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A low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel and its preparation method

A high-strength concrete and aeolian sand technology, applied in the field of building materials, can solve the problems of low natural river sand reserves, influence and restrict the use of concrete, and achieve the effects of small dosage, broad application prospects and reduction of shrinkage cracking risks.

Active Publication Date: 2021-02-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reserves of natural river sand in nature are very small. With the massive consumption of engineering construction, natural high-quality river sand is becoming less and less, which has seriously affected and restricted the use and development of concrete.

Method used

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  • A low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel, which includes the following components in parts by weight:

[0042] 604.8 parts of Portland cement, 302.4 parts of fine beads, 100.8 parts of silica fume, 705.6 parts of aeolian sand, 403.2 parts of Gobi gravel, 20.2 parts of polycarboxylate superplasticizer, and 161.3 parts of water.

[0043] Preparation:

[0044] (1) Weigh the required materials, including: Portland cement, fine beads, silica fume, aeolian sand, polycarboxylate superplasticizer and tap water;

[0045] (2) Wetting the mixer and the tools and molds used;

[0046](3) Add the weighed Portland cement, fine beads, and silica fume into the concrete forced single-horizontal shaft mixer in turn for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain a mixed cementitious material;

[0047] (4) adding the weighed aeolian sand into the mixed cementitious material in step (3), stirring at a slow...

Embodiment 2

[0051] A low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel, which includes the following components in parts by weight:

[0052] 568.1 parts of Portland cement, 284.1 parts of fine beads, 94.7 parts of silica fume, 662.8 parts of aeolian sand, 378.8 parts of Gobi gravel, 3.8 parts of polycarboxylate superplasticizer, and 227.3 parts of water.

[0053] Preparation:

[0054] (1) Weigh the required materials, including: Portland cement, fine beads, silica fume, aeolian sand, polycarboxylate superplasticizer and tap water;

[0055] (2) Wetting the mixer and the tools and molds used;

[0056] (3) Add the weighed Portland cement, fine beads, and silica fume into the concrete forced single-horizontal shaft mixer in turn for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain a mixed cementitious material;

[0057] (4) adding the weighed aeolian sand into the mixed cementitious material in step (3), stirring at a slow ...

Embodiment 3

[0061] A low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel, which includes the following components in parts by weight:

[0062] 589.4 parts of Portland cement, 294.7 parts of fine beads, 98.2 parts of silica fume, 687.6 parts of aeolian sand, 392.9 parts of Gobi gravel, 5.9 parts of polycarboxylate superplasticizer, and 196.5 parts of water.

[0063] Preparation:

[0064] (1) Weigh the required materials, including: Portland cement, fine beads, silica fume, aeolian sand, polycarboxylate superplasticizer and tap water;

[0065] (2) Wetting the mixer and the tools and molds used;

[0066] (3) Add the weighed Portland cement, fine beads, and silica fume into the concrete forced single-horizontal shaft mixer in turn for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain a mixed cementitious material;

[0067] (4) adding the weighed aeolian sand into the mixed cementitious material in step (3), stirring at a slow ...

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Abstract

The invention discloses a low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel and a preparation method thereof. The low-shrinkage high-strength concrete material mainly consists of 568.1-604.8 parts of Portland cement and 284.1 parts of fine beads ‑302.4 parts, silica fume 94.7‑100.8 parts, aeolian sand 589.4‑785.7 parts, Gobi gravel 294.6‑491.2 parts, water reducing agent 3.8‑20.2 parts, water 161.3‑227.3 parts. The preparation process of the invention is simple, and the high-strength concrete material with excellent fluidity, strength and long-term stability can be prepared by using a conventional forced concrete single-horizontal shaft mixer. In addition, the present invention uses two natural materials, aeolian sand and Gobi gravel, which are rich in reserves and low in price, and the concrete mixed with aeolian sand and Gobi gravel instead of natural river sand and basalt gravel is the development of engineering materials. An inevitable trend, it can be widely used in the Northwest of China, and local materials can be used to adapt measures to local conditions, bringing great economic and social benefits.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a low-shrinkage high-strength concrete material mainly composed of aeolian sand and Gobi gravel and a preparation method thereof. Background technique [0002] Concrete is the most widely used artificial building material in the world. It is a multiphase composite material mainly composed of cementitious materials, sand, water and admixtures. It has high compressive strength, good workability, and good fire resistance. And the resistance to environmental erosion is the main reason for the promotion and use of engineering circles. Sand and gravel are commonly used raw materials for mixing concrete. At present, the commonly used sand is natural river sand, because natural river sand has the characteristics of moderate moisture content, good particle gradation, and small mud content. The concrete made of it can well meet the engineering requirements. Require. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/06C04B14/02
CPCC04B14/02C04B14/068C04B28/04C04B2201/50C04B18/146C04B20/0016C04B24/24C04B22/002
Inventor 蒋金洋周文静褚洪岩王凤娟武胜萍冯滔滔王立国
Owner SOUTHEAST UNIV