The cooperation ratio is the center of concrete. Due to significant differences in the trial conditions between the production and construction practice sites and the laboratory, the trial strength differs significantly from the actual production and construction strength.

The preventive measures for abnormal concrete cooperation ratio are as follows:

(1) In general, during the planning process of concrete cooperation ratio, the assurance coefficient of planning strength should be improved to eliminate the impact of unfavorable factors on the formation of concrete strength during production and construction processes.

(2) Pay attention to the early strength of concrete (such as 3D). When abnormal early strength is found, timely search for elements and make corresponding adjustments to the benchmark cooperation ratio.

(3) In the process of concrete production, effective methods are adopted to control the influence of the fluctuation of aggregate moisture content on the formation of concrete quality. When using the above materials, adopt the first in, first in principle; On rainy days, strengthen the inspection of aggregate moisture content. The production cooperation ratio should be adjusted in a timely manner based on changes in aggregate moisture content to ensure the workability of the concrete mixture and meet construction requirements. Regarding the poor workability of concrete mixtures, they should not be allowed to leave the factory.