Investigating the mechanical properties and durability in acidic environment of hybrid fiber-reinforced polymer modified mortars containing glass powder and slag

In the current study, mechanical properties and durability of polymer modified mortars by Styrene Butadiene Resin (SBR) containing glass powder and slag is studied. Different mix design with and without SBR is regarded by consideration of different amount of glass powder and slag individually or simultaneously, and furthermore, hybrid or individual presence on glass, polypropylene, and steel fibers is investigated. In all of the fiber-reinforced mixes, tensile and flexural strengths were increased. Also, the presence of SBR improved these strengths. The maximum of flexural strength was observed in polymer modified mortars contained hybrid fibers of glass, polypropylene, and steel. In these mixes with presence of 10% glass powder, 10% slag and, 5% slag and 5% glass powder, the flexural strength increased 36.05, 31.84 and 41.06% , respectively. Polymer modified mortars showed higher T_150^D toughness and the presence of SBR significantly increased the energy absorption of mixes. Moreover, simultaneous use of glass powder and slag enhanced the energy absorption. The use of SBR drastically improved the durability against acidic environment. The effect was observed in weight loss, and residual strength of samples after exposure the sulfuric acid environment. The residual compressive strength after exposure to acid in polymer modified mortars contained polypropylene and steel fibers with presence of 10% glass powder, 10% slag and, 5% slag and 5% glass powder, were respectively, 33.26, 33.42 and 33.76% higher than control sample.