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, a systematic approach for selecting mix proportions for alkali activated fly ash-based geopolymer concrete (GPC) is presented for low calcium Class F fly ash activated geopolymers using sodium silicates and sodium hydroxide as activator solutions.
161 citations
TL;DR: In this paper, the influence of different curing temperatures, calcium content and different types of alkali activator solutions on properties of geopolymer mortars (GPM) containing industrial and agricultural wastes, such as granulated blast furnace slag (GBFS), fly ash (FA) and palm oil fuel ash (POFA), was reported.
161 citations
TL;DR: In this article, a metakaolinite-based geopolymer of molar ratios Si/Al and Na/Al of 2 and 1 respectively was studied for the same curing schedule.
Abstract: The curing at ambient and controlled relative humidity (RH) with mild heating (40–60°C) of a metakaolinite-based geopolymer of molar ratios Si/Al and Na/Al of 2 and 1 respectively was studied. To obtain these geopolymers in a crack-free state, rapid drying during curing should be avoided. Curing at a lower RH (e.g. 30%) is preferable to that at a higher RH (e.g. 70%). Curing in an RH oven does not offer any advantage over curing at ambient followed by mild heating (40–60°C) in sealed containers. The compositions of the geopolymers were then varied somewhat to see the effect on open porosity for the same curing schedule. The compositions with Si/Al = 1.86 and Na/Al < 0.8 had an increased tendency to crack, probably due to the larger water loss during curing. The lowest open porosity of <1% was obtained for a geopolymer of composition Si/Al = 2.14 and Na/Al = 0.87, but this developed some cracks after 1 year. However, the geopolymer of composition, Si/Al = 2, Na/Al = 1, on which most of the work was carried out when cured correctly did not crack even after 1 year.
161 citations
TL;DR: In this article, the effect of increasing slag content and activator dosage on the sulfuric acid resistance of fly ash geopolymer (GP) binders has been investigated and compared with Portland cement (PC) mix using various physical and microstructural techniques.
160 citations
01 Jan 2004
TL;DR: In this article, the authors introduced two types of sustainable cementitious composites, geopolymer and magnesium phosphate cement, which possess some common and individual characteristics compared with Portland cement concrete.
Abstract: Portland cement (PC) concrete is the most popular and widely used building material because its raw materials are available over the world. This paper introduces two types of sustainable cementitious composites, geopolymer and magnesium phosphate cement. Compared with PC, these two cements possess some common and individual characteristics. The paper presents recent developments of these two materials. Investigation has shown that they have superior properties compared to PC such as high early strength, excellent volume stability, better durability, good fire resistance, and easy manufacture process.
160 citations