湿拌砂浆保塑时间与重塑的试验研究

关键字：湿拌砂浆,保塑时间,重塑

（1.广东省建筑材料研究院，广东 广州  510160；2.广东省硅酸盐学会，广东 广州  510160）

    摘要：保塑时间能体现湿拌砂浆的技术特点，对生产与应用更有指导意义。通过试验研究了湿拌砂浆在不同存放时间的各项性能，结果表明，湿拌砂浆稠度变化率小于30%，表观密度变化率小于5%时，湿拌砂浆可以保持较好的施工性能和浆体稳定性，如果此时湿拌砂浆抗压强度等力学性能指标满足砂浆设计标准要求，可以将此时的湿拌砂浆存放时间确定为保塑时间。重塑会导致砂浆抗压强度大幅下降，应当严格禁止湿拌砂浆的重塑。

Research on plasticity preservation time and re-plastic of wet-mixed mortar
YU Ligang1，2，LIAO Jinmei1，2，ZHENG Junsheng1
（1.Guangdong Building Materials Institute，Guangzhou 510160，China；2.Guangdong Ceramic Society，Guangzhou 510160，China）

    Abstract：Plasticity preservation time can reflect the technical characteristics of wet-mixed mortar，and have more guiding significance to the production and application. The experimental studies on each performance index of wet-mixed mortar have been done in different storage time. The results show that the wet-mixed mortar can maintain good construction performance and stability of slurry when the consistency change rate less than 30%，and the apparent density change rate is less than 5%，if the mechanical properties of met-mixed mortar such as compressive strength meet the requirement of mortar design standards，the wet-mixed mortar storage time at the moment can be sure to the plasticity preservation time. Re-plastic will lead to a substantial decline in the compressive strength of mortar，it should be strictly prohibited.
    Key words：wet-mixed mortar，plasticity preservation time，re-plastic