Flexural behaviour of reinforced concrete beams containing waste plastic fibers

Abstract

This research was conducted to study the effect of adding waste plastic fibers (WPFs) on the behavior of reinforced concrete (RC) beams. Fifteen simply supported RC beams with a cross section of (100 * 150) mm and a clear span of (1100) mm was tested under two-point loads until failure. Three beams of the total samples were made from the reference mix, and the twelve beams remaining were made from concrete mixes containing WPFs with volumetric percentage ratios (Vf) varying from (0.5% to 2%) of the total volume. These beams were divided into three main groups according to the longitudinal steel reinforcement area ratio (ρ), and these ratios were approximately equal to (ρ max, 0.75 ρ max, ρ min). Test results established that the adding of WPFs, in addition, to decreasing the danger of PET wastes on the environment, leads to increasing the maximum applied load causing ultimate failure, an increment in ductility index and transformation of the mode of failure of the tested beams into a more ductile one for all beams contains such kind of fibers.

Retracted: Predicting the compressive strength of modified recycled aggregate concrete

“…The performance of the developed models was then compared with the performance of the experimentally determined amounts. The statistical value of input variables as well as output variables for training (75%) and testing (25%) data phases are presented in Table 3 2 …”

Properties of Concrete Produced using Surface Modified Polyethylene Terephthalate Fibres

“…In addition, Borg et al (2016) [10] noted a 0.5% to 8.5% strength reduction that on the addition of PET fibres in concrete due to the low elastic modulus of plastic fibres resulting in poor composite action [54], findings which have been supported by other researchers [55]. However, some studies show a slight improvement of compressive strength at 0.5% [44,50] and 1% [56] fibre dosage. It is worthwhile to note that in most of the studies that report an increase in compressive strength, short, smooth fibres were used, and hence fair compaction was achieved.…”

“…The lack of composite action between the fibres and concrete ingredients creates lines of weakness and introduces voids in the matrix, making the concrete porous and thus lowering its compressive strength. Uneven distribution of fibres is experienced with longer fibres, increasing the micro-crack envelopes and hence reducing the loading required to propagate cracks until failure [13,56]. This, coupled with the incomplete compaction as the fibre length increases, leads to a subsequent reduction in the compressive strength.…”

“…Despite the good bonding of sand-coated fibres, increasing their content makes the concrete matrix more porous and their low elastic modulus offers no resistance to the compressive forces compared to say steel fibres. Most of the studies that report an improvement in the compressive strength of concrete on the inclusion of fibres use consistently short fibres (within a range of 15-50 mm) [13,56,62] and this improvement only occurs at low fibre dosages.…”

A Comprehensive Review on the Utilization of Recycled Waste Fibers in Cement-Based Composites

“…In order to produce WRPF, post-consumer plastics are processed and washed before being sliced manually through a paper shredder or a compact disk (CD) cutter device. The bottom and neck of the plastic bottles are removed for other uses [16,17,[68][69][70]. Other scientists have used long plastic chips made of machined steel waste pieces in commercial vehicle plants [71].…”