Page 68 - 2018 DIGITAL BROCHURE
P. 68
SHOTCRETE 513
Method of use Application
Preparing the surface Mixing General
Do not use on frozen or over For optimum results mix using A 10mm 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 513
used. Ensure that a 10mm SHOTCRETE 513 should be with water before placing in the dry
minimum thickness of material is added to the dry spray shotcrete spray machine. Protect the surface
obtained. machine and transported by dry of the SHOTCRETE 513 from direct
air to the nozzle where the water sunlight or wind until setting has
Priming is added. To obtain low dust completed. Once the SHOTCRETE
There is no need to prime any levels, better and more consistent 513 has set allow at least 1 hour
reinforcement, but if priming is mixing qualities, it is advisable before applying any finishes.
preferred, any conventional that the water is added to the
system may be used. SHOTCRETE 513 approximately Carry out the removal of all
1.5 metres from the end of the loose material from the concrete
nozzle. In cold weather the set and reinforcement. It is only
can be accelerated using warm necessary to remove rust from
water, likewise in hot weather cold the reinforcement. Prepare the
water can be used to slow down surface as described previously,
the set. 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 513
powder continuously to the dry
spray applicator machine with the
water being added and controlled
at the nozzle ensuring that the
SHOTCRETE 513 is worked
around any reinforcement.
