聚合物干粉改性水泥砂浆性能及应用研究

研究了掺羟乙基甲基纤维素醚和乙烯-醋酸乙烯酯共聚物乳胶粉的改性水泥砂浆的各项物理性能及其断面形貌。试验结果表明,2种聚合物均具有很好的保水功能,能使砂浆的水分更多、更长时间地保留在水泥浆体中,从而保证了水泥砂浆的充分水化,减少了浆体的分层离析现象,使砂浆具有良好的施工和易性;聚合物的引气功能,使新拌水泥砂浆的体积密度下降,且引入的空气在硬化砂浆中形成孔径小且分布均匀的微孔,因而改性砂浆的抗吸水能力提高;聚合物的种类、掺量对砂浆的各项性能有很大的影响,复掺能充分发挥不同聚合物对砂浆的改性作用,且聚合物间存在一个合适的掺量范围。聚合物改性水泥砂浆适合商品化生产,通过改变聚合物的掺量可满足现代施工对砂浆不同功能的需求。

Research on Physical Properties of Polymers Modified Cement Mortars and Their Commercial Application

The paper delivered the physical properties and fracture morphology of cement mortars modified by two kinds of polymer powder.Test results showed that,both hydroxyethyl methyl cellulose(M) and vinyl co-polymer(D) could make cement mortars possess excellent water retention,and only very small additions were required for this purpose,thus enhancing workability and ensuring that the water remained present for uniform setting and hardening.The air incorporated by M or D can efficiently improve pore structure of hardened mortars,thus the modified mortars were of lower capillary water adsorption.The additions of the M and D should be in certain scope.Polymer modified cement mortars were suitable to be produced as dry-mixed mortars in plants,and their different additions of polymer can meet the different requirements to certain types of modern construction.