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ASTM C618-12a
Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete (Includes all amendments And changes 10/2/2015).
Automaticky přeložený název:
Standardní specifikace pro uhlí popílku a Raw nebo kalcinovány Přírodní pucolánu pro použití v betonu
NORMA vydána dne 15.12.2012
Informace o normě:
Označení normy: ASTM C618-12a
Poznámka: NEPLATNÁ
Datum vydání normy: 15.12.2012
Kód zboží: NS-14289
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Anotace textu normy ASTM C618-12a :
Keywords:
fly ash, natural pozzolan, pozzolans, ICS Number Code 91.100.30 (Concrete and concrete products)
Doplňující informace
| 1. Scope | |||
|
1.1 This specification covers coal fly ash and raw or calcined natural pozzolan for use in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to fly ash or pozzolans may be desired, or where both objectives are to be achieved.
|
Class |
||
|
N |
F |
C |
|
|
Silicon dioxide (SiO2) plus aluminum oxide
(Al2O3) plus iron oxide
(Fe2O3), |
70.0 |
70.0 |
50.0 |
|
Sulfur trioxide (SO3), max, % |
4.0 |
5.0 |
5.0 |
|
Moisture content, max, % |
3.0 |
3.0 |
3.0 |
|
Loss on ignition, max, % |
10.0 |
6.0A |
6.0 |
Class
N
F
C
Fineness:
Amount retained when wet-sieved on 45 μm (No. 325) sieve, max, %
34
34
34
Strength activity index: A
With portland cement, at 7 days, min,
percent of
control
75B
75B
75B
With portland cement, at 28 days, min,
percent of
control
75B
75B
75B
Water requirement, max, percent of control
115
105
105
Soundness: C
Autoclave expansion or contraction, max, %
0.8
0.8
0.8
Uniformity requirements:
The density and fineness of individual
samples
shall not vary from the average established by the
ten preceding tests, or by all preceding tests if the
number is less than ten, by more than:
Density, max variation from average, %
5
5
5
Percent retained on 45-μm (No. 325), max
variation,
percentage points from average
5
5
5
Class
N
F
C
Increase of drying shrinkage of mortar
bars at 28 days, max, difference, in %,
over controlA
0.03
0.03
0.03
Uniformity Requirements:
In addition, when air-entraining
concrete is specified, the quantity of air-
entraining agent required to produce an air content of 18.0 vol %
of mortar
shall not vary from the average established by the ten preceding
tests or by all
preceding tests if less than ten, by more than, %
20
20
20
Effectiveness in Controlling Alkali-Silica Reaction:B
Expansion of test mixture as percentage
of low-alkali cement control, at 14
days, max, %
100
100
100
Effectiveness in Contributing to Sulfate Resistance:C
Procedure A:
Expansion of test mixture:
For moderate sulfate exposure after 6 months exposure, max, %
0.10
0.10
0.10
For high sulfate exposure after 6 months exposure, max, %
0.05
0.05
0.05
Procedure B:
Expansion of test mixture as a
percentage of sulfate resistance cement
control after at least 6 months exposure, max,%
100
100
100
1.2 The values stated in SI units
are to be regarded as standard. No other units of measurement are
included in this standard.
1.3 The text of this standard references notes and footnotes, which provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
|
Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete |
|
|
Standard Terminology Relating to Concrete and Concrete Aggregates (Includes all amendments and changes 10/14/2021). |
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