Abstract
Geopolymer is a noble material, made from reaction between aluminosilicate compounds and alkali solution which owns a good binding property. In last decades, lots of research and development works have been carried out globally to investigate the engineering, thermal, micro-structural and durability properties of geopolymer concrete as a sustainable alternative to Portland cement. Results from previous works indicated that geopolymer concrete exhibited better mechanical strength and durability properties than ordinary Portland cement (OPC) concrete. Nowadays, high-strength concrete is increasingly used in major civil construction works, such as high-rise buildings and bridges because of its structural and economic benefits over normal-strength concrete. This paper reports the experimental results on engineering properties of high-strength geopolymer concretes of 65 and 80 MPa using geopolymer binders at ambient curing conditions. High-strength concrete produced in this study was able to set quickly in ambient conditions therefore can attain sufficient strength at early days as well as exhibited higher tensile and flexural strength than concrete from OPC. High-strength geopolymer concrete can be produced with very simple mix design; however, it has some limitation for commercial applications. This paper discusses about the advantages and limitations of geopolymer high-strength concrete for its application in concrete industry.
Highlights
Manufacturing of Portland cement is responsible for around 7% of greenhouse gas emission globally [1] which poses a significant threat to the global climate changes
It has been reported that geopolymer made from fly ash or metakaolin struggled to set at normal temperature because of slow reaction rate, most experiments in the past were done in higher temperature curing [5, 10,11,12]
When slag is added in source materials as a partial replacement of flay ash or metakaolin, it makes geopolymer able to set in normal temperature as well as develop higher strength at early age as well as later age [13,14,15]
Summary
Manufacturing of Portland cement is responsible for around 7% of greenhouse gas emission globally [1] which poses a significant threat to the global climate changes. When slag is added in source materials as a partial replacement of flay ash or metakaolin, it makes geopolymer able to set in normal temperature as well as develop higher strength at early age as well as later age [13,14,15]. This is due to the stimulation of polymerization reaction by calcium presence [16] as well as partially formation of C-S-H gel in very early days [17, 18]. Applicability of some correlation equations of mechanical properties in geopolymer concrete is discussed
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