Nature of Work: Soil Stabilisation
Client: Tycroes Group
Project Location: Machynys Road, Llanelli
Summary
Tycroes Group were contracted by Gwalia Housing to construct a series of new houses and apartments at Machynys Road, Llanelli in mid 2014 including roads, drainage, foundations and building works. As part of Ty Croes scope of works they needed to carry out a filling exercise to raise the levels across the site which were between 500mm and 1000mm lower than the required formation level.
Within the existing site boundary there was a stockpile of material previously excavated from other developments adjacent to the site. This material was a mix of made ground and cohesive fill and in its existing format was deemed unsuitable for use due to excessive moisture. Darlow Lloyd & Sons carried out lab testing and determined that the material was suitable for soil stabilisation and use within the finished works as stabilised fill material.
Darlow Lloyd & Sons mobilised a dust free soil stabilisation machine to site and carried out the in-situ stabilisation of the stockpiled material using a pre determined mix design comprising of an ultra low carbon stabilisation binder produced by Cenin Cement Ltd. The material was treated in layers then compacted and tested by Darlow Lloyd & Sons to prove the required CBRs were met including 5% CBR in the bulk fill and 15% CBR capping replacement under the roads.
Benefits
Using soil stabilisation on this project enabled Tycroes to use material previously deemed unsuitable for use, meaning that the material did not need to be disposed from site. There was also a reduction in the amount of aggregate imported to site. The stabilisation was carried out using a dust free stabilisation machine due to the close proximity of adjacent houses.