Frequently Asked Questions
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Q. We want to use Rockite to cover up 1/2" embedded steel bars on a Institutional Beds, that were used to handcuff prisoners to their beds etc. They are no longer allowed to do this so they want the embeded steel bar to be cut out and covered with Rockite or concrete etc. My question is can we use it for this application. And the other thing is the area to cover is aprox: 12" long x 2" wide x 2" depth, and that is flat on a cell bed. So when it is covered it will cover the area where the embeded steel was before. After this is done they will use an small prisoner mattress aprox: 2.5 inches thick and set on top, so prisoners can sleep on it.
We want to know that Rockite is safe for this application.
A. Yes Rockite will do what you require.
What I suggest is that once you have cut out the steel bars remove all debris etc. Then dampen the recess that you have created. This will help the mixture key into the concrete and also slow down the amount of absorption of water from the mixture of Rockite.
Mix your Rockite into a paste like batter and simply pour into recess. The Rockite will self level with the top of the concrete base and should have an initial set within 15-20 minutes and be stronger that the concrete base after an hour.
Rockite has no VOC's and is very safe to use in this application.
Q. Will your anchoring concrete hold the anchors of a 1/2 ton freestanding jib. 1" X 24" L-shaped bolts, anchor load 1420 lbs
A. Please consider the following.
1, If your project is external you need to use Kwixset which is the water proof version of Rockite. If you use Rockite it must be sealed with paint etc to make it water proof
2, Rockite and Kwixset will be stronger than concrete within one hour. The question you need to answer here is what is the strength of your concrete base
3, Look at the lab test results on www.rockite.com and review these. You will note that the greater the diameter the greater the loading. Secondly if you increase the depth you will also increase your loading. I suggest that you speak to an engineer and look at your options
4, The concrete base will be your weakest point so make sure that it is up to the required strength.
Q How much
heat can Rockite withstand without degradation. I am not worried
A At temperature of 212 degrees it pulls the moisture out and turns to
powder. At the higher temperature on the MSDS it will decompose
Q I have a subcontractor
that used rockite to anchor railing in a set of concrete
steps. Apparently the rockite expanded
and broke off the edges of the concrete where the rail posts
were installed. I understand expansion is how rockite works.
How close to the edge of concrete should rockite be used? According to your website you are
only supposed to use Kwixset on the exterior and stay a minimum
of 4" from the edge of the concrete.
A The products Kwixset and
Rockite are what we call Hydraulic Anchor Cements. Not to
be confused with non shrink grouts
etc. Both these products will have an expansion factor when
setting. It is with this expansion that the products establish
hydraulic force on the item being anchored and the concrete
surrounding the item. So this is why your concrete cracked.
I have seen some projects where the balustrades have been
anchored as close as 2 inches to the face edge and the concrete
has not failed. What we do not know is what was the Mpa of
the concrete. Hence we suggest that there be a minimum of
4 inches. It is more of a case of being safe rather than
For all exterior applications I would strongly suggest that
you use Kwixset. This being the water proof version of Rockite.
Rockite can be used outside however it must be water proofed
Q We had a warehouse floor with hairline cracks on the floor and
wonder if your product would work in filling the cracks. Can we
sprinkler the power into the crack and water it with sponge? Please
A Yes you can use Rockite for the task that you have described.
What I suggest is the following as your way would not be the
best way by a country mile.
Make sure that all lose debris and dust is removed from the cracks
Then dampen the crack/floor
Mix your Rockite mixture in to a batter like paste
Pour mixture direct along the crack
With a float or spatula work the rockite into the crack. It will
Scrape away excess and if necessary wipe of with a damp sponge
It is that simple. The Rockite will have an initial set 15-20
minutes and is good for working on after 2 hours.
Q What is the comparative strength of Rockite to an epoxy when
used with 5/8 inch steel anchor bolts set through a 6 inch concrete
and 8 inches into the foundation?
A There are several factors that must be considered.
What is the MPA factor of the concrete floor for a start. This is
often the weakest link in the construction chain. I would hope that
it is 25 plus.
If we assume that the concrete strength is sound I would suggest
that you drill your holes as deep as 6 inches (150mm) You have not
stated what loading you require on the bolts once set in Rockite
but I will assume that you require a considerable amount.
If you look at the test results that are on the website you will
see that Rockite and Kwixset will both rapidly increase their strength
as we increase the diameter of the hole drilled. You will note that
we have able to snap under tension pulling Grade 500 re bar, You
will also see the mode of failure. In most scenarios we encounter
concrete failure. In one test we experienced hydraulic testing equipment
failure at 100 kN. This test result equates that the Rockite was
at 500mpa aprox.
Rockite works on Hydraulic force because it will on setting expand.
The epoxy product requires accurate mixing and when set that the
chemicals bind according to manufacturers spec's.
I have no doubt that the Rockite products will exceed your expectations
providing you follow the instructions set out on the packet/website.
I would suggest that the dia meter of your holes be at least one
inch in diameter. Possibly more depending on loads required. Please
review test results at www.rockite.com and consult your engineers.
Q I am trying to figure out
a way to anchor my gate track in asphalt. Will rockite work in
asphalt? Would it hold a bolt in asphalt?
A The answer is yes however you need to be aware that
the Rockite must be covered as it is not water proofed for exterior
applications. (Kwixset for external) The other point you need to
consider is that the asphalt will be your weakest link in your project
due to the low compressive strength of the asphalt.
are a manufacturer and installer of metal and glass railing systems.
We have used Rockite in the past with good results. Your product
for exterior use is referenced as KWIXSET, does this product set
up at the same speed as Rockite and can we use warm water on cold
days to speed the set up with either Kwixset or Rockite?
Are the mechanical properties the same for both? Will we see any difference
when using either one during the application of these products?
Also where can we purchase KWIXSET in Vancouver B. C. Canada?
A Kwixset does set up and work in an identical manor as
Rockite. Warm water will be suitable when mixing in cold conditions.
Initial set time will be about 15 20 minutes. There is a colour
variation between the two products. You will see that the Kwixset
darker than Rockite.
I suggest that you speak directly with the Canadian
If you have no success I then suggest that you contact the manufacturers
direct in the USA.
Rockite stick to a painted concrete Floor? we have some low spot
that need filling and they do have paint in them we
can not get it all out, we want to know if the Rockite will still
A The very short answer
The Rockite or Kwixset needs to key into the concrete. If there
is pait left on the concrete irt will act a s a barrier thus preventing
a strong key between the concrete and Rockite or Kwixset. You must
remove the paint.
you tell me how Rockite fares in exposure to fire (heats of 500-600
degrees). I am building a wood-fired clay oven and am considering
materials for lining the inside of the door to the fire chamber.
I have read that concrete can remain stable up to 1000 degrees.
Is the case similar for Rockite? Should I expect cracking on the
surface exposed to the heat? Thank you for your time.
A I suggest that you do
not use Rockite for the project that you have in mind. At temperature
of 212 degrees the heat will pull the moisture out and turns to
powder. At the higher temperature on the MSDS it will decompose.
Q Can you please send me info regarding your Rockite Expanding Cement. I have been told that it would be a good product to use to fill the space between a tempered glass railing and its surrounding track. I take it that the expansion means flexible, not that it expands when it sets. I am looking for something that is elastomeric.
A With respect to your
request Rockite or Kwixset are more than appropriate for the task
that you have described.
However our products when set have a compression strength greater than
concrete. Each product works on hydraulic force locking the glass firmly
into place. Our products are not flexible once set.
I put the product in a hole in a level floor, will it expand and
create a "dome" above the surrounding flat floor, requiring time-consuming
grinding to bring it to level with the surrounding floor?
A No griding should
be required at all. Rockite is self-levelling when mixed to a fluid
consistency. As a plasticine mix Rockite will self-level
just as concrete does with the aid of vibration. Overflow or spillage
can be troweld off level or wiped up with a wet cloth within 20-30mins
We are building a deck on a rock ledge. To do so we are anchoring
1/2" rebar into
holes drilled 6" into the rock, then pouring a
concrete footing above for a flat surface to put
our post-base on. I had been using epoxy to
secure the rebar in the hole, but its a pain to
work with and takes too long to cure. Someone
recommended Kwixset. Seems it'd do the trick. My
question is: how long after setting the rebar in
rock with Kwixset would I have to wait until I
could pour my footing over that Kwixset-set rebar?
A Both Rockite and Kwixset
have an initial set time of 15 -20 minutes. Therefore I would suggest
that if you were to wait for two hours before you pour your concrete
that would be more than ample. Rockite and kwixset can actually
be stressed after two hours when loading on anchors is required.
I note that you did not metioin the diameter of your drilling.
I would also suggest depending on loading required that your drilling
should be no less than 3/4" or 20 mm. Both Rockite and Kwixset
work on hydraulic expansion. Caution: Some rock structures/formations
are very soft. Ensure that your engineer has signed off before
proceeding with the project. Note strength test results from www.rockite.com
Q I am
wondering if I can use Rockite to combine with
reduce the curing time. If so what ratio should I use?
is the short answer. How much will be determined by how fast you
want the mix to set. In the past I have used about 1 pound per
wheel barrow load, yet that
was for a specific job. There are many varibles to consider. Water in
mix, type of ground, clay, rock etc. Temperature is another factor in this
equation. I suggest that you work on a trial and error basis.
Apologies for not being absolute with specifics. This is the best
Q I have used Rockite to patch and level a concrete slab, in
preparation for installation of new prefinished wood plank floor.
The wood floor requires a water-based polyeurethane glue.
Will the glue readily adher to the Rockite?
A Further to your question,
In short the answer is yes. I personally would
not place wooden planks directly on to concrete. You need to
ensure that no moisture can migrate upwards. The
moisture will affect water based glues and long term damage
to floor boards if the concrete is not sealed. The trend now
is to float the floor.
Q TECHNICAL INFORMATION ABOUT SETTING HAND RAIL
A Further to your
request when setting hand rails, I have found everyone has
there own method.
I have encouraged installers to simply core drill.
Depending on the size of your stanchion will ultimately determine
the diameter of the hole. I know one company that most stanchions,
depending, are 45mm square. They generally drill 75-80 mm
They pour the Rockite and simply stand the stanchions
Remember that the concrete will suck the moisture content
out of the Rockite quite quickly so make sure that you test
rails etc first. If concrete base is warm at the time of
pouring, dampen with water as this will slow down the setting
process and will
also give you a stronger bonding.
Rockite works on hydraulic force. Test results as illustrated
on the website show that the greater the room for expansion
the greater your loadings.
If the project is outside and the Rockite is exposed to
weather use the water proof version of Rockite. Called Kwixset.
Q I need to patch about 100 conical surface holes ranging up to
2 inches in diameter and up to 1/4 inch deep in a concrete basement
slab. I will then paint over the surface with Epoxy shield. What
is the time I must wait for rockite to cure prior to epox
A The initial set is
about 15 minutes yet there will still be some moisture content
in the floor. This may create some challenges
re your surface coating.
I suggest that you give the rockite a chance to set for at least
two hours at the very minimum and then test patch a small area.
When you are
satisfied then proceed. Personally if I could give the Rockite
longer I would. The other concern is that the moisture content
in the concrete floor also should be thoroughly dry as the concrete floor will absorb
water from the Rockite.
When patching, it is recommended that you dust free the floor/holes
and dampen the concrete base that needs patching. This will create
a better bonding.
Q Our local city inspector has requested information about the
adhession between Rockite or Kwixset with glass and alluminum ballustrades?
A Thank you for your request for technical information on Rockite
working with glass and alumimum.
You did not mention if you were placing your aluminium channel
into the concrete floor or was it above. Some applicators/installers
have done away with aluminium as it is of little benefit.
On the following web pages there are a series of test results
published from tests conducted in the USA and New Zealand as
to the strength
properties of Rockite.
Rockite works on hydraulic force. You can see that we have illustrated
the increase in loadings where we have increased the diameter of
the holes. Depending on the expansion factor allowed, the loadings
will increase dramatically.
There is no specific adhesion between the glass and Rockite.
Some designers have created a small groove in the glass that
imbedded into the Rockite/Kwixset thus allowing a locking factor
for direct upward lift/tension.
You have not said if your project is internal or external. Please
note if external and exposed to the rain you will need to use our
water proof product Kwixset.
I trust that the above information meets your building inspectors
requirements and that he understands the nature of Hydraulic Forces
http://www.rockite.com/test.htm note test one and two.
Q Is there any chemical reaction between your products and alluminum stantions,
A Sir, thank you for your request. I have attached an article below that was
by an independent party and I believe this will answer your question.
EFFECT ON ALUMINIUM
The question of the effect of ROCKITE CEMENT on aluminium metal
has been raised many times in view of the growing popularity
of ornamental aluminium. Since aluminium is attacked by Portland
cement, it is only natural to question whether ROCKITE should
also have such an effect.
We're happy to state that ROCKITE has no corrosive effect whatever
on aluminium. As a matter of fact, every dishwasher knows that
their aluminium kitchen utensils are attacked by strong alkaline
cleaners. Therefore, they avoid them in their cleaning process.
Incidentally, Portland cement is alkaline - ROCKITE CEMENT is
A test was made with one end of a length of aluminium moulding
embedded in a patty of ROCKITE CEMENT. The specimen was then
subjected to a water bath intermittently for four months. At
the end of that period, there was no indication that the aluminium
had been attacked in any manner whatever, and for all practical
purposes it appeared to be in precisely the same condition as
it was when the test was begun.
This test, together with the fact that ROCKITE CEMENT has continued
to be used quite extensively for fastening aluminium throughout
the country, corroborates our contention that ROCKITE has no
injurious effect on aluminium and that its use in conjunction
with aluminium articles is quite safe.
ROCKITE definitely has no effect on aluminium. ROCKITE not only
offers the simplest, easiest, and strongest anchoring medium
known today but also eliminates the necessity of protecting ornamental
aluminium from the corrosive attack of Portland Cement and other