When the slump loss of commercial concrete is too fast to be pumped under unpredictable circumstances, the method of adding after pumping agent can be adopted to solve the problem. After adding the pumping agent, the concrete transporter must run quickly for 2min, after determining the slump of the concrete meets the requirements, it can be used. The content of the addition should be determined in advance through the test, but it can not be used arbitrarily many times. If the content exceeds the limit, it will cause the concrete not to set for several days.
The finer the cement particle, the more water demand, the more water demand will aggravate the slump loss of concrete, to mitigate slump loss, must be through the pump agent adaptability test, determine the best pumping agent mixing.
Must be preferred pumping concrete with raw materials, cement, admixture, aggregate, pumping agent must meet the requirements of the standard quality, and have an understanding of its quality, performance, increase the frequency of reinspection, the application of the manufacturer is relatively stable, concrete mix through the test to determine and through the production practice of continuous optimization and summary, so that the optimal design of concrete mix, The aggregate has the best gradation, the least mud content and the least slump loss.
