Water reducer has the advantages of improving concrete workability, reducing water consumption, increasing strength, and improving concrete durability. However, in the calculation method of the amount of water reducer, it is easy to ignore the adsorption of powder materials in concrete aggregates on water reducers. The water reducer output of low-strength concrete is low, and the powder material in the aggregate is insufficient after adsorption. However, the water reducer dosage of high-strength concrete is relatively large, and the adsorption amount of powder in the aggregate is not much different from that of low-strength powder, which will cause the high-strength water reducer dosage to be low.

When designing the mix ratio, the water reducer dosage is just right, not too much or too little, which is convenient for production control and ensures the stability of concrete quality. This is the goal pursued by concrete technicians. However, whether the concrete raw materials used are natural or artificial, some powder materials are inevitably brought in. Therefore, when designing the mix ratio, the powder materials of the concrete raw materials should be considered when calculating the water reducer dosage.

Before calculating the water reducer dosage, the mix ratio and water reducer dosage of the benchmark concrete are determined by experiments, and then the total powder volume of the concrete is calculated according to the concrete mix ratio, and the water reducer dosage is calculated; then the calculated dosage is used to calculate the water reducer dosage of other strength grades.

With the large-scale use of machine-made sand and the increase of powder materials, the powder absorbs or consumes a certain amount of water reducer. Calculating the amount of water reducer using the total powder content of concrete raw materials is easier to control and is relatively more scientific.