1. When the slump loss of commercial concrete is too fast to be pumped due to unpredictable circumstances, the post-addition method of pumping agent can be used to solve the problem.
2. The finer the cement particles, the greater the water demand. The increase in water demand will inevitably increase the loss of concrete slump. To alleviate the loss of slump, it is necessary to pass the pumping agent adaptability test to determine the optimal dosage of pumping agent .
3. It is necessary to optimize the raw materials for pumping concrete. Cement, admixtures, aggregates, pumping agents, etc. must meet the quality requirements of the standards, and have an understanding of their quality and performance, increase the frequency of re-inspection, and apply production The manufacturer is relatively stable, and the concrete mix ratio is determined through experiments and continuously optimized and summarized through production practice, so as to achieve the best concrete mix ratio design, the best aggregate gradation, the least mud content, and the smallest slump loss.
4. Adding air-entraining agent or air-entraining retarder to concrete can effectively reduce the slump loss of concrete, and the amount to be added is determined by experiment. After the air-entraining agent is added, a large number of fine and dense air bubbles are generated, which can isolate a large number of dispersed cement particles, which is an effective way to reduce the secondary adsorption of cement and reduce the loss of concrete slump. The appropriate air content of concrete is also to improve the workability of concrete, Effective pathway for cohesion, water retention, pumpability.
5. In the high temperature season in summer, the amount of admixture can be increased through experiments, and the loss of concrete slump can be effectively reduced.
