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Stabilization Of Joint Sand
Sand joints allow for:
- Thermal expansion and contraction of the entire mass.
- Easy removal and replacement of pavers. For example, temporary access to piping, replacement due to damage, or changing to other colors to create a pattern.
The advantages of stabilizing the joint sand are:
- Prevent loss from wind or water that weakens the installation.
- Prevent efflorescence.
- Prevent weed and grass growth.
- Prevent sand being tracked into buildings and damaging floor finishes.
Instead of another operation using a type of glue that is added to the joint sand, a better and less costly effect is achieved by simply using one of the Aldon solvent based penetrating sealers shown below.
This example is with clay brick - "common type". However, the discussion applies to all pavers.
For purposes of this demonstration two brick were taped together with small spacers to create the joint gap. The gap was then packed with the same sand used for paver installations. Unlike typical paver installations, no vibration was used. Therefore, the sand was less stable and more of a worst case scenario.
"A" - "S-B-S Sealer" applied to half the joint
"B" - "Porous Stone Sealer" applied to other half
Note gloss next to the joint from the higher solids "Porous Stone Sealer".
After curing, the brick were tipped up and placed under running water to simulate heavy and continuous water erosion.
"A" - "S-B-S Sealer"
"B" - "Porous Stone Sealer"
There was no loss of sand from either half after one hour.
Two piles of sand were placed on a piece of glass.
"S-B-S Sealer" was poured on one pile and "Porous Stone Sealer" on the other. Result: sand is firmly glued together and bonded to the glass.
The glass was tipped up and placed under continuously running water.
No sand removed from either pile, even after one hour.
All large paver installations will move from thermal expansion and contraction. If this movement opens a stabilized sand joint, it only requires sweeping more sand into the opening and applying more sealer. The new sealer "melts" the old and the joint is returned to its former status.