Interaction of polymers with portland cement during hydration: A study of the chemistry of the pore solution of polymer-modified cement systems

摘要: Abstract The mechanism of interaction polymers with the hydration products portland cement has been studied. data were obtained by squeezing pore solutions from pastes an appropriate solution expression device, followed immediately chemical analyses clear solution. Three latexes — a styrene acrylate, acrylate coupling agent, and polyvinylidene chloride used for study. results show that occurs between Ca2+, SO42−, OH− released during hydration. Ca2+ ions acrylic is believed to be initiated alkaline hydrolysis carboxylate groups these polymers. This reaction, termed ‘saponification’ makes it possible carbonyl radicals ‘catch’ liquid phase whilst SO42− become ‘trapped’ in latter. With regard chloride-modified pastes, dehydrochlorination polymer. ‘catching’ involve certain species broken-down’ study also revealed dosages 5% or more (v/v composite) could release sufficient Cl− exceed tolerable corrosion limits reinforced concrete.