Four functions of adding water reducing agent to concrete
1. Dispersion effect. The water-reducing agent molecules can be directionally adsorbed on the surface of cement particles, so that the surfaces of the cement particles carry the same charge (usually n…
What precautions should be taken when adding coagulant during concrete pumping?
(1) Pay attention to the mutual adaptation with the cementitious material system. For different cementitious material systems, they can show different condensation and hardening properties, and they a…
What is the purpose of adding retarder and water reducing agent to pumped concrete?
1. Retarder: Pumped concrete mostly uses commercial concrete, which requires small slump loss. Especially for large-volume concrete or concrete constructed at high temperatures in summer, retarder mus…
How long is the final initial setting time of concrete after adding a retardant?
Generally, the temperature of commercial concrete here is about 18-24 degrees. I usually control the initial setting to 10 hours and the final setting to 12 hours under the conditions of 20 degrees in…
What is the mechanism of adding air-entraining agents to improve the durability of concrete?
Air-entraining agent is one of the chemicals. It has good bubble structure, small bubble radius, and high frost resistance index. It is used in high-durability concrete structures, such as dams, high-…
