•
• •
• •
• •
• 5.1.5
Admixture compatibility trials (Clause 1.1.5.2)
Laboratory trial mixes (Clause 2.2.3.1)
Plant field trial mixes (Clause 2.2.3.2)
Trial panel for achievement of cover (Clause 2.3.2.6)
Full-scale mock-ups for cathodic protection (Clause 2.7.4.7)
Control panels for acceptability of finish (Clause 2.7.5.8)
2 100 m trial area of vacuum dewatering (Clause 2.7.5.10)
Prototypes of precast units (Clause 3.2.2)
Concrete Mix Allocation to Elements
The following guidelines and Table are provided in this Specification to assist with the identification
and communication of the Service Environment Zone, and the Structural/Durability/Assessment
Strengths, for all elements to be constructed.
• •
• The Designer should provide, on the Drawings or elsewhere, a table in the form of Table 22
below, and should provide the entries in the first three columns for each element of the Works.
The entries in the fourth column should be provided by the Concrete Supplier.
The entries in the fifth column should be provided by the Engineer
Table 22 Mix Allocation Table
Service Environment
Zone Durability
Strength Achieved in
Trials Assessment
Strength SS
Element Structural
Strength Zone ref
DS AS
Concrete Supplier
Engineer Table to be filled in by:
Designer Designer
Designer Example:
Basement walls
40 N/mm
5.2 Zone 6
55 N/mm
2 55 N/mm
2 Reference Documents
5.2.1 2
British Standards
Reference BS 812-2
BS 812-101
BS 812-102
BS 812-103.1
BS 812-103.2
BS 812-104
BS 812-105.1
BS 812-105.2
BS 812-109
Title Methods for the determination of density
Guide to sampling and testing aggregates
Methods for sampling
Method for determination of particle size distribution. Sieve tests
Method for determination of particle size distribution. Sedimentation
test Method for qualitative and quantitative. Petrographic examination of
aggregates Testing aggregates. Method for determination of particle shape –
Flakiness index
Testing aggregates. Method for determination of particle shape –
Elongation index of coarse aggregate
Methods for determination of moisture content
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