Structural Behavior of Reinforced Concrete Slabs Containing Fine Waste Aggregates of Polyvinyl Chloride

Abstract

In several areas worldwide, the high cost and shortage of natural resources have encouraged researchers and engineers to explore the serviceability and feasibility of using recycled aggregates in concrete mixtures, substituting a normal aggregate percentage. This technique has advantages for the environment by reducing the accumulation of waste materials, while it impacts the fresh and hardened concrete performances, reducing workability, flexural strength, compressive strength, and tensile strength. However, most studies have investigated the influence of replacing normal aggregates with waste aggregates on the concrete mechanical properties without examining the impact of using waste materials on concrete structural performance. The aim of this research is to investigate the effect of replacing 75% of sand volume with polyvinyl chloride (PVC) fine waste aggregates on the performance of reinforced concrete slabs. Different thicknesses of the concrete layer (0%, 25%, 50%, and 100% of slab thickness) containing PVC fine waste aggregates are investigated. Based on the reductions in the toughness and flexural strength capacity due to incorporating 75% PVC fine aggregate dosage, two approaches are used to strengthen the slabs with 75% PVC fine aggregates. The first approach is adding polyvinyl alcohol (PVA) to the PVC fine aggregate concrete mix to improve the mechanical properties of the concrete. The PVA increases the water viscosity in the concrete, which reduces the dry out phenomenon. With that said, the PVA modified fresh concrete does enable the use of the limits of the PVC fine aggregate dosage for high dosage plastic aggregate concrete. The second approach uses two fiber wire mesh layers as an additional reinforcement in the tested slab. Results show that the PVC-30 slab exhibits an 8% decrease in total area toughness compared to the control (Con) slab, while for PVC-60 slab toughness, the total area shows 26% less. Additionally, the inclusion of PVA in the concrete with 75% PVC plastic waste fine aggregate replacement greatly influences the pre-and post-cracking ductile performance among other slabs, representing that using PVA with higher contents might increase the flexural performance. Therefore, due to the substantial effect of PVA material on the concrete flexural performance, it is proposed to utilize PVA with an optimum PCV fine aggregate dosage in the concrete mix.

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

“…Therefore, an efficient reinforcement method is especially needed to mitigate the effects of the opening, including the effects of its size and position. Discontinuous steel fibers were previously utilized and proved to be an efficient and promising technique for improving the tensile capacity and toughness of the original RC structures [10][11][12][13], followed by the inclusion of fiber-reinforced concrete (FRC) material in the strengthening and retrofitting fields [14][15][16][17]. However, the cyclic behavior of strengthened slabs, including the cracking performance and ultimate strength, was significantly improved by the addition of synthetic fibers [18].…”

Composites of Poly(vinyl chloride) with Residual Hops after Supercritical Extraction in CO2

“…The widespread use of durable PVC, however, generates a large amount of waste, and a great challenge for scientists is developing processes that reduce the impact of PVC post-consumer waste on the environment. Undoubtedly, reducing waste is possible through recycling, and among the many methods, mechanical recycling is the most effective and environmentally friendly: grinding PVC for use as polymer filler [ 7 , 8 ], a polymer blend [ 9 ] or an aggregate substitute in concrete mix [ 10 , 11 , 12 ]. Another method is to add natural filler from the agro-food industry (agro-waste), thereby supporting biodegradability, renewability and the economy [ 13 , 14 , 15 , 16 , 17 , 18 ].…”

The Use of Crushed Cable Waste as a Substitute of Natural Aggregate in Cement Screed

“…Nevertheless, it is still very important to find other possibilities for the replacement of natural sand with other materials and protect non-renewable resources. Concurrently, the industry is generating a large scale of waste, which is accumulated, because of complicated or no practical use [9,10]. In recent years, various types of slags, rice husks, nutshells, etc., as partial substitution were studied [11,12].…”