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Ultra-high performance concrete material containing coarse aggregates and preparation method of ultra-high performance concrete material

An ultra-high performance, coarse aggregate technology, applied in the field of concrete materials, can solve the problems of self-heavy, low cracking stress, poor bending fatigue performance, etc., and achieve the effects of high durability, high elastic modulus, and high crack resistance.

Inactive Publication Date: 2017-12-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The purpose of this invention is to provide a kind of ultra-high performance concrete material containing coarse aggregate and its preparation method. The concrete material has four characteristics of high strength, high elastic modulus, high crack resistance and high bending fatigue performance. It solves the problems of self-heaviness, low cracking stress, low stiffness and poor bending fatigue performance caused by the use of traditional concrete materials in the existing large-scale bridge deck engineering

Method used

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  • Ultra-high performance concrete material containing coarse aggregates and preparation method of ultra-high performance concrete material
  • Ultra-high performance concrete material containing coarse aggregates and preparation method of ultra-high performance concrete material
  • Ultra-high performance concrete material containing coarse aggregates and preparation method of ultra-high performance concrete material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A coarse aggregate dosage of 280kg / m 3 The ultra-high performance concrete material, its specific preparation method is as follows:

[0037] 1. Weigh the raw materials according to the following ratio:

[0038]

[0039] 2. Add the cement and the admixture together into a mixer with a stirring rate of 60rmp, and stir for about 30s until they are evenly dispersed. The admixture is composed of silica fume, slag and microbead particles, and silica fume accounts for Add 40% of the total mass of the admixture, then add sand and aggregate, and continue dry stirring for 1 minute; stir 70wt% water and all water reducers in the container evenly, slowly add to the mortar mixture that is being stirred, and stir for 30s , then add the remaining 30wt% of water, and continue to stir for 3 minutes; scatter the steel fibers evenly in 4 times, and stir for about 4 minutes until the steel fibers are evenly dispersed, and the ultra-high performance concrete material containing coarse a...

Embodiment 2

[0054] A coarse aggregate dosage of 400kg / m 3 The ultra-high performance concrete material, its specific preparation method is as follows:

[0055] 1. Weigh the raw materials according to the following ratio:

[0056]

[0057] 2. Add the cement and the admixture together into a mixer with a stirring rate of 40rmp and stir for about 30s until they are evenly dispersed. The admixture is composed of three materials: silica fume, slag and microbeads, and silica fume accounts for 50% of the total mass of the aggregate, then add sand and aggregate, and continue dry stirring for 1.5 minutes; stir 60wt% water and all water reducers in the container evenly, slowly add it to the mortar mixture that is being stirred, and stir for 60s , then add the remaining 40wt% of water, and continue stirring for 2.5 minutes; evenly sprinkle steel fibers in 5 times, stir for about 4 minutes until the steel fibers are evenly dispersed, and obtain ultra-high performance concrete materials containing...

Embodiment 3

[0060] A coarse aggregate dosage of 480kg / m 3The ultra-high performance concrete material, its specific preparation method is as follows:

[0061] 1. Weigh the raw materials according to the following ratio:

[0062]

[0063]

[0064] 2. Add the cement and the admixture together into the mixer with a stirring rate of 50rmp, and stir for about 30s until the dispersion is uniform. The admixture is composed of three materials: silica fume, slag and microbead particles, and silica fume occupies Add 60% of the total mass of the admixture, then add sand and aggregate, and continue dry stirring for 1.2 minutes; stir 65wt% water and all the water reducer in the container, slowly add it to the mortar mixture that is being stirred, and stir 45s, then add the remaining 35wt% of water, and continue to stir for 2.5 minutes; sprinkle steel fibers evenly in 6 times, stir for about 4 minutes until the steel fibers are evenly dispersed, and obtain ultra-high performance concrete materia...

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Abstract

The invention discloses an ultra-high performance concrete material containing coarse aggregates and a preparation method of the ultra-high performance concrete material. The material is mainly prepared from cement, water, a water reducing agent, admixture, sand, the coarse aggregates and steel fibers. The ultra-high performance concrete material containing the coarse aggregates is prepared according to the following steps: firstly, weighing all the raw materials according to the proportions; secondly, adding the cement and the admixture into a mixer, uniformly stirring, then adding the sand and the coarse aggregates, and carrying out dry mixing to obtain a mortar mixture; thirdly, uniformly stirring part of water and all the water reducing agent in advance, then adding the mixture into the mortar mixture for stirring, and adding residual water to obtain mixed slurry; fourthly, spreading the steel fibers into the mixed slurry, and uniformly stirring to obtain the ultra-high performance concrete material containing the coarse aggregates. The ultra-high performance concrete material containing the coarse aggregates has the advantages of good flowing property, high strength, high elastic modulus, high bending resistance and excellent fatigue property.

Description

technical field [0001] The invention relates to an ultra-high-performance concrete material containing coarse aggregate and a preparation method thereof, belonging to the field of concrete materials. Background technique [0002] Since the 20th century, with the rapid development of social economy, bridge structures have developed towards higher and longer directions, which put forward new requirements for the performance of concrete materials. In order to solve the problems of concrete bridge decks such as heavy weight, low cracking stress, low stiffness and poor bending fatigue performance, it is urgent to invent a concrete material with high strength, high crack resistance, high elastic modulus and high bending fatigue performance. [0003] Reactive powder concrete (RPC) material meets the requirements of high strength, high crack resistance and high durability in terms of performance due to its strict requirements on raw materials and special molding process, but it is d...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/20C04B111/34
Inventor 刘加平程俊
Owner SOUTHEAST UNIV
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