TD - Ensuring Quality in Construction. TD Construction Testing are an independent materials testing laboratory, UKAS accredited to BS EN ISO/IEC 17025:2017. We are based in St Helens, Merseyside and we carry out a range of testing for the civil engineering & construction industry, both in our laboratory and on sites across the UK. Soil & Aggregates, Concrete & Structures, Bituminous & Pavements, Diamond Drilling. Also available to follow on: Twitter: https://twitter.com/TDConstTesting Instagram: https://www.instagram.com/td_construction_testing/ Facebook: https://www.facebook.com/pages/TD-Construction-Testing-Ltd/256621024472983?ref=hl