Mudjacking has a lot of names. Some refer to it as concrete raising, concrete lifting, concrete leveling or even slabjacking. It’s a highly effective and affordable way to repair sinking concrete. Traditional mudjacking companies typically inject an organic-based mud slurry into the sinking slab which fills the voids and ultimately lifts and levels the sinking concrete.
Over the years, new ‘technologies’ have been introduced including polyurethane or, foam concrete raising. This new technology has been pitched as a ‘fast, effective’ way to repair concrete. However; according to some experts, it’s less effective to triditional mudjacking, and not enviornmentally friendly.
“Because the injected material [foam] reacts and reaches its maximum volume in increments shortly following injection, significant voids remain after treatment. This was found to be the case when a bridge approach slab near the Denver airport that had been so treated [with foam] continued to settle and was subsequently removed,” wrote Warner, James, Professional Engineer, Author of the Practical Handbook of Grouting: Soil; Rock; and Structures. N.p.: n.p., 2004. Print., emphasis added]
This manufacturer states Polyurethane foam is ‘Extremely flammable aerosol, may burst if heated, causes skin irritation, harmful if inhaled, may cause allergy or asthma symptoms or breathing difficulties if inhaled, may cause serious respiratory irritation and is even suspected of causing cancer…
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