Flexural fatigue behaviour of recycled tyre polymer fibre reinforced concrete

Abstract

The utilization of recycled tyre polymer fibre (RTPF) into concrete production is feasible to promote sustainable development and mitigate environmental pollution of global landfilled waste tyres. This paper for the first time presents an experimental study on flexural fatigue behaviour of concrete reinforced with mixed RTPF considering different fibre dosages (i.e., 1.2, 2.4, 4.8 and 9.6 kg/m 3). Results indicate that with the presence of RTPF, the flexural strength of concrete was increased by 3.6-9.6%. The fatigue life of all mixtures followed the two-parameter Weibull distribution and can be accurately predicted using the developed double-logarithm fatigue equations. Concrete reinforced with 4.8 kg/m 3 of RTPF presented the longest fatigue life under different failure probabilities. RTPF and polypropylene fibre (PPF) reinforced concrete exhibited similar fatigue failure mechanisms. 0.2-0.4% Vf of RTPF could substitute around 0.1% Vf of PPF in concrete considering overall static, dynamic and fatigue performance.

Behaviour of recycled tyre polymer fibre reinforced concrete under dynamic splitting tension

“…It should be noted that RTP fibres were used as received in this study and thus many rubber particles are attached. To better understand the percentage of attached rubber particles of as-received RTP fibres, a simplified laboratory sieving method based on a previous study [12] was applied and a detailed testing process was reported in authors' previous research [20]. It was found that the as-received RTP fibres contain 56.8% cleaned RTP fibres and 43.2% rubber particles by weight [19,20].…”

“…To better understand the percentage of attached rubber particles of as-received RTP fibres, a simplified laboratory sieving method based on a previous study [12] was applied and a detailed testing process was reported in authors' previous research [20]. It was found that the as-received RTP fibres contain 56.8% cleaned RTP fibres and 43.2% rubber particles by weight [19,20]. Table 3 illustrates the physical and mechanical properties of RTP and PP fibres, which are the same as those used in the previous studies [19,20].…”

“…It was found that the as-received RTP fibres contain 56.8% cleaned RTP fibres and 43.2% rubber particles by weight [19,20]. Table 3 illustrates the physical and mechanical properties of RTP and PP fibres, which are the same as those used in the previous studies [19,20]. Here, the dimension of RTP fibres was characterised based on a group of samples using a microscope and a fibre diameter tester (XGD-1 Fibre Diameter Tester), the results of which are presented in Fig.…”

“…Thus, it is vital to understand the behaviour of RTP-FRC under a wide range of strain rates corresponding to the above loading conditions. As presented in Table 1, Chen et al [19,20] investigated the effect of four different RTP dosages (0.1-0.8 vol%) on the dynamic compressive properties and flexural fatigue behaviour of concrete and observed that incorporating 0.2 vol% RTP fibre improved the compressive strength and energy absorption capacity under various strain rates by about 12.9% and 54.4%, respectively. In addition, the flexural fatigue behaviour was enhanced with the addition of RTP fibres.…”

Dynamic Properties of Pretreated Rubberized Concrete under Incremental Loading

“…In recent years, the continuous development of new raw materials has enriched the materials in the field of construction [ 1 , 2 , 3 , 4 ], among which the treatment and recovery of solid waste are of great significance for environmental protection, such as the utilization of recycled tyre polymer fiber as concrete reinforced materials by Chen et al [ 1 ], the incorporation of construction and demolition wastes as recycled aggregates by Rodríguez et al [ 2 ], and the utilization of waste tyre rubber as concrete material by Huang et al [ 3 ] and Gupta et al [ 4 ]. The scrap tyre has become one of the most problematic solid wastes throughout the world, and many researchers have proved that scrap tyres are sources of valuable raw materials [ 5 , 6 , 7 ].…”