【作者】 谢石； 陈晓杰； 商程宇； 张超； 李帅；

【Author】 XIE Shi;CHEN Xiaojie;SHANG Chengyu;ZHANG Chao;LI Shuai;Power China Roadbridge Group Co., Ltd.;University of Science and Technology Beijing;

【机构】 中电建路桥集团有限公司； 北京科技大学；

【摘要】 泡沫轻质混凝土的渗透系数是决定其耐久性的一个重要因素,且考虑围压水平的泡沫混凝土渗透特性研究较少。基于此以普通硅酸盐水泥、粉煤灰、发泡剂、水为原材料通过物理发泡技术制备泡沫轻质混凝土,选用GDS三轴试验系统中的渗透模块进行受荷渗透试验,精确测量不同密度、不同围压水平下渗透系数大小,研究试样渗透系数随着密度等级和围压水平变化的规律,并提出了试样渗透系数与围压的函数关系。试验结果表明:泡沫轻质混凝土渗透系数分布在10^-8,10^-9m/s两个数量级上,并随着密度等级的提高而减小,围压水平的降低而增大,且试样渗透系数与围压呈幂函数关系,拟合度较高。更多还原

【Abstract】 Permeability is one of the most important factors which affect foamed lightweight concrete durability, and there are few studies on the permeability of foamed concrete considering the confining pressure level. In this study, ordinary portland cement, fly ash, foaming agent and water were used as raw materials to prepare foamed lightweight concrete by physical foaming technology. The permeation module in the GDS triaxial test system was used for the loading and penetration experiment, the permeability coefficients at different density and confining pressure levels were measured accurately, the law of the permeability coefficient of samples changing with density grade and confining pressure level was studied, and the relationship between the permeability coefficient of the sample and the confining pressure was proposed. The experimental results showed that the permeability coefficient of foam lightweight concrete was distributed on the order of 10-8、10-9 m/s, the permeability coefficient of foamed lightweight concrete decreased with the increase of density grade, and increased with the decrease of confining pressure level, the permeability coefficient of the sample and the confining pressure were in a power function relationship, and the fitting degree was higher.更多还原