Abstract
The poor carbonation resistance is one of the critical reasons that restrict the application of alkali-activated slag (AAS). Different contents of calcined Mg-Al layered double hydrotalcite (CLDH), Portland cement clinker (PCL) and MgO expansive agent (MEA) were adopted to improve the carbonation resistance of alkali-activated slag mortars (AASM). In addition to the workability, the effect of additives on the carbonation behavior was systematically investigated by means of the phenolphthalein test, scanning electron microscopy (SEM), X-ray diffraction (XRD), and N2 absorption. Results showed that all three additives could improve the carbonation resistance of AASM. In terms of carbonation resistance, the optimum contents of CLDH, PCL, and MEA were 6.0%, 2.0% and 4.0%, respectively. Microstructure analysis revealed that the improvements in the carbonation resistance were mainly attributed to the structure reconstruction of CLDH, hydration products promoted by PCL, and compensation shrinkage of MEA, respectively.
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