heave

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

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: Sulfur-species in glacial tills

sulfur-species in glacial tills

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

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

Ireland: Second Update on Pyrite Resolution Board Statistics

Pyrite Resolution Board STATISTICS

The Pyrite Resolution Board (PRB) has produced six 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.

Pyrite Resolution Board Statistics reported in the sixth quarterly report of the PRB:

26th February 2014 to 3th June 2015:

  • 763 completed applications
  • 33 developments containing multiple applications
  • 49 single site applications
  • 637 Validated applications
  • 520 applications included in scheme
  • Pilot project of 5 dwellings remediated (September to November 2014)
  • 16 dwellings completed remediation in 2015
  • Works contractors in place for 132 dwellings
  • Tendering underway for 65 dwellings
  • Remedial Works Plans under preparation for 163 dwellings
  • Anticipated 236 dwellings to be remediated in 2015
  • 11 dwellings refused from scheme (five have appealed)
  • In 5 cases, agreement has reached with builders/developers regarding contribution towards cost of remediation of 67 dwellings

Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 7th June 2015:

  • Total 763 applications (significant pyritic damage)
  • 115 applications in Validation Stage
  • 117 applications at Verification Stage
  • 520 applications included in the scheme
  • 8 applications refused

Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 1st May 2015:

  • Total 712 applications (significant pyritic damage)
  • 107 applications in Validation Stage
  • 97 applications at Verification Stage
  • 508 applications included in the scheme
  • 7 applications refused

Pyrite Resolution Board Statistics reported in the fifth quarterly report of the PRB:

26th February 2014 to 31st March 2015:

  • 697 completed applications
  • 33 developments containing multiple applications
  • 49 single site applications
  • 583 Validated applications
  • 496 applications included in scheme
  • Pilot project of 5 dwellings remediated (September to November 2014)
  • Remediation of 20 dwellings commenced in February 2015
  • Contractors appointed to 72 dwellings in March 2015
  • Testing underway for 63 dwellings
  • Remedial Works Plans under preparation for 179 dwellings
  • 11 dwellings refused from scheme (three have appealed)

Pyrite Resolution Board Statistics reported in the fourth quarterly report of the PRB:

26th February 2014 to 1st January 2015:

  • 622 completed applications
  • 27 developments containing multiple applications
  • 47 single site applications
  • 483 Validated applications
  • 321 applications included in scheme
  • Average 3 applications per week since 3rd quarterly report
  • 2 appeals in process
  • Pilot project of 5 dwellings remediated (September to November 2014)

The Irish Independent reported an update on the Pyrite Remediation Scheme statistics for the end of January 2015:

  • Total 632 applications
  • 485 applications Validated
  • 328 applications included in scheme
  • Work at tender stage for 73 dwellings
  • Work completed on 5 dwellings

Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 31st October 2014:

  • Total 590 applications
  • 151 applications in Validation Stage
  • 231 applications at Verification Stage
  • 208 applications included in the scheme

Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 7th October 2014:

  • Total 575 completed applications and 36 commenced applications
  • 144 applications in Validation Stage
  • 220 applications in Verification Stage
  • 2 Verified applications awaiting decision
  • 206 applications included in the scheme
  • Remediation contracts in place for 5 dwellings
  • 3 applications not considered

Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 4th July 2014:

  • Total 521 completed applications and 35 commenced applications
  • 312 applications in Validation Stage
  • 127 applications in Verification Stage
  • 27 Verified applications awaiting decision
  • 52 applications included in the scheme
  • 3 applications not considered
Pyrite Resolution Board Statistics reported by the Pyrite Resolution Board for 15th April 2014:
  • 418 completed applications and 146 commenced applications
  • 84 applications Validated and referred to Verification Stage
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HomeBond’s Repudiation of Purchasers’ Claims

Homebond’s repudiation of purchasers’ claims – was it lawful?

Joseph Tyrrell (FCII, FCILA, FUEDI-ELAE), an insurance claims expert from Dublin, has published an extensive report on HomeBond’s repudiation of purchasers’ claims under the Major Defects Warranty in the HomeBond Agreement for Damage by Pyritic Heave.

report executive summary

In the report summary, Joseph Tyrrell writes:

“Following a wide-ranging investigation, I am satisfied that HomeBond’s rejection of hundreds of its warranty-holders’ claims was invalid, for reasons which I have examined in detail in the main body of this report…”

“It is astonishing, to my mind, that no one in authority appears to have looked closely at the reasons given for wrongfully turning down so many Purchasers’ claims, but it seems that this is what happened and that HomeBond has thus far got away with its shameful behaviour.

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BS 5930:2015: new guidance on sulfur-species

BS 5930:2015

On 31 July 2015, BS 5930:2015 “Code of practice for ground investigations” was published, replacing the former standard, BS 5930:1999+A2:2010 (Code of practice for site investigations). The BSI website states that:

“BS 5930:2015 deals with the investigation of sites in order to assess their suitability for construction and to identify the characteristics of a site that affect the design and construction of the project.  It also considers related issues including the environment and the security of adjacent land and property.”

“This is a full revision of the standard and introduces some principal changes…” [including] “…Compliance with BS EN 1997-1 and BS EN 1997-2 and related test standards…” [and] “…New information on geophysical surveying and ground testing and updated guidance on desk studies, field reconnaissance, ground investigations on contaminated ground and ground affected by voids.”

Guidance on sulfur-species

BS 5930:2015 provides considerable additional guidance on the presence and assessment of sulfur-species in geological materials compared to the 1999 version.… Read the rest