Formation of hydrates of calcium aluminates in cement pastes with different dosages of SBR powder

The formation of hydrates of calcium aluminates in cement pastes in the presence of different dosages of styrene–butadiene rubber (SBR) powder was evaluated. The content of AFt, AFm, C4AH13 and CAH10 in cement pastes was determined using XRD. The results showed that SBR powder facilitates the formation of AFt and enhances its stability. The enhanced formation of AFt results from a decrease in CH formation. AFm and C4AH13 appear after 7 and 28 days and both contents are decreased by SBR powder. Most C3A reacts with CH after the gypsum is exhausted. CAH10 is present in the cement pastes with SBR powder.