Lock-Roc Injection Resin
Product profile summary
Stratathane ST-534 Lock-Rok Injection Resin is a low viscosity,
MDI-based injection resin for structural soil modification, rock
anchoring, groundwater control and soil stabilization applications.
ST-534 Lock-Rok is useful for a wide range of applications, including
soil nails, rock anchors, and the like, especially in applications
where high strength is required.
Lock-Rok reacts very quickly with ST-535 in a 1:1 ratio by volume
to form a dense, very hard solid. Stratathane ST-534 Lock-Rok
is mixed with ST-535 at the work site to form a single injection
material. A twin-stream pump is preferred but the material can
be bucket-mixed and batch-poured in small quantities for surface
gravity feed applications. The inert end product is essentially
unaffected by acids, gasses, and micro organisms usually found
in rock and soil. The product is water-tolerant, and clean dry
surfaces are not required for successful applications.
ST-534 Lock-Rok may be placed by hand pumps or multi-ratio pumps.
Stainless parts are recommended but not strictly required because
ST-534 is no more corrosive than water. Cleanup of solidified
material in the system, however, is often accomplished with strong
cleaning compounds, making stainless steel advisable.
very low viscosity of ST-534 makes it easy to inject. Once cured,
its impermeability makes it a strong and effective and high-strength
anchoring and water cut-off system. The permeability of fissured
rock or soil grouted with ST-534 depends on how well its voids
are filled with grout. Values in the 10-7 cm/sec range should
be obtained using ASTM Constant Head Permeability Test Method
set time for the Stratathane ST-534/ST-535 system is defined as
the period from first contact of ST-534 with ST-535 to the point
where the mix becomes too thick for gravity flow. Set time for
any formulation is influenced primarily by the mix temperature.
Custom formulations are available for set times ranging from about
15 seconds up to about 60 minutes. Set times may also vary a little
with the age of the resin. The viscosity of mixed ST-534 is lowest
for the first 85% of the set time and increases rapidly as the
mix nears set.
available for use in the ST-534 Lock-Rok system also affect set
time. Consult the appropriate tables in the Technical Data Sheet
of the additive to determine the set time curves for the particular
additive in question.
Kleen-Purge Flushing Agent is recommended for cleaning the liquid
components from pumps, hoses and tools, but solvents like MEK
may also be used. When using solvents during cleanup, extinguish
all ignition sources and observe proper precautions for handling
such materials. For cleanup of cured ST-534, soak the affected
parts in a 100% solution of ST-522 Grout Cleaner using a covered
polyethylene container. Grout spills on clothing are permanent,
so disposable coveralls are recommended.
reasonable care in handling and storing ST-534 and ST-535. The
materials are hygroscopic (water absorptive) and moderately sensitive
to high storage temperatures.
an 80EF ambient temperature, the standard Stratathane ST-534/ST-535
mix initially sets in about 15 minutes and becomes tack free in
about 30 minutes. When injected into rock or soil, however, the
set time is increased. Cooler temperatures slow down the set time
while warmer temperatures accelerate it. Custom formulations are
available (subject to minimum quantity requirements) with set
times approaching one hour.
contact of ST-534 liquid is essentially nonirritating to the eyes
and is not expected to produce any appreciable skin irritation.
If ST-534 comes in contact with skin, wash with soap and water.
ST-534 should not be ingested, but single dose toxicity is considered
to be moderate. Small amounts swallowed incidental to normal handling
operations are not likely to cause injury but may cause gastrointestinal
discomfort, nausea, vomiting, lethargy, or diarrhea. Avoid exposure
to vapors created from this product when it is burned. Ventilate
the work area as a matter of good practice, although hazardous
levels of toxic vapors are not generally given off of the bulk
product. Small amounts of MDI may be present and some users may
be sensitive to MDI.