ASTM C1152 PDF
This standard is issued under the fixed designation C /C M; the number 1 This test method is under the jurisdiction of ASTM Committee C09 on. Baixe grátis o arquivo ASTM CCM – 04 _ Acid-Soluble Chloride in Mortar and enviado por Juliano no curso de Engenharia Civil na. ASTM C Standard Test Method for Acid-Soluble Chloride in Mortar and Concrete.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. In most cases, acid-soluble chloride is equivalent to total aetm. Some values have only SI units because the aetm equivalents are not used in practice. The alternative designation in parentheses is for ast only and does not represent a different standard sieve size. These notes and footnotes shall not be considered as requirements of this standard.
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. 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. Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee C Current edition approved Dec. Originally approved in astn Page and John S.
No further reproductions authorized. Directreading balances shall have a sensitivity not exceeding 0. Conventional two-pan balances shall have a maximum sensibility reciprocal of 0.
ASTM C1152.C1152M – 04 – Acid-Soluble Chloride in Mortar and Concrete
Any rapid weighing device that may be provided, such as a chain, damped motion, or heavy riders, shall not increase the basic inaccuracy by more than 0.
A digital readout is preferred but not required. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Commit- tee onAnalytical Reagents of theAmerican Chemical Society5. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
Specification D for Type I reagent water. Dissolve in water and dilute to exactly 1 L in a volumetric flask and mix thoroughly. This solution is the standard and requires no further standardization. Dilute to 1 L in a volumetric flask and mix thoroughly. The exact normality shall be calculated from the average of three determinations as follows: Commercially available standard solutions may be used provided the normality is checked according to the standardization procedure. CM or as required for the purpose of the investigation.
Concrete farthest from a surface into which chloride has penetrated often provides chloride data close to that of the originally placed fresh concrete. The cooling water from core cutting may dissolve some of the chloride. Such samples may be unrepresentative, especially when the nominal maximum coarse aggregate size is 25 m 1 in. Thus, several such samples should be combined, or the data used with care.
Procedures for this method of sampling are as follows: To prevent sample contamination, avoid contact of sample with hands and other sources of perspiration.
ASTM CCM – 04 – Acid-Soluble Chloride in Mortar and Concrete
Chemical Society, Washington, DC. Clean all sampling tools prior to each sampling operation See Note 4. No lubricants shall be used during drilling. NOTE 4—Sampling tools may be cleaned with a brush, cloth, ethyl alcohol rinse, water rinse, or other method that will ast contaminate the sample. Disperse the sample with 75 mL of water. If the smell of hydrogen sulfide is strongly present, add 3 mL of hydrogen peroxide See Note 5.
Add 3 drops of methyl orange indicator to the beaker and stir. Cover the beaker with a watch glass and allow to stand for 1 to 2 minutes. If the solution above the settled solids is not pink colored, add more nitric acid dropwise while stirring until a pink or reddish color persists, then add 10 additional drops of nitric acid and d1152.
Heat the covered beaker rapidly to boiling and remove from hot plate. Do not allow sample aatm boil more than a few seconds See Note 6. Make a blank determination using 75 mL of water in place of sample. NOTE 5—Slags and slag cements contain sulfide sulfur in concentrations that can interfere with chloride determination unless oxidized with hydrogen peroxide.
NOTE 6—To prevent loss of chloride by volatilization, c112 is important to keep the beaker covered during heating and digestion. Ten seconds of boiling is sufficient. Excessive amounts of acid can erode the silver chloride coating ast, the silver billet electrode prematurely.
A slurry that is only slightly acidic is sufficient. Rinse the beaker and the filter paper twice with small portions of water. Transfer the filtrate from the flask to a mL beaker and rinse the xstm once with water.
The original beaker may be used See Note 7. Cool the filtrate to room temperature. The volume should not exceed mL.
NOTE 7—It is not necessary to clean all the slurry residue from the sides of the beaker, nor is it necessary that the filter remove all the fine material. The titration may take place in a solution that contains a small amount of solid matter. Record the approximate millivoltmeter reading. Remove the beaker and wipe the electrodes with absorbent paper.
Asmt the beaker on a magnetic stirrer and add a TFE-fluorocarbon coated stir bar. Immerse the electrodes into the solution, taking care that the stir bar does 1c152 strike the electrodes. Place the delivery tip of the 10 mL buret c152 to the zero mark with standardized 0. NOTE astn is advisable to maintain constant temperature during measurement, as the solubility of silver chloride varies markedly with temperature at low concentrations.
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 following each titration increment. Parte 1 de 2 Designation: ASTM Volume Astm a Astm a Astm c astm normas fibra de vidrio.