SECTION 0233 1
Part 1 — General
1.1 Section Includes
A.Materials, procedures, and testing for lightweight cellular concrete fill.
1.2 Related Sections
A.Section 03055: Portland Cement Concrete
1.3 References
A.ASTM C 495: Compressive Strength of Lightweight Insulating Concrete
B.ASTM C 796: Foaming Agents for Use in Producing Cellular Concrete Using Preformed Foam
1.4 DEFINITIONS Not Used
1.5 Submittals
A.Lightweight cellular concrete fill contractor qualifications for review . Include the following:
1.Contractor name and Utah Contractor’s License number.
2.Letter from the foam agent manufacturer qualifying the lightweight cellular concrete fill contractor to satisfactorily prepare and place lightweight cellular concrete fill .
3.List of project s demonstrating at least three years of experience with the placement of lightweight cellular concrete in similar applications .
4.List of projects where lightweight cellular concrete fill was successfully placed by the proposed project foreman.
B.Mix Design with mix proportions and test results for approval. Include at least the following:
1.Cement type and source
2.Fly ash type and source if used
3.Water source
4.Foaming agent information
5.Type and dosage of admixtures if used, including letter stating compatibility from the foaming agent manufacturer
6.Test results demonstrating the adequacy of the mix design
a.Include weight and calculate density of specimens tested per ASTM C 495.
b.Compressive strength according to ASTM C 495 except report compressive strength to the nearest 1 psi.
C.ASTM C 495 certification of the laboratory where compressive strength testing will occur , for information .
D.Work Plan for review. Include at least the following:
1.Planned construction schedule and sequence.
2.Placement procedures as recommended by the foaming agent manufacturer.
3.Type of equipment to be used.
4.Maximum single lift thickness as recommended by the foam manufacturer and details on construction of fill placement along slopes.
E.Cold weather protection plan for review as needed
1.Placement plan to address curing of lightweight cellular concrete, to reduce the risk of freezing of uncured materials, prior to placement of subsequent lifts.
2.Refer to this Section, Paragraph 3.1 B.
1.6 Acceptance
A.Prepare one set of four test specimens according to ASTM C 796 for the lightweight cellular concrete fill per each 300 cubic yards placed, but no fewer than one set per each day of placement.
1.Obtain samples for test specimens at the point of placement.
2.Verify density meets cast density in Table 3 at point of placement.
3.Use 3 x 6 inch cylinders for the test specimens.
4.Lightly tap the sides and/or bottom of the cylinder s to remove air pockets after filling approximately half of each cylinder and then again once each cylinder is full .
5.Do not rod lightweight cellular concrete fill samples .
B.Test compressive strength at an AASHTO accredited laboratory in accordance with ASTM C 495; report compressive strength to the nearest 1 psi.
C.The Department may accept material at a reduced price when the lightweight cellular concrete fill is below the specified 28- day compressive strength or above the specified cast density.
1.Apply the lowest applicable pay factor in Table 1 or Table 2 to the quantity of lightweight cellular concrete fill represented by the non-conforming test results. Table 1 Price Reduction for 28 -Day Compressive Strength PSI Below Specified Strength Pay Factor 1 to 5 0.9 6 to 10 0.7 More than 10 Reject * * The Engineer may accept a “reject ” lot based on an engineering analysis that demonstrates that the compressive strength is adequate to serve the design purpose. The Department applies a 0.5 pay factor if a reject lot is allowed to remain in -place. Table 2 Price Reduction for Cast Density Above Specified Cast Density Pay Factor 4 to 10% 1.0* 11 to 20% 0.7* More than 20% Reject* * Increases in density may have significant impact to the design intent . Any lot with a cast density test 4 percent or more above the specified cast density will require an engineering analysis to determine if the density is adequate to serve the design purpose. The Department applies pay factors as specified if the lot is allowed to remain in- place. The Department applies a 0. 5 pay factor if a reject lot is allowed to remain in -place.
Part 2 — Products
2.1 Classes
A.Meet the requirements of Table 3 for the Lightweight Cellular Concrete Fill class shown. Table 3 Lightweight Cellular Concrete Fill Classes Class Maximum Cast Density* (pcf) Minimum 28 -day Compressive Strength according to ASTM C 495 (psi) II 30 40 III 36 80 IV 42 120 V 50 160 VI 80 300 * Weigh cylinders before compressive strength testing and include weight and calculated density in the testing report.
2.2 Materials
A.Portland Cement . Refer to Section 03055.
B.Fly ash. Refer to Section 03055.
C.Foaming agent
1.As recommended by the manufacturer
2.Conforming to ASTM C 796.
D.Potable Water
E.Admixtures
1.Only as allowed by the foam manufacturer .
Part 3 — Execution
3.1 Preparation
A.Prepare subgrade area for lightweight cellular concrete fill to be free of loose material and to be of uniform moisture.
1.Complete clearing, grubbing, stripping, and stockpiling topsoil before placing material .
2.Do not place lightweight cellular concrete in standing water.
3.Perform other subgrade preparation as shown.
B.Place lightweight cellular concrete fill when the ambient temperature is forecast to stay above 32 degrees F for a period of 12 hours immediately after placement .
1.Do not place lightweight cellular concrete on frozen ground.
2.For subsequent lifts that are not in contact with the ground, the Engineer may authorize an appropriate cold weather protection plan if the ambient air temperature is forecast to stay above 28 degrees (F) for the first 12 hours after placement .
3.2 Placement
A.Mix the foaming agent with the cement and water on site as recommended by the foam manufacturer.
B.Place lightweight cellular concrete fill in lifts no thicker than 3 ft, or according to foam manufacturer if their recommend ed maximum lift thickness is less than 3 ft.
1.B ench into existing embankment if placed adjacent to existing materials as shown .
C.Allow each lift to cure at least 12 hours before placing the subsequent lift.
1.R emove any crumbling or flaking material or material that is otherwise compromised from the previously poured surface .
3.3 Protection
A.Protect lightweight cellular concrete fill material from conditions which may cause degradation or otherwise impact its properties and performance, including precipitation, inclement weather, and excessive moisture absorption
B.Do not operate heav y construction equipment or place soil backfill on the lightweight cellular concrete fill until the specified 28- day compressive strength has been attained.
C.Place and compact a minimum loose thickness of 6 inches over the lightweight cellular concrete before operating any earthwork equipment over the area.
1.Protect the edges of lightweight cellular concrete from damage due to earthwork or other operations.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 282–286 of 1,331.