摘要
针对水泥砂浆抗压强度低及抗渗性能差的问题,采用造纸废液主要成分——木质素磺酸钙为主要原料制备木质素系砂浆外加剂GCL1-M.水泥砂浆物理力学性能和微观结构测试结果表明,添加GCL1-M的砂浆减水率达到了30%,与未掺外加剂的砂浆相比,掺0.30%GCL1-M的硬化砂浆的28天抗压强度提高了20%,渗透压力提高了230%.氮吸附测试和电子扫描显微观测等结果表明,GCL1-M可减慢水泥的水化反应放热速度,降低砂浆的孔径,提高砂浆的抗渗性能.吸附性能及环境扫描电镜等测试结果表明,GCL1-M在水泥颗粒表面可形成网状结构吸附,同时可增加颗粒间的静电斥力位能,从而增强了对水泥砂浆的分散和保水作用,有利于提高砂浆的抗渗性能和抗压强度.
In order to improve the compressive strength and seepage resistance of cement mortar, the modified lig-nosulfonate additive GCL1-M was prepared, with the calcium lignosulfonate （CLS） from the black liquor of paper-making as the main material. The physical and mechanical properties as well as the microstructure of the mortar were then investigated. The results indicate that, with the addition of GCL1-M, the water-reducing ratio of the mortar reaches 30%, and the 28-day compressive strength and seepage pressure of the mortar with 0. 30% of GCL1-M are respectively raised by 20% and 230%. The nitrogen adsorption and SEM measurements show that the addition of GCL1-M decreases the heat-releasing rate of cement hydration and the pore size of the mortar, but increases the seepage resistance of the mortar. Moreover, the results of adsorption performance test and environmental scanning electron microscopy reveal that the GCL1-M may be absorbed on the cement surface in a network form. Thus, the static repelling force between cement particles increases and the dispersive and water-retention performances of GCL1-M on the mortar improve, which may result in the improvement of the seepage resistance and the compressive strength of the mortar.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期26-31,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省自然科学基金重点项目(05103536)
广东省科技计划项目(2006B14401006)
关键词
砂浆
木质素磺酸盐
抗渗
抗压强度
mortar
lignosulphonate
seepage resistance
compressive strength
