ASTM C Rapid Chloride Permeability Test. T E C H N I C A L. B U L L E T I N T B – 0 1 0 0. Concrete. Introduction. This test method was originally developed. This test method (ASTM C ) covers the determination of the electrical conductance of concrete to provide a rapid indication of its resistance to the. This standard is issued under the fixed designation C; the number immediately 1 This test method is under the jurisdiction of ASTM Committee C09 on.
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Based on the initial current, the operator selects the test voltage and test duration in accordance with recommendations in NT Build Powered by WordPress Theme Designed satm It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. The negatively charged ions will migrate towards the positive terminal resulting in current through the specimen.
Examples of such correlations are discussed in Refs 1- 5. Test results are corrected for a standard specimen diameter of 95 mm.
The window shows the details of the test. No other units of measurement are included in this standard. Customized c12022 can be attached to each test for complete project documentation.
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As was discussed on page 88, there is a theoretical relationship between the chloride diffusion coefficient and electrical conductivity. Test results can be exported to Excel for comprehensive statistical analyses of the results and preparing user defined control charts. The above plots show that there are strong relationships between the various electrically based test methods and the apparent chloride diffusion coefficient. A complete system composed of coring and slicing equipment, vacuum desiccator, vacuum pump, watertight test cells, microprocessor power supply, and software are presented below.
The bulk electrical conductivity is calculated using Eq. As discussed on page 88, ast conductivity is related to the diffusion coefficient. When using this test for determining acceptability of concrete mixtures, statistically-based aatm and test age for prequalification, or for acceptance based on jobsite samples, should be stated in project specifications.
By measuring the current passing through a saturated concrete specimen and determining the bulk conductivity in accordance with ASTM C The following gaskets are available for different specimen diameters: The cells are easy to assemble, simple to maintain, and watertight.
Readings are ashm every 5 seconds. The last plot lower right also shows the theoretical relationship. Acceptance criteria for this test should consider the sources of variability affecting the results and ensure balanced risk between supplier and purchaser.
The test result, however, is reported as a rate of penetration, by dividing the depth of penetration, in mm, by the product of applied voltage V and the test duration h. From the penetration depth and test conditions, the chloride ion migration coefficient is calculated. Testing up to 8 cells simultaneously Voltage settings of 5 to 60 VDC in 5 V increments Programmable testing time as required Temperature measurement and recording Cyclic testing option for effect of curing duration Measure concrete conductivity at 60 VDC in 1 min Predicted 6-h Coulomb value every 5 min Documentation of each test result A complete system composed of coring and slicing equipment, vacuum desiccator, vacuum pump, watertight test cells, microprocessor power supply, and software are presented below.
When this method is used for mixture qualification and acceptance testing, it is imperative that the curing procedures and the age at time of testing be clearly specified.
Test voltage may be aetm 10 to 60 V, and test duration may be from 6 to 96 h. The PR cell is the standard cell. The cells are supplied with PRB gaskets, unless axtm specified. These notes and footnotes excluding those in asrm and figures shall not be considered as requirements of the standard.
After the test is completed, the specimen is split, and the chloride ion penetration is measured by spraying the split surface with c2102 0. The PR is supplied with cooling fins, which are needed if the temperature is required to be kept constant, as for example, for chloride ion migration testing using the NT Build test method. Pointing with the mouse cursor on any of menu items will produce a pop -out window with explanatory notes for that item.
Also shown is the relationship between the charge passed and the 5-minute electrical conductivity measured by the ASTM C test. Other specimen diameters may be tested with appropriate changes in the applied voltage cell design see 7.
First the cells are set up for a voltage of 30 V, the cells are turned on and the initial current is recorded.
Work Item s – proposed revisions of this standard. Specimens from 5 concrete mixtures were subjected to 59 days of standard curing and then subjected to 16 months of immersion in the NaCl solution.
The following plots aztm the correlations between various test results. The cell is sealed by tightening the four corner bolts, which squeezes the gaskets against the specimen. The following gaskets are available for different specimen diameters:. In this test, a water- saturated concrete specimen, nominally mm diameter and 50 mm thick, is positioned in a test cell right and pg. The negative terminal of the potential source is connected to the electrode in the the NaCl solution and the positive terminal is connected to the electrode in the NaOH solution.
The current is measured for 6 hours. This includes specimens with actual diameters ranging from 95 to mm. As was discussed on page 90, different ranges of bulk electrical conductivity correspond to different ranges of charge passed in accordance with ASTM C Based on the measured initial aztm, the test voltage and test duration are selected accordingly.
The average chloride penetration, the applied voltage, average temperature of the sodium hydroxide solution, test duration, and specimen thickness are used to calculate the non-steady-state migration coefficient. One approach to establishing criteria is discussed in Ref 6. It is important to maintain a constant temperature in the solutions in the reservoirs.
Data recorded during each test are stored in a database allowing a complete review of data if anomalous results are encountered.
A separate program is used for this test. Most concretes, if properly cured, become progressively and significantly less permeable with time. Link to Active This link will always route to the current Active version of the standard.