Abstract
Structural changes occurring during creep and shrinkage of pure calcium silicate pastes were investigated. The tests included determination of pore structure and surface area by adsorption of H 2O and N 2. Helium inflow tests were also carried out. The degree of silicate polymerization was analyzed using the trimethylsilyl method. Penetration of He and H 2O into the pore system is unaffected by the creep and shrinkage of the pastes. At low degrees of hydration drying decreases the N 2 surface area S(N 2), and increases the amount of highly polymerized silicate, while loading does not affect S(N 2) but inhibits the additional polymerization that can occur on drying. At high degrees of hydration, drying causes a slight reduction in S(N 2) while loading increases it. Drying, and especially loading and drying, promote silicate polymerization while loading without any drying does not induce significant changes.
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