Mechanical Performance of Amorphous Metallic Fiber-Reinforced and Rubberized Thin Bonded Cement-Based Overlays

Abstract

To improve the flexural behavior of thin bonded cement-based overlays, this study was carried out on the use of repair material incorporating amorphous metallic fibers (AMFs) in combination with the rubber aggregates obtained from grinding of worn-out tires. For this study, sixteen mortar mix compositions were prepared to contain AMFs and/or rubber aggregates to be used as overlay material while the substrate used was plain cement mortar. Rubber aggregates were incorporated at three different replacement ratios (i.e., 10%, 20% and 30%) by an equivalent volume of sand, and AMFs were added in three different dosages (i.e., 10 kg/m3, 20 kg/m3 and 30 kg/m3). In this study, composite beams (500 × 100 × 140 mm) comprising substrate (500 × 100 × 100 mm) and repair layer (500 × 100 × 40 mm) were prepared and investigated under flexural loading. Experimental results showed that the increase in rubber content resulted in a decrease compressive strength, flexural strength and modulus of elasticity. Rubberized fiber-reinforced cementitious composites (30R30F) exhibited higher flexural toughness and the flexural toughness improved up to 400%. Toughness and maximum deflection of composite beams enhanced significantly due to synergetic effect of AMF and rubber aggregates. It was observed that before peak load, rubber plays its role by delaying the micro-crack propagation. Results also revealed that the steel fibers reinforcement plays an important role in restraining the crack openings under flexure loading. In the post-peak region, steel fibers control the cracks from propagating further by bridging action and provide higher post-peak residual strength.

Analysis of the Mechanical Performance of High-Strength Nano-Modified Cement Mortars for Overlays

“…In order to improve this adhesion, many known methods are used, such as using bonding agents, additives, surface treatment techniques to increase surface roughness, or curing procedures [7][8][9][10][11][12][13]. One of these methods is the modification of the structure of the overlay using various additives [14][15][16][17] to the mortar constituting the overlay. The mechanical performance of the overlays is determined by their strength, adhesion, and functional properties.…”

Influence of Different Types of Fillers on the Performance of PMMA-Based Low-Temperature Rapid Repair Mortar

“…Ordinary silicate cement mortar is prone to brittle fracture and high shrinkage, which is not conducive to the compatibility between the repair mortar and the concrete pavement. In order to solve this problem, some scholars added various types of fibers or used early-strength or fast-hardening special cement for modification and optimization [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], which greatly improved the toughness of the repair mortar and shortened the maintenance time. Another part of scholars choosed to use epoxy resin, polyurethane, methyl methacrylate and other polymers as repair materials to replace cement mortar [ 14 , 15 , 16 , 17 ].…”