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Steel fiber modified PVA fiber reinforced cement-based composite material and preparation method thereof

A fiber-reinforced cement and composite material technology, applied in the field of building materials, can solve the problems of slow hydration speed, achieve the effects of reducing cohesive force, improving early strength, and reducing early shrinkage and creep

Active Publication Date: 2020-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to make its toughness good, the workability of hybrid fiber cement-based materials is often improved by adding fly ash, but because the hydration speed of fly ash is very slow, the early strength of the material will decrease after adding fly ash. Therefore, it is necessary to use an early-strength agent with better effect, and adopt the method of organic-inorganic composite early-strength agent to greatly improve the early strength of the matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Mix 450 parts of sulphoaluminate cement, 440 parts of sand, 500 parts of gravel, 85 parts of ground slag, and 40 parts of fly ash and stir for 3 to 5 minutes to obtain the first mixture;

[0021] 2. Add 2 parts of high-efficiency water reducer and 1 part of composite early strength agent to 190 parts of mixing water, and mix evenly to obtain the second mixture;

[0022] 3. Add the second mixture obtained in step 2 to the first mixture obtained in step 1, mix thoroughly and stir for 3 to 5 minutes to obtain the third mixture;

[0023] 4. Use a syringe to extract 0.3 parts of amino silicone oil, evenly spray it on 3 parts of PVA fiber, and further make the amino silicone oil more evenly dispersed by hand;

[0024] 5. Add 3 parts of treated PVA fiber and 70 parts of steel fiber to the third mixture obtained in step 3, and stir at high speed for 3 minutes to obtain steel fiber modified PVA fiber reinforced cement-based composite material.

[0025] The steel fiber modifi...

Embodiment 2

[0027] 1. Mix 500 parts of sulphoaluminate cement, 625 parts of sand, 831 parts of gravel, 123 parts of ground slag, and 56 parts of fly ash and stir for 3 to 5 minutes to obtain the first mixture;

[0028] 2. Add 2.5 parts of high-efficiency water reducer and 1.2 parts of composite early strength agent to 217 parts of mixing water, and mix well to obtain the second mixture;

[0029] 3. Add the second mixture obtained in step 2 to the first mixture obtained in step 1, mix thoroughly and stir for 3 to 5 minutes to obtain the third mixture;

[0030] 4. Use a syringe to extract 0.5 parts of amino silicone oil, evenly spray it on 5 parts of PVA fiber, and further make the amino silicone oil more evenly dispersed by hand;

[0031] 5. Add 5 parts of treated PVA fiber and 95 parts of steel fiber to the third mixture obtained in step 3, and stir at high speed for 3 minutes to obtain a steel fiber modified PVA fiber reinforced cement-based composite material.

[0032] The steel fiber ...

Embodiment 3

[0034] 1. Mix 650 parts of sulfoaluminate cement, 810 parts of sand, 830 parts of gravel, 1500 parts of ground slag, and 65 parts of fly ash and stir for 3 to 5 minutes to obtain the first mixture;

[0035] 2. Add 5 parts of high-efficiency water reducer and 2 parts of early strength agent into 300 parts of mixing water, and mix well to obtain the second mixture;

[0036] 3. Add the second mixture obtained in step 2 to the first mixture obtained in step 1, mix thoroughly and stir for 3 to 5 minutes to obtain the third mixture;

[0037] 4. Extract 0.6 parts of amino silicone oil with a syringe, evenly spray it on 6 parts of PVA fiber, and further make the dispersion of amino silicone oil more uniform by hand;

[0038] 5. Add 6 parts of treated PVA fiber and 110 parts of steel fiber to the third mixture obtained in step 3, and stir at high speed for 3 minutes to obtain a steel fiber modified PVA fiber reinforced cement-based composite material.

[0039] The steel fiber modified P...

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Abstract

The invention discloses a steel fiber modified PVA fiber reinforced cement-based composite material and a preparation method thereof.The steel fiber modified PVA fiber reinforced cement-based composite material comprises the following components in parts by weight:450-650 parts of sulphoaluminate cement,190-300 parts of water,440-670 parts of sand,500-830 parts of crushed stone,85-150 parts of ground slag,40-65 parts of fly ash,3-6 parts of a PVA fiber,70-110 parts of a steel fiber,2-5 parts of a high-efficiency water reducing agent and 0-2 parts of an early strength agent.Compared with thesingle early strength agent, anorganic-inorganic composite early strength agent has good economic benefit, the early strength enhancement rate may achieve or exceed the superposition of the strength enhancement rates when the components are used alone, and more obvious economic and technical effects are obtained.The steel fiber is provided with an end hook, so that the bonding strength is high, the main pulling force can be borne after cracks are generated, and a large amount of energy can be absorbed.The mixed use of the two fibers can play a role in different layers, generate synergistic effect, jointly prevent crack propagation and enhance the toughness of concrete.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a steel fiber modified PVA fiber reinforced cement-based composite material and a preparation method thereof. Background technique [0002] As the most widely used structural form today, reinforced concrete structures are widely used in various construction projects such as houses, bridges, roads, and dams. According to reports, the annual output of concrete worldwide reaches about 25 billion tons. Concrete is a brittle material with high compressive strength and low tensile strength. In response to this, fibers are added to the concrete to increase the toughness of the concrete. At present, single-mixed concrete is widely used, but in the actual application process, due to the limitations of workability, strength, toughness, durability and economic cost, single-mixed fiber reinforced concrete has certain limitations and disadvantages. The incorporation of hybrid fibers can n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06
Inventor 卢亦焱刘真真梁鸿骏王思雨李晓军胡霁月赵晓博
Owner WUHAN UNIV
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