Hydromechanical performances and durability of compressed earth blocks stabilised with metakaolin-based geopolymer binder

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-08-21 DOI:10.1617/s11527-024-02446-3

Kader Banaou Djibo, Seick Omar Sore, Philbert Nshimiyimana, David Yao Akodenyon, Adamah Messan

{"title":"Hydromechanical performances and durability of compressed earth blocks stabilised with metakaolin-based geopolymer binder","authors":"Kader Banaou Djibo, Seick Omar Sore, Philbert Nshimiyimana, David Yao Akodenyon, Adamah Messan","doi":"10.1617/s11527-024-02446-3","DOIUrl":null,"url":null,"abstract":"<div><p>Demographic growth and the need for housing remain significant issues. Compressed earth bricks (CEB) are appropriate materials due to their availability and thermal properties, but different considerations hinder their adoption. The influence of water on the mechanical properties and durability of CEBs stabilised with an alkali-activated geopolymer binder has yet to be thoroughly investigated. Thus, this study assessed the hydromechanical performance and durability of compressed earth bricks (CEBs) stabilised with an alkali-activated geopolymer binder. Dry mixes consisting of lateritic earth and 5—20% metakaolin (MK) binder, with respect to the dry mass of the earth, were prepared. A solution of NaOH at a concentration of 12 M was used to activate MK. The wet mixes were then statically compressed using a manual press at a stress of about 3.5 MPa. The dried CEBs were subjected to progressive mechanical characterisation after exposure to different water content and durability indicators assessment. A satisfactory mathematical correlation was established between the relative compressive strength and water content of the CEBs. CEBs stabilised with geopolymer binder showed increased stability to water, and their absorption capacity was relatively below the recommended 20% threshold. The abrasion resistance coefficient improved after the wetting–drying (W-D) cycles and was above the recommended 7 cm<sup>2</sup>/g.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":"57 7","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Structures","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1617/s11527-024-02446-3","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Demographic growth and the need for housing remain significant issues. Compressed earth bricks (CEB) are appropriate materials due to their availability and thermal properties, but different considerations hinder their adoption. The influence of water on the mechanical properties and durability of CEBs stabilised with an alkali-activated geopolymer binder has yet to be thoroughly investigated. Thus, this study assessed the hydromechanical performance and durability of compressed earth bricks (CEBs) stabilised with an alkali-activated geopolymer binder. Dry mixes consisting of lateritic earth and 5—20% metakaolin (MK) binder, with respect to the dry mass of the earth, were prepared. A solution of NaOH at a concentration of 12 M was used to activate MK. The wet mixes were then statically compressed using a manual press at a stress of about 3.5 MPa. The dried CEBs were subjected to progressive mechanical characterisation after exposure to different water content and durability indicators assessment. A satisfactory mathematical correlation was established between the relative compressive strength and water content of the CEBs. CEBs stabilised with geopolymer binder showed increased stability to water, and their absorption capacity was relatively below the recommended 20% threshold. The abrasion resistance coefficient improved after the wetting–drying (W-D) cycles and was above the recommended 7 cm²/g.

Abstract Image

查看原文本刊更多论文

使用偏高岭土基土工聚合物粘结剂加固的压缩土块的水力学性能和耐久性能

人口增长和住房需求仍然是重大问题。压缩土砖（CEB）因其可用性和热性能而成为合适的材料，但不同的考虑因素阻碍了其应用。水对使用碱活性土工聚合物粘结剂稳定的压缩土砖的机械性能和耐久性的影响还有待深入研究。因此，本研究对使用碱活性土工聚合物粘结剂稳定的压缩土砖（CEBs）的水力学性能和耐久性进行了评估。研究人员制备了由红土和占红土干质量 5-20% 的偏高岭土（MK）粘结剂组成的干混合物。用浓度为 12 M 的 NaOH 溶液对 MK 进行活化。然后使用手动压力机对湿混合物进行静态压缩，应力约为 3.5 兆帕。干燥后的行政首长协调会在暴露于不同含水量和耐久性指标评估后接受渐进式机械特性分析。结果表明，在土工织物的相对抗压强度和含水量之间建立了令人满意的数学相关性。使用土工聚合物粘结剂稳定的建筑结构对水的稳定性有所提高，其吸水能力相对低于建议的 20% 临界值。耐磨系数在湿润-干燥（W-D）循环后有所提高，高于建议的 7 cm2/g。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.