Mourice Czerewko (AECOM), Ian Longworth (BRE), Murray Reid (TRL) and John Cripps (University of Sheffield) have published a paper on the terminology and test methods for sulphur minerals.
The paper, titled “Standardized terminology and test methods for sulphur mineral phases for the assessment of construction materials and aggressive ground” follows recent publications on sulphur-species by the authors:
Czerewko, M.A., and Cross, S.A. (2015). Benefits of a granular construction interface in highway construction over pyritic subgrades for mitigating against deleterious ground effects. Proceedings of the XVI ECSMGE Geotechnical Engineering for Infrastructure and Development.… Read the rest
Dr Brian Hawkins, a former Reader in Engineering Geology at the University of Bristol and independent consultant engineering geologist, passed away in January 2016. A remembrance article for Dr Hawkins can be found at the University of Bristol news pages (here).
Research into the engineering implications of pyrite oxidation and sulfur-species
Since at least the 1980s, Dr Hawkins was involved with the examination of, and research into, cases of pyrite heave. He published two books and over 20 papers on the topic of pyrite oxidation and sulfur-species in geological materials.… Read the rest
George Matheson (Matrock Consulting) and Paul Quigley (Irish Geotechnical Services Ltd) have published a paper on the petrological examination and assessment of aggregates that have undergone pyrite-induced swelling.
The paper, titled “Evaluating pyrite-induced swelling in Dublin mudrocks” follows previous presentations and publications by the Matheson:
Matheson, G.D, and Jones, G.L.I. (2015). The habit and form of gypsum crystals in Irish mudstone aggregate affected by pyrite-induced swelling. Quarterly Journal of Engineering Geology and Hydrogeology. 48, 167-174. Click here to read a summary of the paper.
Matheson, G. (2012). Pyrite-induced swelling. Annual Guest Lecture given to the Geotechnical Society of Ireland.… Read the rest
George Matheson (Matrock Consulting) and Gareth Jones (Conodate Geology) have published a paper on the mineralogy of gypsum in aggregates that have undergone pyrite heave. The authors used advanced petrography to examine the form of gypsum and its relation to forceful or passive growth with regards to aggregate expansion.
The paper, titled “The habit and form of gypsum crystals in Irish mudstone aggregate affected by pyrite-induced swelling” follows previous presentations by Matheson, e.g., in December 2012:
Tom St John (University of Bristol) has published a paper on the use and limitations of derived chemical terms for assessing sulfur-species in ground materials. The author considers a wide range of derived chemical terms used in the literature, such as equivalent pyrite and total potential sulfate and the limitations involved in their application.
The paper is titled “Use of derived terms for sulfur-species in geological materials”.
“An assessment of the sulfur/sulfide content of ground materials for civil engineering purposes is essential in order to understand the potential for sulfate development. In the absence of detailed petrographic/mineralogical data, terms such as “total potential sulfate”, “oxidisable sulfides” and “equivalent pyrite” are often derived from sample test results for total sulfur, water-soluble sulfate and acid-soluble sulfate.
Brian Hawkins (HM Geotechnics) and Tom St John (University of Bristol) have published a paper on the presence of sulfur-species in glacial tills (boulder clays) and the implications for engineering and construction. The authors consider a case study of road construction (A10) in an area underlain by glacial till in Hertfordshire, UK.
The paper, titled “Engineering significance of sulfur/sulfate in glacial tills” follows prior discussion of the A10 case study by Hawkins (2013):
Hawkins, A.B. (2013). Some engineering geological effects of drought: examples from the UK. Bulletin of Engineering Geology and the Environment.… Read the rest
Czerewko and Cross (AECOM) have published a paper on the use of a granular construction interface to separate road pavements from underlying pyritic subgrade. The authors consider case studies and the implications for road construction where such an interface has and has not been used.
The paper, titled “Benefits of a granular construction interface in highway construction over pyritic subgrades for mitigating against deleterious ground effects” follows a prior case history publication by M. Czerewko on the construction of the A46, whereby pyritic subgrade extended over much of the road scheme:
Czerewko, M.A., Cross, S.A., Dimelow, P.G., and Saadvandi, A.… Read the rest
Mourice Czerewko (AECOM) and John Cripps (University of Sheffield) have published a paper on the investigation of pyrite heave affecting properties in Dublin, Ireland. The authors report on a case study from north Dublin, where pyrite bearing fill had been used below the new-build property floor slabs.
“Although structural damage caused by the expansion of bedrock and fills due to the presence of pyrite has been documented internationally since the 1960s, there is an apparent lack of awareness of the potential for these problems in the construction industry, particularly the domestic housing sector.
Bo Westerberg (Swedish Geotechnical Institute), Rasmus Muller and Stefan Larsson (KTH Royal Institute of Technology, Stockholm) have published a paper on the determination of undrained shear strength of coastal sulfide soils in the Gulf of Bothnia.
The paper, titled “Evaluation of undrained shear strength of Swedish fine-grained sulphide soils” adds to previous research by the authors on the sulfide-bearing soils of Sweden and Finland. The full abstract from Engineering Geology is shown below. Click here to read the abstract on the Science Direct website and access the paper.
“In Swedish practice, there is a long tradition of evaluating undrained shear strength from fall-cone tests and field vane tests.
David Rickard (Emeritus Professor at Cardiff University, Wales, UK) has written a book titled Pyrite: A Natural History of Fool’s Gold. The book was officially published today (25th June 2015) by Oxford University Press USA.
Synopsis from amazon
“Most people have heard of pyrite, the brassy yellow mineral commonly known as fool’s gold. But despite being the most common sulfide on the earth’s surface, pyrite’s bright crystals have attracted a noteworthy amount of attention from many different cultures, and its nearly identical visual appearance to gold has led to tales of fraud, trickery, and claims of alchemy.