ASTM C40 by Danny Neil Mateo Agustín

10. Interpretation

dannymateoagus — 2022-11-22 02:19:04 UTC

When a sample subjected to this procedure produces a color darker than the standard color, or organic plate No. 3, the fine aggregate under test will be considered as possibly containing deleterious organic impurities. It is advisable to perform other tests before approving fine aggregate for use in concrete.

7.Test Sample

carlosraulvelasquezsalazar — 2022-11-22 02:24:09 UTC

The test sample shall have a mass of about approximalety 450 g and be taken from the larger sample in accordance with practice C702.

1. SCOPE

escobarjesus2344 — 2022-11-22 02:26:25 UTC

A) This test method covers two procedures to be able to approximately determine the presence of harmful organic impurities in fine aggregates that are to be used in hydraulic cement mortars or concrete. This procedure uses a standard color solution and the other uses a glass color standard.
B) Values given in SI units are to be regarded as standard. Values given in parentheses are for information only.
C) 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.

11.Precision and Blass

dannymateoagus — 2022-11-22 02:30:33 UTC

This test does not produce a numerical value, therefore, determination of the precision and bias is not possible.

8.Procedure

carlosraulvelasquezsalazar — 2022-11-22 02:37:30 UTC

1. Fill a glass bottle to the approximalety 130 mL level with the sample of fine aggregate to be tested.
2. Add the sodium hydroxide solution until the volume of the fine aggregate and liquid, indicated after shaking, is approximalety 200 mL.
3. Stopper the bottle,shake vigorously, and then allow to the stand for 24 hours.

3. Significance and Use

escobarjesus2344 — 2022-11-22 02:38:33 UTC

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.

2. Referenced documents

escobarjesus2344 — 2022-11-22 02:41:48 UTC

- C 33 Specification for Concrete Aggregates
- C 87 Test Method for Effect of Organic Impurities in Fine Aggregate on Strength of Mortar
-C 125 Terminology Relating to Concrete and Concrete Aggregates
-C 702 Practice for Reducing Samples of Aggregate to Testing Size
-D 75 Practice for Sampling Aggregates
-D 1544 Test Method for Color of Transparent Liquids

4.1 APPARATUS

huertao027 — 2022-11-22 02:43:37 UTC

1.Colorless glass graduated bottles,of 240 to 470-mL (8 to 16-oz)
2. Provided with watertight caps or capsules.
3. A suitable instrument consists of five glass color patterns
mounted on a plastic stand.

REAGENT AND STANDARD COLOR SOLUTION

huertao027 — 2022-11-22 02:50:44 UTC

1 Reactivo Solución de hidróxido de sodio (3%)—Disolver 3
partes en masa de hidróxido de sodio grado reactivo (NaOH) en 97
partes de agua.

2 Solución de color estándar: disuelva el dicromato de potasio de grado reactivo (K2Cr2O7) en ácido sulfúrico concentrado (sp
gr 1,84).

Determination of Color Value

carlosraulvelasquezsalazar — 2022-11-22 02:57:06 UTC

Standard color solution procedure
At the end of 24 h standing period, fill a glass bottle to the approximalety 75 mL level with the fresh standar color solution, prepared not longer than 2 h previously. Hold the bottle with the standard color solution side by side, and compare the color ligth transmitted through the supernatant liquid about sample with the color of light transmitted through the standard color solution.

9.Determination of Color Value

carlosraulvelasquezsalazar — 2022-11-22 04:01:50 UTC

Standard Color Solution Procedure
At the end of the 24-h standing period, fill a glass bottle to the approximately 75-mL (21⁄2-fluid oz) level with the fresh standard color solution, prepared not longer than 2 h previously. Hold the bottle with the test sample and the bottle with the standard color solution side-by-side, and compare the color of light transmitted through the supernatant liquid above the sample with the color of light transmitted through the standard color solution.
Glass Color Standard Procedure
The comparison procedure described in 9.1 shall be used, except that the organic plate number which is nearest the color of the supernatant liquid above the test specimen shall be reported. When using this procedure, it is not necessary to prepare the standard color solution.