GENERAL COMMENTS:
Particle size determines the ability of these grouts to
penetrate extremely small openings, not
the viscosity of the material.
Ultrafine grout has been easily injected with Marsh Cone times as high
as 150 seconds.
A prevalent misconception throughout the grouting community
is that thinning the mix by adding more water is helpful in grouting
microfractures (<100 microns). This is not true! The additional water simply lowers the compressive strength of
the grout and increases its permeability.
Therefore:
Simply mix these grouts at the specified Water/Cement (W/C)
ratio, using a high shear, so-called “colloidal” mixer, such as the
colcrete. The type of mixer is very important.
A mixing time of one minute, following the addition of the grout is sufficient. The material should not remain in the mixer for more than three minutes, prior to discharge to an agitation tank. A paddle speed of about 60 rpm in the agitation tank is sufficient.
Mixing Procedure:
·
Type V Premium Grout
W/G Ratio = 0.6/1 (by weight of dry grout (BWOG)
1. Add the measured water to the mixer.
2. Add dispersant to mix water. (See separate dispersant/grout ratio instructions)
3. Mix dispersant in for 30 seconds or until dissolved.
4. Set mixer on top speed.
5. Add grout and mix for one minute.
·
Type V
Standard Grout
W/G Ratio = 0.8/1 (BWOG)
1. Add the measured water to the mixer.
2. Add dispersant to mix water. (See separate dispersant/grout ratio instructions)
3. Mix dispersant in for 30 seconds or until dissolved
4. Set mixer on top speed.
5. Add grout and mix for one minute.