Preparation method of CFRP cloth constrained hybrid fiber lightweight aggregate concrete

A lightweight aggregate concrete and hybrid fiber technology, applied in the direction of chemical instruments and methods, laminated, layered products, etc., can solve problems such as deficiencies, achieve the effects of reducing shrinkage cracks, improving crack resistance, and improving compressive strength

Inactive Publication Date: 2019-07-09
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, so far, the research on the combination of CFRP cloth and hybrid fiber applied to lightweight aggregate concrete columns to improve its performance is lacking.

Method used

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  • Preparation method of CFRP cloth constrained hybrid fiber lightweight aggregate concrete
  • Preparation method of CFRP cloth constrained hybrid fiber lightweight aggregate concrete
  • Preparation method of CFRP cloth constrained hybrid fiber lightweight aggregate concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] See figure 1 , A hybrid fiber lightweight aggregate concrete constrained by CFRP cloth, according to 42.5 ordinary Portland cement 100, fly ash 8, silica fume 6, water reducing agent 0.4, light aggregate 120, sand 150, steel fiber 30, The weight ratio of polypropylene fiber 6 and water 30 is weighed as raw materials. After stirring, the test piece was formed. After 48 hours, the mold was removed and placed in a standard curing room with a temperature of 20±3°C and a relative humidity greater than 90% for curing. The test piece was taken out after 28 days.

Embodiment 2

[0038] See figure 1 with figure 2 , A hybrid fiber lightweight aggregate concrete constrained by CFRP cloth, according to 42.5 ordinary Portland cement 100, fly ash 8, silica fume 6, water reducing agent 0.4, light aggregate 120, sand 150, steel fiber 30, The weight ratio of polypropylene fiber 6 and water 30 is weighed as raw materials. After stirring, the test piece was formed. After 48 hours, the mold was removed and placed in a standard curing room with a temperature of 20±3°C and a relative humidity greater than 90% for curing. After 28 days, the test piece was taken out and covered with a CFRP cloth.

Embodiment 3

[0040] The preparation method of the present invention is as follows:

[0041] Step 1: Take 100 parts of 42.5 grade concrete cement, 5 parts of grade I fly ash, 4 parts of silica fume, 0.1 part of powdered naphthalene-based water reducing agent and 100 parts of light aggregate according to the mass parts and dry mix to obtain a mixture A;

[0042] Step 2: Add 20 parts of water to the mixture A and stir evenly to obtain the mixture B;

[0043] Step 3: Add 130 parts of sand, 10 parts of steel fiber and 1 part of polypropylene fiber to Mixture B, stir evenly to obtain Mixture C;

[0044] Step four, mold the mixture C into a mold, and after the mixture C is dried, remove the mold to obtain a test piece;

[0045] Step 5, curing the test piece, the curing conditions are temperature 20±3℃, relative humidity greater than 90%, curing in the curing room, after curing, it will be used as the concrete matrix;

[0046] Step 6: Paste the CFRP cloth on the concrete matrix to complete the hybrid fiber ...

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Abstract

The invention discloses a preparation method of CFRP cloth constrained hybrid fiber lightweight aggregate concrete. The method provided by the invention combines a CFRP cloth, hybrid fibers and lightweight aggregate concrete, fully exerts lateral restraint ability of the CFRP and a good toughing effect of the hybrid fibers, and comprehensively improves the compressive strength, ductility and splitting strength of the concrete; and when the method is applied to a project, the quality, durability and service life of the project are greatly improved, and the method brings good economic and socialbenefits.

Description

Technical field [0001] The invention belongs to the field of structural engineering and is a method for preparing hybrid fiber lightweight aggregate concrete constrained by CFRP cloth. Background technique [0002] Lightweight aggregate concrete has light weight, high strength, good thermal insulation performance and high durability. The high fire resistance and other characteristics give it superior technical and economic advantages in the application of major projects. It is a building material with good prospects and has been widely used in high-rise buildings, bridge engineering and other fields. Applying it to the column can effectively reduce the weight of the structure, reduce the seismic response, reduce the cross-sectional size, etc., but the lightweight aggregate concrete has low elastic modulus, prominent ductility problems, and shear failure, which greatly limits its development and use. [0003] Studies have shown that adding fibers to lightweight aggregate concrete ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/00B32B37/12
CPCB32B37/1284B32B2307/552B32B2307/554B32B2307/558B32B2307/718C04B28/00C04B28/04C04B2111/00612C04B2201/50C04B18/08C04B18/146C04B2103/302C04B18/027C04B14/068C04B14/48C04B16/0633C04B24/226
Inventor 吴涛魏慧刘喜杨雪陈顺张润孙俐欣
Owner CHANGAN UNIV
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