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Lightweight aggregate high-performance concrete and preparation method thereof

A high-performance concrete and lightweight aggregate technology, applied in the field of concrete, can solve the problems that affect the popularization and application of lightweight aggregate concrete, do not comply with low-carbon environmental protection, and poor constructability, so as to improve uniformity and compactness, light bulk density, and reduce The effect of bulk density

Inactive Publication Date: 2017-06-13
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the research results of lightweight aggregate concrete with light weight and high strength, the bulk density is too large, mostly in the range of 1700-1900kg / cm 3 , the amount of cement is also too much, generally 400kg / cm 3 About, some even reach 500kg / cm 3 The above are obviously not economical and do not meet the requirements of low-carbon environmental protection
Moreover, light aggregates are easy to float, easy to segregate with cementitious materials, and poor in construction, which is another important problem affecting the popularization and application of light aggregate concrete.

Method used

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  • Lightweight aggregate high-performance concrete and preparation method thereof
  • Lightweight aggregate high-performance concrete and preparation method thereof
  • Lightweight aggregate high-performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Cement: 42.5 general purpose Portland cement.

[0020] Lightweight aggregate: Ceramsite is 5-19mm crushed shale ceramsite, density grade is 800, cylinder compression strength is 6.5Mpa, and 1h water absorption rate is 3%.

[0021] Sand: shale ceramic sand, density grade 700, 1~5mm, medium coarse sand with fineness modulus 2.6~3.3, bulk density 750~850kg / m 3 .

[0022] Reclaimed sand: construction waste reclaimed sand, medium sand in Zone II with a fineness modulus of 2.6 to 3.3, and a bulk density of 1450 to 1550 kg / m 3 .

[0023] Fly ash: Zhenjiang Jianbi Power Plant Class I fly ash, with a specific surface area of ​​400m 2 / kg above, density is 2.2~2.4g / cm 3 .

[0024] Ground slag powder: Shanghai Baosteel S95 slag powder with a specific surface area of ​​450m 2 / kg above, the density is 2.5~2.9g / cm 3 .

[0025] Water reducing agent: polycarboxylic acid superplasticizer, solid content is more than 20%, water reduction rate is more than 25%.

[0026] Raw materials: 180 parts of ce...

Embodiment 2

[0029] Raw materials: 309 parts of cement, 619 parts of high-performance ceramsite, 103 parts of fly ash, 103 parts of mineral powder, 458 parts of ceramic sand, 50 parts of construction waste reclaimed sand, 145 parts of water, 6.5 parts of water reducing agent, reinforced modified materials 1.0 part and 0.56 part of anti-segregation material. Among them, the reinforced modified material is sodium silicate, sodium sulfate and organic alcohol amine with a weight ratio of 65:30:5; the organic alcohol amine is 50% by mass of diethanol monoisopropanolamine and 50% of three A mixture of isopropanolamine; the anti-segregation material is a mixture of modified methyl cellulose and carboxymethyl cellulose with a weight ratio of 75:25.

[0030] Preparation process: Using a forced mixer, first premix the light aggregate ceramsite ceramsite in the mixing drum for 30 seconds, add additional water according to the pre-tested water absorption rate of the ceramsite and ceramsite, mix well and ...

Embodiment 3

[0032] Raw materials: 258 parts of cement, 619 parts of high-performance ceramsite, 103 parts of fly ash, 154 parts of mineral powder, 458 parts of ceramic sand, 50 parts of construction waste reclaimed sand, 135 parts of water, 5.2 parts of water reducing agent, reinforced modified materials 1.2 parts and 0.60 parts of anti-segregation materials. Among them, the reinforced modified material is sodium silicate, sodium sulfate and organic alcohol amine with a weight ratio of 60:30:10; the organic alcohol amine is 60% by mass of diethanol monoisopropanolamine and 40% of triisopropanol. Isopropanolamine mixture; the anti-segregation material is a mixture of modified methylcellulose and carboxymethylcellulose with a weight ratio of 70:30.

[0033] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a lightweight aggregate high-performance concrete and a preparation method thereof. The lightweight aggregate high-performance concrete contains the following raw materials: 180-310 parts of cement, 580-650 parts of ceramsite, 420-500 parts of pottery sand, 0-80 parts of sand regenerated from construction waste, 100-130 parts of coal ash, 100-210 parts of mineral powder, 130-160 parts of water, 4.5-6.5 parts of water reducer, 1-1.5 parts of enhanced modified material and 0.45-0.60 part of anti-separation material. The lightweight aggregate high-performance concrete has the advantages of light unit weight (1450-1550kg / m3), high 28-day strength (40-50MPa), separation resistance, capability of being pumped, slump of 190-250mm, divergence of 400-550mm, no aggregate floating, simple preparation method, high operability and low cost.

Description

Technical field [0001] The invention belongs to the field of concrete, and in particular relates to a lightweight aggregate high-performance concrete and a preparation method thereof. Background technique [0002] Lightweight aggregate concrete refers to the use of natural porous lightweight aggregate or artificial ceramsite as coarse aggregate, natural sand or light sand as fine aggregate, using Portland cement, water and additives (or without additives) according to the combination The dry apparent density is not more than 1950kg / m. 3 Concrete. [0003] With the need for high-rise buildings and assembly-oriented construction, lightweight and high-strength lightweight aggregate concrete facilitates the construction and installation of components, which will greatly reduce construction and installation costs, reduce energy consumption during the construction process, and is very beneficial to the seismic resistance of buildings Performance improvement. [0004] In addition, a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B18/027C04B18/023C04B18/167C04B18/08C04B18/142C04B22/08C04B22/147C04B24/122C04B24/383C04B38/08C04B38/0067
Inventor 王素瑞黄献文仝昇德鲜茂君潘达
Owner JIANGSU UNIV OF SCI & TECH
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