How to deal with cracks in concrete floor slab/cast-in-situ floor/slab crack
During concrete hardening, due to dehydration of concrete, causing shrinkage, or affected by temperature difference between high and low temperature, the influence of strong wind, causing cracks caused by uneven expansion and contraction, concrete crack repair treatment refers to the chemical method to repair concrete cracks Technology. Potassium Chlorate,High Purity Potassium Chlorate,Bulk Potassium Chlorate,General Potassium Chlorate Rucheng Sanxing Electric Chemical Co.,Ltd , https://www.3xchemical.com
Low pressure grouting technology
1. Automatic low pressure grouting device
The automatic low pressure grout is a pocket-sized new tool for automatic grouting of fine cracks in concrete.
The machine is novel and light in structure, with a length of 650px and a weight of only 110g. It does not require electricity. It is easy to operate and quick to construct. It can be installed in any direction, such as horizontal and vertical. In some special working surfaces (such as no power supply, obstacles, High altitude, wilderness) especially shows superiority. When grouting, several or dozens of them can be used together according to the length of the crack, and the resin is continuously injected, and the injection can be directly observed and confirmed by the naked eye.
Construction steps: 
1. Base treatment: remove dust and oil on the surface of the crack;
2. Determine the injection port: generally set an injection port according to the distance of 20 ~ 750px, the position of the injection port should be set as far as possible in the part where the crack is wide and the opening is smooth, and reserved;
3. Closed crack: use quick-drying sealing glue, apply scraping along the crack surface, leaving the injection port;
4. Install the plastic base: stick the base to the injection port with sealing glue;
5. Install the grouting device: After the sealing glue is solidified, the filled grouting resin is sucked into the grouting device, and the resin-filled grout is screwed on the base;
6. Grouting: Loosen the grout spring to confirm the injection state. If the resin is insufficient, it can be replenished and then continue to be injected;
7. Injecting and closing: After the injection speed is reduced, it is confirmed that the filling machine can be removed, and the base can be blocked with a plug;
8. After the resin is cured, knock off the base and plug, and clean the surface sealant. 
2, AB-grout resin
AB type resin is a special glue for grouting: there are several series of products of solvent type and water emulsion type. Grouting can be carried out for various conditions such as fine cracks (>0.05mm), wide cracks (>1.0mm), mortar, concrete, and brick hollow gaps.
AB resin is made of low viscosity epoxy resin, high polymer emulsion and other main agents, and is modified with various additives and active additives. The grout resin can be cured in a dry or humid environment, and has a small shrinkage of the resin body. High strength, good toughness and strong adaptability.
3, series sealant
Quick-drying sealing glue:
Quick-drying sealing glue is a kind of crack surface sealing and adhesive base glue used in conjunction with automatic pressure grouting. It is quick curing and firm bonding.
model
Number of scraping
Initial setting time
Groutable time
Match ratio
Quick drying
1 way
5 to 20 minutes
After 1-3 hours
A : B = 100 : 2 ~ 4
Mix the uniform component B according to the mixing ratio, immediately seal and stick the base, scrape it tightly, ensure that the crack is sealed, and the base is firmly adhered. The sealant is now available for use, and the composition of B in the summer is appropriately reduced.
The matching table is as follows: the sealing glue takes a blade, and the curing agent takes about one centimeter. Each time you dispense a small amount, you can use it with you.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn