Abstract
This paper presents the study carried out on the utilization of Waste Glass Powder (WGP) as supplementary cementitious material in concrete. The evaluation of the influence of WGP on the mechanical properties of concrete was carried out by casting and testing of concrete samples as per ASTM standards (cylinders and beam elements). The control samples were designed to represent field conditions with a target compressive strength of 20,000 kPa. The Portland cement in concrete was substituted with WGP in proportions of 0%-35% by weight, in increments of 5%. Two curing domains were adopted in the preparation of the test samples to evaluate the effect of pozzolanic material wherein the tested samples were cured for 28, 56, and 84 days. The study results indicated a reduction in compressive strength of concrete up to 10% with partial replacement of cement with 25% of WGP when standard curing of 28 days was adopted. Furthermore, with the same replacement proportion and prolonged curing for 84 days, the gap in strength reduction was reduced by 5%. However, a significant decrease in workability was noted between the control concrete samples and glass powder infused concrete. Furthermore, the Waste Glass Powder Concrete (WGPC) exhibited an improved flexural strength with the modulus of rupture for WGPC being 2% higher than control concrete at the age of 84 days. Based on the results of this study it was concluded that 25% replacement of cement with WGP provides an optimum replacement ratio. Doi: 10.28991/cej-2020-03091620 Full Text: PDF
Highlights
The construction industry has experienced a boom in wake of the development of concrete as a construction material
The 28 days of testing showed that the compressive strength of concrete in with the varying amount of Waste Glass Powder (WGP) showed a loss in strength which was in between, 17 to 55% in comparison to concrete mix (CM) (Figure 10)
At 56 days, the compressive strength improved as the pozzolanic reaction of WGP starts, and the internal structure starts to consume the added glass powder
Summary
The construction industry has experienced a boom in wake of the development of concrete as a construction material. It is estimated that cement production contributes approximately 7% of the overall carbon footprint [1, 2] This has led researchers to explore waste materials which can be used as partial replacement of cement. Glass powder has demonstrated pozzolanic properties under various curing temperatures [13] encouraging researchers to explore its use as an SCM. Several studies have been conducted to explore the utilization of WGP as an SCM/pozzolanic material. These studies have been focused on the use of a certain type of glass, having a particular chemical composition and crystalline structure, such as Soda-lime silica, Boro-silicate, Lead crystal, and Aluminosilicate, to name a few [references]. This study has been carried on concrete samples that have been evaluated for their mechanical properties when cured for a short-term, standard duration, and prolonged periods
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