研究目的
To investigate the effect of GGBFS and FA on the heat of hydration, compressive strength and volume stability of rMgO-PC mortars during the process of drying, carbonation curing and sulfate solution immersion.
研究成果
The incorporation of 10% GGBFS or 10% FA increases the carbonation degree of the rMgO-PC system and improves its volume stability during sulfate exposure. The formation of ettringite and gypsum is the main reason for expansion in mortars with 0% and 30% rMgO replacement levels during sulfate exposure. The study suggests further investigation on mechanical properties and environmental impact of carbonated ternary system of rMgO-PC-SCMs.
研究不足
The study focuses on the sulfate resistance of carbonated ternary mortar blends under specific conditions. The long-term performance under varying environmental conditions and the scalability of the findings to real-world applications require further investigation.
1：Experimental Design and Method Selection:
The study compares the effect of GGBFS and FA on the properties of mortar systems containing both r-MgO and Portland cement (rMgO-PC) as binder.
2：Sample Selection and Data Sources:
Twelve mixes of rMgO-PC-SCMs mortar were designed with rMgO replacement levels of 0%, 30%, 50% and 70%.
3：0%. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: General use PC (CSA Type GU), rMgO, Type F FA, GGBFS, and classi?ed quartz sand based on ASTM C
4：Experimental Procedures and Operational Workflow:
7 Mortar specimens were cast and cured in an environment of 23 ± 2 °C and a relative humidity of 95% for one day, then demolded and stored in an ambient lab environment for two days of drying, followed by 28 days of carbonation curing, and finally immersed in 50 g/L Na2SO4 solutions for 24 months.
5：Data Analysis Methods:
Thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the chemical composition and microstructure of specimens.
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