Strength and Drying Shrinkage of Alkali-Activated Slag Paste and Mortar

Chi, Maochieh; Chang, Jiang‐Ren; Huang, Ran

doi:10.1155/2012/579732

Cited by 67 publications

(25 citation statements)

References 17 publications

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“…Optimization of the silicate modulus (1.2) and Na 2 O (8%) content gave AAS mortars with pottery sand that exhibited impressive maximal compressive strength levels of 93 and 123.2 MPa after 1 d and 28 d, respectively. 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].…”

Section: Discussionsupporting

confidence: 86%

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: 86%

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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“…It has been reported in many studies that silicate modulus (Ms: SiO 2 /Na 2 O) of 1.0-1.5 and Na 2 O to slag ratio of 4 % were appropriate to ensure an appropriate compressive strength of AAS paste (Wang and Scrivener 1995). Therefore, in the present study, the silicate modulus was chosen to be 1.2 and controlled by an addition of sodium hydroxide and water (Ravikumar and Neithalath 2013;Chi et al 2012). The Na 2 O/slag was fixed at 4 % for all the alkali activators.…”

Section: Proportion and Fabrication Process Of Porous Concretementioning

confidence: 98%

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim

Jang

Naeem

et al. 2015

International Journal of Concrete Structures and Materials

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In the present study, a porous concrete with alkali activated slag (AAS) and coal bottom ash was developed and the effect of carbonation on the physical property, microstructural characteristic, and heavy metal leaching behavior of the porous concrete were investigated. Independent variables, such as the type of the alkali activator and binder, the amount of paste, and CO 2 concentration, were considered. The experimental test results showed that the measured void ratio and compressive strength of the carbonated porous concrete exceeded minimum level stated in ACI 522 for general porous concrete. A new quantitative TG analysis for evaluating CO 2 uptake in AAS was proposed, and the result showed that the CO 2 uptake in AAS paste was approximately twice as high as that in OPC paste. The leached concentrations of heavy metals from carbonated porous concrete were below the relevant environmental criteria.

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“…Few researchers [12,[79][80][81] reported a lower drying shrinkage of AA FA binders in comparison with OPC binders while others reported a higher drying shrinkage of AAS binder than OPC binder [82][83][84][85]. However, the scientific reasoning behind the high drying shrinkage behaviour of AAS is still unknown.…”

Section: Drying Shrinkagementioning

confidence: 99%