Method of backfilling
AssigneeK-Krete, Inc.
InventorsWilliam E. Brewer, Franklin V. Zimmer
Life of this patent
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Abstract
The invention relates to a controlled density fill material and a method of using such fill material in, for examples, the backfilling of sewers, embankments, structures and utility trenches. The material includes Portland cement, fly ash and aggregates. The material, while having some properties of both, is neither a soil nor a concrete.
Claims5
A method of backfilling a conduit wherein the conduit is installed in a trench, the method comprising installing the conduit, placing controlled density fill material over the conduit without compacting such fill material, such controlled density fill material consisting essentially of 2% to 6% be weight of Portland cement, 2 to 10% by weight of flyash, 70 to 90% be weight of aggregate and 5 to 15 % by weight of water, the fill material being sufficiently placeable and flowable that tamping or vibrating is unnecessary and having a concrete comparison 28-day compressive strength of less than 1400 psi, whereby the material may be easily re-excavated.
Dependencies are inferred from the claim text.