This month marks the first installment in a three-part series highlighting the key components of a GraniteCrete installation. This month we will be looking at proper moisture content during the mixing and installation process.
Adding Water to the Dry Decomposed Granite & GraniteCrete Admixture
For installations up to 3,000 square feet, the water can be added and mixed into the decomposed granite and GraniteCrete admixture manually. We recommend using a hose with a shower head/spray attachment, and a rake to thoroughly mix it into the dry material.
A consistent moisture level can be accomplished more efficiently by using a volumetric truck. With separate areas/hoppers for decomposed granite, GraniteCrete admixture, and water, these trucks are able to mix the materials together at the job site — saving valuable time, and improving consistency. For installations over 3,000 square feet, the use of a volumetric truck is required.
Assessing Optimum Moisture Content
A simple field test makes it easy to determine whether the optimum moisture content has been achieved:
Squeeze a handful of GraniteCrete firmly in your fist, then open your hand. When the color has just started to transfer onto your hand and the mixture just begins to hold together in a clump, it’s ready for installation.
If water oozes out when squeezed, the mixture is too damp — this can result in “sticky” materials, and complicate proper compaction or the quality of the finished surface. If the material is too damp, it may be placed on the bottom of the installation, with material that has the proper moisture content on top.
Proper moisture content is the first critical step in any installation of GraniteCrete. Next month, we’ll build on that foundation as we turn our focus to the next essential element: Compaction.