High-fluidity concrete additive and preparation method thereof

Abstract

The invention relates to a high-fluidity concrete additive and a preparation method thereof. The high-fluidity concrete additive comprises a surfactant material and coal ash. The preparation method comprises the step of adequately mixing boiling coal ash with an atomized surfactant solution. According to the high-fluidity concrete additive, the fluidity and the gradual fluidity of concrete can be improved, the activity index of coal ash can be improved, and the adaptability of a water reducer can be improved; the high-fluidity concrete additive is low in cost and easy to prepare and is particularly applicable to pump concrete or self-compacting concrete with relatively high requirement for fluidity.

Description

technical field

[0001] The invention relates to a high fluidity concrete admixture and a preparation method thereof. Background technique

[0002] Fly ash is a commonly used concrete mineral admixture, which has many functions such as improving the workability of slurry, reducing the heat release of hydration, improving durability, and reducing the cost of concrete production. Its microscopic morphology is mostly spherical particles, which has a "ball effect" in concrete, which can significantly improve the fluidity of fresh concrete, improve the constructability and pumpability of concrete. Studies have shown that when 30% fly ash is used instead of cement, the slump can be increased by 20mm~40mm for fresh concrete without water reducer. However, there is always a small amount of unburned carbon particles in fly ash, especially low-quality fly ash usually has a high carbon content, and these carbon particles with a porous structure have a strong effect on concrete admi...

Examples

Embodiment

[0020] Table 1 High fluidity concrete admixture formula (mass ratio, unit: parts by mass)

[0021]

1 2 3 fly ash 1000 1000 1000 molasses 2 wood calcium 3 sodium gluconate 1

[0022] The preparation method is that the surfactant material is dissolved in water to prepare a surface modification material solution with a concentration of 20%; the fly ash is boiled by air fluidization, and then according to the mixing ratio in Table 1, ultrasonic The atomization device mixes the atomized surface modification material solution particles and the fly ash material evenly to obtain the patented product.

[0023] Prepare high-fluidity concrete admixtures (respectively denoted as CHL-1 and CHL-3) according to Scheme 1 and Scheme 3 in Table 1, and then prepare C40 concrete according to the material ratio in Table 2 (respectively denoted as HNT- 1 and HNT-3). In order to compare the traditional method, the same amount of or...

technical field

[0001] The invention relates to a high fluidity concrete admixture and a preparation method thereof. Background technique

[0002] Fly ash is a commonly used concrete mineral admixture, which has many functions such as improving the workability of slurry, reducing the heat release of hydration, improving durability, and reducing the cost of concrete production. Its microscopic morphology is mostly spherical particles, which has a "ball effect" in concrete, which can significantly improve the fluidity of fresh concrete, improve the constructability and pumpability of concrete. Studies have shown that when 30% fly ash is used instead of cement, the slump can be increased by 20mm~40mm for fresh concrete without water reducer. However, there is always a small amount of unburned carbon particles in fly ash, especially low-quality fly ash usually has a high carbon content, and these carbon particles with a porous structure have a strong effect on concrete admi...

Examples

Embodiment

[0020] Table 1 High fluidity concrete admixture formula (mass ratio, unit: parts by mass)

[0021]

1 2 3 fly ash 1000 1000 1000 molasses 2 wood calcium 3 sodium gluconate 1

[0022] The preparation method is that the surfactant material is dissolved in water to prepare a surface modification material solution with a concentration of 20%; the fly ash is boiled by air fluidization, and then according to the mixing ratio in Table 1, ultrasonic The atomization device mixes the atomized surface modification material solution particles and the fly ash material evenly to obtain the patented product.

[0023] Prepare high-fluidity concrete admixtures (respectively denoted as CHL-1 and CHL-3) according to Scheme 1 and Scheme 3 in Table 1, and then prepare C40 concrete according to the material ratio in Table 2 (respectively denoted as HNT- 1 and HNT-3). In order to compare the traditional method, the same amount of or...

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