Fig. 11

XRD of mortar specimens at 28 days, (a) Quartz (SiO_2; PDF#11-0252), (b) Calcite (CaCO₃; PDF#47-1743), (c) C–S–H gel ((CaO)x(SiO₂)y(H₂O)z; PDF#29-0373), (d) Portlandite (Ca(OH)₂; PDF#04-0733), (e) Ettringite (3CaO·Al₂O₃·3CaSO₄·32H₂O; PDF#39-1381), (f) C2S (2CaO·SiO₂, PDF#39-0298)³⁰.