STRUCTURAL CONCRETE – LIGHTWEIGHT
PART 1 GENERAL
1.1SECTION INCLUDES
A.Structural lightweight concrete using lightweight aggregate for the coarse
aggregate portion of the mix.
1.2RELATED SECTIONS
A.Section 03055: Portland Cement Concrete
1.3REFERENCES
A.AASHTO M 195: Lightweight Aggregates for Structural Concrete
B.AASHTO T 104: Soundness of Aggregate by Use of Sodium Sulfate or
Magnesium Sulfate
C.AASHTO T 121: Density (Unit Weight), Yield, and Air Content
(Gravimetric)of Concrete
D.AASHTO T 196: Air Content of Freshly Mixed Concrete by the Volumetric
Method
E.ASTM C 567: Determining Density of Structural Lightweight Concrete
F.UDOT Minimum Sampling and Testing Requirements
1.4DEFINITIONS
A.Structural Lightweight Concrete – A lightweight Portland Cement Concrete
mix (used to reduce the dead load of the structure) with all of the attributes and performance equal to normal weight structural concrete and with a lower unit weight.
Structural Concrete – Lightweight
1.5SUBMITTALS
A.Refer to Section 03055, except as modified in this Section.
1.Include in the concrete mix design submittal in addition to the
requirements in Section 03055:
a.The weight and absolute volume for each component.
b.The unit weight of the fresh concrete mix for the purposes of
acceptance.
c.Test reports showing that the equilibrium density of the
concrete mix meets the requirements of this Section, Article
2.1Paragraph B.
1.6ACCEPTANCE
A.Acceptance is according to Section 03055 and the UDOT Minimum
Sampling and Testing Requirements.
1.Air content will be determined by AASHTO T 196.
2.Density/unit weight of fresh concrete with each air content
determination. Refer to AASHTO T 121.
PART 2 PRODUCTS
GENERAL
A.Refer to Section 03055, except as modified in this Section.
B.Keep the equilibrium density of the mix between 110 to 115 lb/ft3 as
determined according to ASTM C 567.
C.Do not allow the unit weight of the fresh concrete to vary more than ± 4
lb/ft3 from the target density for fresh concrete established by the mix design for field acceptance.
D.Aggregates
1.Coarse Aggregate
a.Meet the requirements of AASHTO M 195.
1) Meet AASHTO M 195 Table 1, gradation band ½ inch to #4 or ¾ inch to #4.
b.Use lightweight aggregates that have not more than 5
percent loss, when tested for soundness using Magnesium Sulfate (5 cycles). Refer to AASHTO T 104.
Structural Concrete – Lightweight
E.Mix Design
1.Base the mix design on the recommendations of the lightweight
aggregate manufacturer for each combination of materials to be used.
F.Aggregate Stockpiles
1.Uniformly pre-wet or pre-saturate the aggregates in such a manner
that uniform penetration of the concrete will be maintained.
G.Batch Materials
1.Batch lightweight coarse aggregate either by weight or by volume.
Equip the batching equipment if by volume such that the weight of each size of aggregate in the batch can be verified.
2.Verify each load using batched weights of materials.
PART 3 EXECUTION
3.1GENERAL
A.Refer to Section 03055.
END OF SECTION
Structural Concrete – Lightweight
Structural Concrete in other states
Utah revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 901–903 of 1,331.
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