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Anti-crack concrete and preparation method thereof

A technology of concrete and polypropylene fibers, applied in the field of concrete, can solve the problems of low compressive strength of concrete, decreased compressive strength, difficulty in meeting the needs of special projects, etc., so as to improve mechanical properties and durability, and improve adhesion. , enhance the effect of bonding

Inactive Publication Date: 2022-01-07
胡志强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The more expansion agent is added to the concrete, the cracks will be reduced and the impermeability will be improved. However, some studies have shown that the compressive strength of concrete will decrease significantly when the expansion agent is added to the concrete, resulting in the compressive strength of permeable high-strength asphalt concrete. Generally not high, it is difficult to meet the needs of special projects, so there is still room for improvement

Method used

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  • Anti-crack concrete and preparation method thereof
  • Anti-crack concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Raw material composition (parts by weight): 100 parts of water, 200 parts of Portland cement, 30 parts of epoxy resin modified polypropylene fiber, 10 parts of reinforcing fiber, 9 parts of calcium lignosulfonate water reducer, calcium aluminate expansion agent 7 parts, 30 parts of fly ash, 30 parts of coarse aggregate, 20 parts of fine aggregate, 0.1 part of sodium dioctyl succinic acid sulfonate. Coarse aggregate is crushed stone with a diameter of 10-20mm; fine aggregate is natural sand with a diameter of less than 5mm. The reinforcing fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber with a mass ratio of 3:3.

[0026] Epoxy resin modified polypropylene fiber is prepared by the following method:

[0027] S1. Add polypropylene fiber to ethanol solution containing 2wt% silane coupling agent, heat to 70°C, react for 1h, filter, and dry to obtain modified polypropylene fiber;

[0028] The silane coupling agent is a complex mixture of γ-aminopr...

Embodiment 2

[0032] Raw material composition (parts by weight): 150 parts of water, 400 parts of Portland cement, 50 parts of epoxy resin modified polypropylene fiber, 20 parts of reinforcing fiber, 14 parts of naphthalene-based water reducer, 10 parts of sulphoaluminate expansion agent , 70 parts of fly ash, 70 parts of coarse aggregate, 50 parts of fine aggregate, and 0.3 parts of sodium dioctyl succinic acid sulfonate. Coarse aggregate is crushed stone with a diameter of 10-20mm; fine aggregate is natural sand with a diameter of less than 5mm. The reinforcing fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber with a mass ratio of 3:5.

[0033] Epoxy resin modified polypropylene fiber is prepared by the following method:

[0034] S1. Add polypropylene fiber to ethanol solution containing 5wt% silane coupling agent, heat to 90°C, react for 2h, filter and dry to obtain modified polypropylene fiber;

[0035] The silane coupling agent is a complex mixture of γ-amin...

Embodiment 3

[0039]Composition of raw materials (parts by weight): 125 parts of water, 300 parts of Portland cement, 40 parts of epoxy resin modified polypropylene fiber, 15 parts of reinforcing fiber, 12 parts of polycarboxylate water reducer, 9 parts of alunite expansion agent, 50 parts of fly ash, 50 parts of coarse aggregate, 35 parts of fine aggregate, 0.2 part of sodium dioctyl succinic acid sulfonate. Coarse aggregate is crushed stone with a diameter of 10-20mm; fine aggregate is natural sand with a diameter of less than 5mm. The reinforcing fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber with a mass ratio of 3:4.

[0040] Epoxy resin modified polypropylene fiber is prepared by the following method:

[0041] S1. Add polypropylene fiber to ethanol solution containing 3.5wt% silane coupling agent, heat to 80°C, react for 1.5h, filter, and dry to obtain modified polypropylene fiber;

[0042] The silane coupling agent is a complex mixture of γ-aminopropyltr...

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Abstract

The invention provides anti-crack concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components in parts by weight: 100-150 parts of water, 200-400 parts of cement, 30-50 parts of epoxy resin modified polypropylene fiber, 10-20 parts of reinforced fiber, 9-14 parts of a water reducing agent, 7-10 parts of an expanding agent, 30-70 parts of fly ash, 30-70 parts of coarse aggregate, 20-50 parts of fine aggregate and 0.1-0.3 part of sodium dioctyl sulfosuccinate. In the anti-crack concrete, the modified polypropylene fibers are uniformly distributed in a concrete matrix, and the hydration reaction speed is increased by forming a fiber net structure, so that the crack resistance and impermeability of the concrete are remarkably improved, and the strength of the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a crack-resistant concrete and a preparation method thereof. Background technique [0002] Concrete is a building material. With the development of society, the use of concrete is increasing, and its application fields are becoming wider and wider. In order to meet the performance requirements of various application scenarios, there are more and more types of concrete. Among them , Permeable high-strength asphalt concrete is often used in occasions that require waterproofing and water resistance. [0003] Due to its structural characteristics, ordinary concrete will have a large number of capillary pores and small cracks, and it is not a completely dense structure. Therefore, ordinary concrete is prone to water seepage and has poor impermeability. In order to reduce capillary pores, expansion agents are usually added to the concrete , the concrete expansion agent is added to th...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/10C04B16/06C04B111/34
CPCC04B28/04C04B20/1051C04B16/0641C04B2111/343C04B2201/50C04B16/0633C04B2103/302C04B22/0093C04B22/064C04B22/148C04B18/08C04B18/12C04B14/068C04B24/16C04B20/1037
Inventor 胡志强
Owner 胡志强
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