摘要
为了改良泥岩的水稳定性并将风化泥岩用于路基填料,提出了用碱渣改性的方法。通过各种化学、物理及力学试验对改性前后泥岩的成分、膨胀性、力学特性、水理特性进行了对比分析,并初步分析了碱渣改性风化泥岩的微观机理。结果表明:碱渣改性后的泥岩自由膨胀率和50 kPa下膨胀变形率均有明显下降;碱渣改性后的泥岩土试样在满足95%压实度下的击实含水率与泥岩素土相比较宽,这为控制施工指标降低了难度;改性后泥岩抗压、抗剪强度均有显著增加,掺渣率为40%时达到顶峰;强度增加,是因为碱渣中的CaCO_3为改性后的泥岩土充当骨架,同时泥岩中的SiO_2与碱渣中提供的Ca(OH)_2发生反应,产生C-S-H胶凝材料;泥岩改性后试样接触角变大,由亲水性改为憎水性,提高了泥岩的拒水能力。
In order to improve the water stability of mudstone and apply weathered mudstone to subgrade filling,a method of modifying alkaline sludge was put forward.Through chemical,physical and mechanical tests,the composition,swelling property,mechanical properties and hydraulic properties of mudstone before and after modification were compared and analyzed,and the microcosmic mechanism of weathered mudstone modified by alkali residue was analyzed preliminarily.The results show that the deformation rate obviously decreased under 50 kPa.Expansion rate and expansion of the modified residue free mudstone;alkaline soil samples of modified mudstone after meet and mudstone compaction water content under 95%soil compaction compared to wide,this reduces the difficulty of construction control index;modified compression,mudstone the shear strength increased significantly,as the residue blending ratio reached a peak of 4 0%;the strength increases,because the CaCO3 residue as mudstone soil skeleton changed after,while providing SiO2 and residue in mudstone in the Ca(OH)2 reaction to produce C-S-H cementitious materials;modified mudstone sample contact angle becomes larger,from hydrophilic to hydrophobic,improve water repellent ability of mudstone.
作者
檀奥龙
魏连雨
王清洲
TAN Ao-long;WEI Lian-yu;WANG Qing-zhou(School of Civil Engineering and Transportation,Hebei University of technology,Tianjin 300401,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第8期2610-2615,共6页
Bulletin of the Chinese Ceramic Society
基金
河北省高等学校科学技术研究项目(ZD2014099)
关键词
风化泥岩
碱渣
改性
路基性能
化学反应
weathered mudstone
soda residue
modified
subgrade performance
chemical reaction
