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Abstract

Preplaced Aggregate Concrete (PAC) consists of graded coarse aggregate, placed and packed into position, and then immobilized by cementitious grout injected into the voids between the aggregate pieces. PAC can be considered as a suitable backfill material for mined radioactive waste repositories because of: ready re-use of the mined material, large volume concreting and mechanical - remote placement potential, reduced shrinkage and heat cycle during cement hydration, high density and good plant economics. Considerable experimental difficulties were encountered. The necessary grout fluidity was only achieved by using bentonite. The test data collected indicate that the PAC system employed did not improve the short and longer term mechanical properties. This is directly attributed to the non-usage of organic admixtures which constrained the grout mix design to be far from the optimum. As a consequence, general conclusions only are inferred from the experimental work. The report ends with recommendations for further research on low permeability concretes using organic admixtures.

Additional information

Authors: CASSON R B J, TAYLOR-WOODROW CONSTRUCTION LTD., SOUTHALL, MIDDLESEX (UK);DAVIES I L TAYLOR-WOODROW CONSTRUCTION LTD., SOUTHALL, MIDDLESEX (UK), TAYLOR-WOODROW CONSTRUCTION LTD., SOUTHALL, MIDDLESEX (UK)
Bibliographic Reference: EUR 10383 EN (1986), VOLUME 1, 89 P., BFR 150, BLOW-UP COPY BFR 450, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124132900 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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