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Pumping of Lightweight Concrete Using Non-Presoaked Lightweight Aggregate

• ID:

  1646

• ESCSI:

  4770.054

• Author:

  Yonezawa, Toshio; Hoshioka, Yasuhiko; Iwashimizu, T.; Nanjo, K.; Yoneda, S.; Sakaue, K.; Nakase, T.

• Publication Name:

  Takenaka Tech. Res. Rep.

• Type of Publication:

  Journal

• Publisher:

  Takenaka Technical Research Laboratory, Japan

• Dated:

  1988

• Issue/Volume:

  May, No. 39

• Other ID:

• Page(s):

  119-132

• Reference List:

  Y

• Abstract:

  The water absorption of the low water-absorption aggregate was extremely small, i.e. about 1/10 of the calcined expanded shale aggregate under the sprinkling condition and about 1/3 under the pressurized condition of 3.5 MPa. The compressive strength and modulus of elasticity of the concrete using this aggregate 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 pre-soaking that was treated with the water-absorption reducing agent was able to be pumped through a pipeline with an equivalent horizontal length of 160 m. However, as the aggregate absorbs water to some degree it showed a drop in slump, an increase in compressive strength and a particular internal pressure distribution along the pipeline.