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Multi-dimension polypropylene fiber concrete

A technology of polypropylene fiber and concrete, which is applied in the field of concrete to achieve the effects of improving fracture performance, frost resistance, compression resistance and splitting performance

Active Publication Date: 2017-05-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throughout the research status of fiber-reinforced concrete, most of them use single-mixing or mixing two kinds of fibers with different elastic modulus, and there are few reports on the optimal fiber content of multi-size polypropylene fiber-reinforced concrete.

Method used

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  • Multi-dimension polypropylene fiber concrete
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  • Multi-dimension polypropylene fiber concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1. Compressive and split tensile strength test of concrete

[0042] This test uses a 100mm×100mm×100mm cube non-standard specimen. The measured uniaxial compressive strength values ​​should be multiplied by a size conversion factor of 0.95, and the split tensile strength value should be multiplied by a size conversion factor of 0.85.

[0043] The uniaxial compressive strength of concrete is shown in Table 3 and figure 1 As shown, the splitting tensile strength is shown in Table 4 and figure 2 Shown:

[0044] Table 3 Record table of determination of uniaxial compressive strength of concrete

[0045]

[0046]

[0047] Table 4 Record table of concrete splitting tensile strength measurement

[0048]

[0049] From Table 3, Table 4, figure 1 with figure 2 It can be seen that: Compared with plain concrete, the compressive and splitting tensile strength of concrete mixed with fiber are improved, the compressive strength is increased by 2% to 63.5%, the tensile strength is incre...

Embodiment 2

[0053] Example 2: Concrete freeze-thaw cycle test

[0054] The uniaxial compressive strength of concrete after 200 freeze-thaw cycles is shown in Table 5 and image 3 As shown, the splitting tensile strength is shown in Table 6 and Figure 4 Shown:

[0055] Table 5 Record table of determination of uniaxial compressive strength of concrete after freezing and thawing

[0056]

[0057] Table 6 Record table of determination of split tensile strength of concrete after freezing and thawing

[0058]

[0059] From Table 5, Table 6, image 3 with Figure 4 It can be seen that the addition of fiber improves the compressive and split tensile strength of concrete after freezing and thawing, and the compressive strength is increased by 3.0% to 85.0%, and the tensile strength is increased by 8.2% to 42.0%; and A0 D In comparison, the addition of polypropylene fine fiber alone improves the compression and splitting tensile strength of concrete after freezing and thawing, while the single addition of ...

Embodiment 3

[0072] Example 3 Three-point bending load test of concrete notched beam

[0073] The concrete fracture energy obtained by the three-point bending load test of the concrete notched beam is shown in Table 9 and Picture 9 Shown:

[0074] Table 9 Test results of concrete fracture energy

[0075]

[0076] From Table 9 and Picture 9 It can be seen that the incorporation of fibers can greatly increase the fracture energy of concrete. Compared with plain concrete, the fracture energy is increased by 46.8% to 237.6%. Among them, the A1 sample with polypropylene fine fiber has the least increase, which is 46.8%. , And multi-size polypropylene fiber concrete A8 specimens increased the most, 237.6%; multi-size polypropylene fiber concrete A7, A8 specimens, from the results can be seen, under the same total content of the same conditions, the proportion of fine fiber The fracture energy of the A8 specimen was 48.3% higher than that of the A7 specimen. Among the concrete specimens A1 to A8 mixe...

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Abstract

The invention relates to multi-dimension polypropylene fiber concrete, which is formed by a polypropylene fiber, a concrete and a water reducing agent, wherein the polypropylene fiber is a fascicular monofilament polypropylene fiber formed by FF1, FF2 and CF1; the FF1 and the FF2 are polypropylene fine fibers with the diameters being 0.026mm and 0.10mm respectively and the lengths being 19mm; the CF1 is a polypropylene coarse fiber with the diameter being 0.8mm and the length being 50mm; the mixing amount of the FF1 ranges from 0.50 to 0.65kg / m<3>, the mixing amount of the FF2 ranges from 0.50 to 0.65kg / m<3>, and the mixing amount of the CF1 ranges from 4.0 to 5.0kg / m<3>. The multi-dimension polypropylene fiber is added into a cement base according to the mixing amount so as to obtain the multi-dimension polypropylene fiber concrete, and compared with the prior art, the uniaxial compression and the splitting tensile strength of the concrete can be remarkably improved, the freezing-thawing durability of the concrete can be effectively improved, and the fracture property of the concrete can be greatly improved.

Description

Technical field [0001] The invention belongs to the field of concrete, and specifically relates to a multi-size polypropylene fiber concrete. Background technique [0002] Concrete is usually an artificial stone made of cement, granular aggregate, water, chemical admixtures and mineral admixtures (mineral admixtures) in appropriate proportions, uniformly mixed, compacted, and cured. It has a source of raw materials. The characteristics of wide range, low price, excellent mechanical properties, and simple production process have become the most widely used civil engineering materials in contemporary times. [0003] Polypropylene fiber is a synthetic fiber made by spinning isotactic polypropylene as a raw material. It is the lightest variety among chemical fibers; its strength is 35~62cN / dtex; its abrasion resistance is second only to polyamide fiber; its corrosion resistance is good. , Especially good stability to inorganic acid and alkali. [0004] With the rapid development of mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06C04B111/34
CPCC04B16/0633C04B28/04C04B2111/343C04B2201/50C04B14/06C04B14/02C04B22/002C04B24/24
Inventor 梁宁慧缪庆旭刘新荣胡杨钟杨代继飞杨鹏郭哲奇
Owner CHONGQING UNIV
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