Controlling the cohesion of cement paste.

摘要: The main source of cohesion in cement paste is the nanoparticles calcium silicate hydrate (C−S−H), which are formed upon dissolution original tricalcium (C3S). interaction between highly charged C−S−H particles presence divalent counterions strongly attractive because ion−ion correlations and a negligible entropic repulsion. Traditional double-layer theory based on Poisson−Boltzmann equation becomes qualitatively incorrect these systems. Monte Carlo (MC) simulations framework primitive model electrolyte solution then an alternative, where properly included. In addition to counterions, commercial Portland contains variety other ions (sodium, potassium, sulfate, etc.). influence high concentrations ionic additives as well pH stability final concrete construction investigated through MC grand canonical ensemble. results sh...