UTILIZATION OF WASTE GLASS POWDER AS A POZZOLANIC MATERIAL FOR PARTIAL REPLACEMENT OF CEMENT IN CONCRETE

Abstract

The utilization of glass waste powder as cement additives for partial replaceme nt of cement in concrete could be an important step toward the development of sustainable infrastructure systems especially when it’s used as a pozzolanic material. When waste glass particles are ball -milled to micro size powder, it is going to undergo pozzolanic reactions with cement hydrates, forming secondary Calcium Silicate Hydrate. This research looked at the chemical analysis using X -Ray fluorescence technique and found minor differences in the chemical composition of soda-lime silicate and borosilic ate waste glass . The microstructural characterization was also carried out using Scanning Electron Microscope and X ‐Ray Diffraction to characterize the concrete samples. It was found that the morphology of concrete samples modified with waste glass powder (10%, and 20%) was denser than the control sample (0%). Also, XRD results indicated that the intensity of the peaks , in particular of portlandite, is significantly reduced in the 10% waste glass sample than the control (10% of portlandite in the control, 2% of portlandite in 10% and 5% of portlandite in 20% waste glass replacement). Various compositions of the samples (Control 0%, 2.5%, 5.0%, 7.5%, 10%, 12.5%, 15%, 17.5% and 20%) of concrete cube and cylinder samples were prepared and tested for strength at 7, 14 and 28 days of curing. The compressive strength test results of the control and the 10% waste glass replacement were 20.95 N/mm2, 16.44N/mm2 for 7, 26.52 N/mm2, 24.14 N/mm2 14, and 31.38 N/mm2, 28.82 N/mm228 days respectively. The tensile strength test results of the control and the 10% waste glass replacement were 2.08 N/mm2, 1.65N/mm2 for 7, 2.65N/mm2 , 2.41 N/mm2 14, and 3.13N/mm2, 2.89N/mm2 28 days respectively. It can be concluded that all the samples can be used for structural purposes, this is because all the samples (except for 2.5% replacement which had 23.12 N/mm2) which was less than the maximum strength specified by ASTM 24.2 N/mm2 at 28 days.