A BLEND OF SODA-LIME SILICATE AND BOROSILICATE WASTE GLASS FOR PARTIAL REPLACEMENT OF CEMENT IN CONCRETE
A BLEND OF SODA-LIME SILICATE AND BOROSILICATE WASTE GLASS FOR PARTIAL REPLACEMENT OF CEMENT IN CONCRETE
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Date
2018-08
Authors
GAMBO, HABIBU ISARI
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Abstract
This study evaluated the possibility of using Soda-lime Silicate and Borosilicate glass waste as an effective additives for improving the properties of cement-based cementitious materials with obvious advantages both from environmental and economic viewpoints after the ultimate strength (after 28 days of curing). Results show that the incorporation of various compositions (wt) of waste glass powder (2.5%, 5.0%, 7.5%, 10%, 12.5%, 15%, 17.5% and 20%) increases the compressive strength by nearly 46%, while higher amounts have the opposite results. When waste glass particles are ball-milled to micro size powder, it is expected to undergo pozzolanic reactions with cement hydrates, forming secondary Calcium Silicate Hydrate. The research work looked at the chemical analysis using X-Ray fluorescence (XRF) technique and found some differences in the chemical composition of soda-lime silicate and borosilicate waste glass. The major oxides detected were combined proportion of SiO2, Al2O3, and Fe2O3with percentage value of 73.202%, 72.998%, 0.411%, 0.201%, and 0.223%, 0.112% respectively.Workability was determined by slump test method the control had slump of 55 mm, the samples that contains 5% of waste glass powder had 47mm slump less than the control thereby reduces the slump value. The slump test correlates with the compacting factor, since the value of control mixes higher. It means that it is more workable than other mixes, however none of the mixes fall below the acceptable value for structural work. Control had 0.92 and all other mixes were 0.85. TheSetting time of the specimens that contains waste glass powder was also determined and found that it delayed initial and final setting time, and the effect increases as the percentage replacement of cement with waste glass powder increases,The microstructural characterization was also carried out using Scanning Electron Microscope (SEM) and X‐Ray Diffraction (XRD) to characterize the concrete samples. It was found that the morphology of concrete samples within waste glass powder (10%) 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% 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, cylinder and beam 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/mm2 28 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.The flexural strength test results of the control and the 10% waste glass replacement were 3.96 N/mm2, 3.17N/mm2 for 7, 4.95N/mm2, 4.58 N/mm2 14, and 5.87N/mm2, 5.27N/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.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF MASTER OF SCIENCE DEGREE IN POLYMER SCIENCE AND TECHNOLOGY DEPARTMENT OF CHEMISTRY FACULTY OF PHYSICAL SCIENCE AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
Keywords
A BLEND OF SODA-LIME SILICATE,, BOROSILICATE WASTE GLASS,, PARTIAL REPLACEMENT OF CEMENT IN CONCRETE,