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Protective Levels of Borates in timber Foundation Piles 5 – 18 Years after In-situ Remedial Treatment in Areas with Wet Clay Ground Conditions. The Jerbor and Eurobor Protocol, Part 1.
2011 - IRG/WP 11-30571
Timber has been used as foundation piles and grillages for decades or even centuries. Since the late 1970s a method for investigate, analyze and treat building timber foundations in soft clay grounds against decay fungus with a biocide have been developed and used by the late professor Allan Jerbo. Settling of buildings in soft clay grounds is continuously monitored and if damages to the building occur as a consequence of differential settling actions must be taken. Settling pattern, ground geotechnical properties and the condition of its timber foundation is evaluated. Settling damage is due to decay of foundation timber have been treated with biocides and special application techniques and results from 5 - 18 years after using these techniques, The Jerbor or Eurobor protocols, show that in-situ treatment with a water solution of borates have been successful. Samples of wood from piles were taken by digging or coring below the building foundations and determination of total boron in wood samples show concentrations in the decay front well above the 1 kg BAE /m3 wood limit for preventing wood degradation by fungi. One example of Jerbor® showed 1.74 kg BAE/m3 wood in average 18 years post treatment simultaneous as the foundation groundwater concentrations was 96 mg BAE/liter in average. To great damage of foundations cannot be repaired and consequently a new steel and concrete foundation have to be made. Costs are often in the 0.5 – 10 million € range for this work why a building benefit from choosing a preservative treatment when this is possible. Approximately 200 foundations have been treated with the Jerbor and Eurobor technique.
M Theorin, K-M Bandh
Effectiveness of Water Based Bentonite-Borate Slurry for In-situ Remedial Protection of Historic Wooden Piles: The Eurobor Protocol, Part 2
2011 - IRG/WP 11-30574
The study of the biocide product Eurobor®, water mixture of boric acid, borax and sodium bentonite, aimed to verify previous findings regarding borates penetration from a clay-water mixture of foundation timber. The product was applied on samples from 100 year old timber foundation from the city of Göteborg. Although in ground for this long the timber was in acceptable god condition due to ground water coverage of the foundation piles. The results show that borates diffuse readily into the sapwood and reach toxic concentrations (> 1 kg BAE/ m3 wood) for decay fungi in the decay front. Penetration of borates from the clay-mixture correlated with wood samples decay pattern and reached into sound heartwood. Concentrations reached 60000 mg BAE/kg in sapwood and 2500 mg BAE/kg inside the decay front towards heartwood. The technique with Eurobor® has been demonstrated both in field and laboratory to be effective by penetration and retention of the borates in toxic levels for decay fungi.
M. Theorin, K. Fimmerstad, K-M. Bandh