Mr David Richardson is a construction materials specialist, dealing specifically with issues relating to natural building stone. He is the Chairman of the Stone Federation Great Britain Technical Committee and has spent nearly 20 years working at the Building Research Establishment.
Mr Richardson deals with issues relating to new build, refurbishment and historic structures from specification and design through to workmanship and materials failure. He has experience working all over the UK, Europe and the Middle East on commercial and residential buildings/projects.
Services offered include;
Selection and assessment of natural stone for commercial and residential projects; including cladding, lining, paving, flooring, vanity tops, kitchen work tops
Testing of natural stone
Guidance on the ethical and responsible sourcing of natural stone
Slip resistance guidance, assessment and testing of floors,
Forensic investigations of natural stone failures
Petrographic examination of building materials including natural stone and concrete
Forensic investigations of concrete failures
Experts in Petrographic Examination of Materials
The examination of materials in thin section can provide a lot of valuable information about the performance of a material, either prior to use or in an investigation when a problem has been encountered. Examination of materials pro-actively has many advantages as it will prevent subsequent failures in service.
In forensic investigations the detailed insight that a thin section examination can provide is often conclusive in confirming the true cause of a problem and what the possible solutions can be.
Classification of stone to present its true geological type. Relevant to CE Marking.
Identification of potentially deleterious mineral inclusions or features e.g. stylolites.
Contributes to assessment of likely in-service durability.
Supports investigations into performance issues.
Confirmation of aggregate type
Distribution and size of aggregate.
Identification of cement type and cement replacements ; e.g. OPC, HAC, GGBS, PFA.
Confirmation of presence and depth of carbonation.
Size and distribution of entrapped air.
Identification of air entrainment.
Indication of water/cement ratio.
Evidence of deleterious reactions e.g. alkali silica reaction (ASR), sulfate attack, delayed ettringite formation (DEF)