Mix Design of Fly Ash Based Geopolymer Concrete

Abstract

Geopolymer is a new development in the world of concrete in which cement is totally replaced by pozzolanic materials like fly ash and activated by highly alkaline solutions to act as a binder in the concrete mix. For the selection of suitable ingredients of geopolymer concrete to achieve desire strength at required workability, an experimental investigation has been carried out for the gradation of geopolymer concrete and a mix design procedure is proposed on the basis of quantity and fineness of fly ash, quantity of water, grading of fine aggregate, fine to total aggregate ratio. Sodium silicate solution with Na 2 O = 16.37 %, SiO 2 = 34.35 % and H 2 O = 49.28 % and sodium hydroxide solution having 13 M concentration were maintained constant throughout the experiment. Water-to-geopolymer binder ratio of 0.35, alkaline solution-to-fly ash ratio of 0.35 and sodium silicate-to-sodium hydroxide ratio of 1.0 by mass were fixed on the basis of workability and cube compressive strength. Workability of geopolymer concrete was measured by flow table apparatus and cubes of 150 mm side were cast and tested for compressive strength after specified period of oven heating. The temperature of oven heating was maintained at 60°C for 24 h duration and tested 7 days after heating. It is observed that the results of workability and compressive strength are well match with the required degree of workability and compressive strength. So, proposed method is used to design normal and standard geopolymer concrete.

Comparison of the Flexural Performance and Behaviour of Fly‐Ash‐Based Geopolymer Concrete Beams Reinforced with CFRP and GFRP Bars

“…In this study, ten trial mixes were performed for achieving the required compressive strength for GPC beams. e selected parameters for the trial mixes were based on methods proposed by Ferdous et al [28] and Patankar et al [29]. Molarity of sodium hydroxide, alkalinefly ash ratio, and the water-binder ratio were taken as variables.…”

Mechanical Properties and Mix Design of Geopolymer concrete – A review

“…Normal concrete is prepared by using binding material called Portland cement along with aggregates. It is calculable that the necessity of cement in India goes to be triumphant in half a billiontonnesthrough 2020 and there will be an insufficiency of 0.23 billiontonnes(~58%) and also the demand for cement has been without end growing attributable to enlarged infrastructural things to do in the country like India [1]. The production of cement in large amounts has a huge impact on limestone reserves as well as on Environment and it is a highly fuel or energy consuming process, generating 1 ton of CO 2 to generate 1 ton of cement [2][3][4].…”

Optimization of the Mix Formulation of Geopolymer using Nickel-laterite Mine Waste and Coal Fly Ash

“…The use of cement-based concrete, like ordinary Portland cement (OPC), is globally accepted due to ease of operation, mechanical properties, and low-cost production compared to other construction materials [2]. However, there are drawbacks of OPC like it releases approximately one ton of CO2, a greenhouse gas, to produce one ton of OPC [3], high energy consumption during production [4], and consumes a significant amount of natural resources [2]. Due to increasing awareness of this issue, a viable alternative for the conventional Portland cement is currently being reviewed and studied by many researchers and scientists.…”