Effect of Nano-CaCO₃ on the Mechanical Properties and Durability of Concrete Incorporating Fly Ash

Table 1

Chemical composition of ordinary Portland cement and fly ash (%).

Type	SiO2	Al2O3	Fe2O3	CaO	MgO	SO3	K2O	Na2O	Ti2O	P2O5
OPC	22.13	7.35	3.93	61.22	4.07	1.52	0.47	0.99	0.35	0.05
FA	53.30	29.68	5.60	8.07	1.45	1.14	1.54	—	—	—

Note. OPC: ordinary Portland cement; FA: fly ash.