Basic usage of water glass type acid-resistant cement 2012-2-9 13:54:46
The basic usage of water glass type acid-resistant cement:
1. In principle, when mixing the clay or making acid-resistant concrete, sodium fluosilicate as a hardening agent needs to be added and fully mixed with acid-resistant cement evenly; it is best to sieve twice, then mix and stir evenly with water glass solution with a specific gravity of 1.38~1.45 and modulus of 2.60~2.80.
2. When using, place the well-mixed product in a container first, then add the water glass solution, and stir evenly and quickly; generally, each stirring should be less than one hundred kilograms, and the prepared clay must be used within 50 minutes. The tools and containers used must not contain moisture or other impurities. When bonding acid-resistant bricks, staggered joints should be used.
3. Before construction, metal equipment should be derusted and cleaned, brick structures should be brushed clean, and the surface of alkaline ordinary cement structures should be neutralized with acid first, then washed with water, and dried by heating. Generally, the moisture content should be less than 4%.
4. Acid-resistant cement should be hardened at a temperature above 15℃, and cured in the air for about 10~20 days (in winter, the temperature is low and the time is longer, so it is better not to use). During the curing period, it must not come into contact with water or water components, and should not be directly exposed to sunlight to prevent cracking. Cracks should be repaired in time, otherwise delamination may occur after a long time.
5. After curing and drying, acid treatment should be carried out. The basic method is to brush its surface with 40% sulfuric acid every four hours, and remove the crystals precipitated each time.
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