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 paper, the effect of nonevaporable water on the strength variation of geopolymers was firstly analyzed and it was shown that it is necessary to keep the strength stable and the optimum content was about 7.4%.
476 citations
TL;DR: In this paper, the role of calcium in geopolymerisation was investigated and the effect of different calcium silicates on the performance of different matrices was found to depend most significantly on the crystallinity of the calcium silicate source and the alkalinity of activating solution used.
455 citations
TL;DR: In this paper, a series of geopolymer composites were prepared containing 10−20% of various granular inorganic fillers ranging from waste demolition materials through mineral tailings to engineering ceramics.
454 citations
TL;DR: A conceptual model for geopolymerisation is presented, allowing elucidation of the individual mechanistic steps involved in this complex and rapid process, based on the reactions known to occur in the weathering of aluminosilicate minerals under alkaline conditions.
449 citations
TL;DR: In this paper, the authors present a study on geopolymers and aggregates made with class F fly ash and evaluate strength loss due to thermal damage, showing that the aggregates steadily expanded with temperature, reaching about 1.5-2.5% expansion at 800-°C.
Abstract: This paper presents a study on geopolymers and geopolymer/aggregate composites made with class F fly ash. Samples were heated up to 800 °C to evaluate strength loss due to thermal damage. The geopolymers exhibited strength increases of about 53% after temperature exposure. However, geopolymer/aggregate composites with identical geopolymer binder formulations decreased in strength by up to 65% after the same exposure. Test data from dilatometry measurements of geopolymers and aggregates provides an explanation for this behavior. The tests show that the aggregates steadily expanded with temperature, reaching about 1.5–2.5% expansion at 800 °C. Correspondingly, the geopolymer matrix undergoes contraction of about 1% between 200 °C and 300 °C and a further 0.6% between 700 °C and 800 °C. This apparent incompatibility is concluded to be the cause of the observed strength loss. This study presents the results of 15 different geopolymer combinations (i.e. mixture proportions, curing and age) and four different aggregates.
444 citations