Impact of relative humidity on strength and microscopic pore structure of air lime-stabilized compressed earth

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-06-26 DOI:10.1617/s11527-024-02411-0

Yi Luo, Jieting Xu, Yongwei Huang, Pengpeng Ni, Wentao Li

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Abstract

To investigate the impact of relative humidity on the mechanical properties and microscopic pore structure of air lime-stabilized compressed earth, unconfined compression strength (UCS), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) tests were conducted by varying the air lime content and relative humidity (RH) in compressed earth. The results revealed three typical failure modes in unconfined compression strength tests of lime-stabilized compressed earth. Both the unconfined compression strength and characteristic parameters of pore structure in lime-stabilized compressed earth exhibited a trend of initial increase, following by a decrease as the air lime content and relative humidity increased. At the microscopic level, the relative humidity and air lime content interacted with the changes in macro-level unconfined compression strength, and the increase of both could promote the lime hydration reactions, inhibiting the crack development. Considering the influence of relative humidity, mechanical performance, and economic benefit improvement, the recommended air lime content for high humidity and low humidity were 0–28% and 0–26%, respectively, offering valuable insights for the optimization and application of lime-stabilized compressed earth as a modern construction material for structural walls.

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相对湿度对气态石灰稳定压缩土强度和微观孔隙结构的影响

为了研究相对湿度对气态石灰稳定压缩土的力学性能和微观孔隙结构的影响，我们通过改变压缩土中的气态石灰含量和相对湿度（RH），进行了无约束压缩强度（UCS）、汞侵入孔隙模拟（MIP）和扫描电子显微镜（SEM）试验。结果表明，在石灰稳定压缩土的无侧限压缩强度试验中存在三种典型的破坏模式。随着石灰含量和相对湿度的增加，石灰稳定压缩土的无侧限压缩强度和孔隙结构特征参数都呈现出先上升后下降的趋势。在微观层面上，相对湿度和空气石灰含量与宏观无侧限压缩强度的变化相互影响，二者的增加可促进石灰的水化反应，抑制裂缝的发展。考虑到相对湿度、力学性能和经济效益的影响，高湿度和低湿度下推荐的空气石灰含量分别为 0-28% 和 0-26%，这为优化和应用石灰稳定压缩土这种现代结构墙体建筑材料提供了宝贵的启示。

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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.