Reduction in Drying Shrinkage and Efflorescence of Recycled Brick and Concrete Fine Powder–Slag-Based Geopolymer

It is an effective method to prepare geopolymer with recycled brick and concrete fine powder (RP) slag as main materials for the resource utilization of construction waste. However, its hydration products have large drying shrinkage high efflorescence risk under normal curing conditions. Until now, durability powder–slag-based (RPSG) has not been well documented, such efflorescence. In this study, effects content, alkali equivalent modulus on properties RPSG were evaluated. The results show: (1) Slag can significantly reduce RPSG. (2) potential increases increasing equivalent. increase in case a low (6 wt.% paper) decreases (3) modulus. contrast, degree RP-S45-M1.3N6 (slag content: 45 wt.%; equivalent: 6 modulus: 1.3) best proportional design excellent durability. Compared RP-S0-M1.3N6, reduced by 76.32%, capillary porosity 60.9%, visual alleviated, early pH value approximately 2.0. This paper systematically analyzed pattern RPSG, which positive significance promoting recycling RP from