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 compressive strength of a geopolymer mortar with a liquid binder (L/B) ratio of 1 was determined and six different mixtures with an L/B ratio in the range from 1 to 0.5 were prepared.
Abstract: In this study, geopolymer mortars were prepared by replacing blast furnace slag (BFS) based mixtures with coarse fly ash (FA) in different proportions. The aim of this study was to build a geopolymer mortar design for high temperatures using constant NaOH molarity (M) and constant curing temperature. In addition to 14 M NaOH solution and BFS as the binder material at a 60 °C curing temperature, double binder mixture ratios were prepared adding 25%, 50% and 75% FA. Geopolymer mortars with a liquid binder (L/B) ratio of 1 were subjected to oven curing for 5, 24, 48, 168 h. After physical and mechanical tests, the samples with the highest compressive strength were determined and six different mixtures with an L/B ratio in the range from 1 to 0.5 were prepared in order to increase the compressive strength of the samples in question. The physical and mechanical tests were repeated for the new samples. After the tests, the mortar sample with the highest compressive strength and its high temperature behavior was determined. For this purpose, the mortar sample with the highest compressive strength was subjected to temperatures of 200, 400, 600, 800 and 1000 °C, and changes in the physical and mechanical properties was analyzed. As a result of the experiments, the highest flexural strength value (3.6 MPa) was obtained from the mortar samples with a 25% BFS content subjected to curing for 5 h. The highest compressive strength values (27.3 MPa) were obtained from the mortar samples with a 100% BFS content subjected to curing for 48 h. In terms of compressive strength, the optimization of the L/B ratio resulted in a 28% increase (0.7) and this way, 35.1 MPa was achieved. Following the high temperature tests, 400 °C and 600 °C were determined as critical temperatures for changes in mechanical properties and changes in physical properties, respectively. However, the geopolymer mortars lost around 58% of strength at 1000 °C which is the final temperature.
100 citations
TL;DR: In this paper, a detailed comparative study concerning the effect of elevated temperatures (up to 1200°C) on Class C and Class F fly ash-based geopolymer pastes is presented.
100 citations
TL;DR: In this paper, the authors investigated the effect of alkali activation on 2:1 clay minerals such as montmorillonite and illite and showed that they can be used as precursors for low carbon, low cost, geopolymer-stabilised construction materials.
100 citations
TL;DR: In this paper, the effect of variation in Si/Al molar ratio on the meso and macro-scale thermal stability of metakaolin geopolymers has been comprehensively investigated to discover the underlying mechanisms governing the performance.
100 citations
TL;DR: In this paper, the elastic properties of the reactive suspensions of metakaolin in sodium silicate solutions immediately after mixing were explained. But the early age mechanical properties of geopolymer mixes cannot be explained by the colloidal interactions between metakaol grains but rather by the formation of a gel with a molar ratio Si/Al.
100 citations