EFFECT OF A HIGH MOLECULAR WEIGHT BIOLOGICAL POLYMER ADMIXTURE ON THE RHEOLOGY OF SELF-CONSOLIDATING CONCRETE

Author(s): Jiaping Liu, Wen Xu, Qianqian Zhang and Hua Li
Paper category: Proceeding
Book title: Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi, Zhihua Ou and Kamal Henri Khayat
Print-ISBN: 978-2-35158-143-8
e-ISBN: 978-2-35158-144-5
Publisher: RILEM Publications SARL
Publication year: 2014
Pages: 13 - 23
Total Pages : 11
Language : English

Abstract: Self-consolidating concrete (SCC) is a complex system that can be made by using a wide range of mixture proportioning and often incorporated various chemical admixtures and supplementary cementitious materials in order to obtain high flowability, robustness and cohesiveness in cast-in-place and precast applications. In this study, the yield value, plastic viscosity, pseudoplasticity and thixotropy were rather used to experimentally assess the effect of various chemical viscosity modifying admixtures (VMA) especially a high molecular weight biological polymer (HBP) on the rheological properties of cement pastes. On this basis, the slump flow (SF), T500 time, V-funnel time, segregation index (SI), bleeding rate and air content were measured to evaluate the workability of fresh SCC. The experimental results indicate that appropriate and gentle increase of plastic viscosity, shear thinning behavior and proper thixotropy caused by the application of VMAs are beneficial to prepare SCC. Among these VMAs, the naturally-derived HBP, which has been widely used in priority projects, shows the best performance. This may be partly due to its special molecular structure that brings the adsorption, hydration and intertexture effects on hydrone or solid particles in the fluid.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00