Long-term residence of the house, the wall will inevitably appear cracks or peeling. But do you know who's behind this? The answer is-cement mortar shrinks! Including chemical shrinkage, drying shrinkage, self-shrinkage, temperature shrinkage and plastic shrinkage, each of which has its own uniqueness.

Chemical shrinkage

Chemical shrinkage, that is, hydration shrinkage, is like cement and water playing together, and then hydration produces hydration heat, which leads to volume reduction. This is like a magical reaction between water and cement, but the space between them forms capillary holes, which affects the performance of mortar.

air shrinkage

Dry shrinkage refers to the gradual evaporation of water inside the mortar after plastering stops, resulting in a decrease in volume. It's like the wall of your house is quietly slimming, but if it is too thin, it will crack!

Self-contraction

Self-shrinkage means that after the initial setting of mortar, cement continues to hydrate, resulting in volume reduction. It's like a wall repairing itself, but sometimes it will crack if it is repaired too much.

Temperature contraction

Temperature shrinkage, also known as cold shrinkage, is caused by the hydration temperature of cement in lime slurry rising and then cooling to room temperature. It's like the wall has experienced a hot summer and a cold winter, which expands with heat and contracts with cold, leading to cracking.

Plastic shrinkage

Plastic shrinkage means that the evaporation rate of water on the surface of lime mortar before hardening is higher than the internal infiltration rate, which leads to surface shrinkage. It's like losing weight in a hurry before your wall is completely strong, which leads to cracks.