丁苯胶乳改性水泥基材料的性能与机理研究进展

 丁苯胶乳（SBL）改性水泥基材料具有较好的流动性、保水性、与基材的黏结性、水密性、耐久性、抗化学腐蚀性、抗冻融性、良好的力学强度及延伸性能，而且其成本较低、使用便捷，得到较为广泛的应用。综述了SBL改性水泥基材料的性能和机理，介绍了SBL单独改性、SBL和其他胶乳共混改性、SBL和纤维改性、SBL和外加剂复合改性时，水泥基材料的物理和力学性能。从3个方面探讨了SBL改性机理：SBL对水泥水化过程的影响存在物理作用和化学作用；SBL对微观结构的主要影响是由乳胶粒子的分散和聚合物薄膜的形成所产生的；从孔洞结构看，SBL改变水泥基材料的孔径分布、特征孔径、平均孔径、最可几孔径、孔隙率等，提高了材料的内聚强度。分析表明，SBL改性水泥基材料具有性价比高、环境友好、使用寿命长、循环利用率高等优点。

Progress of Research on Properties and Mechanism of SBL Modified Cement Based Materials

The styrene-butadiene latex (SBL) modified cement based materials have good mobility, water retention, cohesiveness to base material, water tightness, durability, resistance to chemical corrosion, freezing and thawing resistances, good mechanical strength and extension properties. They are low cost and easy to use, therefore, are becoming more widely used. In this paper, the mixed mode and mechanism research on SBL modified cement-based materials are reviewed; the physical and mechanical properties of cement-based materials are introduced for the SBL separate modification, SBL and other latex blending modification, the SBL and fiber modification, and the SBL and admixture modification, respectively. The modified mechanisms of the SBL are discussed from three aspects: the influence of SBL on cement hydration process is due to the interactions of physics and chemistry; the latex particle dispersion and the formation of polymer film are the major cause of the effect of SBL on the microstructure; SBL changes the pore diameter, average pore diameter, pore size distribution, the most probable aperture, and the porosity of the cement based material, increasing the cohesion strength of the material. Finally, the analysis indicates that the SBL modified cement-based materials are cost-effective and environment friendly, and have a long service life and recycling value.