ASTM C35-95(2000)
(Specification)Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster
Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster
SCOPE
1.1 This specification covers perlite, vermiculite, natural and manufactured sand for use as gypsum plaster aggregates.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.3 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
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Designation: C 35 – 95 (Reapproved 2000)
Standard Specification for
Inorganic Aggregates for Use in Gypsum Plaster
This standard is issued under the fixed designation C 35; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * 3.2.2 natural sand, n—the fine granular material resulting
from the natural disintegration of rock or from the crushing of
1.1 This specification covers perlite, vermiculite, natural
friable sandstone.
and manufactured sand for use as gypsum plaster aggregates.
3.2.3 perlite aggregate, n—a siliceous volcanic glass ex-
1.2 The values stated in inch-pound units are to be regarded
panded by heat.
as the standard. The values given in parentheses are provided
3.2.4 vermiculite aggregate, n—a micaceous mineral ex-
for information purposes only.
panded by heat.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Chemical Composition
responsibility of the user of this standard to establish appro-
4.1 Water-soluble impurities in sand shall not exceed 0.15
priate safety and health practices and determine the applica-
weight % and sodium ion content shall not exceed 0.02 weight
bility of regulatory limitations prior to use.
% when tested in accordance with Section 7.
2. Referenced Documents 4.2 Sand shall develop a color no darker than the standard,
when subjected to the colorimetric test for organic impurities in
2.1 ASTM Standards:
accordance with Test Method C 40, unless it is established by
C 11 Terminology Relating to Gypsum and Related Build-
adequate tests that the impurities causing the color are not
ing Materials and Systems
harmful in plaster.
C 29/C 29M Test Method for Unit Weight and Voids in
Aggregate
5. Mechanical Requirements
C 40 Test Method for Organic Impurities in Fine Aggre-
3 5.1 Grading—Shall be as follows when tested in accor-
gates for Concrete
dance with Section 7.
C 136 Test Method for Sieve Analysis of Fine and Coarse
3 5.1.1 Perlite and vermiculite shall be graded within the
Aggregates
limits specified in Table 1.
C 471 Test Methods for Chemical Analysis of Gypsum and
2 5.1.2 Natural and Manufactured Sand— Shall be graded
Gypsum Products
with not more than 50 % retained between any two consecutive
D 75 Practice for Sampling Aggregates
sieves shown in Table 1, nor more than 25 % between the No.
E 11 Specification for Wire-Cloth and Sieves for Testing
5 50 (300 μm) and No. 100 (150 μm) sieves.
Purposes
5.2 Density:
3. Terminology 5.2.1 Perlite shall have a density of not less than 6 nor more
3 3
than 12 lb/ft (96 to 192 kg/m ) when tested in accordance with
3.1 Definitions shall be in accordance with Terminology
Test Method C 29/C 29M using the shoveling procedure.
C11.
5.2.2 Vermiculite shall have a density of not less than 6 nor
3.2 Definitions of Terms Specific to This Standard:
3 3
more than 10 lb/ft (96 to 160 kg/m ) when tested in accordance
3.2.1 manufactured sand, n—the fine material resulting
with Test Method C 29/C 29M using the shoveling procedure.
from the crushing and classification by screening, or otherwise,
of rock, gravel or blast furnace slag.
6. Sampling
6.1 Apparatus—Suitable thief tube.
This specification is under the jurisdiction of ASTM Committee C11 on Ceiling
6.2 Bulk Aggregate—Obtain specimens of sand in accor-
and Walls and is the direct responsibility of Subcommittee C11.02 on Specifications
dance with Practice D 75.
and Test Methods for Accessories and Related Products.
Current edition approved July 15, 1995. Published October 1995. Originally 6.3 Bagged Aggregate—Obtain from one bag randomly
published as C 35-21 T. Last previous edition C 35 – 89a.
selected from each 100 bags but not less than 6 bags from the
Annual Book of ASTM Standards, Vol 04.01.
shipment. For smaller shipments, not less than 6 % of the
Annual Book of ASTM Standards, Vol 04.02.
number of bags shall constitute the sample.
Annual Book of ASTM Standards, Vol 04.03.
Annual Book of ASTM Standards, Vol 14.02.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C35
TABLE 1 Grading Requirements
7.5.2 Apparatus:
Percentage Retained on Each Sieve, Cumulative 7.5.2.1 Analytical Balance, with a precision of 0.0001 g.
7.5.2.2 Balance, capable of weighing at least 10 g to a
Perlite, Vermiculite, Sand,
Sieve Size
by volume by volume by weight
precision of 0.1 g.
7.5.2.3 Desiccator, containing calcium chloride or equiva-
Max Min Max Min Max Min
lent desiccant.
No. 4 (4.75-mm) 0 . 0 . 0 .
No. 8 (2.36-mm) 5 0 10 0 5 0
7.5.2.4 Drying Oven, capable of being controlled to 250°F
No. 16 (1.18-mm) 60 5 75 40 30 5
(121°C).
No. 30 (600-μm) 95 45 95 65 65 30
7.5.2.5 Filter Paper—A “fast” filter paper shall be used.
No. 50 (300-μm) 98 75 98 75 95 65
No. 100 (150-μm) 100 85 100 90 100 90
NOTE 1—S & S Black Ribbon or Whitman No. 41 have been found
No. 200 (15-μm) 100 95
suitable for this purpose.
7.5.2.6 Atomic Absorption or Ion Chromatography Equip-
6.3.1 Secure specimens by inserting a suitable thief tube the
ment.
full distance between diagonally opposite corners of the bag
7.5.2.7 Mechanical Shaker.
with the bag lying in a horizontal position. Combine the
7.5.3 Procedure:
portions to produce a composite specimen having a volume not
(Water Soluble Impurities.)
3 3
less than 1 ft (0.028 m ). Prepare and test not less than one
7.5.3.1 Weigh approximately 10 g of air-dried sand and
composite specimen separately for each 2000 bags of aggre-
record the weight to 0.1 g. Transfer to a 250-mL beaker. Add
gate.
100 mL of distilled water. Heat to boiling and allow to simmer
6.4 Reduce specimens obtained in accordance with 6.2 or
on a hot plate for 5 min. Filter through a fast paper into a tared
6.3 by quartering or riffling to obtain specimens of proper size
evaporating dish. Wash with hot distilled water until the
for individual tests.
volume of filtrate is about 125 mL. Evaporate to dryness in an
7. Test Methods oven without allowing the temperature of the dish to rise above
250°F (121°C). Cool residue in a dessicator, weigh to 0.001 g
7.1 Apparatus:
and calculate the percentage of residue on the initial weight of
7.1.1 Sieve—Specification E 11, Nos. 4, 8, 16, 30, 50, 100,
sand.
200 (4.75, 2.36, 1.18 mm, 600 μm, 300 μm, 150 μm, 15 μm).
7.5.3.2 Report—Report percentage as water solu
...
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