Design and Preparation of Self-Compacting Concrete for Pre-stressed Mass Concrete Structures

Author(s): Zhu Wen, Chen Yang, Zhang Tongsheng, Hu Jie Wei Jiangxiong, Yu Qijun
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 100-116
Total Pages: 17
Language: English

Abstract: Requirements of self-compacting concrete(SCC) applied in pre-stressed mass concrete structures include high fluidity, high elastic modulus, low adiabatic temperature rise and drying shrinkage, which cannot be satisfied with ordinary SCC. In this study, in order to solve the problems, a few principles of SCC design was proposed and the effect of binder amount, fly ash(FA) substitution, aggregate content and gradation on the workability, temperature rise, drying shrinkage and elastic modulus of SCC were investigated. The results and analysis indicate that the key effect influencing the fluidity was paste content, and the main factors improving the elastic modulus of SCC were a lower sand ratio and an optimized coarse aggregate gradation. Lower adiabatic temperature rise and drying shrinkage were beneficial for decreasing the cement content. Further, based on the optimization of mixture, a C50 grade SCC (with binder amount of only 480 kg/m3, fly ash substitution of 40%, sand ratio of 51% and proper coarse aggregate gradation (V5-10mm: V10-16mm: V16-20mm=30%:30%:40%)) with superior workability was successfully prepared. The temperature rise and drying shrinkage of
the prepared SCC were significantly reduced, and the elastic modulus reached 37.6GPa at 28d.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00