Utilization of Construction Waste Composite Powder Materials as Cementitious Materials in Small-Scale Prefabricated Concrete

Figure 10

The C30-30% specimens after 50 and 100 salt solution freeze-thaw cycles. Note: from left to right, the concentrations of the NaCl solutions were 0% (i.e., under water freeze-thaw condition, for comparison), 2.5%, 3.5%, and 4.5%, respectively.

(a) After 50 cycles

(b) After 100 cycles