Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete

Li, Jing jun; Niu, Jian; Wan, Chaojun; Jin, Biao; Yin, Ya liu

doi:10.1016/j.conbuildmat.2016.04.116

Cited by 156 publications

(42 citation statements)

References 23 publications

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“…This is because of the large specific surface area of the fibre, in which a layer called the interfacial transition zone (ITZ) with high porosity will form on the fibre surface. The ITZ is the weakest area in the composite system and contains a large number of connected pores [ 40 , 41 ]. Although the permeability and porosity of concrete are not synonymous, it is generally accepted that the permeability of concrete decreases with increasing porosity [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…Hence, BF has a good bonding property with the matrix, and the BF-matrix ITZ is thin and has low porosity. In contrast, PF is hydrophobic [ 40 ] and has a larger diameter (30 μm) than BF, which leads to a stronger wall effect. As a result, PF has a poorer bonding property with the matrix and a wider ITZ with higher porosity compared to BF [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

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Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Yong

Niu

2021

Materials

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The effect of fibre reinforcement on the chloride diffusion property of concrete is controversial, and the coupling effect of sulphate erosion and drying–wetting cycles in marine environments has been neglected in previous studies. In this study, the chloride diffusion property of hybrid basalt–polypropylene fibre-reinforced concrete subjected to a combined chloride–sulphate solution under drying–wetting cycles was investigated. The effects of basalt fibre (BF), polypropylene fibre (PF), and hybrid BP–PF on the chloride diffusion property were analysed. The results indicate that the presence of sulphate inhibits the diffusion of chloride at the early stage of erosion. However, at the late stage of erosion, sulphate does not only accelerate the diffusion of chloride by causing cracking of the concrete matrix but also leads to a decrease in the alkalinity of the pore solution, which further increases the risk of corrosion of the reinforcing steel. An appropriate amount of fibre can improve the chloride attack resistance of concrete at the early stage. With the increase in erosion time, the fibre effectively prevents the formation and development of sulphate erosion microcracks, thus reducing the adverse effects of sulphate on the resistance of concrete to chloride attack. The effects of sulphate and fibre on the chloride diffusion property were also elucidated in terms of changes in corrosion products, theoretical porosity, and the fibre-matrix interface transition zone.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Yong

Niu

2021

Materials

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“…Tanyildizi [6] used carbon fibers to reinforce lightweight concrete and claimed that both the compressive and flexural strengths of concrete were enhanced by carbon fiber. Li et al [7] reported that polypropylene fiber effectively reinforced the LWAC and improved its tensile strength, flexural toughness, and impact resistance; moreover, an optimal polypropylene fiber content of 9 kg/m 3 was recommended. Although a single fiber improves the properties of concrete at only a single scale, it was reported that concrete reinforced with two or more different types of fiber can benefit from each individual type of fiber and generate a positive synergistic response [8].…”

Section: Introductionmentioning

confidence: 99%

Properties of Lightweight Aggregate Concrete Reinforced with Carbon and/or Polypropylene Fibers

Wei

Xue

2020

Materials

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The impact of carbon and polypropylene fibers in both single and hybrid forms on the properties of lightweight aggregate concrete (LWAC), including the slump, density, segregation resistance, compressive strength, splitting tensile strength, flexural strength, and compressive stress–strain behavior, were experimentally investigated. The toughness ratio and ductility index were introduced for quantitatively evaluating the energy-absorbing capacity and post-peak ductility. A positive synergistic effect of hybrid carbon and polypropylene fibers was obtained in terms of higher tensile strength, toughness, and ductility. The toughness ratio and ductility index of hybrid fiber-reinforced LWAC were increased by 26%–37% and 12%–27% compared with plain LWAC, respectively. The fiber in both single and hybrid forms had a smaller effect on the linearity ascending branch of the stress–strain curves, whereas the post-peak patterns in terms of the toughness and ductility for the hybrid fiber-reinforced LWAC were significantly improved when the fiber in hybrid form.

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“…Research has shown that microcracking of concrete exposed to high temperatures can be further investigated using a digital image processing tool [12][13][14]. In this regard, the assessment of high-performance concrete (HPC) is best performed under SEM, which will include more advanced image analysis [15][16][17] Consequently, the findings of past research have shown that the SEM analysis of concrete microcharacteristics can provide a deeper understanding of concrete behaviour and the diagnosis of concrete complexities.…”

Section: Introductionmentioning

confidence: 99%

Digital Analysis of Geo-Referenced Concrete Scanning Electron Microscope (SEM) Images

Ahamad

Maizul

2020

Civil and Environmental Engineering Reports

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The microstructural evaluation of complex cementitious materials has been made possible by the microscopic imaging tools such as Scanning Electron Microscope (SEM) and X-Ray Microanalysis. Particularly, the application of concrete SEM imaging and digital image analysis have become common in the analysis and mapping of concrete technology. In this study, six samples of two-dimensional (2D) SEM images were spatially resampled to produce Geo-referenced SEM sample images. Subsequently, they were analyzed and the intensity histogram plot was produced to facilitate visual interpretation. The consecutive digital image analysis performed was the enhancement and noise removal process using two filtering methods i.e. median and adaptive box filter. The filtered resampled images, then undergone the unsupervised K-Means classification process to collectively separate each individual pixel corresponds to the spectral data. By spatial segmentation of K-Means algorithms, the cluster groups generated were carefully reviewed before proceeding to the final analysis. From the resulting data, the mapping of the spatial distribution of k-cluster and the quantification of micro-cracks (voids) were performed. The results of the SEM images (1st - 4th sample) showed a higher percentage of k-cluster data indicating a good correlation with the major elemental composition of EDX analysis, namely Oxide (O), Silicon (Si) and Carbon (C). Meanwhile, the subjective visual assessment of the image (5th and 6th sample) has confirmed the micro-crack developments on the concrete SEM images upon which the crack density was 3.02 % and 1.30 %, respectively.

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Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete

Cited by 156 publications

References 23 publications

Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Properties of Lightweight Aggregate Concrete Reinforced with Carbon and/or Polypropylene Fibers

Digital Analysis of Geo-Referenced Concrete Scanning Electron Microscope (SEM) Images

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