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Full-lightweight ceramsite concrete and preparation method thereof

A technology of ceramsite concrete and ceramsite, which is applied in the field of building materials, can solve the problems of not meeting the requirements, increasing the porosity of concrete, and low early strength, so as to meet the requirements of density and strength, and improve cohesion and water retention , the effect of reducing concrete damage

Inactive Publication Date: 2019-10-08
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Full-lightweight ceramsite concrete and preparation method thereof
  • Full-lightweight ceramsite concrete and preparation method thereof
  • Full-lightweight ceramsite concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] An all-light ceramsite concrete, comprising the following components in parts by weight: cement: 308 parts, ceramsite: 318 parts, ceramsite: 382 parts, fly ash: 50 parts, silica fume: 39 parts, water reducing Dosage: 1.9 parts.

[0042] The cement is ordinary Portland cement, the density grade of the ceramsite is 500, the particle size is 5-10mm, the water absorption rate is 9% in 1h, and the apparent density is 720Kg / m 3 ; The density grade of the pottery sand is 500, the fineness modulus is 2.8, the 1h water absorption rate is 32%, and the apparent density is 1300Kg / m 3 .

[0043] The fly ash is national standard II grade fly ash, with a specific surface area of ​​260m2 / kg; the SiO2 content of the silica fume is ≥ 94%, and the specific surface area is ≥ 22000m2 / kg; the water reducer is a polycarboxylic acid high-performance water reducer .

preparation Embodiment 1

[0045] (1) Screen light aggregates (ceramsite and ceramsite), select shale ceramsite with a density grade of 500 (particle size 5-10 mm), and select ceramsite with a fineness modulus of about 2.8.

[0046] (2) Pre-wet the light aggregate, soak and saturate the light aggregate, filter the water through a square hole sieve with a sieve diameter of 0.075cm, and let the saturated surface dry in the air.

[0047] (3) Mixture preparation: uniformly mix ceramsite, ceramsite, cement, silica fume, fly ash, water, water reducing agent and cellulose respectively to obtain full light ceramsite concrete.

Embodiment 2

[0049] An all-light ceramsite concrete, comprising the following components in parts by weight: cement: 339 parts, ceramsite: 318 parts, ceramsite: 382 parts, fly ash: 55 parts, silica fume: 42 parts, water reducing Dosage: 1.7 parts.

[0050] The cement is ordinary Portland cement, the density grade of the ceramsite is 500, the particle size is 5-10mm, the water absorption rate is 9% in 1h, and the apparent density is 720Kg / m 3 ; The density grade of the pottery sand is 500, the fineness modulus is 2.8, the 1h water absorption rate is 32%, and the apparent density is 1300Kg / m 3 .

[0051] The fly ash is national standard II grade fly ash, with a specific surface area of ​​260m2 / kg; the SiO2 content of the silica fume is ≥ 94%, and the specific surface area is ≥ 22000m2 / kg; the water reducer is a polycarboxylic acid high-performance water reducer .

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B18/023C04B18/08C04B18/146C04B24/24C04B24/383
Inventor 王青占世兵徐港彭艳周刘冬梅柯帅丁超张萌
Owner CHINA THREE GORGES UNIV
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