Bedding and Backfill for Small Excavations

Price: £11  

The HAUC Specification for reinstatement recognises the need for good compaction of backfill. However, standard GSB Type 1 contains large particules up to 37.5mm in size which prevent effective compaction in small openings. The aims of this project were to: investigate the performance of granular materials which could be used as both bedding and backfill in small excavations; develop a purchasing specification for these materials; and consider methods for testing the material on site to ensure that it meets the material description. A suitable material was identified which required less compaction than GSB Type 1, and a prototype specification is given. The study of test methods concluded that there are no simple on- site tests to confirm that a granular material complies with its specification, other than a visual assessment. The Dynamic Cone Penetrometer appears to offer a reliable way of assessing the compaction of granular material as it is being installed.



UKWIR Reference :- 96/WM/01/15Published Date :- 17/04/2002
Retail Price (£) :- 11ISBN :- 1 84057 079 2