Pumping influence on fresh properties of self-consolidating concrete
Pumped concrete has been widely used for repair and rehabilitation of many concrete structures. The flow ability, passing ability, and self densification of Self-Consolidating concrete are beneficial when repair is needed for tight and heavily-reinforced situations. The research investigation presented herein was intended to study the influence of pumping on the fresh properties of self-consolidating Concretes (SCC). The selected SCCs were made with a constant water-to-cementitious materials ratio of 0.40, a uniform cement content of 390.38 kg/m3 and a constant coarse-to-fine aggregate ratio of 1.083. Both polycarboxylate-based High Rank Water-Reducing Admixture (HRWRA) and Viscosity Modifying Admixture (VMA) were used to produce self-consolidating concretes with a slump flow of 635 ± 25 mm, VSI of 0, and T50, of 2 to 5 seconds. A pumping distances of 60 m was used to evaluate the flow ability, passing ability, stability, rheology (yield stress and plastic viscosity), air content and air void characteristics of the selected self-consolidating concretes. Test results revealed that the pumping adversely affected the fresh performance of the self-consolidating concrete by decreasing the unconfined workability, flow rate, and passing ability; and by increasing the dynamic segregation resistance. The impact of pumping on the rheological properties of self-consolidating concrete was manifested by a moderate increase in relative yield stress and a significant decrease in relative plastic viscosity. The air content remained unaffected by the pumping action, whereas the air voids characteristic was altered through size increases of the air bubbles.
Civil and Environmental Engineering | Construction Engineering and Management | Engineering | Environmental Sciences | Materials Science and Engineering | Structural Engineering
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Islam, M. S.
Pumping influence on fresh properties of self-consolidating concrete. In M. Grantham; V. Mechtcherine; U. Schneck,
Concrete Solutions: Proceedings of Concrete Solutions, 4th International Conference on Concrete Repair
Taylor & Francis.