The effectiveness of supplementary cementing materials in suppressing expansion due to ASR: Another look at the reaction mechanisms part 2: Pore solution chemistry

摘要: Abstract Pore solution chemistry (high pressure extraction method) of cement pastes made with two condensed silica fumes, three pulverized fly ashes and one ground granulated blast furnace slag was measured after 7, 28, 84, 182, 364 545 days curing (38°C 100% R.H.). Results were compared to expansions obtained for a 2 year time period in the CAN/CSA A23.2-14A Concrete Prism Method concrete specimens very alkali-silica reactive aggregates tested at same conditions water/cement/SCM. A long-term threshold alkali hydroxide concentration observed around 0.65N, below which no significant expansion occurred corresponding concretes. The lower SCM content as well, higher content, easier this limit is satisfied.