Performance of GGBS Cement Concrete under Natural Carbonation and Accelerated Carbonation Exposure

Figure 4

Images of concrete specimens sprayed with phenolphthalein indicator (1 : 100% OPC (G0), 2 : 70% OPC (G30), 3 : 50% OPC (G50), and 4 : 30% OPC (G70)). Note. A B, C, and D represent 7, 150, and 180 days and 1-year exposure result for concrete groups in natural carbonation curing.