水泥基土壤固化剂固化土的微观结构特征.pdf

第13卷第5期
建筑材料学报
2010年10月
TOURNAL OF BUILDING MATERIALS
ODet、,2010
文章编号:1007-9629(2010)05-0669-06
水泥基土壤固化剂固化土的微观结构特征
樊恒辉2,吴普特2,高建恩“,娄宗科
(1.西北农林科技大学水利与建筑工程学院,陕西杨凌712100;
2.中国科学院教育部水土保持与生态环境研究中心,陕西杨凌712100)
摘要:采用扫描电镜和能语分析测试手段,对水泥基土壤固化剂固化土的微观结构和固化剂的水
化产物进行了研究,结果表明:水泥基土壤固化剂水化产物包括水化硅酸钙(C-S-H)凝胶、氩氧化
钙、碳酸钙、三硫型水化硫铝酸钙(AF等物质,其中C-SH凝胶、AFt是构成固化土强度的主体
六方棱柱状的AFt晶体和纤维状的C-S-凝胶(「)纵横交替搭接成网状结构,插入或填充于土颗
粒孔隙之中;网络状或其他形状的C-S-H凝胶附着在土颗粒表面并将其包襄起来,或将相近的土
颗粒黏结起来,水泥基土壤固化剂水化产物的填充、挤密、黏结等作用,使呈松散状态的土颗粒逐
渐成为较致密的整体,从而改善了土体的工程技术性能
关键词:水泥基土壤固化剂;固土机理;徽观结构
中图分类号:TU472.5
文献标志码:A
doi:10.3969/j.issn.1007-9629.2010.05.021
Microstructure Characteristics of Soil Stabilized with
Cement-based Soil Stabilizer
FAN Heng-hui], WU Pu-tel2, GAO Jian-en=, LOU Zongke
(1. College of Water Conservancy and Architectural Engineering, Northwest A & F University, Yangling 712100, China
2. Research Centre of Soil and Water Conservation & Eco-environment, Chinese Academy of Sciences and
Education Ministry, Yangling 712100, China)
Abstract: Using the measurement methods of scanning electron microscope and energy spectrum, the microstruc-
ture characteristics of the soil stabilized with cement-based soil stabilizer and the hydration products were studied
The experimental results show that the hydration products include hydrated calcium silicate gel, calcium hydro-
xide, calcium carbonate, ettringite and so on. Hydrated calcium silicate gel and ettringite are principal components
for the strength of stabilized soils. The hexagonal prism ettringite and fibrous hydrated calcium silicate gel become
the reticulated structure to insert or fill in the pore between soil particle. The hydrated calcium silicate gel with
network and other shapes have attached on the soil particle to enwrap it or connect the soil particle. The loose soil
mass through the effect of fill and pack and cementation of hydration products of soil stabilizer acteristics of soil
particle has gradually turned to the more compact monolith that improves the engineering characteristics
Key words: cement-based soil stabilizer; mechanism of stabilized soil; microstructure
水泥基土壤固化剂是以硅酸盐水泥熟料及其他物理、化学等作用增强土颗粒之间的黏结力,提高土
活性材料为主,再配入各种激发剂而制成的,它通过壤的抗压强度、抗水性能和防裂性能.目前,土壤固
收稿日期:2009-06-16;修订日期:2009-11-12
基金项目:“十一蛋”国家科技支撑计划项目(2006BAD09B01,2006BAD11B03):国家自然科学基金资助项目(50979094);西北农林科技大
学青年学术骨干项目(08)
第一作者:樊恒辉(1973一),男,山西夏县人,西北农林科技大学副研究员,博士、主要从事特殊土的岩土工程性质及土性改良技术研究
Email:ssxxfhh@hotmail.com