Topic
Geopolymer
About: Geopolymer is a research topic. Over the lifetime, 6776 publications have been published within this topic receiving 157991 citations. The topic is also known as: geopolymers.
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TL;DR: In this article, the development of lightweight-foamed concrete with geopolymer technology by utilizing industrial wastes such as oil palm shell (OPS) as lightweight coarse aggregate, palm oil fuel ash (POFA) and low calcium fly ash (FA) as binders in the concrete was presented.
88 citations
TL;DR: In this paper, different content of Ca(OH)2 were adopted to prepare calcium containing geopolymers, and compressive strength and hydrochloric acid attack tests were conducted to evaluate the effect of calcium content on the macro-performances.
Abstract: Fly ash-based geopolymer, regarded as a eco-friendly cementitious material instead of ordinary Portland cement, has been rapidly developed and applied in practical engineering practice. Previous researches demonstrated that calcium component produces distinct effect on the formation of polymer gel products, and therefore influencing the macroscopic mechanical behaviors and microstructure of geopolymers. However, the influence mechanism of calcium component on the formation of gels product is still not clear. In this study, different content of Ca(OH)2 were adopted to prepare calcium containing geopolymers. The compressive strength and hydrochloric-acid attack tests were conducted to evaluate the effect of calcium content on the macro-performances. Then, scanning electron microscopy-energy spectrum test (SEM-EDS) was carried out to accesses the morphology and elemental components of the prepared composites. Thereafter, the microstructure of gels product was probed through Fourier transform infrared (FTIR) spectroscopy and 29Si nuclear magnetic resonance (NMR) spectroscopy. The critical value of elemental ratio (Na + K + Ca)/Al to characterize the gel product was specified. Two kinds of fly ash and two alkali-activated solutions were adopted to verify the results. The geopolymerization products will be calcium-containing geopolymer gels (C,N-A-S-H) when (Na + K + Ca)/Al≤0.95, while be coexist form of C-S-H and N-A-S-H gels when (Na + K + Ca)/Al>0.95. The results provide experimental basis and references for the application of calcium-containing solid wastes in geopolymer materials.
88 citations
TL;DR: In this article, a green geopolymer paste synthesized from industrial and agricultural waste materials was employed as an adsorbent to remove the basic dye methylene blue from aqueous solutions.
88 citations
TL;DR: In this article, the authors used concrete demolition waste (CDW) as precursors to obtain geopolymer cements, which achieved a maximum compressive strength of 25MPa.
87 citations
TL;DR: In this article, the effects of alkali cation type on high temperature response of fly ash geopolymers aiming towards structural applications were investigated and the underlying governing mechanisms have not been studied.
87 citations