Improvement of Mechanical Properties in Polypropylene- and Glass-Fibre-Reinforced Peach Shell Lightweight Concrete

Fan Wu,Bo Feng,Shuang Zhao,Zhaofeng Diao,Xiaolong Li,Wei Sun,Changwu Liu

doi:10.1155/2018/6250941

Fan Wu, Bo Feng + Show 5 more

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https://doi.org/10.1155/2018/6250941

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Abstract

The use of the polypropylene fibre and glass fibre with different volume fractions to improve the mechanical properties of peach shell lightweight concrete was investigated in this study. The volume fractions of 0.25%, 0.50%, and 0.75% were used for each fibre. The results showed that, as the polypropylene fibre and glass fibre were added into peach shell concrete, the density was reduced by up to 6.1% and the compressive strength, splitting tensile strength, and flexural strength were increased by 19.1%, 54.3%, and 38.6%, respectively. The highest compressive strength, splitting tensile strength, and flexural strength of 29.3 MPa, 2.87 MPa, and 3.09 MPa, respectively, were produced by peach shell concrete with 0.75% glass fibre. The results indicated that the incorporation of fibres significantly enhanced the postfailure toughness of peach shell concrete. It was found that the glass fibre was more effective than the polypropylene fibre in improving the mechanical properties of peach shell concrete. Although the incorporation of fibres slightly increased the water absorption and porosity, the type and content of fibres had no significant effect on water absorption and porosity. Therefore, the mechanical properties of peach shell lightweight concrete can be improved by adding polypropylene fibres and glass fibres.

Highlights

Academic Editor: Nadezda Stevulova e use of the polypropylene fibre and glass fibre with different volume fractions to improve the mechanical properties of peach shell lightweight concrete was investigated in this study. e volume fractions of 0.25%, 0.50%, and 0.75% were used for each fibre
E results showed that, as the polypropylene fibre and glass fibre were added into peach shell concrete, the density was reduced by up to 6.1% and the compressive strength, splitting tensile strength, and flexural strength were increased by 19.1%, 54.3%, and 38.6%, respectively. e highest compressive strength, splitting tensile strength, and flexural strength of 29.3 MPa, 2.87 MPa, and 3.09 MPa, respectively, were produced by peach shell concrete with 0.75% glass fibre. e results indicated that the incorporation of fibres significantly enhanced the postfailure toughness of peach shell concrete
Previous studies showed that lightweight aggregate concrete (LWAC) with higher compressive strength can be produced, but this concrete was prone to brittle and poor tensile strength due to the fact that the lightweight aggregate is usually weaker under tension [7, 8]. e tensile strength of LWAC is about one-tenth of its compressive strength [9]. e use of PS instead of normal weight aggregates (NWAs) has a positive impact on density, and a reduction in density up to 30% can be achieved in the peach shell concrete (PSC)

Summary

Introduction

Academic Editor: Nadezda Stevulova e use of the polypropylene fibre and glass fibre with different volume fractions to improve the mechanical properties of peach shell lightweight concrete was investigated in this study. e volume fractions of 0.25%, 0.50%, and 0.75% were used for each fibre. E results showed that, as the polypropylene fibre and glass fibre were added into peach shell concrete, the density was reduced by up to 6.1% and the compressive strength, splitting tensile strength, and flexural strength were increased by 19.1%, 54.3%, and 38.6%, respectively. A comparison of the performance of PP fibre- and G fibre-reinforced peach shell lightweight concrete is investigated and reported, including workability, density, compressive strength, splitting tensile strength, flexural strength, modulus of elasticity, residual compressive strength, water absorption, and porosity.

Results

Conclusion