Development of rapid setting self-consolidating concrete (RSSCC) using small size aggregate

Title: Development of rapid setting self-consolidating concrete (RSSCC) using small size aggregate
Author(s): Yogini Deshpande, Jan Olek
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 19
Language: English

Abstract: Frequently, the repairs of concrete structures need to be performed in confined spaces where repair materials are placed around the existing or newly installed reinforcement. As a result, it is very desirable for the repair material to have high fluidity to facilitate complete filling of the repair area, preferably without the use of a vibrator.
This paper presents the results of development of rapid-setting, self-consolidating concrete (RSSCC) for repair applications. The RSSCC was developed using 9 mm maximum size aggregate, Type III portland cement, silica fume, micro-fine fly ash, polycarboxylate-based superplasticizer and non-chloride accelerators. The mixing process was carried out in small capacity (about 28 litres) mortar mixer, similar to those typically used on small repair jobs. The target properties of the RSSCC were slump flow of 660 mm and 6 h compressive strength of 17 MPa.
The fresh concrete properties measured were the slump flow, T50 flow time, Visual Stability Index (VSI), V-funnel flow time, L-box passing ratio and the air content. The hardened concrete properties studied were the rate of strength development, slant shear bond strength, and durability (using rapid chloride permeability and freeze-thaw resistance tests).
The results of the study indicate that it is possible to develop a small aggregate size based self-consolidating repair concrete that achieves a compressive strength of 19 MPa at the end of 6 hrs, has good bond characteristics and excellent freezing and thawing durability (DF>90%).

Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.057