Recent content by Cassie

It will shrink if the cement content is too high. However, I guess adding too much cement to the wet-mixed mortar is impossible since the cost cannot bear it. It may be that you using too much retarder.

Stirring for 60S, the density becomes larger, proving that the admixture's effect has yet to be brought into play during the first 30S of stirring. You can stir for a few more minutes to see if the density has changed.

The biggest advantage of wet-mixed mortar is low cost, and the biggest disadvantage is the problem of storage and quality stability.

1. Brush the base with a wire brush. Curing in water for one day before forming. During the experiment, take it out and dry it in advance. 2. When forming, oil the frame's inner wall to facilitate demoulding. 3. The demoulding process must be careful; Redo it if the mortar moves relative to...

First, the sand is too fine; second, moisture inside is not kept and it is easy to dry. Add some water-retaining agent and thickener will be better.

Adding an air-entraining agent improves construction and reduces bulk density. The air loss is evident after 2 hours. I have also encountered a similar situation. The cohesion of the mortar may not be good enough. Add some Redispersible Polymer powder and increase the amount of water-reducing...

It should be caused by active stone powder in the bottom cement mortar. Generally, the active matter will burst into dust after meeting with water in the later stage.

The ratio is one side, and the admixture must also be adjusted. In addition, it is also necessary to check whether there are any problems in the construction. If you want to deal with it, consider all aspects.