What is going on with the cement concrete surface bulging outward after construction

The reason for this: quicklime.

In the pouring process of stone and creatine, its hydration has not yet fully occurred, and after a long period of time, it slowly absorbs water, and gradually matures and expands about 2 times, causing the concrete to burst quickly. Activated silicon oxide reacts with the alkaline substance in the cement to generate continuous water absorption and expansion. The complex alkali-silicate gel expands by about 3 times in volume, and produces obvious expansion and cracking on the surface of the stone.

Solution: For the parts that have been swollen and cracked, use a drill to remove the existing parts. The area and depth of rejection should be 1-2cm larger than the area and depth of bursting, and the bursting aggregate, powder and the stones around the powder should be cleaned and chiseled together, and the second bursting phenomenon after repair can not occur due to the unclean chiseling.

Purge and clean the chiseled surface so that it is powder-free and regular, and use a wet closed-cell sponge (no open water.

Wipe the chisel surface. For the deeper parts (more than 2cm), first block a layer with 1:2 micro-expanded cement mortar, reserve 5-10mm on the surface, and then use polymer anti-cracking mortar after the micro-expanded mortar has a certain strength.

Scrape 3-8mm, and the last pass is 2mm thick structure white cement.

Putty scraped flat. For the shallower parts (within 2cm), polymer cement mortar can be used directly.

and white cement scraped flat. After 3-5 days after the above process is completed, the whole piece of paint is applied to the treated wall or ceiling. The color quality of the paint is consistent with the owner's requirements.

What is going on with the cement concrete surface bulging outward after constructionIt depends on whether it is a big drum or a small drum beat:

1. Small drum beats are generally caused by unqualified cement stability.

2. Big swelling, that is, there are things in the base that can produce bulging.

You check it and see what's going on. If there is any special reason, you can take a picture of ** and send it to help you see.

Summary. The difference between cement concrete pavement swelling and hollowing pavement swelling.

First, when the cement floor is laid, the cushion or base layer is not clean, and there is dust or foreign matter, especially if the white mortar sticks to it, it is not easy to clean up. This makes it difficult for the cushion and surface to be combined. Second, when the construction of the surface layer is carried out, the surface is not watered enough, the water is not sufficient, and the surface is too dry, which is one of the reasons.

Third, there is water on the surface of the cushion, before the construction of the surface layer, we must ensure that the water on the cushion is not there before the construction, otherwise it will also affect the adhesion of the surface layer and the cushion layer and cause the ground to be hollow.

The difference between cement concrete pavement swelling and hollowing.

The difference between cement concrete buried pavement swelling and hollow drum pavement swelling.

First, when the cement floor is laid, the cushion or base layer is not clean, and there is dust or foreign matter, especially if the white mortar sticks to it, it is not easy to clean up. This makes it difficult for the cushion and surface to be combined. Second, when the construction of the surface layer is carried out, the surface is not watered enough, the water is not sufficient, and the surface is too dry, which is one of the reasons.

Third, the surface of the cushion refers to the state of stagnant water, before the construction of the surface layer, we must ensure that the water on the cushion is not there before construction, otherwise it will also affect the adhesion of the surface layer and the cushion layer to cause the ground hollow.

The quality of the slag cushion is not good, if the slag cushion that has not been sieved and not boiled with water is used to mix cement slag to make the rotten cushion (or cement lime slag cushion layer), due to the slag cushion with too much powder, its own strength is low, easy to crack, resulting in hollowing of the ground.

The concrete pavement arches and cracks at the joints, and the concrete cracks in severe cases. Cause analysis (1) The expansion joint is blocked by sand and gravel and debris, which hinders the expansion of the plate. (2) The horizontal and vertical deviation of the force transmission rod set in the expansion joint is large, so that the expansion of the plate is blocked.

3) When the concrete slab with long expansion joint is prone to longitudinal instability in small curves, steep slopes and thin thickness, causing arch expansion. (4) The occurrence of arch expansion of long expansion joints is related to factors such as construction season, continuous paving length, and resistance between base and panel. Paving leaky concrete slabs on the old asphalt Xunsoupian pavement is more likely to swell.

5) Due to the presence of quicklime and unstable waste slag (such as steel slag) in the base layer, it will also cause the pavement to swell, but this swelling is not necessarily at the joints.