The effect of high temperature on the design of blast furnace slag and coarse fly ash-based geopolymer mortar

Kürklü, Gökhan

doi:10.1016/j.compositesb.2016.02.043

Cited by 122 publications

(44 citation statements)

References 53 publications

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“…e diffraction patterns of FA geopolymers with Si/Al ratio of 1.9 at room temperature show that the phases of the geopolymers are mullite ( peaks. At 900°C, mullite appears earlier and more albite peaks appear [73]. XRD analysis of MK geopolymers shows that the main phases of MK geopolymers are feldspar and quartz without heating.…”

Section: Mineralogical Characteristics Of Geopolymersmentioning

confidence: 99%

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Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

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Geopolymers are prepared by alkali solution-activated natural minerals or industrial waste materials, which have been widely used as new sustainable building and construction materials for their excellent thermal and mechanical properties. The thermal and mechanical properties of geopolymers at high temperature have attracted great attention from many researchers. However, there are few systematic works concerning these two issues. Therefore, this work reviewed the thermal and mechanical behaviors of geopolymers at high temperature. Firstly, the thermal properties of geopolymers in terms of mass loss, thermal expansion, and thermal conductivity after high temperature were explained. Secondly, the mechanical properties of residual compressive strength and stress-strain relationship of fly ash geopolymers and metakaolin geopolymers after high temperature were analyzed. Finally, the microstructure and mineralogical characteristics of geopolymers upon heating were interpreted according to the changes of microstructures and compositions. The results show that the thermal properties of geopolymers are superior to cement concrete. The geopolymers possess few mass loss and a low expansion ratio and thermal conductivity at high temperature. The thermal and mechanical properties of the geopolymers are usually closely related to the raw materials and the constituents of the geopolymers. Preparation and testing conditions can affect the mechanical properties of the geopolymers. The stress-strain curves of geopolymer are changed by the composition of geopolymers and the high temperature. The silicon-type fillers not only improve the thermal expansion of the geopolymers but also enhance mechanical properties of the geopolymers. But, they do not contribute to reducing the thermal conductivity. the different raw materials, aluminosilicate precursor and reinforcement materials, result in different geopolymer damage during the heating. However, phase transitions can occur during the process of heating regardless of the raw materials. The additional performance enhancements can be achieved by optimizing the paste formulation, adjusting the inner structure, changing the alkali type, and incorporating reinforcements.

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Section: Mineralogical Characteristics Of Geopolymersmentioning

confidence: 99%

“…e strength loss at high temperature is caused by the disappearance of chemically bound water in calcium rich gel containing high concentration slag, which results in cavity structure and phase separation [73].…”

Section: Differences Of Aluminosilicate Raw Materialsmentioning

confidence: 99%

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

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“…Density increased with the increase of fine materials (BFS) and that has promoted an increase in compressive strength. In this particular study [12], the cure conditions were 48 h at 60 • C. Longer curing times at 60 • C has decreased compressive strength. Introduction of BFS in metakaolin (MK) activated mortars has shown advantages such as reduction of alkaline activation solution to maintain workability and also improvement in mechanical strength [13].…”

Section: Introductionmentioning

confidence: 93%

“…A study on geopolymer mortars with blast furnace slag (BFS) and coarse fly ash (FA) found that longer curing times reduces the water absorption and porosity of geopolymers [12]. Density increased with the increase of fine materials (BFS) and that has promoted an increase in compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Mine Tailings Geopolymers as a Waste Management Solution for A More Sustainable Habitat

et al. 2019

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The demand for low environmental impact of materials in our habitat is one of the current societal challenges. Along with other solutions of waste valorisation, alkali activation as geopolymers can be one possible solution of waste valorisation because they may allow, for instance, an alternative solution for cement-based materials in some applications and it is one contribution for circular economy. This work has focused on the development and processing of geopolymers that incorporates as a fine aggregate a high-sulfidic mining waste (mine tailing), a difficult waste to process. Rheology analysis was applied as an important step to understand not only the geopolymers behaviour but also its transition from the fresh to the hardened state. The effect of precursor binder type (metakaolin or blast furnace slag), of mine tailing content and also the effect of temperature and curing conditions of different formulations were studied in this solution. It was possible to conclude that although this particular mine tailing is not a geopolymer binder precursor, it may be incorporated as an alternative fine aggregate in construction products. Furthermore, rheology could be used to follow up the geopolymer alkali-activation process and even to setup proper curing conditions and components contents in order to optimize the final mechanical strength of this material as a waste management solution. The final properties of these geopolymers compositions were adequate and after 28 days of curing, these geopolymers exhibit significant chemical resistance under severe test conditions.

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“…Besides, the development of hybrid geopolymer-based materials has been of a critical importance, as well, recently [7][8][9]. The most commonly used aluminosilicate substance in casting of geopolymer based concrete is FA, GGBFS and calcined kaolin [10][11][12][13]. Amongst those, FA and GGBFS are waste materials which can be used as substitutional cementitious materials for the concrete.…”

mentioning

confidence: 99%

24Modeling Compressive Strength of Lightweight Geopolymer Mortars by Step-Wise Regression and Gene Expression Programming

Mermerdaş¹,

Oleiwi²,

Abid³

2019

Hittite J. Sci. Eng.

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T he great need for concrete results in depletion of huge quantities of cement. This causes a manufacture of equal amount of cement with an excessive amount of carbon dioxide emissions. CO 2 emissions from cement production are an important factor causing air pollution. The risk of ecological imbalance should also be taken into account because of the continuous consumption of natural resources. Greenhouse gas emissions from cement production are estimated to be 6-7% of the total [1,2]. Geopolymer, an innovative eco-friendly inorganic binder material obtained using industrial waste powders, can be taken into account as an alternative binder to the cement based system. There are lots of aluminosilicate based materials available in nature. Moreover,

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The effect of high temperature on the design of blast furnace slag and coarse fly ash-based geopolymer mortar

Cited by 122 publications

References 53 publications

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Mine Tailings Geopolymers as a Waste Management Solution for A More Sustainable Habitat

24Modeling Compressive Strength of Lightweight Geopolymer Mortars by Step-Wise Regression and Gene Expression Programming

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