The Reaction Mechanism And Physical Properties Of Dry Thermal Curing Aerated Concrete

The traditional aerated concrete is protected by the steam of 1.0 MPa～1.5Mpa, the products are steamed under steam pressure from the outside into inside, water transmission from outside into the inside of the product, and water is filled in the pores and adobe nonporous. Hydrothermal synthesis reaction makes product low crystallization, nonporous increase with the status of high moisture content. Direct performance of products is low-intensity, high water absorption and drying shrinkage, poor antifreeze performance of a range of issues. Based on these problems, this study used dry thermal curing of aerated concrete instead of saturated steam curing, the surplus water of concrete body migrates to the outward in the curing process, and the hydrothermal synthesis reaction processed under appropriate water concentration. Changes of hydration product, moisture, water absorption, compressive strength, and the changes of antifreeze and contraction were studied.The results show that: the largest margin in the conservation of steam is 70℃, the largest margin between dry curing center body temperature and surface temperature is 35℃, and dry curing can greatly reduce the temperature between center and surface of the body. The moisture of dry thermal curing products was 7% lower than the steam water conservation, the ultimate moisture was 2% lower than the steam water conservation, the compressive strength of the dry thermal curing was10% higher than the steam water conservation, and the value of the contract of dry thermal curing aerated concrete was lower 3% than steam conservation aerated concrete. The losses of quality and intensity of the temporary are lower than steam conservation.