Grout and CLSM order quantities: casing/carrier annular space, full-bore pipe abandonment, and structure abandonment, with overage — in cubic yards, gallons, and sacks. Runs entirely offline; inputs persist in this browser via localStorage.
Use limits: Neat geometric volume plus your overage factor. Real annular grouting loses material to permeable backfill, joints, and takes in bulges of the bore — HDD and bore-and-jack overages of 25–50% aren't unusual where ground was lost during the crossing. If the take runs far past the estimate, stop and figure out where it's going (a nearby storm drain finding out for you is the bad version). Grout mix, pressure limits, lift heights on structures, and buoyancy of the carrier during grouting are per the approved plan.
Quantities
Neat volume
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Order volume (with overage)
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In gallons (pump/batch sizing)
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Sacks at entered yield
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Annular clearance (radial)
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How the Numbers Are Derived
The geometry
Annular: V = π/4 × (D_casing² − D_carrier²) / 144 × L (cf, diameters in inches)
Pipe abandonment: V = π/4 × D_ID² / 144 × L
Structure: V = L × W × depth
Conversions: 27 cf/CY, 7.48 gal/cf. A ready-mix or CLSM truck is typically ~10 CY; a grout plant batches by the cf — the gallons line helps size pump strokes and batch counts.
Field notes
Carrier buoyancy: an empty carrier pipe in a flooded annulus floats hard against the casing crown during grouting. Fill the carrier with water first, grout in stages, or use restrained spacers per the plan — an air-filled HDPE carrier in fluid grout generates serious uplift per foot.
Vents and verification: grout in at the low end, vent at the high end; the job is done when grout returns at the vent, not when the estimate says so. The estimate is for ordering, the vent is for acceptance.
Cellular (foamed) grout is common for large annulus and abandonment fills specifically because it's light (less carrier buoyancy differential, less pressure on old pipe) and flows far — yields and densities come from the supplier's design, not a standard table.
Abandonment: most specs require the abandoned line be verified full — bulkheads at both ends, fill from the low end, and account for the volume of any laterals or structures on the run that will also take grout.