kądzielawski, Grzegorz Pakuła","doi":"10.32047/cwb.2020.25.4.1","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.4.1","url":null,"abstract":"The paper discusses the results of research on the maturity of the quality management system, implemented in selected organizations operating in the construction industry in terms of the possibility of introducing the concept of lean construction. Multiple studies have indicated the potential benefits which organizations may gain by applying lean principles, e.g. decreased costs, reduced construction time, and wastefulness. The aim of this paper is to develop a proposition – main tasks, of implementing the lean construction concept based on normalized quality management systems, in organizations operating in the construction industry. The research was carried out using documentation analysis, interviews, and a self-assessment method, consistent with ISO 9004. Its results confirm earlier findings e.g. (1, 2), according to which quality management systems may serve as the foundation for implementation of lean construction. However, it is vital to take the specific nature of the construction business into account, especially the fact that the construction works are connected with particular sources of wastefulness (3).","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"184 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77305439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/CWB.2020.25.3.2
R. Cheraghalizadeh, T. Akçaoğlu
Reasonable and standardized use of local and waste resources is of great importance for the economic development in the world. The utilization of waste materials can result in enhanced properties and eco-friendly concrete, at the same time. In this study, it is aimed to evaluate the effect of olive waste ash on the mechanical and fracture properties of self-compacting concrete. For this purpose, self-compacting concrete mixes were prepared by the utilization of olive waste ash, in three different proportions and with two different dosages of superplasticizer. Alongside compressive and tensile strengths analysis, a series of three-point bending tests on notched beams were conducted for all mixes. Moreover, initial defects of all self-compacting mixes were evaluated by using the X-ray computed tomography method. Findings showed that using olive waste ash in self-compacting concrete mainly affects the tensile strength and fracture energy for the two different contents of superplasticizer.
{"title":"Properties of self-compacting concrete containing olive waste ash","authors":"R. Cheraghalizadeh, T. Akçaoğlu","doi":"10.32047/CWB.2020.25.3.2","DOIUrl":"https://doi.org/10.32047/CWB.2020.25.3.2","url":null,"abstract":"Reasonable and standardized use of local and waste resources is of great importance for the economic development in the world. The utilization of waste materials can result in enhanced properties and eco-friendly concrete, at the same time. In this study, it is aimed to evaluate the effect of olive waste ash on the mechanical and fracture properties of self-compacting concrete. For this purpose, self-compacting concrete mixes were prepared by the utilization of olive waste ash, in three different proportions and with two different dosages of superplasticizer. Alongside compressive and tensile strengths analysis, a series of three-point bending tests on notched beams were conducted for all mixes. Moreover, initial defects of all self-compacting mixes were evaluated by using the X-ray computed tomography method. Findings showed that using olive waste ash in self-compacting concrete mainly affects the tensile strength and fracture energy for the two different contents of superplasticizer.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"22 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81577471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.2.6
Selahattin Güzelküçük, I. Demir, Özer Sevim, I. Kalkan
Sulfates are a significant chemical components that may lead to failures of cement concrete composites. The present study is dedicated to analyzing the effects of sulfate on the microstructure of cement composite mortars. For this purpose, cementing composite specimens were prepared with 20% pozzolan mixture [fly ash + granulated blastfurnace slag + bottom ash] by mass of cement, together with the reference additive-free specimen of cement concrete, without any mineral admixtures. These cementing composite mortar specimens were then treated for 2, 7, 28, 90, and 360 days in tap water and 10% sodium sulfate solution. The microstructure of the additive-free mortar and composite cement mortar, partially replaced with 20% pozzolan, was then investigated using a scanning electron microscope. The results showed that increasing curing time also increases the formation of C-S-H [calcium silicate hydrate] gel in the cement mortar, when the microstructural changes in the cement are explored in detail. Ettringite formation [3CaO·Al2O3·3CaSO4·32H2O] in the specimens cured in 10% Na2SO4 was also noticed, in the present experiments.
{"title":"Mechanical properties and microstructure of cement multicomponent systems containing pozzolan materials under sulfate attack","authors":"Selahattin Güzelküçük, I. Demir, Özer Sevim, I. Kalkan","doi":"10.32047/cwb.2020.25.2.6","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.2.6","url":null,"abstract":"Sulfates are a significant chemical components that may lead to failures of cement concrete composites. The present study is dedicated to analyzing the effects of sulfate on the microstructure of cement composite mortars. For this purpose, cementing composite specimens were prepared with 20% pozzolan mixture [fly ash + granulated blastfurnace slag + bottom ash] by mass of cement, together with the reference additive-free specimen of cement concrete, without any mineral admixtures. These cementing composite mortar specimens were then treated for 2, 7, 28, 90, and 360 days in tap water and 10% sodium sulfate solution. The microstructure of the additive-free mortar and composite cement mortar, partially replaced with 20% pozzolan, was then investigated using a scanning electron microscope. The results showed that increasing curing time also increases the formation of C-S-H [calcium silicate hydrate] gel in the cement mortar, when the microstructural changes in the cement are explored in detail. Ettringite formation [3CaO·Al2O3·3CaSO4·32H2O] in the specimens cured in 10% Na2SO4 was also noticed, in the present experiments.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"7 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74877349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.1.4
J. Łapińska, Iwona Escher, Grzegorz Kądzielawski, P. Brzustewicz
The article uses the linear ordering method, which falls under the multi-dimensional comparative analysis methods, to assess the scope of activities for sustainable development carried out by cement industry companies operating in Poland. This assessment was based on the structure of the synthetic measure [Qi], which included three diagnostic variables: (i) the scope of environmental and social activities communicated by the company, (ii) the number of published reports in CSRinfo, (iii) company size measured by its market share. The analysis allowed for the identifi cation of leaders in the fi eld of communicated activities that are part of the activities undertaken for sustainable development. They are primarily the largest entities of the cement industry in Poland, which are part of global capital groups.
{"title":"Assessment of the scope of activities for sustainable development in the cement industry in Poland with the use of multi-dimensional comparative analysis","authors":"J. Łapińska, Iwona Escher, Grzegorz Kądzielawski, P. Brzustewicz","doi":"10.32047/cwb.2020.25.1.4","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.1.4","url":null,"abstract":"The article uses the linear ordering method, which falls under the multi-dimensional comparative analysis methods, to assess the scope of activities for sustainable development carried out by cement industry companies operating in Poland. This assessment was based on the structure of the synthetic measure [Qi], which included three diagnostic variables: (i) the scope of environmental and social activities communicated by the company, (ii) the number of published reports in CSRinfo, (iii) company size measured by its market share. The analysis allowed for the identifi cation of leaders in the fi eld of communicated activities that are part of the activities undertaken for sustainable development. They are primarily the largest entities of the cement industry in Poland, which are part of global capital groups.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"27 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74524359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.4.3
N. Arivusudar, S. Suresh Babu
Engineered Cementitious Composites are generally the ultra-high—performance fiber-reinforced composites, which have very good mechanical properties. Engineered Cementitious Composites are similar to normal conventional concrete with cement, fi ne sand, fly ash, but without coarse aggregate. Engineered Cementitious Composites have a high content of cement, which is causing this material to be far from the sustainability. The mechanical and durability properties of Engineered Cementitious Composites can be improved by the addition of fly ash. The properties of Engineered Cementitious Composites can be also improved by the partial replacement of cement by fly ash, up to 40%. In this study, an attempt is made to straighten the Engineered Cementitious Composites by the addition of silica fume, leaving the content of fly ash without changes. Eight different mix proportions are used in this investigation, which includes one conventional mix and mixes with the addition of 10% to 70% of silica fume with the distance of 10%. The addition of silica fume to Engineered Cementitious Composites is causing the remarkable improvement of the mechanical properties of these mixes.
{"title":"Mechanical properties of engineered cementitious composites developed with silica fume","authors":"N. Arivusudar, S. Suresh Babu","doi":"10.32047/cwb.2020.25.4.3","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.4.3","url":null,"abstract":"Engineered Cementitious Composites are generally the ultra-high—performance fiber-reinforced composites, which have very good mechanical properties. Engineered Cementitious Composites are similar to normal conventional concrete with cement, fi ne sand, fly ash, but without coarse aggregate. Engineered Cementitious Composites have a high content of cement, which is causing this material to be far from the sustainability. The mechanical and durability properties of Engineered Cementitious Composites can be improved by the addition of fly ash. The properties of Engineered Cementitious Composites can be also improved by the partial replacement of cement by fly ash, up to 40%. In this study, an attempt is made to straighten the Engineered Cementitious Composites by the addition of silica fume, leaving the content of fly ash without changes. Eight different mix proportions are used in this investigation, which includes one conventional mix and mixes with the addition of 10% to 70% of silica fume with the distance of 10%. The addition of silica fume to Engineered Cementitious Composites is causing the remarkable improvement of the mechanical properties of these mixes.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"77 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89830716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effect of fly ash, rice husk ash, metakaolin, ultra-fine slag on the packing density of ternary mix was studied in this paper, using Puntke’s method of particle packing. The addition of these mineral additives, whose particle size is lower than that of the Ordinary Portland Cement, improves the packing density of cement, by filling the voids between the cement grains, which results in increased compressive strength of concrete. The main aim of this research was to increase the packing density by replacement of cement with fine materials. Cement replacement was carried out from 10% to 40% in steps of 5%. Many combinations were tested and results showed that a maximum packing density of 0.586 was achieved at 75% cement content along with fl y ash and ultra-fine slag, without addition of the superplasticizer. Addition of superplasticizer further increased the packing at lower water to binder ratio.
{"title":"Influence of mineral additives on the packing density of ternary mix","authors":"Akanksha Pathania, Abhilash Shukla, Rajneesh Vashisht","doi":"10.32047/cwb.2020.25.2.7","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.2.7","url":null,"abstract":"The effect of fly ash, rice husk ash, metakaolin, ultra-fine slag on the packing density of ternary mix was studied in this paper, using Puntke’s method of particle packing. The addition of these mineral additives, whose particle size is lower than that of the Ordinary Portland Cement, improves the packing density of cement, by filling the voids between the cement grains, which results in increased compressive strength of concrete. The main aim of this research was to increase the packing density by replacement of cement with fine materials. Cement replacement was carried out from 10% to 40% in steps of 5%. Many combinations were tested and results showed that a maximum packing density of 0.586 was achieved at 75% cement content along with fl y ash and ultra-fine slag, without addition of the superplasticizer. Addition of superplasticizer further increased the packing at lower water to binder ratio.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"222 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77429871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32047/cwb.2020.25.3.4
Hanna Y. Ghorab, H. Hassan, Hosam El D.H. Ahmed
This study is concerned with the method of cast earth as part of an investigation series on earth construction. The effect of two clay swelling inhibitors; polyethylene glycol [PEG] and of carboxymethyl cellulose [CMC] on the swelling of a clay-bearing soil are studied to enable the stabilization of the soil with CEM I 42.5 N. The soil composed of 14% clay, quartz, and calcite, is stabilized with 10% cement. 3% polycarboxylate superplasticizer is added relative to the mass of the cement, to gain the soil pourable properties. The results show that the PEG and CMC clay-swelling inhibitors reduce the expansion of the soil by ~30 and ~40% and lead to a maximum increase of 24 and 46% in the 90-day compressive strength respectively. The interactions between clay, cement, and swelling inhibitors are discussed. The findings allow advantageous applications for producing building units for construction purposes in desert areas.
本研究是关于浇筑土的方法，作为土方施工系列调查的一部分。两种粘土溶胀抑制剂的效果;研究了聚乙二醇(PEG)和羧甲基纤维素(CMC)对含粘土土壤膨胀的影响，以CEM I 42.5 n稳定土壤。土壤由14%的粘土、石英和方解石组成，用10%的水泥稳定。相对于水泥质量加入3%聚羧酸型高效减水剂，以获得土壤的可浇注性能。结果表明，PEG和CMC阻缩剂分别使土体膨胀率降低了30%和40%，最大抗压强度分别提高了24%和46%。讨论了粘土、水泥和膨胀抑制剂之间的相互作用。这一发现为在沙漠地区生产建筑单元提供了有利的应用。
{"title":"Stabilization of the swelling soil for earth construction","authors":"Hanna Y. Ghorab, H. Hassan, Hosam El D.H. Ahmed","doi":"10.32047/cwb.2020.25.3.4","DOIUrl":"https://doi.org/10.32047/cwb.2020.25.3.4","url":null,"abstract":"This study is concerned with the method of cast earth as part of an investigation series on earth construction. The effect of two clay swelling inhibitors; polyethylene glycol [PEG] and of carboxymethyl cellulose [CMC] on the swelling of a clay-bearing soil are studied to enable the stabilization of the soil with CEM I 42.5 N. The soil composed of 14% clay, quartz, and calcite, is stabilized with 10% cement. 3% polycarboxylate superplasticizer is added relative to the mass of the cement, to gain the soil pourable properties. The results show that the PEG and CMC clay-swelling inhibitors reduce the expansion of the soil by ~30 and ~40% and lead to a maximum increase of 24 and 46% in the 90-day compressive strength respectively. The interactions between clay, cement, and swelling inhibitors are discussed. The findings allow advantageous applications for producing building units for construction purposes in desert areas.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78247736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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