The mix ratio design should establish the glue ratio, sand rate, active admixtures, admixture dosage, etc. according to the requirements. The glue ratio is directly related to the strength and workability of the mixture. If the glue ratio is large, the strength is generally high and the workability is good. On the contrary, the strength is low and the workability is poor, which is detrimental to improving bleeding and segregation.
The sand ratio in the mix should be reasonably designed and adjusted based on the sand and gravel gradation. In the case of 5 to 31.5mm, the sand fineness modulus is lower than 2.4 , the sand rate can be reduced; conversely, the sand rate can be appropriately increased. If the gravel is 5 to 20.0 mm, the sand rate can be increased and the workability can be changed based on the actual test results to effectively improve the probability of bleeding and segregation.
The amount of active admixture in the proportion should be based on "Fly Ash for Cement and Concrete" GB/T1596-2017, "Used for Cement" , Granulated Blast Furnace Slag Powder in Mortar and Concrete" GB/T18046-2017 and physical requirements, conduct reasonable design and trial preparation verification. Large-volume, high-strength, high-performance concrete with large amounts of fly ash, slag powder and other active admixtures can effectively improve the heat of hydration, loss over time, workability, durability, etc., and at the same time effectively improve the bleeding of the mixture. and the possibility of segregation.
Concrete mix design should first consider the workability and strength of concrete, followed by economy. Combining the three, it is most effective to reduce the water consumption per unit of concrete. . After trial mixing, the lowest single water consumption under different water-cement ratios is selected, which can maintain better workability under the same slump, leaving the concrete with no free water to bleed, and naturally solving the bleeding problem.
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