A number in parentheses indicates the year of last reapproval. Inmost cases, acid-soluble chloride is equivalent to total chloride. Some values haveonly SI units because the inch-pound equivalents are not usedin practice. The alternative designation in parentheses is for informationonly and does not represent a different standard sieve size. These notes and foot-notes shall not be considered as requirements of this standard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.
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A number in parentheses indicates the year of last reapproval. In Hardened Concrete in Constructions most cases, acid-soluble chloride is equivalent to total chloride.
Significance and Use fication E The alternative designation in parentheses is for information only and does not represent a different standard sieve size.
However, some organic substances that may be intro- that provide explanatory information. These notes and foot- duced into mortar or concrete contain chloride that is initially notes shall not be considered as requirements of this standard. It is the very alkaline cement system. Blast-furnace slag aggregates and cements contain sulfide sulfur in concentrations that can cause such 2. Referenced Documents interference and produce erroneously high test results.
Treat- ment with hydrogen peroxide, as discussed in Test Methods 2. Such chloride will be detected by the Cement use of this method. Apparatus 4. Published January Originally pulverization : approved in DOI: 4. Hope, John A. Page and John S. No further reproductions authorized. Dissolve in water and dilute crete saw and one or more pulverizers.
This 4. Dilute to 1 L in a loss of smaller pieces. Standardize against 5. The exact normality shall to negligible levels the loss of fine particles. Conventional two-pan balances shall have a maximum provided the normality is checked according to the standard- sensibility reciprocal of 0. Any rapid weighing device ization procedure. Sampling 4. A digital readout is preferred but not required.
Unless otherwise indicated, it is intended that provides chloride data close to that of the originally placed fresh concrete. Such samples may without lessening the accuracy of the determination.
Thus, several 5. Procedures for this method of sampling are as follows: 6. For suggestions on the testing of reagents not to a specified depth or a depth sufficient to obtain a represen- listed by the American Chemical Society, see Analar Standards for Laboratory tative sample of the concrete mixture of at least 20 g of Chemicals, BDH Ltd. Pharmaceutical Convention, Inc. USPC , Rockville, powdered material.
To prevent sample contamination, avoid MD. No lubricants shall be used during drilling. Begin stirring gently. Place the delivery tip of the 10 mL buret filled to the zero mark NOTE 4—Sampling tools may be cleaned with a brush, cloth, ethyl alcohol rinse, water rinse, or other method that will not contaminate the with standardized 0.
Sample Preparation NOTE 9—If the tip of the buret is out of the solution, any adhering droplet should be rinsed into the beaker with a few millilitres of water 7. Procedure water. Record the nearest 0. Disperse the the buret reading and the corresponding millivoltmeter reading. If the smell of hydrogen sulfide is strongly present, add NOTE 10—Experience has shown that acceptable readings are obtained 3 mL of hydrogen peroxide See Note 5.
Add 3 drops of when the minimum scale reading does not change within a 5-s period. Cover the beaker with a watch glass and allow to stand for 1 to 2 minutes.
If the 8. Past the equivalence persists, then add 10 additional drops of nitric acid and stir. Continue to Heat the covered beaker rapidly to boiling and remove from titrate until three readings past the approximate equivalence hot plate.
Do not allow sample to boil more than a few seconds point have been recorded. See Note 6. Make a blank determination using 75 mL of 8. See Note 11 and subtract the results of the water blank See NOTE 5—Slags and slag cements contain sulfide sulfur in concentra- Note 12 tions that can interfere with chloride determination unless oxidized with NOTE 11—An example of recording solution, millivolt readings, and hydrogen peroxide.
Ten seconds of boiling is sufficient. Excessive amounts of acid can erode the silver NOTE 12—For nonreferee analysis, the blank may be omitted. A slurry that is only slightly acidic is sufficient. Calculation 8. Transfer the filtrate from the flask to a mL beaker and rinse the flask once with water. Cool the filtrate to titration equivalence point , room temperature. The volume should not exceed mL. Remove the beaker 0. Place the beaker on a magnetic stirrer and add a TFE-fluorocarbon coated stir bar.
The found to be 0. This precision statement applies to tests of samples prepared and ground by a single laboratory. The effect may be small for 9. Precision and Bias suitable for determining the bias for the procedure in this test Request RR:C ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
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More C However, some organic substances that may be introduced into mortar or concrete contain chloride that is initially acid-insoluble that can eventually ionize and thus become acid-soluble or water-soluble after a period of exposure in the very alkaline cement system. Blast-furnace slag aggregates and cements contain sulfide sulfur in concentrations that can cause such interference and produce erroneously high test results. Treatment with hydrogen peroxide, as discussed in Test Methods C , is used to eliminate such interference. Such chloride will be detected by the use of this method.