(1) When using the mix proportion, the compatibility test analysis of admixtures and cement should be strengthened, and an admixture dosage curve should be made to determine the admixture saturation point dosage and use the admixture correctly. During the mixing process, the mixing time of concrete of each strength grade should be correctly specified. The mixing time should not be artificially reduced in pursuit of production volume. The admixture should be allowed to play its role within a sufficient mixing time.
(2) The quality and source of the cement entering the site should be strictly controlled. Products from the same manufacturer should be used as much as possible under the premise that the cement is relatively stable. It is not advisable to use newly produced cement that has not passed the stability period or has been stored for a long time. Cement with a low water seepage rate should be used as much as possible.
(3) For the selection of mineral admixtures, it is advisable to use higher-grade fly ash and slag powder, and the water requirement should be lower than that of cement. The dosage of mineral admixtures should be strictly controlled and appropriately adjusted under the premise of ensuring the various properties of concrete.
(4) Strengthen the detection mechanism. For fine aggregates with high stone content, the sand ratio should be appropriately increased in the mix proportion. For single coarse aggregates, two or three levels should be used. If continuous grading cannot be completed, the sand ratio should be increased according to the actual situation.
(5) During construction, if the construction conditions are met, concrete with a small slump should be used as much as possible. The vibration time of the concrete should be strictly controlled, and corresponding vibration processes should be adopted for concrete with different locations and properties. The cast concrete should be effectively maintained in a timely manner.
(6) Water seepage or delayed water seepage during the concrete construction process must be removed in a timely manner. The methods include vacuum absorption, manual water removal, or use of materials with strong water absorption properties (such as sponges). It is strictly forbidden to open holes in the formwork for self-flow, which will cause the loss of cementitious materials on the concrete surface and affect the quality of the concrete.
Post time: Oct-27-2025