High performance steel-polypropylene hybrid fiber concrete
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A high-performance concrete, polypropylene fiber technology, applied in the field of concrete, can solve the problems of concrete reinforcement, toughening, limited crack resistance, etc., and achieve the effect of improving the tension-compression ratio
Inactive Publication Date: 2010-11-10
周健民
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Problems solved by technology
[0005] Therefore, the effect of adding a single fiber to concrete reinforcement, toughening and crack resistance is limited.
Method used
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Embodiment 1
[0013] Compressive strength test: The design scheme of orthogonal test is adopted. use L 18 (2 1 ×3 7 ) Orthogonal table. Steel fiber considers three factors: steel fiber volume ratio (three levels: 0.5%, 1.0%, 1.5%), steel fiber shape (two levels: corrugated and end hook shape), steel fiber aspect ratio (30, 50, 70); polypropylene fibers consider a factor that is the volume fraction of polypropylene fibers (three levels: 0.055%, 0.11%, 0.165%).
[0014] Mix ratio scheme of concrete matrix:
[0015]
[0016] The 150×150×150 concrete test block is supported according to the above mix ratio, and the compressive strength test is carried out. The test results are as follows.
[0017]
[0018] From the above test results, it can be seen that the maximum compressive strength is increased to 64.2Mpa, and the maximum increase is 23.2%. The average increase in compressive strength reached 12.2%.
Embodiment 2
[0020] Split tensile strength test: The design scheme of orthogonal test is adopted. use L 18 (2 1 ×3 7 ) Orthogonal table. Steel fiber considers three factors: steel fiber volume ratio (three levels: 0.5%, 1.0%, 1.5%), steel fiber shape (two levels: corrugated and end hook shape), steel fiber aspect ratio (30, 50, 70); polypropylene fibers consider a factor that is the volume fraction of polypropylene fibers (three levels: 0.055%, 0.11%, 0.165%).
[0021] Mix ratio scheme of concrete matrix:
[0022]
[0023] The 150×150×150 concrete block is supported according to the above mix ratio, and the split tensile strength test is carried out. The test results are as follows.
[0024]
[0025] From the above test results, it can be seen that the maximum value of split tensile strength is increased to 4.69Mpa, and the maximum increase rate is 40.0%. The average increase in compressive strength reached 23.8%.
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Abstract
The invention designs novel high performance fiber concrete in the field of building materials. Steel fibers and polypropylene fibers with low mixing quantity are added in original concrete. The volume ratio range of the steel fibers is 0.5-1.5 percent, and the volume ratio of polypropylene is 0.055-0.165 percent. Cement in the original concrete is C50, and the original concrete comprises the following components in percentage by weight: 16.8 percent of the cement, 32.2 percent of sands, 36.9 percent of pebbles, 8.2 percent of water, 5.7 percent of fly ash and 0.2 percent of water reducer. By adding the polypropylene, at the early stage, crack developing of the concrete is limited, and an internal structure of the concrete is improved; and the steel fibers limit and delay the occurrence and the development of a macroscopic crack at the later phase, are connected with parts of developed cracks and efficiently strength the intensity of the concrete. In addition, through coordination work of the three of the steel fibers, the polypropylene fibers and the original concrete, the positive hybrid effect is generated, the ductility, the toughness, the impermeability, the fatigue performance, the shrinkage and the creep of the concrete can be better improved, and excellent working performance is generated.
Description
technical field [0001] The present invention relates to a new type of concrete. Specifically, it is a high-performance hybrid fiber reinforced concrete mixed with steel fibers and polypropylene fibers, which belongs to the technical field of concrete. Background technique [0002] Ordinary concrete is generally composed of cement, sand, stones and water, which are formed and solidified after mixing evenly. The compressive strength of this cement without any additives can generally meet the actual needs of the project. However, its tensile strength, flexural strength, impact toughness and impermeability are relatively poor. In order to improve the performance of concrete, people are devoted to the research of high performance concrete. The raw materials used in high performance concrete include chemical admixtures and mineral admixtures in addition to the four major components of cement, sand, stone and water used in traditional concrete. The use of new superplasticizers ...
Claims
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