普通砂浆和混凝土存在着泌水、离析、凝结时体积收缩等缺点,造成质量的下降。由于砂表面含水率不同或搅拌方法不同,对混凝土质量的影响也很大。例如用干砂拌制砂浆,在搅拌时,砂浆内就产生许多小气泡,继而产生明显的泌水现象,并在容器底部出现分离沉淀 Ordinary mortar and concrete have drawbacks such as bleeding, segregation, and volume shrinkage during condensation, resulting in a decrease in quality. Because of the different water content on the sand surface or the different mixing methods, the quality of the concrete is also greatly affected. For example, when mortar is mixed with dry sand, many small bubbles are generated in the mortar during stirring, and then obvious bleeding phenomenon occurs, and separation precipitation occurs at the bottom of the container.