Abstract
In this study of various percentage addition of glass bubble as thermal insulated material (2.5, 5.0, 7.5 and 10%) has influenced the concrete performance such as density, compressive strength and thermal conductivity. The compressive strength of geopolymer concretes achieved the maximum strength with 10 % glass bubble at 65.25 MPa for 90 days with the lowest density achieved at 2165 kg/m3. The thermal conductivity of geopolymer concrete with the present addition of glass bubble as thermal insulated materials showing better thermal insulation properties with decrease of density to 1.20 W/mK. Results highlight the thermal conductivity showing better result with reducing density of the geopolymer concrete due to the addition of glass bubble in the geopolymer concrete. The unique of spherically shape and light hollow sphere of glass bubble in the geopolymer concrete contributed better performance towards thermal insulation application with low density and thermal conductivity within applicable strength.
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