AASHTO T 332:07(2020) Standard Method of Test for Determining Chloride lons in Concrete and Concrete Materials by Specific lon Probe.
6.2. Bit—A vacuum bit with a diameter equivalent to 1.5 times the maximum aggregate size in the concrete is used. A 28-mm (1.25-in.) hit size is recommended for a maximum coarse aggregate size of 19 mm (0.75 in.). The bit grinds the concrete to a fineness of 99 percent passing the 850-.tm (No. 20) sieve conforming to ASTM Eli. The finely ground powder is drawn into the collection unit through a coaxial hole in the hit.
6.3. Sample collection Unit—A cylindrical polyrnethyl methacrylate vacuum chamber is connected to the carbide bit through a vacuum hose for sample collection. Vacuum is provided by a 2.25-HP wet/dry shop vacuum unit. Figures 4 through 8 present the details of the sample collection unit that is to be attached to the wet/dry shop vacuum unit.
6.4. Filter—An inexpensive coffee filter is adequate for collecting the powdered concrete samples in the polymcthyl methacrylatc chamber.
6.5. Plastic Bottles/Containers—Widemouth polypropylene bottles with screw caps in the following two sizes are needed:
6.5.1. For calibration solutions and for storing powdered concrete samples: 30 mL.
6.5.2. For digestion solution: 125 mL.
6.6. Weighing Papers—76 by 76 mm (3 by 3 in.) weighing papers are needed for determining the mass of the powdered concrete samples.
6.7. Spatula—A stainless steel small spoon spatula is needed for transferring small quantities of the powdered concrete samples from the plastic container for mass determinations.
6.8. Balances—An electronic balance sensitive to 0.1 g is needed to determine the mass of the specimens. An electronic balance sensitive to 0.0001 g is needed to determine the mass of sodium chloride for the calibration and stabilizing solutions.
6.9.3. Reproducibility shall be ±2 percenL
6.9.4. Operating temperature range shall be 10 to 100°C by thermometers specified in ASTM El. Note 1—A suitable specific chloride ion electrode is the Orion Combination Chloride Electrode Model 96-I 7B with chamber tilling solution number 90(X)1 7 (for use with chloride solution concentrations up to 355 mg/L).
6.10. Multhneier—The multimeter used in the procedure must conform to the following specifications:
6.10.1. Maximum common mode voltage shall be 1500 VDC or peak AC.AASHTO T 332 pdf download.