High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof

A low shrinkage, high ductility technology, applied in the field of high crack resistance, low shrinkage and high ductility mortar, can solve the problems of ECC selection and performance defects, high cost performance, etc., to achieve the effect of being conducive to dispersion, improving cost performance and improving fluidity

Active Publication Date: 2014-01-01
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The present invention proposes a high-crack-resistant, low-shrinkage, high-ductility mortar and it...

Method used

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  • High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof
  • High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof
  • High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Mixing ratio:

[0037] See Table 2 for specific ratios.

[0038] 2. Preparation method:

[0039] 1) Pour the accurately weighed cement, fly ash, fine aggregate, limestone powder, and thickener into the mixer, and dry mix for 2 minutes until evenly mixed;

[0040] 2) Add 80% of the water dissolved in the water reducing agent into the dry powder, and wet mix for 2 minutes until a slurry with suitable fluidity and cohesion is formed;

[0041] 3) Add artificially pre-dispersed polyvinyl alcohol fibers into the slurry, and wet mix for 4 minutes until the fibers are evenly dispersed in the slurry;

[0042] 4) Add the remaining 20% ​​water into the slurry, and mix for another 2 minutes. After the end, turn off the power of the mixer, and pour the evenly mixed slurry into the mold.

[0043] 3. Maintenance system:

[0044] After 1 day of mold curing under natural conditions, demould, put the specimen into a standard curing room (temperature 20±2°C, relative humidity ≥90%)...

Embodiment 2

[0050] 1. Mixing ratio:

[0051] See Table 2 for specific ratios.

[0052] 2. Preparation method:

[0053] 1) Pour the accurately weighed cement, fly ash, fine aggregate, limestone powder, and thickener into the mixer, and dry mix for 3 minutes until the mixture is uniform;

[0054] 2) Add 90% of the water dissolved in the water reducing agent into the dry powder, and wet mix for 3 minutes until a slurry with suitable fluidity and cohesiveness is formed;

[0055] 3) Add the artificially predispersed polyvinyl alcohol fibers into the slurry, and wet mix for 5 minutes until the fibers are evenly dispersed in the slurry;

[0056] 4) Add the remaining 10% water into the slurry, and mix for another 3 minutes. After the end, turn off the power of the mixer, and pour the evenly mixed slurry into the mold.

[0057] 3. Maintenance system:

[0058] After 1 day of mold curing under natural conditions, demould, put the specimen into a standard curing room (temperature 20±2°C, relative...

Embodiment 3

[0064] 1. Mixing ratio:

[0065] See Table 2 for specific ratios.

[0066] 2. Preparation method:

[0067] 1) Pour the accurately weighed cement, fly ash, fine aggregate, limestone powder, and thickener into the mixer, and dry mix for 2.5 minutes until evenly mixed;

[0068] 2) Add 85% of the water dissolved in the water reducing agent to the dry powder, and mix it wet for 2.5 minutes until a slurry with suitable fluidity and cohesiveness is formed;

[0069] 3) Add the artificially pre-dispersed polyvinyl alcohol fibers into the slurry, and wet mix for 4.5 minutes until the fibers are evenly dispersed in the slurry;

[0070] 4) Add the remaining 15% water into the slurry, and mix for another 2.5 minutes. After the end, turn off the power of the mixer, and pour the evenly mixed slurry into the mold.

[0071] 3. Maintenance system:

[0072] After 1 day of mold curing under natural conditions, demould, put the specimen into a standard curing room (temperature 20±2°C, relative...

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Abstract

The invention discloses a high-crack-resistance low-shrinkage high-ductility mortar and a preparation method thereof. The mortar comprises cement, fly ash, fine aggregate, limestone flour, water, polycarboxylic acid water reducing agent, polyvinyl alcohol fiber and thickener. The raw material proportion is reasonably adjusted to prepare the mortar with the fiber dispersion coefficient of higher than 0.90, which has different compression strengths (20-60 MPa), high ductility (the ratio of bending-compressive strength is greater than 0.30, the four point bending strength is greater than 10 MPa, the midspan deflection is greater than 16mm, and the bending toughness factor increases as the calculated midspan deflection value increases), high crack resistance (the circular ring anti-crack specimen does not crack under the curing conditions of temperature 23+/-2 DEG C and relative humidity 50+/-5% for 28 days, and the average stress rate is less than 0.1 MPa/day) and low shrinkage (the dry shrinkage is lower than 900 mu epsilon under the curing conditions of temperature 20+/-2 DEG C and relative humidity 60+/-5% for 28 days).

Description

technical field [0001] The invention relates to a high-crack-resistant, low-shrinkage, high-ductility mortar, which is a novel fiber-reinforced cement-based composite material. Background technique [0002] Cement-based material is one of the most widely used building materials at present. It is a typical "quasi-brittle material", which has the disadvantages of low flexural tensile strength, high brittleness, and easy cracking. In order to improve its toughness and other properties, Wu Zhongwei The academician proposed a "composite" technical approach based on the "super-stacking effect" of materials. The core of the "composite" technology is fiber reinforcement. With the development of the synthetic fiber industry, synthetic fibers are used to reinforce cement-based composite materials. The current development trend of fiber-reinforced cement-based composites. In 1992, Professor VictorCLi of the University of Michigan and Professor Leung of the Massachusetts Institute of T...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 郭丽萍张丽辉孙伟邓忠华邓忠林孙杨
Owner SOUTHEAST UNIV
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