摘要
含水率的周期性变化是引起土遗址劣化的关键内在因素,粉黏土质为主的土遗址尤为显著.为了减缓水对开封州桥遗址的不利影响,结合州桥遗址的开挖情况、赋存环境以及病害特征,基于疏水原理和碳化反应,选用硅酸盐有机硅防水剂,以防水剂浓度和碳化时间为因素,通过毛细吸水实验、浸水崩解实验及扫描电镜测试探究改善效果.结果表明:防水剂浓度和碳化时间对改善遗址土的水理性质有重要影响,浓度8%的防水剂可有效提高遗址土的水理性质,碳化12 h遗址土试样的毛细吸水量和崩解率最小.防水剂分子在土颗粒表面与二氧化碳发生反应,形成疏水膜,提高土颗粒的疏水特性,改善遗址土的水理性质.研究内容为减缓粉黏土质类遗址的水劣化病害提供了借鉴.
The periodic change of water content is the key internal factor causing the deterioration of soil sites,especially the soil sites dominated by silty clay.To slow down the bridge site of kaifeng state water,combined with state of the excavation of the site of the bridge,store environment and disease characteristics,and on the basis of the principle of hydrophobic carbonization reaction,silicate organosilicon waterproofing agent was chosen,using water concentration and carbonization time as factors,through capillary water absorption test,soak disintegration experiment and scanning electron microscopy test to explore the improvement effect.The results showed that the concentration of water-repellent and carbonization time had an important effect on improving the hydrodynamic properties of the site soil,and 8%water-repellent concentration could effectively improve the hydrodynamic properties of the site soil,and the capillary water absorption capacity and disintegration rate of the site soil samples after carbonization for 12hwere the lowest.Water-repellent molecules react with carbon dioxide on the surface of soil particles to form a hydrophobic film,which improves the hydrophobic properties of soil particles and improves the hydrologic properties of the site soil.The study provides reference for mitigating water degradation of silty clay sites.
作者
赵丽敏
朱耀冬
黎鹏
孙琪
ZHAO Limin;ZHU Yaodong;LI Peng;SUN Qi(School of Civil Engineering and Architecture,Henan University,Henan Kaifeng 475004,China;Yellow River Civilization and Sustainable Development Research Center and Collaborative Innovation Center of Yellow River Civilization of Henan University,Henan Kaifeng 475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2023年第3期367-378,共12页
Journal of Henan University:Natural Science
基金
河南省科技攻关项目(212102310287,212102310271)
关键词
遗址土
水理性质
碳化反应
疏水作用
抑制病害
site soil
water physical property
carologic proprbonization reaction
hydrophobic action
inhibition of disease
