Abstract
Polypropylene fibre (PPF) is a kind of polymer material with light weight, high strength, and corrosion resistance. The crack resistance of concrete can be improved by adding PPFs. PPF can optimize the pore size distribution of concrete. As a result, the durability of concrete is significantly enhanced since PPF can block the penetration of water or harmful ions in concrete. This paper summarizes the influence of polypropylene fibre on the durability of concrete, including drying shrinkage, creep, water absorption, permeability resistance, chloride ion penetration resistance, sulfate corrosion resistance, freeze-thaw cycle resistance, carbonation resistance, and fire resistance. The authors analysed the effects of fibre content, fibre diameter, and fibre hybrid ratio on these durability indexes. The durability property of concrete can be further improved by combining PPFs and steel fibres. The drawbacks of PPF in application in concrete are the imperfect dispersion in concrete and weak bonding with cement matrix. The methods to overcome these drawbacks are to use fibre modified with nanoactive powder or chemical treatment. At last, the authors give the future research prospects of concrete made with PPFs.
Highlights
Polypropylene fibre (PPF) is a kind of linear polymer synthetic fibre obtained from propylene polymerization
We investigated and evaluated the influence of fibre content, length, and diameter on those durability indexes of PPF-reinforced concrete. e research results are conducive to a better understanding of the durability of concrete with PPFs
When adding PPFs, the concrete has lower porosity and higher crack resistance than the one without PPF. erefore, it can reduce the transmission of water and harmful media in the concrete, leading to the enhancement of durability. e PPF-reinforced concrete has lower water absorption and better impermeability, chloride resistance, sulfate resistance, carbonation resistance, and fire resistance. e drying shrinkage can be reduced by adding PPF because the PPF has positive effect on preventing deformation
Summary
Polypropylene fibre (PPF) is a kind of linear polymer synthetic fibre obtained from propylene polymerization. The resist-permeability of the concrete can be enhanced by adding PPFs due to less through cracks in the concrete [12, 21]. E durability indexes, such as water absorption, chloride penetration, sulfate attack resistance, and acid attack resistance, were enhanced by using PPFs and glass fibres together. Is paper summarized the durability indexes of PPFreinforced concrete, including drying shrinkage, creep, water absorption, permeability resistance, chloride ion penetration resistance, sulfate corrosion resistance, frost resistance, carbonation resistance, and fire resistance. It helps to overcome some major existing problems in the application of PPF in concrete. e future research prospects of PPF in concrete application were discussed. is review gives the directions for future research and contributes to solve the key scientific and engineering problems for PPF application in concrete materials
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