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©
Canadian Standards Association
Precast concrete — Materials and construction
November 2009
7.3.3 Limits for deleterious substances
Fine aggregate for architectural concrete with exposed aggregate finishes exposed to the weather shall
conform to the limits specified in the following table when tested in accordance with Test Methods
A23.2-3A, A23.2-4A, and A23.2-5A in CSA A23.2, unless an exposure for at least 5 years under similar
environmental conditions indicates acceptable durability and appearance:
7.3.4 Organic impurities
Fine aggregate tested in accordance with Test Method A23.2-7A in CSA A23.2 shall not produce a colour
darker than the standard colour.
7.4 Coarse aggregate
7.4.1 General
Coarse aggregate for architectural concrete shall comply with
Clauses 7.1
and
7.4.2
to
7.4.5
.
7.4.2 Grading
Coarse aggregate for architectural concrete shall comply with the grading requirements of CSA A23.1,
except when a special architectural appearance is required or exposure for at least five years under similar
environmental conditions indicates satisfactory performance of the concrete mix.
7.4.3 Limits for deleterious substances and physical properties
Coarse aggregate for architectural concrete with exposed aggregate finishes exposed to the weather shall
conform to the limits specified in the following table when tested in accordance with the test methods
specified in Clause 4 of CSA A23.1 unless exposure of at least 5 years under similar environmental
conditions indicates acceptable durability and appearance:
7.4.4 Staining materials
Aggregates with iron compounds or other potentially staining materials shall not be used in architectural
concrete that will be exposed to the weather unless the owner has been informed of the potential risks
and consequences associated with the use of such aggregates. When tested in accordance with
ASTM C641, such aggregates shall have a stain index of less than 20.
3UBSTANCE
-AXIMUM BY MASS OF TOTAL SAMPLE
Clay lumps
1.0
Coal or lignite particles
0.5
Material passing an 80 μm sieve
2.0
Note:
See also Table 12 of CSA A23.1.
3UBSTANCE OR PHYSICAL PROPERTY
-AXIMUM BY MASS OF TOTAL SAMPLE
Clay lumps
0.25
Coal particles
0.5
Material passing an 80 μm sieve
1.0
Magnesium sulphate soundness loss
12
Abrasion loss
35
Note:
See also Table 12 of CSA A23.1.
Licensed for/Autorisé à Jed Friesen Sold by/vendu par CSA on/le June/18/2015.
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