Durability of ambient cured alumina silicate concrete based on slag/fly ash blends against sulfate environment

Gopalakrishnan, R.; Chinnaraju, K.

doi:10.1016/j.conbuildmat.2019.01.153

Cited by 70 publications

(19 citation statements)

References 27 publications

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“…This behaviour of the FA/GBFS 80/20 concrete, which was not appreciable in samples with 100% FA (Valencia-Saavedra, Mejia de Gutiérrez and Gordillo, 2018), can be attributed to the presence of the blast furnace slag, a material that provides calcium to the system, generating hydrated calcium silicate gel as reaction product, in addition to the aluminosilicate gels proper to the alkaline activation of fly ash (C-A-S-H/N-A-S-H). This performance agrees with those reported by other authors (Manjunatha et al, 2014;Gopalakrishnan and Chinnaraju, 2019;Nath and Kumar, 2014). At 7 and 28 days for FA/GBFS concretes (80/20) designed with 400 kg/m 3 of precursor, Nath and Kumar (2014) reported compressive strength values similar to those obtained in the present study, although the proportions of activator and the characteristics of fly ash were different.…”

Section: Resultssupporting

confidence: 93%

Alkali-activated concretes based on fly ash and blast furnace slag: Compressive strength, water absorption and chloride permeability

2020

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Concretes based on alkaliactivated binders have attracted considerable attention as new alternative construction materials, which can substitute Portland Cement (OPC) in several applications. These binders are obtained through the chemical reaction between an alkaline activator and reactive aluminosilicate materials, also named precursors. Commonly used precursors are fly ash (FA), blast furnace slag (GBFS), and metakaolin. The present study evaluated properties such as compressive strength, rate of water absorption (sorptivity), and chloride permeability in two types of alkaliactivated concretes (AAC): FA/GBFS 80/20 and GBFS/OPC 80/20. OPC and GBFS/OPC* concretes without alkaliactivation were used as reference materials. The highest compressive strength was observed in the FA/GBFS concrete, which reported 26,1% greater strength compared to OPC concrete after 28 days of curing. The compressive strength of alkaliactivated FA/GBFS 80/20 and GBFS/OPC 80/20 was 61 MPa and 42 MPa at 360 days of curing, respectively. These AAC showed low permeability to the chloride ion and a reduced water absorption. It is concluded that these materials have suitable properties for various applications in the construction sector.

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Section: Resultssupporting

confidence: 93%

Alkali-activated concretes based on fly ash and blast furnace slag: Compressive strength, water absorption and chloride permeability

2020

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“…In contrast, physical deterioration and some signs of surface erosion was observed for the control sample immersed in the MgSO 4 solution after 6 months while all other samples showed no change in appearance In addition, no significant changes were observed in the weight of the samples after immersion in both solutions (not shown). those reported in [13,49], which found that the exposure to MgSO 4 caused more deterioration than to Na 2 SO 4 . Therefore, they concluded that the process of sulphate attack on NS-activated slag/fly ash binders strongly depends on the cation accompanying the sulphate.…”

Section: 3sulphate Resistancementioning

confidence: 69%

“…Recently, Gopalakrishnan and Chinnaraju [13] studied the sulphate resistance of silicateactivated slag/fly ash. They concluded that in sulphate environment AASF concrete with 40% fly ash performs well among all the mixes.…”

Section: Introductionmentioning

confidence: 99%

Performance of magnesia-modified sodium carbonate-activated slag/fly ash concrete

Abdalqader

Jin

Al‐Tabbaa

2019

Cement and Concrete Composites

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Various innovative research in the cement industry is looking into improving its environmental sustainability. Sodium carbonate-activated slag/fly ash (NC-SF) binders has recently evolved as a potentially more sustainable binding materials than both Portland cement and conventional alkali activated materials such as sodium silicate and sodium hydroxide activated materials. The reaction mechanism and some microstructural properties of NC-SF cements have been a major area of research recently. However, very few studies have scaled up the investigation of these binders into concrete specimens. This paper, therefore, provides new insight into the strength development and the durability performance of NC-SF concrete and MgO-modified NC-SF concrete. Concrete testing included measurements of compressive strength, split tensile strength, water absorption, depth of carbonation, sulphate exposure, acid exposure and elevated-temperature exposure. Microstructure studies were conducted using Powder X-Ray diffraction (PXRD), Thermogravimetric analysis (TGA) and Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR). It is concluded that NC-SF concrete mixes develop acceptable mechanical strength and demonstrate high resistance to sulphate attack. They also showed higher resistance to acid attack than the control mix based on sodium silicate-activated slag concrete. Here, emphasis is placed on the potential of developing NC-SF concrete with excellent performance and less complicated production methods as well as a low carbon footprint. It is also found that the use of reactive MgO enhanced the strength development of NC-SF concrete as well as its resistance to acid and carbonation.

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“…It was commonly concluded that the higher percentage of fly ash and slag within concrete decreases the durability and mechanical properties. This was also shown with a decrease of resistance when exposed to high temperatures [148][149][150][151].…”

Section: Fly Ash and Slag In Concretementioning

confidence: 62%

Current Sustainable Trends of Using Waste Materials in Concrete—A Decade Review

et al. 2020

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Concrete is the most used construction material in the world. Consequently, the mass extraction of virgin materials required for concrete production causes major environmental impacts. With a focus on promoting sustainability, numerous research studies on incorporating waste materials to replace virgin substances in concrete were undertaken. Despite this vast volume of published literature, systematic research studies on these sustainable concrete mixes that inform various stakeholders on current research trends, future research directions, and marketability options products are seldom conducted. This paper presents a decade review on sustainable concrete with a focus on virgin materials being replaced with waste materials. It aims to inform researchers of current research trends and gaps in the research area of waste material use in concrete. The review also identifies key parameters that restrict the marketability of these sustainable concrete products. The three-step research methodology involves a bibliometric assessment, a key review of selected waste materials, and an interview with a panel of experts focusing on impediments towards the transition of sustainable concrete products into the industry market. Bibliometric assessment was based on 1465 research publications in which five key materials (plastic, glass, fly ash, slag) and construction and demolition waste were selected for the review. The interview was conducted with ten industry experts to discuss the industry limitations in the commercial establishment of materials. The review of existing knowledge and the findings on sustainable concrete presented in this paper provide directions for both research academics and industry stakeholders to systematically focus on sustainable concrete products that are market-ready.

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Durability of ambient cured alumina silicate concrete based on slag/fly ash blends against sulfate environment

Cited by 70 publications

References 27 publications

Alkali-activated concretes based on fly ash and blast furnace slag: Compressive strength, water absorption and chloride permeability

Alkali-activated concretes based on fly ash and blast furnace slag: Compressive strength, water absorption and chloride permeability

Performance of magnesia-modified sodium carbonate-activated slag/fly ash concrete

Current Sustainable Trends of Using Waste Materials in Concrete—A Decade Review

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