Compaction Grouting

Compaction grouting involves the injection of a grout into a soil substrate, displacing and “compacting” the soil in-situ, for the purpose of improving the soil’s strength profile.    The process was originally done with a thick cement-based grout pumped under high pressures.   Today the process can be done using expanding polymer grouts.

Compaction Grouting begins by driving small diameter injection rods into the substrate, specifically targeting the poor soils to be improved.   If a significant of obstructions (rock, rubble, concrete debris, etc) are present, the soil will have to be predrilled to allow the injection rods to be inserted into the ground.   Once the rods are successfully driven, liquid polymer is then injected into the soft ground.  This material will initially penetrate into the soil as a liquid, rapidly expanding up to twenty-five times its volume.   The polymer can exert up to 4,000 psi of pressure during its peak expansion, rapidly displacing soil and providing superior compaction effort.

This technology is used frequently to stabilize a settling foundation and can be performed with relatively limited site access.

Some examples of compaction grouting for stabilizing foundations include:

• Long’s Jewelers – Braintree, MA
• True by Hilton Hotel – Manchester, NH
• Best Buy – Nashua, NH

Contact us to see how we can help with your project.

Serving New England:  Massachusetts – New Hampshire – Maine – Rhode Island – Vermont  – Connecticut