Settlement is often attributable to inadequate fill material such as frozen fill or improper base compaction. Other causes contributing to a weak base soils condition also include: drying out of the ground surface layers (desiccation); reduction in water table level; wash-out caused by leaking water pipes, sewers and drains; excavations adjacent to buildings; inadequate foundation design; vibrations caused by heavy road traffic or adjacent construction sites; and base soils with different geological strata.
Whatever the cause for subsidence in the building floor slab or foundation, the base soils will require densification to enhance their load-bearing capacity to bear the loading of the building structure.
POLY-MOR uses a form of “chemical compaction grouting” where a special high density, hydro-insensitive expanding polymer resin is used to fill, densify and stabilize low density, compressible soils to depths of 30 feet and beyond. The POLY-MOR resins are delivered and placed at the appropriate depths in the required soils strata via drilled or driven injection probes . As the POLY-MOR resin is injected, it expands and provides a compaction or lift force of up to 50 tons per square meter thereby filling, compressing and compacting adjacent soils and significantly increasing the load bearing capacity of the base soils resting under a structure. Our soils densification process is also excellent for conglomerating and binding non-cohesive soils.
There are limitations to this process. The parameters of this treatment technique make it suited to a large range of cohesive soils including a wide range of clays up to 44% plasticity index. We are unable to treat clays, silts or other fine soils with large volumetric changes where thrust from the clay exceeds the dead load of the building or foundation weight or where the soils are so heavily compacted that our resins cannot permeate same. Also, in very weak alluvial soils such as peat, hog fuel, saturated silts and other weak sediments direct injection into same will densify the weak soils but an inordinate amount of expanding resin would be required and thus make the process uneconomical. Further, and in all cases, injection at depth is done blindly and there is no telling exactly where the expanding resin is traveling to. Before and After Standard Penetration Tests (SPT) are the only way to determine if the base soils have been densified sufficiently to accomplish the desired load bearing requirements.
POLY-MOR strongly advises that a third party engineering firm be involved to undertake and provide the appropriate soils testing and analysis of the “Before” and “After” SPT’s. In most cases Poly-Mor would recommend that a field test firstly be undertaken prior to any large scale treatment being undertaken
POLY-MOR material is guaranteed for a period of 10 years against any significant deterioration.
POLY-MOR material is light weight thereby adding little additional overburden weight to an already distressed sub-grade.
POLY-MOR material is highly insulative and therefore desirable to be used where perma frost and ice lensing is a consideration.
The POLY-MOR resins are environmentally friendly and no leaching takes place.
The closed cell nature of the POLY-MOR resins is impermeable to water and other liquids and is not affected by freeze-thaw cycling.
We are able to “fix dirt”!!! If you are challenged by a poorly compacted sub- grade, or a weak base soils strata at depth, or require agglomeration of base soils such as blast rock, etc., POLY-MOR technology will resolve your challenge! Do you have such a challenge?
This technology is applicable in the industrial, commercial, residential, public works and institutional markets where soils stabilization is required.