Sulfuric acid resistance of fly ash based geopolymer concrete

Mehta, Ankur; Siddique, Rafat

doi:10.1016/j.conbuildmat.2017.04.077

Cited by 252 publications

(93 citation statements)

References 25 publications

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“…The specimens immersed in HCl and H 2 SO 4 solutions for 30 days exhibited different appearances, with softening of their outer surfaces and formations of amorphous silica. In general, it can be concluded that the IPs still retain acceptable to high strength, varying between 32.1 MPa and 37.5 MPa, even when immersed in acidic solutions for a period of 30 days, and a high stability with mass loss lower than 5% in comparison to 30-60% for conventional concrete specimens exposed to acidic environments [51].…”

Section: Durability Performance Of Selected Ipsmentioning

confidence: 90%

“…The specimens immersed in 1 M H 2 SO 4 solution for the same period showed also noticeable compressive strength loss (23.3%), whereas the specimens immersed in distilled water for 30 days exhibited the lower loss (13.8%). The reduction in strength is mainly attributed to the disintegration of alumina-silicate bonds, as indicated more clearly by the noticeable pH increase in the case of immersion in 1 M HCl solution [51].…”

Section: Durability Performance Of Selected Ipsmentioning

confidence: 97%

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Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

et al. 2019

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This paper explores the alkali activation potential of brick wastes and metallurgical slags. Inorganic polymers (IPs) were produced using an alkaline medium consisting of sodium hydroxide and sodium silicate solutions and the optimum synthesis conditions were determined. In this context, the variable parameters, such as solid to liquid (S/L) ratio, curing temperature (60, 80 and 90 °C) and ageing time (7 and 28 days) on the compressive strength and the morphology of the produced IPs were investigated. Specimens produced under the optimum synthesis conditions were subjected to high temperature firing and immersed in distilled water and acidic solutions for various periods of time, in order to assess their durability and structural integrity. The results showed that the IPs produced using a mix ratio of 50 wt % metallurgical slag and 50 wt % brick wastes, cured at 90 °C and aged for 7 days obtained the highest compressive strength (48.9 MPa). X-ray fluorescence analysis (XRF), particle size analysis, Fourier transform infrared spectroscopy (FTIR), mineralogical analysis (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis also confirmed the optimum microstructural characteristics and the chemical reactions that took place during synthesis. The overall results of this study indicate that the co-valorization of different waste streams, which are produced in large quantities and cause environmental problems if not properly managed, is a viable alternative for the production of binders or secondary construction materials with higher added value.

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Section: Durability Performance Of Selected Ipsmentioning

confidence: 90%

Section: Durability Performance Of Selected Ipsmentioning

confidence: 97%

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

et al. 2019

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“…Fly ash is an aluminosilicate material that is widely used for the preparation of geopolymer composites, especially low-calcium fly ash (LCF) (Nath and Sarker, 2017). In fact, one of the most important benefits of using fly ash for geopolymer synthesis is its easy availability compared to other source materials (Mehta and Siddique, 2017). In Thailand, most fly ash is obtained from burning lignite coal, which contains a large amount of calcium, or high-calcium fly ash (HCF).…”

Section: Introductionmentioning

confidence: 99%

Properties of high-calcium and low-calcium fly ash combination geopolymer mortar containing recycled aggregate

Nuaklong

Wongsa

Sata

et al. 2019

Heliyon

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This study presents the properties of a recycled aggregate geopolymer mortar made with a blend of high-calcium fly ash (HCF) and low-calcium fly ash (LCF). An experimental study was divided into two series. In series I, an effort was made to produce a more durable HCF geopolymer by partially replacing a portion of the HCF with LCF. A mortar with a 50:50 weight blend of HCF and LCF provided a high early strength and showed excellent potential in an acidic environment. In series II, recycled aggregate was used in the LCF-blended HCF geopolymer mortar. The results showed that the compressive strength of the geopolymer mortar decreased with an increase in the recycled aggregate content. The results also indicated that application of the mortar made with recycled aggregate under aggressive conditions should be avoided. However, a mixture with 25% recycled aggregate showed a compressive strength similar to that of the control mixture containing 100% natural aggregate.

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“…Furthermore, an appropriate addition of fly ash could enhance the resistance of concrete to sulfate attack and chloride penetration [22][23][24], thus reducing the risk of steel corrosion [25]. Other properties such as strength [6], acid resistance [26], wear resistance [27], and leaching properties [28] could be improved by replacing part of cement with fly ash. e specific surface area of the fly ash used in current practical engineering is between 300 and 400 m 2 /kg.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Feng

Sun

Yan

2018

Advances in Civil Engineering

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In this study, the ground fly ash is made of ordinary grade I fly ash by grinding. Compared with grade I fly ash, the influence of ground fly ash on cement hydration and mechanical property of mortar was investigated. e results show that ground fly ash can improve the hydration of cement at all the ages compared with grade I fly ash, and not only does its pozzolanic reaction start earlier, but the reaction degree is higher and the speed is quicker. Before 3 days, the contribution of ground fly ash to the strength is mainly due to physical filling and microaggregate effect. After that, the contribution of pozzolanic effect to the strength becomes obvious and can significantly increase the compressive strength after 60 days and the flexural strength after 28 days. e ground fly ash is better than grade I fly ash to optimize the pore structure of hardened pastes. It can significantly reduce the number of harmful pores (>20 nm) and increase the number of harmless pores (<20 nm), which refines the pore structure and makes the structure denser.

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Sulfuric acid resistance of fly ash based geopolymer concrete

Cited by 252 publications

References 25 publications

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

Properties of high-calcium and low-calcium fly ash combination geopolymer mortar containing recycled aggregate

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

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