27 PCF
Usual start- Foam %
- 81.6% ± 2.5
- Typical 28-day
- ~107 psi
- Best for
- Usual pipe abandonment start — lightest fill
Mix designs
Cellular
The four most popular cellular grout packets — 27, 33, 38, and 45 PCF — all generated from the same 108 PCF neat-cement base slurry. Only the foam rate changes. Tank and pipe decommissioning, foundation and abutment backfill, annular fill, and void fill.
Most pipe abandonment starts at 27 or 33 PCF. Use 38 or 45 PCF only when the engineer specifies higher strength or density. Size full pipe, annular grout, culvert, or tank fill with the Pipe Abandonment Calculator.
Compare the four most popular
All four use the same Base Slurry 108 PCF. Only the foam rate changes.
33 PCF
Usual start- Foam %
- 77.5% ± 2.5
- Typical 28-day
- ~145 psi
- Best for
- Usual pipe abandonment start — lightweight annular
38 PCF
- Foam %
- 74% ± 2.5
- Typical 28-day
- ~180 psi
- Best for
- When the engineer specifies a higher density
45 PCF
- Foam %
- 69.4% ± 2.5
- Typical 28-day
- ~230 psi
- Best for
- When the engineer specifies higher strength or density
Cellular Grout 27 PCF + Base Slurry 108 PCF
Usual startUsual start for pipe abandonment. The lightest published Volume cellular fill — 27 PCF, about 82% foam, ~107 psi. Same 108 PCF neat-cement base slurry as the rest of the cellular family. Annular space, abandoned pipe, void fill, and low-pressure foundation backfill.
~107 psi (27 PCF) · N/A
Cellular Grout 33 PCF + Base Slurry 108 PCF
Usual startUsual start for pipe abandonment. Mid-light Volume cellular fill — 33 PCF, about 78% foam, ~145 psi. Same 108 PCF neat-cement base slurry as 27 / 38 / 45. Annular space, abandoned pipe, void fill, and foundation backfill.
~145 psi (33 PCF) · N/A
Cellular Grout 38 PCF + Base Slurry 108 PCF
38 PCF cellular backfill, about 74% foam, ~180 psi. Same 108 PCF neat-cement base slurry as 27 / 33 / 45. For pipe abandonment, use this density when the engineer specifies higher strength or density than 27 or 33 PCF. One packet covers both the 38 PCF cellular grout and the 108 PCF base slurry.
~180 psi (38 PCF) · N/A
Cellular Grout 45 PCF + Base Slurry 108 PCF
The densest published Volume cellular fill — 45 PCF, about 69% foam, ~230 psi. Same 108 PCF neat-cement base slurry as 27 / 33 / 38. Annular space, abandoned pipe, void fill, and foundation backfill when the spec wants more unit weight.
~230 psi (45 PCF) · N/A
Optional more on the sister site: cellularbackfill.com. Delivered by Volume Concrete. Call Dispatch to schedule or price a load.