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High-strength light-weight concrete and preparation method thereof

A high-strength concrete and lightweight technology, applied in the field of building materials, can solve problems such as concrete strength attenuation, achieve the effect of reducing bulk density, reducing floating, and improving the application range

Inactive Publication Date: 2015-07-29
JIANGSU MINGHE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, gas is the lightest aggregate, but the large size of air bubbles will cause the strength of concrete to decrease greatly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A lightweight high-strength concrete and its preparation method.

[0028] A kind of light-weight high-strength concrete, the raw material formula includes the following mass percentage materials:

[0029] Cementitious material: P·O52.5 cement (ordinary Portland cement with grade 52.5) ​​20%; vitrified beads 10%; silica fume 5%; among them, vitrified beads and silica fume belong to low-density cementing material. The particle size range of vitrified microbeads is 10-50nm. The specific surface area of ​​the silica fume is 25000m 2 / kg of silica fume, and SiO 2 The content is 94%;

[0030] Aggregate: ceramsite 25%; ceramic sand 30%. Said ceramsite is crushed shale ceramsite with a particle size of 5-16mm, a cylinder compression strength of 8.9Mpa, and a density grade of 900;

[0031] Water reducing agent: 0.4% polycarboxylic acid high-performance water reducing agent produced by Suzhou Fuke Technology Co., Ltd.;

[0032] Molecular sieve: 13x molecular sieve 0.1%, rati...

Embodiment 2

[0041] Embodiment 2: A lightweight high-strength concrete and its preparation method.

[0042] The light-weight high-strength coagulation raw material formula includes the following materials in percentages by mass:

[0043] Portland cement 18%;

[0044] Vitrified beads 10%;

[0045] Silica fume 6%;

[0046] Ceramsite 25%;

[0047] 30% pottery sand;

[0048] High performance water reducing agent 0.5%;

[0049] Molecular sieve 0.1%;

[0050] Air-entraining agent 0.5%;

[0051] Water 9.9%.

[0052] The preparation method is the same as in Example 1.

Embodiment 3

[0053] Example 3: A lightweight high-strength concrete and its preparation method.

[0054] The light-weight high-strength coagulation raw material formula includes the following materials in percentages by mass:

[0055] Portland cement 27%;

[0056] Vitrified beads 6%;

[0057] Silica fume 3%;

[0058] Ceramsite 20%;

[0059] Pottery sand 34%;

[0060] High performance water reducing agent 0.8%;

[0061] Molecular sieve 0.3%;

[0062] Air-entraining agent 0.8%;

[0063] Water 8.1%.

[0064] The preparation method is the same as in Example 1.

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Abstract

The invention relates to high-strength light-weight concrete and a preparation method thereof. The preparation method comprises the following steps: step 1, ceramsites and pottery sand which are included in the raw material formula of the high-strength light-weight concrete are soaked in water to fully absorb water; step 2, adding the ceramsites and pottery sand absorbed with water and the rest of materials to a stirring machine, stirring for 3 min to obtain a high-strength light-weight concrete mixture. The high-strength light-weight concrete in the raw material formula comprises the following raw materials in percentage by weight: 18-27% of portland cement, 6-10% of vitrified microspheres, 2-6% of silica fume, 20-30% of ceramsites, 25-35% of pottery sand, 0.2-0.8% of a high-performance water reducing agent, 0.05-0.3% of molecular sieves, 0.05-0.8% of an air entraining agent and 8-12% of water. According to the high-strength light-weight concrete and the preparation method thereof, provided by the invention, through the combined action of the adopted molecular sieves and the air entraining agent, a large number of air holes causing little influence on the strength is introduced into the concrete, the unit weight of the high-strength light-weight concrete is reduced, the application range of the high-strength light-weight concrete is expanded, the possibility that aggregate in the concrete tends to float upwards due to density variation can be greatly reduced under the existence of the air holes.

Description

Technical field [0001] The invention relates to a lightweight high-strength concrete and a preparation method thereof, and belongs to the field of building materials. Background technique [0002] Lightweight high-strength concrete (HSLC) has the advantages of light weight, high strength, good durability, alkali-free aggregate reaction, good volume stability, and good thermal insulation performance. It has been widely used in offshore structures, high-rise buildings, and long-span bridges overseas. And the city overpass and other projects. [0003] The key technology for preparing lightweight and high-strength is how to obtain low-density and high-strength lightweight aggregates. With the development of modern technology, some new aggregates such as silicone gel have been tried to be used in lightweight high-strength concrete. As we all know, gas is a kind of aggregate with the lightest density, but the excessively large bubble diameter will cause the concrete strength to decrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 耿长圣臧军
Owner JIANGSU MINGHE GRP
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