Hydration Characteristics and Microstructure of Alkali-Activated Slag Concrete: A Review

Fu, Qiang; Bu, Mengxin; Zhang, Zhaorui; Xu, Wenrui; Yuan, Qiang; Niu, Ditao

doi:10.1016/j.eng.2021.07.026

Cited by 101 publications

(32 citation statements)

References 121 publications

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“…The intensity of the diffraction peak gradually increases, representing more and more hydration products of gismondine. Compared with the blank sample, there is no new characteristic peak in the alkali-activated slag material with graphene, indicating that the addition of graphene does not induce the formation of other phases [13,16,36]. The results of XRD show that the more graphene dispersion is, the more conducive to the formation of zeolite phase in the product.…”

Section: Xrd Analysismentioning

confidence: 94%

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Wang

Liu

Hua

et al. 2023

Mater. Res. Express

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Alkali-activated coating materials have the problem of easy cracking. Alkali-activated materials are brittle and prone to shrinkage. When used as a coating, cracks appear on the surface. It will peel off from the substrate material and the adhesion will be reduced. In order to improve the crack resistance and adhesion of alkali-activated materials as repair and protective coatings, the effect of graphene on the properties of coatings was investigated. In this paper, a coating was prepared with blast furnace slag as the main raw material and sodium silicate water glass as the activator. By adding graphene dispersion to improve the microstructure and macroscopic properties of the coating. In the experiment, 0.2 %, 0.4 %, 0.6 %and 0.8 % graphene dispersions were added to the alkali-activated slag coating, and compared with the blank sample. The drying time, apparent properties and bonding strength of the coatings with different thicknesses were measured. It was found that the graphene dispersion could improve the crack resistance of the coating. The bonding strength of the coating at 7d and 28d was also improved. When 0.8 % was added, the maximum bonding strength was 1.577 MPa. Combined with XRD, FTIR and SEM, it was found that graphene dispersion may promote the formation of zeolite phase in alkali-activated slag coating and reduce the porosity at the interface between coating and substrate. This promotes chemical bonding at the interface. The experimental results show that the graphene dispersion is beneficial to improve the cracking of the coating and enhance the bond strength with cement mortar.

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Section: Xrd Analysismentioning

confidence: 94%

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Wang

Liu

Hua

et al. 2023

Mater. Res. Express

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show abstract

“…In parallel, a linear relationship was highlighted between the chloride coefficient and compressive strength (Figure 8). Both relationships should be due to the effect of the porosity decreasing within slag addition [58], which is discussed in the next section. The modification of the test method enables the comparison of results obtained for geopolymer concrete with reference methods dedicated to Portland cement concrete [33,41,42].…”

Section: Chloride Ion Penetration and Diffusion Coefficientmentioning

confidence: 99%

Mechanical Strength and Chloride Ions’ Penetration of Alkali-Activated Concretes (AAC) with Blended Precursor

et al. 2022

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The purpose of this study was to investigate the properties of hardened alkali-activated concrete, which is considered an eco-friendly alternative to Portland cement concrete. In this paper, the precursors for alkali-activated concrete preparations are blends of fly ash and ground-granulated blast-furnace slag in three slag proportions: 5%, 20%, and 35%, expressed as a percentage of fly ash mass. Thus, three concretes were designed and cast, denominated as AAC5, AAC20, and AAC35. Their physical and mechanical characteristics were investigated at 28 and 180 days, as well as their properties of chloride ion transport. The modified NT BUILD 492 migration test was applied to determine the chloride ions’ penetration of the alkali-activated concretes. Improvement of mechanical strength and resistance to chloride aggression was observed with ground-granulated blast-furnace slag content increase in the compositions of the tested concretes. Mercury intrusion porosimetry tests provided insight into the open pore structures of concretes. A significant decrease in the total pore volume of the concrete and a change in the nature of the pore diameter distribution due to the addition of ground granulated blast furnace slag were demonstrated.

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“…Alkali-activated concrete (AAC) has been considered a potential replacement for OPC concrete and one of the methods to produce more durable and environmentally friendly concrete [ 7 , 8 , 9 , 10 , 11 , 12 ]. This is due to the high chemical resistance of their alternative binders compared to traditional cementitious binders [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Mixture Proportion on the Performance of Alkali-Activated Slag Concrete Subjected to Sulfuric Acid Attack

et al. 2022

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Long-term deterioration and durability concerns in harsh environments with acidic attacks are considered as the weaknesses of ordinary Portland cement (OPC) concrete. Although the performance of alkali-activated slag concrete (AASC) has been reported to be superior in acidic environments, there is a poor understanding regarding the impacts of diverse mix design parameters on AASC durability in an acidic environment. This research aims to understand the impact of mix design parameters on the durability of AASC in the sulfuric acid (H2SO4) environment with pH = 3. The type of alkaline solution, the molarity of alkaline solutions, the weight ratio of alkaline solutions to slag, and the weight ratio of NaOH to Na2SiO3 are mix design parameters investigated in this study. The compressive strength reduction and weight loss were monitored from early ages up to 180 days. Moreover, an OPC concrete sample was produced as a reference.

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Hydration Characteristics and Microstructure of Alkali-Activated Slag Concrete: A Review

Cited by 101 publications

References 121 publications

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Mechanical Strength and Chloride Ions’ Penetration of Alkali-Activated Concretes (AAC) with Blended Precursor

The Effect of Mixture Proportion on the Performance of Alkali-Activated Slag Concrete Subjected to Sulfuric Acid Attack

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