改性夯土墙材的强度影响因素相关性研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (4): 1286-1295.

改性夯土墙材的强度影响因素相关性研究

刘蕾^1,2, 姚勇^1,2, 张玲玲¹

1.西南科技大学土木工程与建筑学院,绵阳 621010;
2.工程材料与结构冲击振动四川省重点实验室,绵阳 621010

收稿日期:2020-12-26 修回日期:2021-01-26 出版日期:2021-04-15 发布日期:2021-05-11
通讯作者: 姚勇,博士,教授。E-mail:yy001221@163.com
作者简介:刘蕾(1997—),女,硕士研究生。主要从事新型建筑材料的研究。E-mail:kkepler@126.com
基金资助:
国家自然科学基金(51908476);西南科技大学研究生创新基金(20ycx049)

Correlation of Strength Influencing Factors of Modified Rammed Earth Wall Materials

LIU Lei^1,2, YAO Yong^1,2, ZHANG Lingling¹

1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, China

Received:2020-12-26 Revised:2021-01-26 Online:2021-04-15 Published:2021-05-11

摘要/Abstract

摘要： 夯土建筑是中国传统民居建筑的主要形式之一。它具有就地取材、冬暖夏凉、施工方便、能耗低、绿色环保等优点,应在美丽乡村建设中得到极大的传承和应用。但传统夯土墙材由素土构成,存在强度低、耐水性差等缺点,从而限制了其推广使用。以四川西北地区的素土为原料,选用水泥、砂、碎石、纤维、EFS(易孚森)土体稳定剂为改性材料制备改性夯土墙材,以期提高其抗压强度,并研究改性后各影响因素与抗压强度的相关程度,以及微观改性机理。结果表明,龄期、水泥掺量、砂及碎石总掺量、EFS掺量、纤维种类与抗压强度之间的偏相关系数依次为0.77、0.72、0.68、0.64、0.61。水泥、砂及碎石骨料、EFS土体稳定剂掺量的增加和龄期的增长,均有利于提高试件的抗压强度。通过XRD、IR、SEM分析可知,水泥水化反应产生的胶凝产物与土颗粒之间进行包裹、填充、连接,整体结构间孔隙率减少,形成更致密而稳定的微观结构,从而提高了改性材料的抗压强度。

关键词: 改性夯土, 夯土墙材, 抗压强度, 偏相关分析, 微观机理

Abstract: Rammed earth construction is one of the main forms of Chinese traditional local-style dwelling houses building. It has the advantages of locally-produced raw materials, warm in winter and cool in summer, convenient construction, low energy consumption, green environmental protection, and greatly inherited and applied in the construction of beautiful countryside. However, the traditional rammed earth wall material is composed of plain soil, and has some shortcomings such as low strength and poor water resistance, which limits its popularization and application. In order to improve the compressive bearing capacity of rammed earth wall materials, plain soil in the northwest Sichuan region was used as raw material and cement, sand, gravel, fiber and EFS soil stabilizer were used as modified materials. The correlation between the influence factors and compressive strength andmicrocosmic mechanism were studied. The results show that the partial correlation coefficients of age, cement content, total sand and gravel content, EFS soil stabilizer content, fiber type and compressive strength are 0.77, 0.72, 0.68, 0.64 and 0.61, respectively. The increase of cement, sand and gravel aggregate, EFS soil stabilizer content and the increase of age are conducive to improve the compressive strength of specimens. Through XRD, IR and SEM analysis, the cementing products produced by cement hydration reaction are wrapped, filled and connected with the soil particles, resulting in reduced porosity between the overall structures, forming a more compact and stable microstructure, and improving the compressive bearing capacity of the modified materials.

Key words: modified rammed earth, rammed earth wall material, compressive strength, partial correlation analysis, microcosmic mechanism

中图分类号:

TU521

刘蕾, 姚勇, 张玲玲. 改性夯土墙材的强度影响因素相关性研究[J]. 硅酸盐通报, 2021, 40(4): 1286-1295.

LIU Lei, YAO Yong, ZHANG Lingling. Correlation of Strength Influencing Factors of Modified Rammed Earth Wall Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1286-1295.

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