ASTM C – 07 Standard Test Method for Potential Alkali-Silica Reactivity of Aggregates (Chemical Method) – Download as PDF File .pdf), Text File .txt) or. All the Controls products ASTM C standard. Enter now!. ASTM C Standard Test Method for Potential Alkali-Silica Reactivity of Aggregates (Chemical Method). Lab ID: Use A rapid indication of potential alkali.
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C x289 03 Standard Test Method for Potential Alkali-Silica Reactivity of Aggregates Chemical Method 1 This standard is issued under the fixed designation C ; 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.
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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. 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.
A specific precautionary statement is given in 5. Significance and Use 3. Do not use the results of tests by this test method as the sole basis for acceptance or rejection for sources with regard to ASR. The results from this test method can be obtained quickly, and, while not zstm reliable in all cases, they can provide useful data. Current edition approved Aug. Originally approved in Last previous edition approved in as C — A container that has been found suitable is shown in Fig. Other containers, made of corrosion-resistant material such as polyethylene, may be suitable.
NOTE 1—All dimensions are in mm. Use a mL aliquot of the solution to determine its SiO2 content by the procedure described in 8. Do not use a standard silica solution older than 1 year, since dissolved ionic silica in such a solution slowly polymerizes, causing spuriously x289 photometric readings see Note 2. Store c829 solution in a polyethylene bottle Note 2.
Protect the dry reagent and solution from ast, by carbon asttm. Store the solution in a chemically resistant glass container see Note 2. Standard volumetric flasks, burets, and pipets should be of precision grade. Unless otherwise indicated, all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available.
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. If the solution is not clear, filter through a fine-texture paper. Store the solution in c2899 polyethylene container ashm Note 2.
ASTM-CPotential Alcali-Silice Reactivity of – Free Download PDF
Store the solution in a chemically resistant glass or suitable plastic container see Note 2. Store in a polyethylene bottle see Note 2. HF can cause very severe burns and injury to unprotected skin and eyes. Suitable personal protective equipment should always be used. These should include full-face shields, rubber aprons, and gloves impervious to HF. Gloves should be checked d289 for pin holes.
Store the solution NOTE 2—In selecting the container, take care to ensure that the reagent will not be modified by reaction with the material composing the container, including pigments or other additives, or by ast, of phases through the walls of the container. Containers with wall thickness not less than 0.
Selection and Preparation of Test Samples 6. Use the sample sizes given in Table number 1 of Practice D Crush one half as described in 6. Retain the other half for c89 testing if desired. Crush one quarter as described in 6. Retain the other three quarters of the sample for further testing if desired.
Reduce the crushed sample to 6 5 g by splitting in accordance with Practice C Crush or grind the sample in small portions using a disk pulverizer, rotary mill rotatingpuck device, or mortar and pestle. NOTE 3—An over-pulverized sample may not produce the correct chemical test results. Do not wash more than g over a mm diameter sieve at one 3 C — 03 time.
Dissolved Silica by the Gravimetric Method 8. Without heating the residue further, treat it with 5 to 10 mL of HCl 1.
ASTM C Standard
Cover the dish and digest for 10 min on the steam bath or a hot plate. Dilute the solution with an equal volume of hot water, filter immediately through quantitativegrade, low—ash filter paper, and wash the separated silica SiO2 thoroughly with hot water see Note 5 and reserve the residue.
Place one portion in each of the three of the reaction containers, and add by means of a pipet, 25 mL of the 1. To a fourth reaction container, by means of a pipet, add 25 mL of the same NaOH solution to serve as a blank. Seal the four containers and gently swirl them to liberate trapped air. Use a porcelain Gooch crucible see Note 4 with a disk of rapid, analytical-grade filter paper cut to fit the bottom of the crucible, setting the crucible in a rubber crucible holder in a funnel.
Place a dry test tube, 35 to mL capacity, in the filter flask to collect the filtrate, and seat the funnel in the neck of the filter flask. With the aspirator in operation or the vacuum line open, decant a small quantity of the solution onto the filter paper so it will seat properly in the crucible.
Without stirring the contents of the axtm, decant the remaining free liquid into the crucible. When the decantation of the liquid has been completed, discontinue the vacuum and transfer the solids remaining in the container to the crucible and pack in satm with the aid of a stainless-steel spatula.
Then apply and adjust the vacuum to approximately 51 kPa. Continue the filtration until further filtration yields filtrate at the approximate rate of 1 drop every 10 s; reserve the filtrate for further tests.
Record the total amount of time during which the vacuum is applied as the filtration time; make every effort to achieve an equal filtration time for all samples in a set, by uniformity of procedure in the assembly of the filtration apparatus and the packing of the solids in the crucible. Dilute the solution with an equal volume of axtm water and catch and wash the small amount of SiO2 it contains on another filter paper.
This second evaporation is necessary only when determining the concentration of the standard sodium metasilicate solution in 5. For the other test solutions, it can be eliminated. NOTE 6—The mass of the empty crucible may be determined if one wishes to know the magnitude of impurities in the residue of SiO2. The difference between this determination and that previously obtained represents the amount of SiO2. Apply the vacuum for a length of time equal to the average filtration time for the three specimens.
Reserve this diluted solution for the determination of the dissolved SiO2 and the reduction in alkalinity. Dissolved Silica by the Photometric Method 9.
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The 4 C — 03 method is particularly applicable to rapid control c2889 of crystalloidal silica below 10 ppm.
Reduction in Alkalinity Preparation of Calibration Curve Transfer the portions of sodium silicate solution to mL volumetric flasks about half filled with water.
Allow the solution to stand for 15 min at room temperature. Allow the solution to stand for 5.
Read the transmittance of the various solutions on the photometer at nm, in comparison with that of water. Precision and Bias Determination of Dissolved Silica Read the concentration of silica in the solution directly from the previously prepared calibration curve correlating transmission of light of this wave length with silica concentration.
A potentially deleterious degree of alkali X1. However, potentially deleterious aggregates represented by points lying above the dashed line in Fig. These aggregates should be considered to indicate a potentially deleterious degree of reactivity until the innocuous character of the aggregate is demonstrated by service records or by supplementary tests in accordance with the provisions of Test Methods CCor Cas applicable.
The additional test method s should be ashm based on the mineralogical characteristics of the aggregate. It is recommended that these d289 properties be determined with a petrographic examination in accordance with the provisions of Guide C The error introduced by calcium carbonate is not significant unless Sc and Rc values indicate the potential reactivity is marginal. Examinations of the aggregate in accordance with Guide Ccan be used to determine the presence of minerals of this type.
The results of this test do not predict the late-slow silica-silicate reactivity in concrete that may result with aggregates c89 strained or micro-granulated quartz, or aggregates composed of metagraywacke, metasiltstone, meta-quartz, and similar rocks. Committee C09 has identified the location of selected changes to this standard since the last issue C — 01 that may impact the use of this standard.
Approved July 10, 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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
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