Abstract
This study presents the performance of quarry rock dust (QRD) incorporated fly ash (FA) and slag (SG) based geopolymer concretes (QFS-GPC) exposed to ambient and elevated temperatures. A total of five QFS-GPC mix types were prepared. The quantity of FA (50%) was kept constant in all the mixes, and SG was replaced by 5%, 10%, 15%, and 20% of QRD. The fresh, hardened properties of the QFS-GPC mixes, viz., workability, compressive strength, splitting tensile strength, and flexural strengths, and XRD for identification of reaction phases were evaluated. The prepared mixes were also heated up to 800 °C to evaluate the residual compressive strength and weight loss. The workability of the QFS-GPC mixes was observed to be reduced by increasing the dosage (0 to 20%) of QRD. Superplasticizer (SP) was used to maintain the medium standard of workability. The compressive, tensile, and flexural strengths were increased by replacing SG with QRD up to 15%, whereas a further higher dosage (20%) of QRD reduced the mechanical strengths of the QFS-GPC mixes. The strength of the QFS-GPC specimens, heated to elevated temperatures up to 800 °C, was reduced persistently with the increased contents of QRD from 0 to 20%. It was concluded from the study that QFS-GPC can be used to achieve 30 MPa strength of concrete.
Highlights
The ordinary Portland cement (OPC) has been used as a major ingredient for construction activities worldwide, which is generally used as a binder in the concrete [1,2]
This study presented the results of an investigation to observe the influence of incorporating quarry rock dust (QRD) wastes as a binding agent on the fresh and mechanical properties at ambient curing conditions of fly ash (FA)- and SG-blended geopolymer concrete (GPC) mixes, which are exposed to elevated temperatures to observe their residual strength properties
The mechanical strength of the QFS-GPC mixes generally increased by increasing the QRD content from 0% to 15%, while beyond this replacement level, i.e., 20%, strength decreased. iii
Summary
The ordinary Portland cement (OPC) has been used as a major ingredient for construction activities worldwide, which is generally used as a binder in the concrete [1,2]. GPC can lessen the carbon footprint associated with OPC but can use a bulk quantity of industrial by-product/waste materials such as fly ash (FA), blast furnace slag (SG), ceramic wastes, and silica fumes, etc. The improper dumping of this residue causes environmental issues such as water and air pollution. Some of these materials can be used as building materials, reducing landfill costs and protecting the environment from harmful effects. The polymeric materials are inorganic and produce geopolymers by the polymerization of aluminosilicates with alkaline solutions that harden and strengthen at ambient temperatures [11]
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