Properties and microstructure of alkali-activated slag cement cured at below- and about-normal temperature

Gu, Ya-min; Fang, Yonghao; You, Duo; Guo, Yu; Zhu, Cancan

doi:10.1016/j.conbuildmat.2014.12.068

Cited by 102 publications

(44 citation statements)

References 34 publications

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“…ese compressive strength values compare favorably with those reported previously for mortars prepared from limestone and river sand aggregates, both of which gave lower values of ≤85 MPa at 28 d [3,25]. e relatively high drying shrinkage levels observed for the mortars were also impressive, which is likely to be due to the fine capillary nature of their mesoporous microstructures [26]. ere was the strong relationship between drying shrinkage and mesopore volume of the AAS mortars.…”

Section: Discussionsupporting

confidence: 75%

“…ere was the strong relationship between drying shrinkage and mesopore volume of the AAS mortars. e higher volumes of mesopores can lead to the larger drying Advances in Materials Science and Engineering shrinkage magnitudes due to the higher contracting stress derived from the finer capillary pores [26]. e interfacial transition zone between the aggregate and paste plays a key role in the development of compressive strength in the mortars [27].…”

Section: Discussionmentioning

confidence: 99%

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Pottery Sand as Fine Aggregate for Preparing Alkali‐Activated Slag Mortar

Jiao

Wang

Zheng

et al. 2018

Advances in Materials Science and Engineering

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Alkali-activated slag (AAS) mortars were prepared using pottery sand as a fine aggregate in a ratio of 1 : 1.75 using a blend of sodium silicate and NaOH as an alkaline activator at room temperature. e effects of sodium oxide content and silicate moduli on the setting time, fluidity, consistency, compressive strength, and drying shrinkage of different AAS mortars were determined. ese results revealed that sodium oxide content and silicate modulus had little effect on the setting time and workability of the mortar; however, they did have a significant effect on their mechanical performance and drying shrinkage levels. All the AAS mortars exhibited faster setting times, better workability, and higher early and late compressive strength compared to traditional mortars. Optimum compressive strength was achieved at 93 and 123 MPa after 1 d and 28 d, respectively, using a silicate modulus of 1.2 and Na 2 O content of 8%. e microstructures of mortars were characterized using scanning electron microscopy with energy dispersive spectrometric (SEM/EDS) and mercury intrusion porosimetry (MIP). ese results reveal that AAS mortars containing pottery sand as a fine aggregate may represent a promising building material with improved properties for use in the construction industry.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Pottery Sand as Fine Aggregate for Preparing Alkali‐Activated Slag Mortar

Jiao

Wang

Zheng

et al. 2018

Advances in Materials Science and Engineering

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“…In addition, the effect of temperature changes on the hydration reaction of AAS is also significant. Low temperature will prolong the AAS initial setting time [13], and an increase in the hydration temperature can significantly accelerate the rate of heat evolution and raise the reaction degree of AAS [14,15], but the late strength will be reduced when the temperature exceeds 80°C [16]. Apparent activation energy, like the hydration rate, can be used to characterize the sensitivity of the AAS hydration rate to temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and pH on Early Hydration Rate and Apparent Activation Energy of Alkali-Activated Slag

Tang

Chen

et al. 2019

Advances in Materials Science and Engineering

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In order to investigate the effect of temperature and pH on the early hydration rate of alkali-activated slag (AAS), NaOH was used as alkali activator, and the nonevaporable water (NEW) content of the slag paste at different temperatures (5, 20 and 35°C) and pH (12.10, 12.55, 13.02, and 13.58) was measured. On the basis of the Arrhenius formula, the hydration rate of slag was characterized by the content of nonevaporative water, and the apparent activation energy of slag hydration at different pH was also obtained. e early hydration rate of slag was significantly affected by temperature and pH of activator solution. e apparent activation energy E a of slag decreased with the increase of pH, and there was a good linear relationship between them. When pH was less than 13.02, increasing the temperature can accelerate the hydration rate of slag. However, under the condition of high pH (pH � 13.58), the hydration rate of slag was negatively correlated with temperature, which was related to the "shell forming" phenomenon of slag hydration.

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“…In the literature (Gu et al 2015;Cetin et al 2016;Rakhimova et al 2014;Rakhimova et al 2015;Gu et al 2014), BFS blended cement is reported to have the advantages of reducing hydration heat, enhancing longterm strength, and providing some resistance to chloride-induced damage and sulfates. At present, to utilize these advantages effectively, studies to resolve the disadvantages of BFS blended cement are actively being pursued.…”

Section: Introductionmentioning

confidence: 99%

Effect of Limestone Powder and Gypsum on the Compressive Strength Mixture Design of Blast Furnace Slag Blended Cement Mortar

Kim

Zhang

et al. 2017

ACT

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Journal of Advanced AbstractThis paper investigates the compressive strength development of blast furnace slag (BFS) blended mortar mixtures incorporating various mineral admixtures, namely BFS, limestone powder (LSP), and gypsum (CS). BFS replacement ratios of 15, 20, and 25 wt.%; LSP replacement ratios of 2, 3, 4, and 5 wt.%; and a CS replacement ratio of 2 wt.% are employed to improve the strength of BFS blended mortar mixtures. The hydration reaction and products resulting from the use of cement, BFS, and mineral admixtures are quantitatively examined with respect to the XRD/Rietveld method in order to investigate the relationship between the produced hydrates and the strength. Experimental investigation reveals that the mortar mixture with BFS 15 wt.%, LSP 4 wt.%, and CS 2 wt.% exhibits similar compressive strength to an ordinary Portland cement mortar mixture. In addition, the strength is found to be decreased as the BFS replacement ratio increases. At a BFS replacement ratio above 20 wt.%, LSP affects the strength improvement of BFS cement and CS affects the initial strength improvement of BFS cement.

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Properties and microstructure of alkali-activated slag cement cured at below- and about-normal temperature

Cited by 102 publications

References 34 publications

Pottery Sand as Fine Aggregate for Preparing Alkali‐Activated Slag Mortar

Pottery Sand as Fine Aggregate for Preparing Alkali‐Activated Slag Mortar

Effect of Temperature and pH on Early Hydration Rate and Apparent Activation Energy of Alkali-Activated Slag

Effect of Limestone Powder and Gypsum on the Compressive Strength Mixture Design of Blast Furnace Slag Blended Cement Mortar

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