苯丙共聚乳胶粉水泥砂浆的性能研究

Study on Properties of Styrene-Acrylate Copolymer Powder Modified Cement Mortar

研究了苯乙烯-丙烯酸丁酯共聚物乳胶粉（简称苯丙共聚乳胶粉或SAE乳胶粉）改性水泥砂浆的减水性、引气性、保水性、力学强度等物理性能.研究表明：SAE乳胶粉具有一定的减水作用,在同一流动度下,水泥砂浆用水量随SAE乳胶粉掺量增加而降低;SAE乳胶粉的掺入可在新拌水泥砂浆中引入9.8%～13.0%的含气量;水泥砂浆在新拌阶段以及硬化阶段的保水能力随SAE乳胶粉的掺入可显著改善;SAE乳胶粉明显提高了水泥砂浆的抗折和黏结抗拉强度,降低了水泥砂浆的抗压强度,从而改善了水泥砂浆的柔韧性并提高了水泥砂浆-混凝土以及砂浆-EPS板系统的界面区黏结抗拉强度.

The water-reducing performance, air entrainment, water retention, mechanical behavior of styrene-acrylate copolymer redispersible powder modified cement mortar with different polymer content were investigated. The research shows that the redispersible powder has a water-reducing role. The amount of water in the mortar decreases with increasing redispersible powder content when the flow value of fresh mortar is fixed. In the redispersible powder modified mortar, a proper quantity of air between 9.8% and 13% is entrained into cement mortar. Redispersible powder modified mortar has a markedly improved water retention over ordinary cement mortar both in fresh and hardened stage. A noticeable increase in flexural strength and adhesion but no improvement in compressive strength are shown in the redispersible powder modified mortar compared with ordinary cement mortar. Thus, the flexibility of ordinary cement mortar has been improved, meanwhile, the interface bond tensile strength of mortar-concrete and mortar-EPS board system has also been enhanced.