|Multiject Test - 000830
Test Date: August 30, 2000
Test Location: Underground Services (1983) LTD. - Bolton,
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
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
(Image from Ultra /
The reason for the test and the
result of using Multiject (Ultra) in the project, can be seen in this mail
from Multiurethanes Ltd.
second large job involved the installation of 480 LM of
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.
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.
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
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.
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."