Resistance of fly ash based geopolymer mortar to both chemicals and high thermal cycles simultaneously

Shill, Sukanta Kumer; Al‐Deen, Safat; Ashraf, Mahmud; Hutchison, W. D.

doi:10.1016/j.conbuildmat.2019.117886

Cited by 84 publications

(41 citation statements)

References 96 publications

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“…Geopolymer-based products are increasingly beginning to appear on the market. In recent years, geopolymers have been considered some of the most interesting and promising building materials [ 16 , 17 ]. There are many types of geopolymers, and they have interesting applications.…”

Section: Introductionmentioning

confidence: 99%

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Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

et al. 2021

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This paper presents the results of research on geopolymer composites based on fly ash with the addition of melamine fibers in amounts of 0.5%, 1% and 2% by weight and, for comparison, without the addition of fibers. The melamine fibers used in the tests retain their melamine resin properties by 100% and are characterized by excellent acoustic and thermal insulation as well as excellent filtration. In addition, these fibers are nonflammable, resistant to chemicals, resistant to UV radiation, characterized by high temperature resistance and, most importantly, do not show thermal-related shrinking, melting and dripping. This paper presents the results of density measurements, compressive and flexural strength as well as the results of the measurement of thermal radiation changes in samples subjected to a temperature of 600 °C. The results indicate that melamine fibers can be used as geopolymer reinforcement. The best result was achieved for 0.5% by weight amount of reinforcement, approximately 53 MPa, compared to 41 MPa for a pure matrix. In the case of flexural strength, the best results were obtained for the samples made of unreinforced geopolymer and samples with the addition of 0.5% by weight of melamine fibers, which were characterized by bending strength values above 9 MPa, amounting to 10.7 MPa and 9.3 MPa, respectively. The thermal radiation measurements and fire-jet test did not confirm the increasing thermal and fire resistance of the composites reinforced by melamine fiber.

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Section: Introductionmentioning

confidence: 99%

“…Numerous studies in the literature mainly present geopolymers as alternatives to cement for structural applications. Recently, several publications have appeared indicating their potential as thermal barriers [ 16 , 17 ]. These studies indicate that geopolymers can achieve high thermal stability and fire resistance.…”

Section: Introductionmentioning

confidence: 99%

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

et al. 2021

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“…In the particular case of alkali-activated mortars, some authors point out that the excess of incorporated air is harmful to the mortars for another reason: the internal air bubbles are preferred places for the accumulation of sodium, potassium, or any other alkali metal involved in the alkaline activation reaction [ 25 ]. Alkaline ions do not chemically bind to the gels formed in the alkaline activation reaction, locating themselves in the interstices of the material.…”

Section: Introductionmentioning

confidence: 99%

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

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“…Thus, to tackle these problems of FA and any other waste materials; efforts have been made towards re-use of them in an efficient and green way, for instance, high volume researchersresearchersresearchersresearchers have used FA have used FA have used FA have used FA to replace Portland cement in different types of concrete and cementitious composites [40][41][42][43][44][45][46]. More recently, FA has been utilized as an alternative source to make geopolymer paste [47,48], mortar [49,50], and concrete [51,52]. For the production of FA-GPC, some reactions take place between alkali liquids and FA.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength of Geopolymer Concrete Composites: Modeling and Comprehensive Systematic Review

Ahmed

Mohammed

2021

Preprint

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The growing concern about global climate change and its adverse impacts on societies is putting severe pressure on the construction industry as one of the largest producers of greenhouse gases. Given the environmental issues associated with cement production, geopolymer concrete has emerged as a sustainable construction material. Geopolymer concrete is cementless concrete that uses industrial or agro by-product ashes as the main binder instead of ordinary Portland cement; this leads to being an eco-efficient and environmentally friendly construction material. Compressive strength is one of the most important mechanical property for all types of concrete composites including geopolymer concrete, and it is affected by several parameters like an alkaline solution to binder ratio (l/b), fly ash (FA) content, SiO2/Al2O3 (Si/Al) of the FA, fine aggregate (F) and coarse aggregate (C) content, sodium hydroxide (SH) and sodium silicate (SS) content, ratio of sodium silicate to sodium hydroxide (SS/SH), molarity (M), curing temperature (T), curing duration (CD) inside the oven and specimen ages (A). In this regard, a comprehensive systematic review was carried out to show the effect of these different parameters on the compressive strength of the fly ash-based geopolymer concrete (FA-GPC). In addition, multi-scale models such as Artificial Neural Network (ANN), M5P-tree (M5P), Linear Regression (LR), and Multi-logistic Regression (MLR) models were developed to predict the compressive strength of FA-GPC composites. For the first time, in the modeling process, twelve effective parameters including l/b, FA, Si/Al, F, C, SH, SS, SS/SH, M, T, CD, and A were considered the modeling input parameters. Then, the efficiency of the developed models was assessed by various statistical assessment tools like Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), Scatter Index (SI), OBJ value, and the Coefficient of determination (R2). Results show that the curing temperature, sodium silicate content, and ratio of the alkaline solution to the binder content are the most significant independent parameters that influence on the compressive strength of the FA-GPC, and the ANN model has better performance for predicting the compressive strength of FA-GPC in compared to the other developed models.

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Resistance of fly ash based geopolymer mortar to both chemicals and high thermal cycles simultaneously

Cited by 84 publications

References 96 publications

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Compressive Strength of Geopolymer Concrete Composites: Modeling and Comprehensive Systematic Review

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