FAQ

What is Posi-Shell®?

Posi-Shell® is a spray-applied mineral mortar coating, similar to stucco, used as waste cover, erosion control and hydroseeding.

What equipment is needed to apply Posi-Shell®?

An application unit and towing unit are required for applying Posi-Shell® ADC.

Why should I use your equipment?

Our application equipment was designed specifically for landfill use, with rugged features and built in clean out reservoirs and water pumping units dedicated to the clean water. You will find this applicator most user friendly.

Do I have to use your equipment to apply Posi-Shell®?

No, Posi-Shell® may be applied through most common hydroseeding units.

What is the composition of Posi-Shell®?

Posi-Shell® is made up of water, mineral setting agent and high-tech fibres.

Are other formulations of Posi-Shell® available?

Yes, we have the capabilities to provide a variety of special coatings for special needs.

What do the fibres do in the Posi-Shell® mixture?

They reduce cracking and increase durability.

Why should I use Posi-Shell®?

Posi-Shell® is a multi-purpose product which saves airspace, provides a durable cover, is easy to apply and reduces costs.

Can I apply Posi-Shell® in the rain?

Our Advanced Formulation products can be successfully applied in rains up to about one-half inch per hour. For heavier rains our Extreme Rain Shield product should be added.

How is Posi-Shell® different than other spray applied products?

Posi-Shell® uses mineral mortar where others use paper and water.

Can Posi-Shell® be used for long-term cover?

Yes. In addition to daily and intermediate cover, Posi-Shell® is used for long-term cover and erosion control. With the addition of Portland cement, durability of up to several years is possible.

Will Posi-Shell® Damage my Leachate Collection Systemr?

NO – Posi-Shell® has been used at conventional and bioreactor landfills for 20 years with no documentation of damage to leachate collection systems. The cement ingredients (when used) in Posi-Shell® harden on the surface of the waste at the time of application. This one-time hydraulic cement reaction occurs only when the cover is first applied. If the hardened material later breaks up and is transported by liquids to the leachate system, it behaves the same as any other dirt, dust or other solid particles in the leachate. Soil covers contribute far more available solids than thin Posi-Shell® coatings and C&D landfills with a large amount of old cement materials do not report any greater incidence of leachate line clogging than MSW landfills.

It is true that leachate collection piping often exhibits a scaly hard build-up known in the landfill industry as “Bio-Rock,” however, this occurs in landfills not using Posi-Shell® as frequently as in those which do. Bio-Rock is generally formed by complex biochemical oxidation-reduction reactions with leachate solids slowly flowing through the intermittent semi-aerobic conditions in the leachate collection pipes. This explains pipe camera observations that there are no “stalagtites” forming downward from the perforation holes; instead the Bio-Rock builds in thin, hard layers from the bottom up, beginning at the leachate flow-line in the pipe. North America’s leading leachate maintenance contractor reports that the occurrence of Bio-Rock is independent of the use, or non-use of Posi-Shell®.

You can use Posi-Shell® with complete confidence, based upon decades of experience, that no damage will be done to your leachate collection system. The important key to a well functioning leachate collection system is regular, normal cleaning of collection lines to remove “Bio-Rock” before it clogs the line; this maintenance is equally important for landfills using Posi-Shell® or for landfills using any other type of cover.

 

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