Portland cement early-strength shrinkage-reducing agent

This is a kind of dry power material (referred to as concrete early-strength shrinkage-reducing agent) which is added to Portland cement-based mortar, concrete and products to improve early and late strength and reduce the volume shrinkage, and the code is CQJSJ. It has two types with type A and type B.

Application of CQJSJ-A:

CQJSJ-A mainly used in ready mixed concrete. Reduce the amount of cement usuage than usual  to lower the cost .

1.1、Premixed commodity concrete

Adding a small amount of early-strength shrinkage-reducing agent A can reduce the dosage of Portland cement in the concrete, reduce the cost of concrete; reduce the dry shrinkage, thus reducing the cracking; and reduce the carbon emission during the application of concrete.

1.2. The mass concrete with low cement, low adhesive material, high grade and low cost

   Adding properly proportioned early-strength shrinkage-reducing agent A can prepare mass concrete with low cement, low adhesive material, high grade and low hydration heat while properly reducing the dosage of Portland cement, which may reduce the cost of concrete; reduce the hydration heat of high-grade mass concrete, reduce the temperature difference between the core temperature and surface temperature of the concrete and also reduce the cracking.

1.3. Improve the durability of the concrete and prepare concrete and concrete products with high quality.

1.4. Use sand gravel aggregates with low quality to prepare the high performance concrete.

1.5. Use solid wastes and construction wastes to prepare the high performance concrete. 

Technical characteristics

1. Improve the early strength and the mould turnover rate, reduce the steam-curing temperature or shorten the steam-curing time, and improve the production efficiency.

2. Improve the late strength, and the 28d strength can be increased by 5-30%.

3. Have the micro expansion performance so as to compensate shrinkage, reduce the shrinkage of concrete and improve the anti-cracking ability.

4. Without requirement on early strength, adding the early-strength shrinkage-reducing agent can sharply reduce the mixing amount of Portland cement and lower the cost of concrete.

5. The mass concrete with low cement, low adhesive material, high grade and low hydration heat can still be prepared when properly reducing the dosage of Portland cement, which may reduce the cost of concrete, reduce the hydration heat of high-grade mass concrete, reduce the temperature difference between the core temperature and surface temperature of the concrete and also reduce the cracking.

6. Improve the frost resistance

7. Improve the anti-permeability