Acrylic grouts are exceptionally low viscosity (below 10 centipoise), whose reaction profiles can be controlled onsite, and which do not expand. Acrylic grouts are hydrophilic, with water comprising up to 75% of the finished product, thus are best suited to environments where they are not subject to very dry conditions.
There are two general classes of acrylic grouts; acrylamide, and acrylate. CJGeo primarily installs acrylate.
Acrylic grouts are comprised of a resin, which may be cut with water, and then pumped 1:1 with water. Both the resin and water have nominal quantities of supplemental admixtures which are used to control set time and reaction profile.
Straight resin pumped 1:1 with water will yield a gummy bear/soft silicone consistency finished product. Resin cut 1:1 with water and then pumped 1:1 with water will yield a cooked egg white consistency finished product.
Acrylic grouts are pumped as separate components up to the injection point. A mixing head designed to ensure through mixing between the two sides then mechanically hooks to injection tubing or ports to place the material.
Because acrylic grouts do not expand, and are barely more viscous than water, they generally can be pumped relatively quickly, as they are designed to quickly permeate out into the adjacent soils.
Acrylic grouts are excellent for permeating fine grained soils, binding them together, and significantly reducing their permeability. Unlike soils treated with single component polyurethane resins, soils grouted with acrylics are generally easily hand excavatable.
Aside from desired excavatability, acrylic grouts are generally chosen because of their very low viscosity, and therefore ability to penetrate very tight cracks, and also to follow very fine water flow channels.
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Kirk Roberts, d: 804-396-4845