Abstract
The effect of carbonation on the abrasion resistance of alkali-activated slag (AAS) was investigated. Various activator sets were selected for synthesizing AAS specimens, and the compressive strength was measured before and after carbonation. The abrasion resistance of the specimens was measured in accordance with the ASTM C944 test method. The relationship between the mass loss caused by abrasion and compressive strength was analyzed to understand the effect of matrix strength on abrasion resistance. Test results showed that the decrease in compressive strength of AAS specimens by carbonation reduced their abrasion resistance. In addition, the abrasion resistance of AAS before and after carbonation was sensitively influenced by activator type. It can be concluded that additional caution is required when using AAS where abrasion may have occurred.
Highlights
Alkali-activated slag (AAS), an alternative binder material, has various advantages over ordinaryPortland cement (OPC)
K value increased as the amount of the ash and resistance to carbonation compared with ordinaryPortland cement (OPC) and its matrix strength may have decreased after
Could be reduced significantly after carbonation. It is well-known that the AAS has a lower resistance to carbonation compared with OPC and its matrix strength may have decreased after carbonation [20], which is shown in the present work
Summary
Alkali-activated slag (AAS), an alternative binder material, has various advantages over ordinaryPortland cement (OPC). Previous studies reported that AAS binder has excellent resistance against acid corrosion and sulfate expansion compared to conventional OPC [1,2,3,4,5]. This is attributed to the very dense microstructure of the AAS and its ability of ion binding [4,5]. It is expected that AAS can be used to manufacture cementitious products for sewage pipes or sealing plaster, which are exposed to environments rich in acid and sulfate These products face other types of degradation phenomena, such as abrasion and/or carbonation. The abrasion resistance of specimens with and without carbonation was measured by the ASTM C944 test method
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