How to adjust the water consumption of concrete when mixing mineral admixtures and admixtures

Admixture to fly ash for example, the water demand is not too large, otherwise the workability is not good, usually do the loss on ignition to determine, the admixture is based on the dosage to determine the dosage, and then calculate the amount of substituted water through the water reduction rate, with the water consumption without admixture minus the amount of water replaced by the admixture is the actual water consumption, which is best through the actual experiment that is, the trial match to determine the most suitable ratio.

Calculation of the dosage of superplasticizer: concrete admixture per square.

The amount of usage divided by the cementitious material.

dosage and. For example: water reducer for each square of concrete, cement 270kg, fly ash 70kg, mineral powder 70kg

The dosage of the admixture is the dosage that is often referred to as the dosage.

Polycarboxylate superplasticizer.

Synthesis equipment Concrete admixture compounding equipment, providing synthetic compounding technology on-site guidance production package teaching package.

Take the C30 mix ratio as an example: cement = 316 water = 200 fly ash = 67 mineral powder = 96 sand = 667 stone = 1033 admixture = water consumption table is 235kg, according to the manufacturer's product manual reference, water reducer: 2% dosage, water reduction rate 15% then the water consumption is 235 * (1-15%) 200 kg m water reducer dosage is 2% of the gelling dosage, that is:

Cement + fly ash + mineral powder (316 + 67 + 96) * 2% = 479 * 2% = instead of 2% of cement, i.e.: 316 * 2% = false).

Common mineral admixtures of concrete are frank: fly ash, granulated blast furnace slag, silica fume.

Limestone powder, steel slag powder, phosphate slag powder, zeolite powder.

Composite mineral admixture.

The readdition of mineral admixtures to the concrete can improve the mechanical properties of hardened concrete.

Improve the workability of mixed concrete and improve the durability of concrete.

Under the premise of improving the performance of concrete, the admixture in the mining area can replace 30% and 50% of the cement, which greatly reduces the amount of cement. The adsorption of water by the particles on the surface of the mineral admixture plays a role in water retention, and the cohesion is significantly improved. The concrete mixed with mineral admixture can form a relatively dense structure, and the water permeability of the concrete can be improved significantly, and the impermeability of the concrete can be improved by avoiding the formation of connected pores.

Fly ash, slag, silica fume, zeolite powder, etc.

In the 2022 new edition of the first Jianjiao imitation shirt material, the second half of page 41 to the first half of page 42 said that it is mainly used for grinding quartz sand, limestone, hard ore and other hail materials.

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In the calculation of ordinary concrete mix ratio, when adding superplasticizer, how to calculate the amount of superplasticizer?

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Hello! I'm glad that you answered the question of subtracting the water from the superplasticizer and reversing the ratio of the reducer. For example:

Ratio of admixtures: water 170, water reduction rate of admixtures 20%) without admixtures Ratio of imitation potatoes (converted): Dalu water:

170 (1-20%) = admixture: 0

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In the concrete mix ratio + can not be coarse aggregate, by applying sand to determine the amount of mineral admixture.

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Answer, the concrete mix ratio + can not be coarse, by sand to determine the amount of mineral admixture, without coarse aggregate can not be concrete! The so-called concrete is composed of cement, sand, stone and water, and it is also often sold in the right amount of admixtures and admixtures. In concrete, sand and stone play the load-bearing role of the skeleton, which is called fine and coarse aggregate respectively; Cement forms a cement slurry with water, which wraps around the surface of the aggregate and fills its voids.

The artificial stone made of uniform stirring, dense molding and curing and hardening is referred to as "concrete". Therefore, if the concrete has no coarse aggregate, that is, there is no stone, there is no concrete skeleton, and it cannot be called concrete!

Answer]: b, c, d, e

The use of mineral admixture can effectively improve the workability and durability of the concrete concrete with a small scale, and can improve the durability indexes of concrete, such as crack resistance, reinforcement protection, corrosion resistance, frost resistance, wear resistance and alkali-aggregate reactivity.

Answer]: A2022 version of the no-hand textbook P132

The water-glue ratio of the large amount of ore resistant material mixed with the imitation chachun compound concrete should not be greater.