Effects of carbonation curing on chemical attack in cement paste incorporating liquid-crystal display glass powder as a partial binder replacement

초록

This study investigates the chemical resistance of cement paste by incorporating liquid -crystal display (LCD) glass powder as a partial replacement for cement. The samples, cured under water and carbonation, were subjected to adverse chemical attacks over a period of up to 90 days, using MgSO 4 and H 2 SO 4 for the sulphate attack and acid attack, respectively. The results demonstrate a decrease in compressive strength by upto 14.63 % and 32.32 % for water- and carbonation -cured samples, respectively, and an increase in carbonation degree by upto 100 % with the incorporation of glass powder at 28 days. Under sulphate attack, water curing and carbonation curing displayed strength increase of 21.24 -36.13 % and 7.56 -8.06 %, respectively, at 90 days. However, carbonation -cured samples experienced greater leaching of silica and calcium. The compressive strength decreased with acid attack duration, with glass powder incorporation mitigating strength loss in carbonation -cured samples. At 30 days, with an incorporation rate of 30% glass powder, the strength loss was reduced by 37.66 % for the carbonation -cured samples. The enhanced resistance with incorporation of glass powder was also evident from mercury intrusion porosimetry results that indicated decreased intrusion levels. Visual inspection revealed a different consistency of white substance deposition, suggesting resistance mechanisms differed between curing methods.

키워드