Full-lightweight ceramsite concrete and preparation method thereof

Abstract

The invention relates to full-lightweight ceramsite concrete and a preparation method thereof. The full-lightweight ceramsite concrete is prepared from, by weight, 278-339 parts of cement, 318-344 parts of ceramsite, 334-382 parts of pottery sand, 50-55 parts of coal ash, 35-42 parts of silica fume, 0.001-3 parts of triisopropanolamine, 0.5-3 parts of a water reducing agent and 0.001-3 parts of athickening agent. The method includes steps: subjecting ceramsite and pottery sand to surface pretreatment through alkyl alkoxy silane, prewetting ceramsite and pottery sand to achieve a saturated surface dry state, then sequentially feeding lightweight aggregates, cement, silica fume and coal ash into a forced mixer, and well mixing to obtain the full-lightweight ceramsite concrete. The full-lightweight ceramsite concrete prepared according to the method has advantages of light weight, high peaceability and effectiveness in inhibition of ceramsite floating and has a promising application prospect in the field of energy-saving construction engineering.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an all-light ceramsite concrete and a preparation method thereof. Background technique [0002] Light aggregate concrete is a kind of concrete prepared with light aggregate and cement, with an apparent density not greater than 1950Kg / m3. Among them, the most widely used ceramsite concrete is the concrete prepared by ceramsite, light sand (or ordinary sand), cement and water. Compared with ordinary concrete, it can reduce its own weight by 20% to 25% while maintaining high strength, and has high durability. It also has thermal insulation, heat insulation, fire resistance, corrosion resistance, environmental protection, and good earthquake resistance. advantage. But it still has some shortcomings, such as the self-weight is still relatively large, and the aggregate floats seriously, which leads to poor process effect. Generally, in order to further reduce the bulk density of li...

AI Technical Summary

Problems solved by technology

However, as the aggregate density level further decreases, it becomes more and more difficult to control the flotation of the aggregate of the mixture; the decrease of the cement-sand ratio makes the workability of the concrete significantly worse, the cohesion of the concrete mixture is poor, the fluidity is not good, and the increase The amount of superplasticizer is easy to cause concrete layering and segregation, so that it is difficult to pour into shape; the decrease of sand ratio makes the particle size distribution of coarse and fine aggregates more uneven, and the porosity of concrete also increases accordingly. At this time, the demand for cementitious materials increases instead. large, the strength decreases

To sum up, with the decrease of concrete density, it becomes more and more difficult to meet the requirements of concrete workability, strength and density at the same time.

Because the workability of the mixture is not stable enough, it is more difficult to ensure workability in actual production than in test sample pouring, and generally the early strength is not high, which is not conducive to accelerating production

[0004] During the preparation process of all-light ceramsite concrete, it was found that in order to reduce the concrete to 1200 grade and at the same time ensure the strength requirements of structural insulation lightweight aggregate concrete, the use of 700-grade ceramsite and ceramsite as aggregates cannot meet the requirements, so it can only be Use 500-grade ceramsite and ceramsite, and JGJ51-2002 does not give a recommended amount of cement for concrete with a lightweight aggregate grade of 500, which can only be determined through experiments

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