期刊
SUSTAINABILITY
卷 14, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/su14052652
关键词
alkali activated mortar; silica fume; magnesium sulfate; sodium sulfate; sulfuric acid
资金
- Thailand Science Research and Innovation (TSRI) under the Fundamental Fund 2022 [2022]
- Thammasat University Research Unit in Structural and Foundation Engineering, Thammasat University
This study investigated the effects of silica fume addition and curing temperature on the compressive strength and durability of alkali-activated mortars. It was found that the optimal content of silica fume was 6%, which provided a compressive strength as high as that of mortars cured at 45 degrees C. The alkali-activated mortars performed better in terms of acid and sulfate resistance compared to ordinary Portland cement mortars.
Although elevated temperature curing can increase the compressive strength of alkali-activated mortar, its field applications are still limited. In this study, alkali-activated mortars were prepared using high calcium fly ash (FA) as a precursor. Small amounts of silica fume were used to partially replace high calcium fly ash at 3-9% by weight to increase the strength of alkali-activated mortar. All mixtures had a liquid to binder ratio of 0.60 and sand to binder ratio of 2.75 by weight. A ratio of NaOH to Na2SiO3 solution was kept at 2:1 by weight. Mortar flow was also held between 105-115 using a superplasticizer. Compressive strength and durability were investigated in terms of acid and sulfate resistance. The effects of silica fume addition and curing temperature on compressive strength were found to be significant. The optimum content of silica fume was 6%, providing compressive strength as high as that of alkali-activated mortars cured at 45 degrees C. The weight loss of alkali-activated mortar due to sulfuric acid attack decreased with increasing silica fume content and curing temperature. All alkali-activated mortars were found to have a better performance than (ordinary) Portland cement (OPC) mortars and mortars containing 40% FA. Alkali-activated mortars immersed in magnesium sulfate solutions had compressive strength that decreased with an increase in curing temperature. The expansion of alkali-activated mortar due to sodium sulfate attack increased with increasing silica fume content, and the expansion decreased with increased curing temperature. All alkali-activated mortars performed better than OPC mortars after 98 days of sulfate attack.
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