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Steel-PVA hybrid fiber reinforced concrete waterproof impervious material and preparation method thereof

A technology for reinforcing concrete and hybrid fibers, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc. Non-uniform fiber dispersion and other problems, to achieve good self-waterproof effect, improve the generation of internal defects and micro-cracks, improve efficiency and quality

Active Publication Date: 2022-06-07
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fiber-doped concrete has problems such as difficult mix ratio trial mixing, uneven dispersion of various fibers, fine-tuning of the proportion of mixed fibers has a great influence on the performance of the matrix, and negative mixing effects between fibers, etc., which will have a certain impact on the bending toughness of the material. , which is not conducive to the pouring of large-volume concrete; especially the waterproof and impervious properties of fiber-doped concrete materials are still not ideal, which limits its application to a certain extent

Method used

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  • Steel-PVA hybrid fiber reinforced concrete waterproof impervious material and preparation method thereof
  • Steel-PVA hybrid fiber reinforced concrete waterproof impervious material and preparation method thereof
  • Steel-PVA hybrid fiber reinforced concrete waterproof impervious material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A C30 grade steel-PVA hybrid fiber reinforced concrete material, each raw material is prepared according to the C30 formula shown in Table 1 and the fiber type and volume ratio shown in Table 2, and the preparation method is as follows:

[0051] Step 1: Add cement, fly ash and sand in turn and stir to mix evenly to obtain the first product;

[0052] Step 2: adding coarse aggregate to the first product and stirring for 30s to obtain the second product;

[0053] Step 3: adding the dissolved water reducing agent to the second product, stirring for 30s to obtain the third product;

[0054] Step 4: adding an expansion agent to the third product (the expansion agent adopts a high-efficiency anti-cracking expansion agent, and the amount thereof is 6% of the total weight of the cementitious material), and stirs for 30s to obtain the fourth product;

[0055] Step 5: while maintaining the stirring state, add steel fibers and PVA fibers to the fourth product, and continue stirrin...

Embodiment 2

[0057] A C40 grade steel-PVA hybrid fiber reinforced concrete material, each raw material component is prepared according to the C40 formula shown in Table 1 and the fiber types and volume ratios shown in Table 2, and the preparation method is as follows:

[0058] Step 1: Add cement, fly ash and sand in turn and stir to mix evenly to obtain the first product;

[0059] Step 2: adding coarse aggregate to the first product and stirring for 30s to obtain the second product;

[0060] Step 3: adding the dissolved water reducing agent to the second product, stirring for 30s to obtain the third product;

[0061] Step 4: adding an expansion agent to the third product (the expansion agent adopts a high-efficiency anti-cracking expansion agent, and the amount thereof is 8% of the total weight of the cementitious material), and stirs for 30s to obtain the fourth product;

[0062] Step 5: while maintaining the stirring state, add steel fibers and PVA fibers to the fourth product, and cont...

Embodiment 3

[0064] On the basis of Example 1, according to the fiber volume ratio shown in Table 2, the content of steel fibers was adjusted to 1.25% (volume percent), the content of PVA fibers was adjusted to 0.75% (volume percent), and the remaining steps and conditions remain unchanged.

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Abstract

The invention provides a steel-PVA hybrid fiber reinforced concrete waterproof impervious material, which is prepared from the following components in parts by weight: 1000 to 1300 parts of coarse aggregate, 600 to 830 parts of fine aggregate, 310 to 430 parts of cement aggregate, 0 to 80 parts of fly ash, 32 to 60 parts of expanding agent, 2 to 5 parts of water reducing agent and 150 to 250 parts of water, the steel fiber accounts for 1.18-1.29% of the total volume of the components, and the PVA fiber accounts for 0.71-0.82% of the total volume of the components. By selecting the types of the steel fibers and the PVA fibers and setting a reasonable proportion, the concrete material is endowed with good bending toughness, mass concrete pouring is facilitated, the waterproof and anti-permeability performance of the concrete material is also remarkably improved, and a concrete structure has a certain self-waterproof effect. The steel-PVA hybrid fiber reinforced concrete waterproof impervious material provided by the invention is simple in preparation process and excellent in comprehensive performance, and is very suitable for popularization and application in waterproof building engineering construction and building structure reinforcement and repair.

Description

technical field [0001] The invention belongs to the technical field of fiber reinforced concrete materials, and in particular relates to a steel-PVA hybrid fiber reinforced concrete waterproof and impermeable material and a preparation method thereof. Background technique [0002] Fiber reinforced concrete is a new type of building material. Adding fibers can improve the overall mechanical properties and durability of concrete materials. It has high strength, deformation capacity and energy dissipation capacity. Therefore, it is widely used in important facilities such as highways, bridges, airport runways, etc. under construction. [0003] Traditional fiber reinforced concrete usually uses a single fiber type, and a single fiber often only works under limited strain and cracking conditions. At the same time, its own disadvantages cannot be avoided, such as steel fiber corrosion, nylon fiber cannot resist micro cracks in the early stage, etc. The use of two or more differen...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B111/27C04B111/34C04B111/72
CPCC04B28/02C04B2201/50C04B2111/27C04B2111/00293C04B2111/343C04B2111/72C04B2111/723C04B18/08C04B14/06C04B14/02C04B14/48C04B16/0641C04B2103/0068C04B2103/302Y02W30/91
Inventor 郑辉田红云王震张路路
Owner CHINA FIRST METALLURGICAL GROUP
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