How to determine the amount of C35 fly ash in concrete

Generally, it is 15 20 cement dosage, and the grade of fly ash and self-test results should be considered, such as the recommended dosage of 15, that is, the cement dosage x 15 x excess coefficient.

S95 grade of mineral powder can replace a part of the cement in equal amounts, according to different mix ratios are generally 40 70 kg per cubic meter to replace the amount of cement, pretend to be 2 grade fly ash can replace a part of the cement, the excess is generally times the amount of cement, the amount of fly ash is about 80 100 kg per cubic meter.

The amount of fly ash is generally less than 20%, the mineral powder is generally less than 30%, and the grade 2 fly ash is recommended to be mixed with 10% 15%, and the mineral powder is within 30%.

Hello. The quality requirements of fly ash used as concrete admixture are generally as follows:

1.Water requirement ratio. The larger the water demand ratio, the greater the water consumption of concrete, which will lead to an increase in the water-cement ratio and a decrease in strength. The water demand of the national standard secondary ash shall not be greater than 105%.

2.Fineness. The greater the fineness, the worse the hydraulic response of fly ash, resulting in lower concrete strength. Secondary ash requires a screening allowance of less than 20%.

3.Loss on ignition. The standard requires that the loss on secondary ash should be less than 8%. The larger the loss on ignition, the more impurities that can cause chemical reactions in the fly ash, which will cause adverse reactions with cement.

Summary. This depends on the specific mix design report. Generally, the amount of cement per cubic meter of C25 concrete is about 300 kg (grade), and if fly ash is added according to 3% of the amount of cement, then each square is 9 kilograms, and 1000 square meters is 9000 kilograms (9 tons).

This depends on the specific mix design report. Generally, C25 concrete lead excavation soil per cubic meter of cement dosage of about 300 kilograms (grades) of macro silver, fly ash if added according to 3% of the amount of cement, then each square is 9 kilograms, 1000 square meters is 9000 kilograms (9 tons).

Dosage of superplasticizer.

Send me a match.

Just talk about how much to use.

That's the proportion.

I won't count.

Just give me a number.

707kg of sand is needed and 410kg of cement is needed

How much fly ash and water reducer are used.

C25 is used for alkaline water.

The weight of fly ash * 2% (the amount of content.

Summary. Dear, hello, the best amount of fly ash for 1 cubic concrete is: the amount of fly ash is generally less than 20%, the amount of mineral powder is generally less than 30%, and the second grade of fly ash is recommended to be mixed with 10% 15%, and the powder is within 30%, and the specific amount should be determined according to the trial.

In addition to the pozzolanic effect, there are two other reasons why fly ash improves the mechanical properties and durability of concrete

First, the topography effect. The main mineral composition of fly ash is vitreous, which has a smooth surface, fine particle size, dense texture, small internal specific surface area, and small adsorption force to water.

Therefore, the addition of fly ash reduces the water requirement for concrete preparation, reduces the early drying shrinkage of concrete, and greatly improves the compactness of concrete.

Second, the filling effect. The fine particles in fly ash are evenly distributed in the cement particles, which can not only fill the voids between the cement particles, but also improve the particle gradation of the cementitious material and increase the compactness of the cement colloid. Therefore, the morphology effect, the filling effect and the pozzolanic effect are called the three major effects of fly ash to improve the performance of concrete.

What is the optimal amount of fly ash for 1 cubic concrete and how to calculate it?

Dear, hello, the best amount of fly ash for 1 cubic concrete is: the amount of fly ash is generally less than 20%, the amount of mineral powder is generally less than 30%, and the second grade of fly ash is recommended to be mixed with 10% 15%, and the powder is within 30%, and the specific amount should be determined according to the trial. In addition to the pozzolanic effect, there are two other reasons why fly ash improves the mechanical properties and durability of concrete

First, the topography effect. The main mineral composition of fly ash is vitreous, which has a smooth surface, fine particle size, dense texture, small internal specific surface area, and small adsorption force to water. Therefore, the addition of fly ash reduces the water requirement for concrete preparation, reduces the early drying shrinkage of concrete, and greatly improves the compactness of concrete. Second, the filling effect.

The fine particles in fly ash are evenly distributed in the cement particles, which can not only fill the voids between the cement particles, but also improve the particle gradation of the cementitious material and increase the compactness of the cement colloid. Therefore, the morphology effect, the filling effect and the pozzolanic effect are called the three major effects of fly ash to improve the performance of concrete.

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Generally, the amount of cement is 15 20, and the grade of fly ash and the self-test results should be considered in the previous report, such as the recommended dosage of 15, that is, the amount of cement x 15 x excess Huishan coefficient. In order to protect the strength of the disturbance, the amount of concrete is reduced compared with C30. Generally, it is reduced by about 5%.