Effects of Nano-CaCO₃/Limestone Composite Particles on the Hydration Products and Pore Structure of Cementitious Materials

Table 1

Chemical composition of cement and limestone (%).

Oxide	Portland cement	Limestone
SiO2	21.06	4.38
Al2O3	6.13	1.56
Fe2O3	2.61	0.76
CaO	61.18	48.00
MgO	1.66	0.49
K2O	1.06	0.14
Na2O	0.21	0.03
SO3	3.18	—
Loss	2.12	44.17
Others	0.80	0.13