Simplified calculation of swelling behavior of hydrated bentonite

Under the assumption that pore spaces of bentonite were completely filled by swelling of montmorillonite,an expression of swelling volumetric strain of montmorillonite e_(sv)was obtained based on the former research of microstructure of bentonite.With e_(sv),the half distance between two layers of montmorillonite after hydration and the thickness of diffuse double layer based on Gouy-Chapman theory were calculated and compared.It is concluded that,with the computation parameters given,pore spaces of bentonite are completely filled by bound water when the water content is within the range of 80%-90%.