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visible. In order to confirm this positive visual impression, the following measurements were made:
- DIN EN 12504 – Testing concrete in structures – Non-destructive testing – Determination of rebound number (12/2012)
Sand blasted bricks
- Products and systems for the protection and repair of concrete structures - Test methods - Measurement of bond strength by pull-off; German version EN 1542:1999
The MPA NRW was commissioned with evaluating the shaft rehabilitation by the M-Coating process, in respect of two wastewater shafts: in one case made of reinforced concrete, in the other of clinker brick. All operational requirements relating to preparation, assessment and coating of the shaft as per the DWA technical sheet and the QA manual were met in full. Thanks to the system’s mainly automated procedures, each shaft could be rehabilitated by a team of 2 operatives within approx 3 hours. The values for tensile bond strength in the shaft and the values established for flexural and compressive strength for ERGELIT-KS1 met the specifications laid down by Hermes & Co.
As a result of the use of the M-Coating process, wastewater shafts were restored to their as new, fully functional condition.”
Five years later (2015) the shafts were again examined by the MPA. Shortly before the end of the agreed period of warranty, all those involved met at the original site. First impressions were highly satisfactory. No corrosion cracks or leak were
- DIN EN 14630 – Products and systems for the protection and repair of concrete structures – Test methods – Determination of carbonation depth in hardened concrete by the phenolphthalein method (01/2007)
- DIN EN 1936 - Determination of real density and apparent density, and of total and open porosity (02/2007)
All tests confirmed the outstanding quality of the rehabilitation by the M-Coating process.
The compressive strength of the coating registered an average of 46 N/mm2 although the rebound hammer did not give absolutely identical results to those provided by the test sample prisms. Bond strength readings at approx 2.5 N/mm2 and 2.19 N/mm2 was well above those taken 5 years earlier: no reduction in strength could be detected. Carbonation depth was 0 mm. Open porosity was around 9.69%, and to a very shallow depth.
To sum up
The combination of ERGELIT KS-1 and the M-Coating process is a reliable and durable method of rehabilitation. In the present example it proved outstandingly successful. This has been attested by the MPA NRW and by the City of Dortmund – and elsewhere. The detailed reports can be obtained from HERMES Technologie in Schwerte (Germany), on request. Once again, our experience of over 33 years has been positively confirmed. We thank all those who took part, in particular the City of Dortmund, for their support.
The finished brick and concrete (RIGHT) shafts
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September 2015 | drain TRADER 15
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