Abstract
Due to the rapid depletion of natural resources, the use of waste materials and by-products from different industries of building construction has been gaining increased attention. Geopolymer concrete based on Pozzolana is a new material that does not need the presence of Portland cement as a binder. The main focus of this research is to produce lightweight geopolymer concrete (LWGPC) using artificial coarse lightweight aggregate which produced from locally available bentonite clays. In this investigation, the binder is low calcium fly ash (FA) and the alkali activator is sodium hydroxide and sodium silicate in different molarities. The experimental tests including workability, fresh density, also, the compressive strength, splitting tensile strength, flexural strength, water absorption and ultrasonic pulse velocity at the age of 7, 28 and 56 days were studied. The oven dry density and thermal conductivity at 28 days age are investigated. The results show that it is possible to produce high strength lightweight geopolymer concrete successfully used as insulated structural lightweight concrete. The 28-day compressive strength, tensile strength, flexural strength, dry density, and thermal conductivity of the produced LWGPC are 35.8 MPa, 2.6MPa, 5.5 MPa, 1835kg/m3, and 0.9567 W/ (m. K), respectively.
Highlights
Environmental pollution is the most severe problem that the world is facing today
The curing of fly ash lightweight geopolymer concrete is mostly carried out in previous researches at elevated temperatures; this is because the reaction of fly ash based geopolymer martial is so slow and usually show both slow setting and strength development
All previous researchers conducted that curing time and curing temperatures significantly affect the compressive strength of geopolymer concrete [8, 9]
Summary
The production of ordinary Portland cement (OPC) causes emission of pollutants which result in environmental pollution[1], are being made in the construction industry to address this by developing alternative binders in concrete. The use of lightweight concrete as a building material is very effective in saving energy because of the increase in thermal insulation capacity through the flagging thermal conductivity of lightweight aggregates [5]. Promote effects are expected when fly ash binder and lightweight aggregates are combined to produce environmentally eco-friendly concrete because of the great advantages of both materials. First significant effect is the excellent reduction in CO2 emission from concrete building structures by the use of fly ash (FA) binder with an energy-saving effect due to the use of lightweight aggregates. The aim of this research is to produce lightweight geopolymer concrete (LWGPC) with high strength, using artificial coarse lightweight aggregate which is produced from byproducts
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