Page 60 - 2018 DIGITAL BROCHURE
P. 60
SHOTCRETE 430F
Method of use Application
Preparing the surface Mixing General
Do not use on frozen or over For optimum results mix using A 35mm minimum thickness of
heated substrates (outside the conventional dry spray mixing the material is always necessary.
range of 0°c-30°c). Prepare the machines. The optimum water Once setting has started DO NOT
surface in advance to provide an to cement ratio of 38% should attempt to remix or to smooth
adequate key. It should be clean, be aimed for. Exceeding this the surface. This will cause the
free from dust and thoroughly ratio will lead to lower strength, mechanical properties in particular
dampened. Where necessary longer setting time and the risk strength and adhesion to be lost.
steel or aluminium mesh can be of surface cracking appearing. Do not premix SHOTCRETE 430F
used. Ensure that a 35mm SHOTCRETE 430F should be with water before placing in the
minimum thickness of material is added to the dry spray shotcrete dry spray machine. Protect the
obtained. machine and transported by dry surface of the SHOTCRETE 430F
air to the nozzle where the water from direct sunlight or wind until
Priming is added. To obtain low dust setting has completed. Once the
There is no need to prime any levels, better and more consistent SHOTCRETE 430F has set allow
reinforcement, but if priming is mixing qualities it is advisable at least 1 hour before applying
preferred, any conventional that the water is added to the any finishes.
system may be used. SHOTCRETE 430F approximately
1.5 metres from the end of the Carry out the removal of all loose
nozzle. In cold weather the set material from the concrete and
can be accelerated using warm reinforcement. It is only
water, likewise in hot weather cold necessary to remove rust from
water can be used to slow down the reinforcement. Prepare the
the set. surface as described previously,
ensuring the surface is well
dampened but also ensuring there
is no standing water. Fix any
necessary reinforcement,
movement joints and formwork.
Add the dry SHOTCRETE 430F
powder continuously to the dry
spray applicator machine with the
water being added and controlled
at the nozzle ensuring that the
SHOTCRETE 430F is worked
around any reinforcement.
