A Prediction Method of Tensile Young's Modulus of Concrete at Early Age

Table 1

Physical and chemical compositions of cement.

	Ordinary Portland cement
Density	3.14 g/cm^3
Blaine fineness	3340 cm^2/g
Setting time start-end	2 h 26 m–3 h 34 m
Comp. strength at 3 days	30.8 MPa
at 7 days	46.3 MPa
at 28 days	63.6 MPa
Chemical compositions
CaO	64.5%
SiO2	20.5%
Al2O3	5.7%
Fe2O3	2.9%
MgO	1.27%
SO3	2.15%
Cl^-	0.009%
Loss of ignition	1.89%