Synthesis of a new polycarboxylate at room temperature and it's influence on the properties of cement pastes with different supplementary cementitious materials

Author(s): Shuncheng Xiang and Caijun Shi
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
ISBN:978-2-35158-204-6
e-ISBN:978-2-35158-205-3
Publisher: RILEM Publications SARL
Publication year:2018
Pages:196-213
Total Pages:18
Language : English

Abstract: Three polycarboxylates with different comb structures (i.e., the same degree of polymerization in side chains but different main chains) were synthesized via radical polymerization reaction at room temperature. The effect of polycarboxylates on the surface tension and the Flowability in cement pastes was determined. The best product was selected
to study its effects on the hydration heat evolution, compressive strength, autogenous shrinkage and drying shrinkage of cement pastes with different kinds and contents of supplementary cementitious materials. The results showed that: with increasing of molar ratio between AA and TPEG to 6: 1, we could synthesis the best product. when the water-cement ratio was 0.4, with increasing of polycarboxylates, the cement hydration heat evolution had been slown down, and the more the dosage was, the more obvious the effect was. Adding supplementary cementitious materials to cement under the same experimental conditions also played a mitigation role in slowing down the hydration heat. When the water-cement ratio was 0.3, supplementary cementitious materials could increase strength of cement by 24.5% in maximum, its autogenous shrinkage and drying shrinkage could be decreased respectively by
60.1% and21.9% in lowest.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00