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High-flowability high-performance concrete with low cementing material content, and preparation method thereof

A high-performance concrete and high-fluidity technology, applied in the field of concrete preparation, can solve problems such as large self-shrinkage of concrete, economic problems of concrete, and impact on the durability of structures, so as to reduce overall costs, reduce concrete quality defects, and reduce water The effect of heating

Inactive Publication Date: 2021-03-02
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the technical measures of increasing the cementitious material and sand ratio only through the water-binder ratio will cause the concrete to shrink greatly and affect the durability of the structure; simply increasing the amount of cementitious materials and introducing silica fume or microbeads will bring concrete economic issues

Method used

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  • High-flowability high-performance concrete with low cementing material content, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-glue high-fluidity high-performance concrete, including the following raw materials in parts by weight: 520 parts of cementitious material, 626 parts of medium sand, 1061 parts of gravel, 130 parts of water, and 4.88 parts of water reducing agent;

[0027] The low-glue high-fluidity high-performance concrete is made by the following method:

[0028] Add medium sand, gravel and cementitious materials into the mixer, and stir at a speed of 50r / min for 1min to prepare a mixture, then add water and water reducer to the mixer in turn, and continue stirring at this speed for 5min to prepare To obtain high-performance concrete with low glue and high fluidity.

[0029] The water reducer is a polycarboxylate water reducer, and the gravel is blended from two grades of materials with a particle size of 5mm and 10mm in a weight ratio of 1:1.

[0030] The cementitious material is made by the following methods:

[0031]Step S1. Add acrylic acid and polyethylene glycol monomet...

Embodiment 2

[0037] A high-performance concrete with low glue material and high fluidity, including the following raw materials in parts by weight: 530 parts of cementitious material, 650 parts of medium sand, 1080 parts of crushed stone, 135 parts of water, and 5.25 parts of water reducer;

[0038] The low-glue high-fluidity high-performance concrete is made by the following method:

[0039] Add medium sand, gravel and cementitious materials into the mixer, and stir at a speed of 50r / min for 1min to prepare a mixture, then add water and water reducer to the mixer in turn, and continue stirring at this speed for 5min to prepare To obtain high-performance concrete with low glue and high fluidity.

[0040] The water reducer is a polycarboxylate water reducer, and the gravel is blended from two grades of materials with a particle size of 5mm and 10mm in a weight ratio of 1:1.

[0041] The cementitious material is made by the following methods:

[0042] Step S1. Add acrylic acid and polyethy...

Embodiment 3

[0048] A high-performance concrete with low glue material and high fluidity, including the following raw materials in parts by weight: 550 parts of cementitious material, 686 parts of medium sand, 1130 parts of crushed stone, 138 parts of water, and 7.25 parts of water reducing agent;

[0049] The low-glue high-fluidity high-performance concrete is made by the following method:

[0050] Add medium sand, gravel and cementitious materials into the mixer, and stir at a speed of 50r / min for 1min to prepare a mixture, then add water and water reducer to the mixer in turn, and continue stirring at this speed for 5min to prepare To obtain high-performance concrete with low glue and high fluidity.

[0051] The water reducer is a polycarboxylate water reducer, and the gravel is blended from two grades of materials with a particle size of 5mm and 10mm in a weight ratio of 1:1.

[0052] The cementitious material is made by the following methods:

[0053] Step S1. Add acrylic acid and p...

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Abstract

The invention discloses high-flowability high-performance concrete with a low cementing material content, and a preparation method thereof. The high-flowability high-performance concrete with the lowcementing material content comprises the following raw materials in parts by weight: 520-570 parts of a cementing material, 626-702 parts of medium sand, 1061-1152 parts of broken stone, 130-140 partsof water and 4.88-8.67 parts of a water reducing agent. The preparation method comprises the following steps: adding the medium sand, the broken stone and the cementing material into a stirrer, carrying out stirring for 0.5-1.5 min at a rotating speed of 40-60 r / min to prepare a mixture, sequentially adding the water and the water reducing agent into the stirrer, and continuing stirring for 3-5 min at the rotating speed to prepare the high-flowability high-performance concrete with the low cementing material content. The concrete has high flowability, does not need to be vibrated, can pass through a steel bar dense area by means of dead weight, reduces concrete quality defects caused by incapability of vibrating or uncompacted vibration compared with common concrete, and realizes high flowability and high performance of the concrete under the condition of a low use amount of the cementing material.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, and specifically relates to a low-glue, high-fluidity high-performance concrete and a preparation method thereof. Background technique [0002] In recent years, highways and various infrastructures have been in a high-speed construction period, and the structural complexity brought about by actual working conditions and technological innovations has also put forward high requirements for concrete performance. In order to solve the problem that it is difficult or impossible to carry out vibrating operations (such as too dense steel bars or complex structures, etc.), improve the durability of concrete structures, reduce the impact of construction noise on the environment and solve problems such as labor shortages, technical workers have proposed high The concept of fluid concrete. Several technologies are currently applied: one is to improve the fluidity of concrete by increasing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/023C04B28/04C04B2201/50C04B2201/52C04B18/08C04B18/141C04B14/02C04B14/06C04B2103/302
Inventor 刘刚亮王中文付浩兵唐博学周志鸿厉天晗王辉李明少
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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