ABSTRACT
The basic hydration equation for cement hydration can be described in the following Eq. (1), which was originally created by Tomosawa [3]:
d dt
C r
k r D
r D k
α ρ
α α
=
×
−
⎛ ⎝⎜
⎞ ⎠⎟ + −( ) + ( )
1 1 1 1 1
( )v w+
(1)
where α = hydration degree of cement particle; v = stoichiometric ratio by the mass of water to mineral; w = physically bound water; ρc = density of cement; kd = reaction coefficient in a dormant period; r0 = radius of cement particles; De = effective diffusion coefficient of water; kr = coefficient of reaction rate for each mineral component; and Cw∞ = abundance concentration of water at the outer region of gel.
