Preparation method of high-ductility cement-based composite material

A composite material and cement-based technology, applied in the field of high ductility cement-based composite material preparation, can solve the problems of spalling and crushing, prone to brittle failure, low concrete tensile strength, etc., achieve good impact resistance and seismic characteristics, reduce settlement deformation Effect

Pending Publication Date: 2022-04-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength of concrete is low, and it is prone to brittle failure, such as spalling and crushing, when subjected to tensile stress.
Second, the durability of concrete

Method used

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  • Preparation method of high-ductility cement-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a high-ductility cement-based composite material, the steps are as follows:

[0020] Step 1: Add 480kg / m 2 Cement, 380kg / m 2 The fly ash and 1150kg / m sand are mixed and stirred evenly to obtain the mixture;

[0021] Step 2: Pour 1.5% water reducer into 150kg / m water and stir for 3-5 minutes. After the two are evenly dissolved, pour into the mixture and stir until it is in a fluid plastic state, then stop to obtain a wet mixture;

[0022] Step 3: Put the wet mixture in a model of 40mm*40mm*160mm, place the model on a vibrating device, vibrate and compact it, then let it stand for 24 hours, and then standardize it for 28 days to obtain a high-ductility cement-based composite material.

Embodiment 2

[0024] A method for preparing a high-ductility cement-based composite material, the steps are as follows:

[0025] Step 1: Add 480kg / m 2 Cement, 380kg / m 2 The fly ash and 1150kg / m sand are mixed and stirred evenly to obtain the mixture;

[0026] Step 2: Pour 1.5% water reducer into 150kg / m water and stir for 3-5 minutes. After the two are evenly dissolved, pour into the mixture and stir until it is in a fluid plastic state, then stop to obtain a wet mixture;

[0027] Step 3: Sprinkle 0.5% PVA fiber evenly into the wet mixture, and keep stirring until it is evenly fused to obtain the mixture;

[0028] Step 4: Put the mixture in a model of 40mm*40mm*160mm, place the model on a vibrating device, vibrate and compact it, then let it stand for 24 hours, and then standardize it for 28 days to obtain a superelastic SMA reinforced high ductility cement-based composite Material.

Embodiment 3

[0030] A method for preparing a high-ductility cement-based composite material, the steps are as follows:

[0031] Step 1: Add 480kg / m 2 Cement, 380kg / m 2 The fly ash and 1150kg / m sand are mixed and stirred evenly to obtain the mixture;

[0032] Step 2: Pour 1.5% water reducer into 150kg / m water and stir for 3-5 minutes. After the two are evenly dissolved, pour into the mixture and stir until it is in a fluid plastic state, then stop to obtain a wet mixture;

[0033] Step 3: Sprinkle 1.5% PVA fiber evenly into the wet mixture, and keep stirring until it is evenly fused to obtain the mixture;

[0034] Step 4: Put the mixture in a model of 40mm*40mm*160mm, place the model on a vibrating device, vibrate and compact it, then let it stand for 24 hours, and then standardize it for 28 days to obtain a superelastic SMA reinforced high ductility cement-based composite Material.

[0035] The overall performance of the high-ductility cement-based composite material in the above examp...

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Abstract

The invention discloses a preparation method of a high-ductility cement-based composite material, the high-ductility cement-based composite material comprises fly ash, cement, sand, water, a water reducing agent and PVA fiber, the fly ash is 380kg / m < 2 >, the cement is 480kg / m < 2 >, the sand is 1150kg / m, the water is 150kg / m, the water reducing agent is 1.5% and the PVA fiber is 0.5-1.5%, after a cementing material is uniformly stirred, the water reducing agent is placed in the water to be uniformly stirred, then the water reducing agent and a cementing mixture are fully stirred to be in a plastic flow state, and the high-ductility cement-based composite material is prepared. The high-ductility cement-based composite material provided by the invention has good shock resistance and shock resistance, the fibers in the high-ductility cement-based composite material can hinder expansion of internal fine traces, and settlement deformation is greatly reduced due to the high-elasticity characteristic of the high-ductility cement-based composite material.

Description

technical field [0001] The invention relates to a method for preparing a high-ductility cement-based composite material. Background technique [0002] Concrete is the most important and widely used building material in the world, and concrete is involved in various fields of civil engineering, including roads, bridges, buildings, etc. [0003] In practical engineering applications, concrete mainly has the following deficiencies: one is brittle failure under ultimate tensile load. The tensile strength of concrete is low, and it is prone to brittle failure, such as spalling and crushing, when subjected to tensile stress. The second is the durability of concrete. Durability problems caused by environmental factors such as concrete shrinkage, chemical erosion, and thermal effects. At the same time, the expanding cracks on the concrete surface will also greatly affect the durability of the structure and shorten the service life. In order to improve the seismic and impact resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/2053C04B2111/20C04B18/08C04B14/06C04B2103/302C04B16/0641
Inventor 范瑞凯
Owner WUHAN UNIV OF SCI & TECH
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