Pumping of Lightweight Concrete Using Non-Presoaked Lightweigh tAggregate

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Title: Pumping of Lightweight Concrete Using Non-Presoaked Lightweigh tAggregate

Author(s): T. Yonezawa, Y. Yoshioka, T. Iwashimizu, K. Nanjo, S. Yoneda, K. Sakaue, and T. Nakase

Publication: Special Publication

Volume: 109

Issue:

Appears on pages(s): 625-654

Keywords: absorption; air entraining agents; freeze-thaw durability; lightweight aggregate concretes; lightweight aggregates; pumped concrete; strength; water; water-reducing agents; Materials Research

Date: 8/1/1988

Abstract:
Focus is the study of basic properties of the low water-absorption lightweight aggregate and the water-absorption reducing agent that were developed to make the pumping of lightweight concrete using non-presoaked lightweight aggregate possible. The water absorption of the low water-absorption aggregate was extremely small. The compressive strength and modulus of elasticity of the concrete were found to be considerably higher than those of the concrete using ordinary calcined expanded shale aggregate. The water-absorption reducing agent reduced water absorption under pressure considerably. The compressive strength and modulus of elasticity of the concrete using the aggregate that was treated with the agent were not significantly influenced by the agent. The concrete using the dry low water-absorption aggregate without presoaking that was treated with the agent was pumped through a pipeline with an equivalent horizontal length of 160 m. However, as the aggregate absorbed water, it showed a drop in slump, an increase in compressive strength, and a particular internal pressure distribution along the pipeline.