有机-无机复合型防水剂对砂浆性能的影响及机理分析

The influence of organic-inorganic composite waterproofing agent on the performance of mortar and its mechanism analysis

研究了不同掺量有机-无机复合型防水剂对基准砂浆抗渗性能和吸水性能的影响,以及在最优掺量下对不同强度等级抹灰砂浆力学性能和抗渗性能的影响,利用压汞试验和扫描电镜等分析了砂浆的防水性能提高的作用机理。结果表明:防水剂的最优掺量为5%,对应的基准砂浆吸水量比为49%、透水压力比为325%,同时抹灰砂浆的抗压强度比均大于105%、抗渗性能至少提高2个等级。机理分析表明,防水剂主要是促进了更多的水化硅酸钙凝胶体和Ca(OH)_(2)的生成,填充材料的孔隙,增大了基材的密实度,进而显著降低孔隙率、窄化了孔结构,在改善砂浆防水性能的同时力学性能也得到显著提高。

The influence of organic-inorganic composite waterproofing agent on the impermeability and water absorption performance of the benchmark mortar under different dosages and the influence on the mechanical properties and impermeability of the plaster mortar under the optimal dosage were studied.In addition,the mercury intrusion test(MIP)was used and Scanning Electron Microscope(SEM)and other technical means have analyzed the mechanism on improving the waterproof performance of mortar.The results show that:the optimal amount of waterproofing agent is 5%,the corresponding standard mortar water absorption ratio is 49%,and the water penetration pressure ratio is 325%.At the same time,the compressive strength ratio of the plaster mortar is greater than 105%,and the impermeability is also increased by at least 2 levels.The mechanism analysis shows that the waterproofing agent mainly promotes more hydrated calcium silicate gel and the generation of Ca(OH)_(2) fills the pores of the material and increases the density of the substrate,which significantly reduces the porosity and narrows the pore structure.While improving the waterproof performance of the mortar,the mechanical properties are also significantly improved.