Report BR 18 Use of crushed rock aggregates in concrete

Publication Year

1978

Document Status

Archived

Abstract

Describes an investigation into the characteristics of concrete made with coarse and fine crushed rock aggregates. Samples were obtained from 24 quarries covering a wide variety of materials and geographical distribution throughout the United Kingdom. The main programme was concerned with the crushing strength and other mechanical properties of concrete and involved casting 550 concrete mixes; a further 52 mixes were cast to examine other characteristics of concrete associated with its durability. This report describes the test procedures carried out on the aggregates and on the concrete made with them and discusses the results obtained. Good-quality concrete could be made with all the aggregates used. The mechanical and durability properties of the concrete varied depending on the aggregate. The difference in the performance of the concrete could not be related to any single characteristic of the aggregate. This work indicated that materials that are often regarded as of inferior quality for use in concrete may in fact be quite suitable for that purpose. Increasing the dust content of the fines from 10% to 25% resulted in only a small decrease in the crushing strength of the concrete. Although concrete of a required crushing strength could be obtained with the aggregate used by adjustment of the mix proportions, other characteristics such as elastic modulus or drying shrinkage depended primarily on the aggregate and were less affected by changes in the mix proportions.

Document History

Whilst this publication can still be purchased some of the information in it has been superseded by more recent research and standards. The BRE Group does not accept any responsibility whatsoever for any loss or damage, including - without limitation - indirect or consequential loss or damage arising from use, or loss of use, of data or profits arising out of, or in connection with, the use of this document.

Author

Teychenné, D. C.

ISBN

9780851250502

Publisher Information