Summary of Multiject test

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(Note! Ultra is called Multiject for the North American Market)

Multiject Test - 000830

Test Date:  August 30, 2000
Test Location: Underground Services (1983) LTD. - Bolton, Ontario.

Test Goals:  To determine if Multiurethanes Multiject injection hose system is suitable for use with Spinor A12 Microfine cement as stated in the manufacturers literature.

Mixing Equipment: 1L4 Portable high speed mixer  complete with Moyno Pump.

Injection Material: Spinor A12 microfine cement was mixed for 5 minutes using a 2:1 water to cement ratio.

Injection Hose: A 15 foot length of Multiject injection hose was equipped with 1 meter lengths of 1/4" extension tubing at each end.

Results: At a pressure of 25 PSI, select Multiject valves opened and microfine exited. At a pressure of 50 PSI, all of the Multiject valves were open and microfine was dispensed evenly along the full length of the injection hose.

Conclusion: The tests provided live confirmation of the manufacturers statements that Multiject is a suitable injection hose system to deliver Spinor A12 microfine cement. Also, given the valve opening pressure requirement determined by the tests to be > 25 PSI, Multiject's valve construction outperforms other competitive re- injectable hose systems presently available, in it's ability to be thoroughly flushed at pressures of < 25 PSI after injection.

(Image from Ultra / Multiject test)

 

The reason for the test and the result of using Multiject (Ultra) in the project, can be seen in this mail from Multiurethanes Ltd.

"The second large job involved the installation of 480 LM of

Multiject during a concrete rehab and anchoring project at the Pointe Du Bois Hydro Electric dam located a couple hours North of Winnipeg in the Province of Manitoba. KGS Group were the Engineers on this project. The owner of the dam is Manitoba Hydro.

The owner wanted to install a series of rock anchors to further secure the dam to the bedrock. This involved filling a series of void chambers that existed in the dam below the powerhouse slab. The engineer realized that the gap between the fill concrete and the underside of the powerhouse slab resulting shrinkage would cause a great deal of difficulty in post tensioning the anchors. Grouting of the shrinkage void using conventional drill and pump methods from the top side of the slab was ruled out due to the location of generators, turbines, etc.

The answer was the installation of Multiject to the roof or underside of the powerhouse slab prior to the placement of the fill concrete. In cooperation with the Contractor, Underground

Services, and the Engineer, we performed some tests to the Multiject hose prior to the actual installation to confirm its suitability with Microfine Cement. The results of the test accompany this note.

After the fill concrete had cured for 14 days, Spinor A12 Microfine Cement was injected through the Multiject Hose system, completely filling the shrinkage void between the fill concrete and the underside of the slab. The anchors were then successfully installed. The job was completed on time and budget. The owner and engineer will be using Multiject for future dam rehabilitation projects."

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