Degradation of rammed earth under soluble salts attack and drying-wetting cycles: The case of Fujian Tulou, China
Degradation of rammed earth under soluble salts attack and drying-wetting cycles: The case of Fujian Tulou, China
复制标题
可溶盐侵蚀和干湿循环下夯土的降解：以中国福建土楼为例
DOI：
10.1016/j.clay.2021.106202
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发表时间：
2021-10
影响因子：
5.6
通讯作者：
Junjie Ye
中科院分区：
文献类型：
--
作者：
Yi Luo;Peisong Zhou;Ni Pengpeng;Xingqian Peng;Junjie Ye
夯土是人类文明史上几千年来常见的建筑材料。夯土在盐侵蚀和干湿循环作用下的强度退化需要进行评估。在本研究中，对福建土楼拆除后不同墙高的夯土材料进行了化学分析，以测量其盐度。研究发现，岩壁的含盐量从顶部到底部逐渐增加。为了更好地了解盐的作用，将不同含量的氯化钠（NaCl）、硫酸钠（Na2SO4）和氯化钙（CaCl2）与脱盐土壤混合，制作重塑试样进行强度试验。无侧限抗压强度（qu）和黏聚力(c)随矿化度的增加而降低。单盐侵蚀对摩擦角φ和曲的影响不明显，但对粘聚力的影响较大。Na2SO4:CaCl2=1:1混合盐侵蚀土壤的qu和c值最低。来自CaCl2盐的Ca2+阳离子与来自Na2SO4的SO42 -阴离子反应形成晶体，体积增大，导致夯土材料强度下降。
Abstract Rammed earth is a common construction material for thousand years throughout the history of human civilization. The strength degradation of rammed earth under salts attack and drying-wetting cycles needs to be assessed. In this study, chemical analyses were conducted on rammed earth materials sampled at different wall heights from a demolished Fujian Tulou for the measurements of salinity. The degree of salinity was found to increase from the top to the bottom of the wall. To better understand the salt effect, sodium chloride (NaCl), sodium sulfate (Na2SO4), and calcium chloride (CaCl2) were mixed in various contents with desalinated soils to produce remoulded specimens for strength tests. The unconfined compressive strength (qu) and the cohesion (c) were reduced with the increase of the salinity degree. The influence of single salt attack was not apparent on the variation of qu or friction angle φ, but it was significant on the cohesion variation. The soil attacked by Na2SO4:CaCl2=1:1 mixed salt had the lowest qu and c values. The Ca2+ cations from CaCl2 salt reacted with the SO42− anions from Na2SO4 to form crystals with increasing volume, leading to strength deterioration in rammed earth materials.
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影响因子：
1.6
作者：
J. Tisdall;B. Cockroft;N. Uren
通讯作者：
J. Tisdall;B. Cockroft;N. Uren
DOI：
10.1108/ss-06-2013-0025
发表时间：
2014-07
期刊：
Structural Survey
影响因子：
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影响因子：
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作者：
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通讯作者：
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作者：
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