pyrite

Research Paper: Geomechanics of heave

Fred Shrimer (Golder Associates, Vancouver, Canada) has published a paper on the geomechanics of heave due to pyrite oxidation.

The paper, titled “Geomechanics of heave due the use of pyritic mudstone, Ireland” follows previous presentations and publications by Shrimer:

Shrimer, F.H., and Briggs, A. (2014). Pyritic heave in Ireland: A case study in selection. Paper presented at the 67th Canadian Geotechnical Conference (GeoRegina 2014). Saskatchewan, Canada, September 28th-October 1st 2014. Link to full paper PDF (permission granted by Fred Shrimer to upload PDF).

Shrimer, F.H., and Bromley, A.V. (2012). Pyritic heave in Ireland: The role of petrography.… Read the rest

USA: Burying 38,000 m3 of pyritic rock

PenDOtt Route 2001 project

State Route 2001, in Pike County, Pennsylvania, is undergoing considerable improvements. Back in March 2014, the Pocono Record (08.03.14) reported that a major phase of the improvement in Lehman Township was delayed due to the identification of pyritic rock along the route alignment. Quoting from the article:

“Bore samples taken two years ago for this project did not initially reveal a pyrite problem, but recent borings did show it in various places along the entire project area, which runs from where the last phase ended at Little Egypt Road to Oakridge Road.”

In July 2014, PyriteProblem.com reported on how engineers from the Pennsylvania Department of Transportation (PennDOT) were attempting to determine how much pyrite was present and how to mitigate the problem.… Read the rest

Dr A Brian Hawkins: Pyrite research compilation

Dr A Brian Hawkins

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

Pyrite Resolution Board Statistics: Third Update

Pyrite Resolution Board Statistics

The Pyrite Resolution Board (PRB) has produced eight reports since the Pyrite Remediation Scheme was introduced in February 2014. Further statistics are provided on the PRB website and in recent news articles. See statistics below and follow links for original data.

Statistics reporting in the eighth quarterly report of the PRB:

26th February 2014 to 4th January 2016:

  • 995 completed applications
  • 37 developments containing multiple applications
  • 63 single site applications
  • 809 Validated applications
  • 744 applications included in scheme
  • 163 dwellings completed remediation
  • Works contractors in place for 184 dwellings
  • Tendering underway for 104 dwellings
  • Remedial Works Plans under preparation for 246 dwellings
  • 17 applications refused
  • No outstanding appeals
  • PRB received a total of €484,000 from liable parties in 2015

 

Statistics reporting in the seventh quarterly report of the PRB:

Report not available on the PRB website.… Read the rest

European Court gives opinion in James Elliott case

European court of justice opinion delivered

The Advocate General of the European Court of Justice, Campos Sanchez-Bordona has delivered an opinion on Case C-613/14 (James Elliott Construction Ltd v Irish Asphalt Ltd). The Opinion was given in response to the request for a preliminary ruling from the Supreme Court of Ireland. The Opinion was delivered on 28/01/2016. The full text of the Opinion and the conclusions can be read by clicking here.

Interpretation and implications

An excellent summary of the James Elliott Construction Ltd v Irish Asphalt Ltd case can be found here on the EU Law Radar website.… Read the rest

Research Paper: Evaluating pyrite-induced swelling

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

Research Paper: Gypsum crystals in Irish mudstone aggregate

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:

Matheson, G. (2012). Pyrite-induced swelling. Annual Guest Lecture given to the Geotechnical Society of Ireland. 6.12.12, Engineers Ireland, Dublin. Click here to see original flyer.Read the rest

Research Paper: Use of a granular interface in construction over pyritic ground

Use of a granular interface over pyritic ground

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

Research Paper: Identification of pyrite induced heave

Pyrite Induced Heave

Taylor, Cripps and Clarke (University of Sheffield) have published a paper on the identification of pyrite induced heave using chemical and structural assessments. The authors consider the use of chemical and structural assessments to determine whether pyritic heave caused structural damage in a number of case studies.

The paper, titled “The identification of pyrite induced foundation heave by chemical and structural assessments” follows prior research on the in-situ investigation of pyritic fill by the authors:

Taylor, A.J., Cripps, J.C., and Clarke, S.D. (2015). The effect of temperature and moisture content on the behaviour of pyritic fill: development of an in situ monitoring system.… Read the rest

Research Paper: Investigation of pyrite heave in Dublin, Ireland

Pyrite Heave in Dublin

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.

The paper, titled “Investigation of destructive ground heave affecting new-build properties constructed using pyrite bearing fill in the Dublin area of Ireland” follows prior research on the Irish pyrite problems (click here to view literature on the Irish pyrite issues).

Abstract

“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.
Read the rest