A kind of ultra-high performance concrete with low shrinkage and high elastic modulus and preparation method thereof

An ultra-high-performance and high-elasticity technology, applied in the field of concrete, can solve the problems of high cost and large shrinkage of ultra-high-performance concrete, and achieve the effect of reducing cement consumption, reducing section size and component quality, and improving elastic modulus

Active Publication Date: 2022-05-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a low-shrinkage, high-elastic-modulus ultra-high-performance concrete and a preparation method thereof in order to solve the technical problems of large shrinkage and high cost of the existing ultra-high-performance concrete, and enhance the level of resistance to deformation

Method used

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  • A kind of ultra-high performance concrete with low shrinkage and high elastic modulus and preparation method thereof
  • A kind of ultra-high performance concrete with low shrinkage and high elastic modulus and preparation method thereof
  • A kind of ultra-high performance concrete with low shrinkage and high elastic modulus and preparation method thereof

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Effect test

Embodiment 1

[0038] Example 1: A low-shrinkage, high-elastic-modulus ultra-high-performance concrete of this example consists of 36 parts by mass of cement, 0 part of silica fume, 0 part of fly ash, 15 parts of river sand, and high-standard gravel 200 parts of superplasticizer, 0.6 parts of high-efficiency water reducing agent, 2.7 parts of arcuate copper-plated steel fiber and 6.5 parts of water. The proportion is ≤3wt%, and the diameter of the arcuate copper-coated steel fiber is 0.2mm, and the length is 15mm.

Embodiment 2

[0039] Embodiment 2: A kind of ultra-high performance concrete with low shrinkage and high modulus of elasticity of the embodiment consists of 23.7 parts by mass of cement, 1.8 parts of silica fume, 10.8 parts of fly ash, 15 parts of river sand, and 200 parts of high-standard gravel 0.7 parts of high-efficiency superplasticizer, 2.7 parts of arc-shaped copper-plated steel fibers and 5.9 parts of water. The elastic modulus of the high-standard crushed stones is ≥60GPa, and the needle-shaped and flaky crushed stones in the high-standard crushed stones account for Ratio≤3wt%, the arcuate copper-coated steel fiber has a diameter of 0.2mm and a length of 15mm.

Embodiment 3

[0040] Embodiment 3: A kind of ultra-high performance concrete with low shrinkage and high modulus of elasticity of the embodiment consists of 23.5 parts of cement, 0 parts of silica fume, 12.6 parts of fly ash, 15 parts of river sand, and 200 parts of high-standard crushed stone in parts by mass. 1 part, 0.5 part of high-efficiency water reducer, 2.8 parts of bow-shaped copper-plated steel fiber and 6.1 parts of water. Ratio≤3wt%, the arcuate copper-coated steel fiber has a diameter of 0.2mm and a length of 15mm.

[0041] The preparation method of the ultra-high performance concrete with low shrinkage and high elastic modulus of preparation embodiment 1-3 is carried out as follows:

[0042] Step 1: Mix water and high-efficiency superplasticizer in advance to obtain an aqueous solution of superplasticizer;

[0043] Step 2: Pour cement and river sand into the mixer in turn and mix and stir for 5 minutes, add water reducer aqueous solution and continue stirring for 3 minutes, t...

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Abstract

An ultra-high-performance concrete with low shrinkage and high elastic modulus and a preparation method thereof. The invention belongs to the field of concrete. The invention aims to solve the technical problems of large shrinkage and high cost of the existing ultra-high performance concrete, and improves the modulus of elasticity and enhances the level of resistance to deformation. The low-shrinkage and high-elastic-modulus ultra-high-performance concrete of the present invention is prepared from cementitious material, sand, coarse aggregate, water reducing agent, bow-shaped copper-plated steel fiber and water in parts by mass. The method of the present invention: first pour the cementitious material and sand into the mixer for mixing and stirring, then add the pre-mixed uniform water reducer and water to continue stirring, then slowly add the bow-shaped copper-plated steel fiber, and then stir to obtain mortar; pour an appropriate amount of mortar Put it into the mold, then add an appropriate amount of coarse aggregate, and use a spatula to press the coarse aggregate into the mortar, repeat the process until the entire mold is filled; then steam curing to obtain concrete. The invention has good economic efficiency, small shrinkage and high level of resistance to deformation.

Description

technical field [0001] The invention belongs to the field of concrete, and in particular relates to ultra-high-performance concrete with low shrinkage and high elastic modulus and a preparation method thereof. Background technique [0002] my country consumes a large amount of energy for infrastructure construction every year. In 2020, my country's cement output will reach 2.38 billion tons, ranking first in the world in energy consumption. Under the guidance of the goal of "carbon peak, carbon neutrality", it is necessary to innovate and upgrade traditional building materials to achieve efficient use of resources and energy. Ultra-high performance concrete is widely welcomed in the market because of its high strength, high toughness, high durability and high impact resistance. However, if the amount of cementitious materials is too much, it will not only shrink greatly, easily cause cracking, but also consume a lot of energy. , does not conform to the concept of green deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B40/00B28B13/02
CPCC04B28/00C04B40/0028B28B13/02C04B18/08C04B18/146C04B18/141C04B14/106C04B14/06C04B14/02C04B2103/302C04B14/48
Inventor 肖会刚董宪章张圣金
Owner HARBIN INST OF TECH
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