乳胶粒径对聚合物改性水泥基材料性能的影响

发布时间：2018-12-12 09:06

【摘要】：合成了3种数均乳胶粒径分别为138,202,251nm的聚合物乳液,考查了乳胶粒径对聚合物在水泥表面吸附量、水泥净浆凝结时间、新拌砂浆流动度和含气量、硬化砂浆力学性能的影响.结果发现:在相同聚灰比(mP/mC)条件下,随乳胶粒径减小,聚合物在水泥表面的吸附量降低,水泥净浆的凝结时间变长,新拌砂浆流动度增大,硬化砂浆抗折强度提高,抗压强度下降;新拌砂浆含气量在mP/mC5%时随乳胶粒径减小而增大,在mP/mC≥5%时随乳胶粒径减小而减小;在饱和吸附量下单位质量水泥表面所吸附的3种聚合物覆盖面积与其粒径无关,分别为1 918,2 111,1 963cm2/g,比水泥的勃氏比表面积(3 530cm2/g)小.
[Abstract]:Three kinds of polymer emulsions with average emulsion size of 138202251nm were synthesized. The effects of emulsion particle size on the adsorption amount of polymer on cement surface, setting time of cement paste, flowability and air content of fresh mortar, and mechanical properties of hardened mortar were investigated. The results show that under the same mP/mC, with the decrease of latex particle size, the adsorption amount of polymer on cement surface decreases, the setting time of cement paste becomes longer, the flowability of fresh mortar increases, and the flexural strength of hardened mortar increases. The compressive strength decreases; The gas content of fresh mortar increases with the decrease of latex particle size at mP/mC5%, and decreases with the decrease of latex particle size at mP/mC 鈮，

本文编号：2374308