Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Abstract

The study presents experimental investigation on short term mechanical properties and flexural behaviour of conventional Ordinary Portland Cement (OPC) based concrete and slag-fly ash based geopolymer concrete. Conventional and geopolymer concrete mixes were designed to achieve compressive strength equivalent to M40 and M70 grade as per Indian standard code. Mechanical properties of concrete mixes such as compressive strength, split tensile strength, flexural strength, modulus of elasticity and Poisson's ratio were evaluated and compared. The flexural behaviour of reinforced concrete beams for both conventional and geopolymer concrete has been studied using 4-point bend test. The findings suggest that geopolymer concrete shows comparable mechanical properties in terms of split tensile strength, flexural strength and Poisson's ratio. However, modulus of elasticity of geopolymer concrete is lower than the conventional concrete of equivalent strength. Studies on flexure behaviour of reinforced concrete beams shows that both geopolymer and conventional concrete exhibit comparable flexural behavior in terms of load-deflection curves, yield load and yield moment. The amount of energy dissipated in flexure is marginally higher for high strength conventional concrete. Based on the visible cracks developed in flexure, it was concluded that the reinforced conventional concrete and reinforced geopolymer concrete show similar number and type of cracks in flexure.

The evaluation of behavior of geopolymer reinforced concrete and conventional reinforced concrete beams: a critical review

“…The beams' final failure involves concrete crushing in the compression zone after the yielding of the tensile steel. This review generally confirms the performance of both beams, and that the load-carrying capability of GRC beams is comparable to that of CRC beams [55].…”

“…Ojha et. al [55] investigated the mix design detail for the GRC beam dan CRC beam for normal and high-strength concrete. The CRC beam was designed according to IS 10262: 2009.…”

“…The 500kN capacity of the Flexural Testing Machine was used to test the beam prototype [55]. Every beam was intended to fail simply from pure bending.…”

“…Additionally, an experimental study on the short-term mechanical characteristics and flexural behavior of GRC and CRC beams was taken by Ojha, P.N., et al [55]. Geopolymer concrete with slag-fly ash based was used to make the GRC beams.…”

Integral waterproofing concrete mechanical properties with the addition of fly ash

“…Meanwhile, as a filler, it can improve the mechanical properties of concrete [21]- [24]. In some conditions, FA has a chemical content that can increase the binding element in cement called silica dioxide (SiO2), thus increasing the compressive strength [25]- [28]. The use of FA material is based on the properties of this material which is similar to cement and can close the pores of the concrete thereby increasing the integral waterproofing strength of the concrete.…”