Standard Test Method forOrganic Imp

Standard Test Method for
Organic Impurities in Fine Aggregates for Concrete
1
This standard is issued under the fixed designation C 40; 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
1.1 This test method covers two procedures for an approximate determination of the presence of injurious organic impurities in fine aggregates that are to be used in hydraulic cement
mortar or concrete. One procedure uses a standard color
solution and the other uses a glass color standard.
1.2 The values given in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
1.3This 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.
2. Referenced Documents
2.1ASTM Standards:
C 33 Specification for Concrete Aggregates
2
C 87 Test Method for Effect of Organic Impurities in Fine
Aggregate on Strength of Mortar
2
C 125 Terminology Relating to Concrete and Concrete
Aggregates
2
C 702 Practice for Reducing Samples of Aggregate to
Testing Size
2
C 1005 Specification for Reference Masses and Devices for
Determining Mass for Use in the Physical Testing of
Hydraulic Cements
3
D 75 Practice for Sampling Aggregates
4
D 1544 Test Method for Color of Transparent Liquids
(Gardner Color Scale)
5
3. Significance and Use
3.1 This test method is used in making a preliminary
determination of the acceptability of fine aggregates with
respect to the requirements of Specification C 33 that relate to
organic impurities.
3.2 The principal value of this test method is to furnish a
warning that injurious amounts of organic impurities may be
present. When a sample subjected to this test produces a color
darker than the standard color it is advisable to perform the test
for the effect of organic impurities on the strength of mortar in
accordance with Test Method C 87.
4. Apparatus
4.1Glass Bottles—Colorless glass graduated bottles, approximately 350 to 470-mL (12 to 16-oz) nominal capacity,
having approximately oval cross section, equipped with watertight stoppers or caps, not soluble in the specified reagents. In
no case shall the maximum outside thickness of the bottles,
measured along the line of sight used for the color comparison,
be greater than 60 mm (2
1
⁄2in.) or less than 40 mm (1.5 in.).
The graduations on the bottles shall be in millimetres, or
ounces (U.S. fluid), except that unmarked bottles may be
calibrated and scribed with graduations by the user. In such
case, graduation marks are required at only three points as
follows:
4.1.1Standard Color Solution Level—75 mL (21
⁄2oz (U.S.
fluid)),
4.1.2Fine Aggregate Level—130 mL (41
⁄2oz (U.S. fluid)),
and
4.1.3NaOH Solution Level—200 mL (7 oz (U.S. fluid)).
4.2Glass Color Standard
4.2.1 Glass standard colors shall be used as described in
Table 1 of Test Method D 1544.
NOTE 1—A suitable instrument consists of five glass color standards
mounted in a plastic holder. Only the glass identified as Gardner Color
Standard No. 11 is to be used as the Glass Color Standard in 9.2.
5. Reagent and Standard Color Solution
5.1Reagent Sodium Hydroxide Solution (3 %)—Dissolve 3
parts by mass of reagent grade sodium hydroxide (NaOH) in 97
parts of water.
5.2Standard Color Solution—Dissolve reagent grade potassium dichromate (K
2
Cr2O7) in concentrated sulfuric acid (sp
gr 1.84) at the rate of 0.250 g/100 mL of acid. The solution
must be freshly made for the color comparison using gentle
1
This test method is under the jurisdiction of ASTM Committee C-9 on Concrete
and Concrete Aggregates and is the direct responsibility of Subcommittee C09.20 on
Normal Weight Aggregates.
Current edition approved Aug. 10, 1999. Published August 1999. Originally
published as C 40 – 21 T. Last previous edition C 40 – 98.
2
Annual Book of ASTM Standards,Vol 04.02.
3
Annual Book of ASTM Standards,Vol 04.01.
4
Annual Book of ASTM Standards,Vol 04.03.
5
Annual Book of ASTM Standards,Vol 06.01.
1
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
heat if necessary to effect solution.
6. Sampling
6.1 The sample shall be selected in general accordance with
Practice D 75.
7. Test Sample
7.1 The test sample shall have a mass of about approximately 450 g (1 lb) and be taken from the larger sample in
accordance with Practice C 702.
8. Procedure
8.1 Fill a glass bottle to the approximately 130-mL (4
1
⁄2-fluid oz) level with the sample of the fine aggregate to be
tested.
8.2 Add the sodium hydroxide solution

Kết quả (Việt) 1:

Phương pháp kiểm tra tiêu chuẩnCác tạp chất hữu cơ trong phạt cốt liệu cho bê tông1Tiêu chuẩn này được phát hành dưới tên gọi cố định C 40; chỉ ra số ngay lập tức sau tên gọi năm gốcnhận con nuôi hoặc trong trường hợp sửa đổi, năm cuối sửa đổi. Một số trong ngoặc đơn chỉ ra năm cuối reapproval. Viết bên trên mộtEpsilon (e) cho thấy một sự thay đổi biên tập kể từ phiên bản cuối cùng hoặc reapproval.Tiêu chuẩn này đã được chấp thuận cho sử dụng bởi các cơ quan của bộ quốc phòng.1. phạm vi1.1 phương pháp thử nghiệm này bao gồm hai thủ tục xác định gần đúng một sự hiện diện của tạp chất hữu cơ nguy hiểm trong cốt liệu tốt đang được sử dụng trong thủy lực xi măngvữa, hoặc bê tông. Một trong những quy trình sử dụng một màu sắc chuẩngiải pháp và khác sử dụng một kính màu tiêu chuẩn.1.2 các giá trị được đưa ra trong các đơn vị SI là được coi là cáctiêu chuẩn. Các giá trị trong dấu ngoặc đơn là thông tinchỉ.1.3This tiêu chuẩn không nội dung để giải quyết tất cả cácan toàn liên quan, nếu có, kết hợp với việc sử dụng nó. Đó là cáctrách nhiệm của người sử dụng tiêu chuẩn này để thành lập phù hợp an toàn và sức khỏe thực hành và xác định các ứng dụng của quy định giới hạn trước khi sử dụng.2. tham khảo tài liệu2.1ASTM tiêu chuẩn:C 33 về cốt liệu bê tông2Phương pháp thử nghiệm 87 C cho ảnh hưởng của các tạp chất hữu cơ ở MỹTổng hợp trên sức mạnh của vữa2C 125 thuật ngữ liên quan đến bê tông và bê tôngAggregates2C 702 Practice for Reducing Samples of Aggregate toTesting Size2C 1005 Specification for Reference Masses and Devices forDetermining Mass for Use in the Physical Testing ofHydraulic Cements3D 75 Practice for Sampling Aggregates4D 1544 Test Method for Color of Transparent Liquids(Gardner Color Scale)53. Significance and Use3.1 This test method is used in making a preliminarydetermination of the acceptability of fine aggregates withrespect to the requirements of Specification C 33 that relate toorganic impurities.3.2 The principal value of this test method is to furnish awarning that injurious amounts of organic impurities may bepresent. When a sample subjected to this test produces a colordarker than the standard color it is advisable to perform the testfor the effect of organic impurities on the strength of mortar inaccordance with Test Method C 87.4. Apparatus4.1Glass Bottles—Colorless glass graduated bottles, approximately 350 to 470-mL (12 to 16-oz) nominal capacity,having approximately oval cross section, equipped with watertight stoppers or caps, not soluble in the specified reagents. Inno case shall the maximum outside thickness of the bottles,measured along the line of sight used for the color comparison,be greater than 60 mm (21⁄2in.) or less than 40 mm (1.5 in.).The graduations on the bottles shall be in millimetres, orounces (U.S. fluid), except that unmarked bottles may becalibrated and scribed with graduations by the user. In suchcase, graduation marks are required at only three points asfollows:4.1.1Standard Color Solution Level—75 mL (21⁄2oz (U.S.fluid)),4.1.2Fine Aggregate Level—130 mL (41⁄2oz (U.S. fluid)),and4.1.3NaOH Solution Level—200 mL (7 oz (U.S. fluid)).4.2Glass Color Standard4.2.1 Glass standard colors shall be used as described inTable 1 of Test Method D 1544.NOTE 1—A suitable instrument consists of five glass color standardsmounted in a plastic holder. Only the glass identified as Gardner ColorStandard No. 11 is to be used as the Glass Color Standard in 9.2.5. Reagent and Standard Color Solution5.1Reagent Sodium Hydroxide Solution (3 %)—Dissolve 3parts by mass of reagent grade sodium hydroxide (NaOH) in 97parts of water.5.2Standard Color Solution—Dissolve reagent grade potassium dichromate (K2Cr2O7) in concentrated sulfuric acid (spgr 1.84) at the rate of 0.250 g/100 mL of acid. The solutionmust be freshly made for the color comparison using gentle1This test method is under the jurisdiction of ASTM Committee C-9 on Concreteand Concrete Aggregates and is the direct responsibility of Subcommittee C09.20 onNormal Weight Aggregates.Current edition approved Aug. 10, 1999. Published August 1999. Originallypublished as C 40 – 21 T. Last previous edition C 40 – 98.2Annual Book of ASTM Standards,Vol 04.02.3Annual Book of ASTM Standards,Vol 04.01.4Annual Book of ASTM Standards,Vol 04.03.5Annual Book of ASTM Standards,Vol 06.01.1Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.heat if necessary to effect solution.6. Sampling6.1 The sample shall be selected in general accordance withPractice D 75.7. Test Sample7.1 The test sample shall have a mass of about approximately 450 g (1 lb) and be taken from the larger sample inaccordance with Practice C 702.8. Procedure8.1 Fill a glass bottle to the approximately 130-mL (41⁄2-fluid oz) level with the sample of the fine aggregate to betested.8.2 Add the sodium hydroxide solution