Effect of GGBFS on Workability and Strength of Alkali-activated Geopolymer Concrete

Gautam, Kumar; Mishra, Shambhu Sharan

doi:10.28991/cej-2021-03091708

Cited by 15 publications

(5 citation statements)

References 33 publications

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“…Unreacted fly ash tends to form defects after the matrix hardens, while slag has relatively high activity during the reaction process to form a matrix with great strength and a dense microstructure. However, excessive slag content in concrete can result in excessive shrinkage, shortened setting time, and reduced fluidity [27,[45][46][47]. Moreover, considering the working performance of concrete and the influence of the water-to-cement ratio, the final GGBFS/FA was determined to be 3/1, and the water-to-binder ratio was 0.4 [27,47].…”

Section: Experimental Design 221 Mixture Designmentioning

confidence: 99%

“…However, excessive slag content in concrete can result in excessive shrinkage, shortened setting time, and reduced fluidity [27,[45][46][47]. Moreover, considering the working performance of concrete and the influence of the water-to-cement ratio, the final GGBFS/FA was determined to be 3/1, and the water-to-binder ratio was 0.4 [27,47]. According to the literature, two-component activation with an alkali dosage of 7% was used in this experiment, in which the two alkali solutions were mixed with SiO 2 /Na 2 O at a ratio of 0.95 [27,[48][49][50].…”

Section: Experimental Design 221 Mixture Designmentioning

confidence: 99%

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Compressive Behaviors of High-Strength Geopolymeric Concretes: The Role of Recycled Fine Aggregate

Zhong,

Fu,

Feng

et al. 2024

Buildings

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In this study, natural fine aggregates (NFAs) in high-strength fly ash (FA)/ground granulated blast furnace slag (GGBFS)-based geopolymer concretes were both partially and completely replaced by RFAs to prepare geopolymer recycled fine aggregate concrete (GRFC). Herein, the impacts of RFA content (0%, 25%, 50%, 75%, and 100%) on the fresh and hardened performance and microstructural characteristics of a GRFC were investigated. The results indicated that with increasing RFA substitution ratio, the setting time of the GRFC decreases. In addition, the compressive strength and elastic modulus decrease. However, owing to the enhanced adhesion of the geopolymer matrix and recycled aggregate, RFA has a relatively small impact on the compressive strength, with a maximum strength loss of 9.7% at a replacement level of 75%. When the RFA content is less than 75%, the internal structure of the concrete remains relatively compact. The incorporation of RFA in concrete has been found to adversely affect its compressive strength and elastic modulus, while simultaneously increasing its brittleness. The increase in dosage of RFA leads to a reduction in the compressive strength and elastic modulus of concrete, while partial failure occurs when the GRFC constitutes 100% of the RFA. The existing stress–strain model for conventional concrete is recalibrated for the GRFC. Observed by SEM, with increasing RFA, the damage is mainly concentrated at the interface associated with the attached cement. Although the recalibrated model predicts the stress–strain responses of the GRFC reasonably well, an acceptable range of deviation is present when predicting the residual stress due to the relatively high strength and brittle behavior of the GRFC during compression. Through this research, the applicability of RFA is expanded, making it feasible to apply large quantities of this material.

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Section: Experimental Design 221 Mixture Designmentioning

confidence: 99%

Section: Experimental Design 221 Mixture Designmentioning

confidence: 99%

Compressive Behaviors of High-Strength Geopolymeric Concretes: The Role of Recycled Fine Aggregate

Zhong,

Fu,

Feng

et al. 2024

Buildings

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show abstract

“…Several recent research has discovered that organic and inorganic waste can be used as cementitious material since they are similar to cement. Fly ash [8][9][10] and blast furnace slag [11][12][13] are two commodities that have been successfully commercialized for construction materials and received positive feedback. Meanwhile, rice husk ash [14][15][16], bagasse ash [17][18][19], palm oil waste [20][21][22], and Kaolin [23][24][25] are among the materials being researched as alternatives for cement replacement.…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Concrete Made with Coal Bottom Ash as Sustainable Construction Materials

et al. 2022

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Concrete is considered one of the construction materials that contribute the most significant carbon dioxide in the world. Meanwhile, according to various studies, concrete production will continue to rise through 2050, especially in developing countries. According to several reports, cement manufacture is one of the largest sources of carbon dioxide in the concrete sector. In addition, overexploitation of aggregates due to concrete production also causes unavoidable natural damage. Bottom ash waste was used as a replacement for cement and fine aggregate as sustainable construction materials. It is envisaged that this research would allow industrial waste to be utilized to its full potential, resulting in a concrete that is more environmentally friendly and minimizes carbon dioxide emissions during the manufacturing process. This study is divided into bottom ash as a cement substitute and bottom ash as a fine aggregate substitute. The engineering properties of the concrete were checked during the experiments in this study when it was fresh and hardened states. The slump test is used to determine the workability of fresh concrete. While for the hardened properties tests consist of compressive strength, splitting tensile strength, flexural strength, and mass density. The usage of bottom ash as a cement replacement demonstrates that as the composition of bottom ash increases, the performance of the hardened properties of concrete decreases. While using bottom ash as a fine aggregate replacement reveals that the performance of hardened properties has improved as the proportion of bottom ash utilized has increased. Doi: 10.28991/CEJ-2022-08-01-014 Full Text: PDF

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“…However, cement production requires a large volume of natural resources and discharges a high volume of CO2 into the atmosphere, leading to environmental pollution and climate change [1][2][3]. Meanwhile, ground granulated blast furnace slag (GGBFS), a byproduct of the process of creating steel, has been widely utilized in the world as a supplementary material to produce concrete [4][5][6]. It was also applied as a binder material in the production of mortar [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Effect of GGBFS Content on Mechanical and Durability Properties of High-Strength Mortars

2022

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As a large amount of steel is produced for the industrialization and modernization of Vietnam, a correspondingly large quantity of steel slag is also released annually. Besides, the demand for mortar is increasing due to urbanization, especially for the high-strength and durability mortar used for important constructions and structures in aggressive environmental areas. This study aims to carry out further research into high-strength mortars incorporating ground granulated blast furnace slag (GGBFS). The control mixture was designed with a water-to-binder ratio of 0.2, and the amount of silica fume used was equal to 25% of the total binder amount by mass. Four other mixtures were designed using GGBFS to substitute for 15, 30, 45, and 60% of cement by mass. The engineering properties of fresh and hardened mortars were comprehensively investigated, especially the durability properties. The microstructure of these mortars was also examined using scanning electron microscopy. Test results show that replacing 15 or 30% of cement with GGBFS yields an improvement in mortar's strength and durability properties. All the mortars in this study show excellent qualities with high strength, low water absorption, and high resistance to chloride attack. Moreover, the presence of GGBFS reduces the shrinkage of mortar caused by the drying process. Doi: 10.28991/CEJ-2022-08-05-07 Full Text: PDF

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Effect of GGBFS on Workability and Strength of Alkali-activated Geopolymer Concrete

Cited by 15 publications

References 33 publications

Compressive Behaviors of High-Strength Geopolymeric Concretes: The Role of Recycled Fine Aggregate

Compressive Behaviors of High-Strength Geopolymeric Concretes: The Role of Recycled Fine Aggregate

Engineering Properties of Concrete Made with Coal Bottom Ash as Sustainable Construction Materials

Assessing the Effect of GGBFS Content on Mechanical and Durability Properties of High-Strength Mortars

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