AASHTO TP 138-20 pdf free download
AASHTO TP 138-20 pdf free download.Weight and Diameter for Carbon-Steel for Steel Wire and Welded Wire Reinforcement for Concrete.
1. SCOPE 1.1. This test method covers procedures for determining the unit weight and diameter of steel wire and welded wire reinforcement, plain and deformed, for conformance with M 336M/M 336. A representative specimen of wire is tested to determine its diameter and/or unit weight. The tests herein described are used to determine the minimum properties of the wire in the product manufacturing specifications where indicated. Variations in testing methods are to be avoided and standard methods of testing are to be followed to obtain reproducible and comparable results. 1.2. The results determined by this test method shall be expressed in inch-pound units except as indicated. 1.3. This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. 2. REFERENCED STANDARDS 2.1. AASHTO Standard: ■M 336M/M 336, Steel Wire and Welded Wire, Plain and Deformed, for Concrete Reinforcement 2.2. ASTM Standard: ■E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications 3. SIGNIFICANCE AND USE 3.1. This test method provides a standard method for determining the unit weight of deformed wire and diameter of plain wire for comparison with specification requirements.4. SAMPLING 4.1. Test specimens for testing weight and/or diameter properties of plain and deformed wire shall be full wire sections obtained from ends of wire coils or during the manufacturing for wire or from finished welded wire reinforcement sheets or rolls. Specimens taken for weight shall not contain any weld. The specimens shall be of sufficient length to perform testing described herein. 4.2. Test specimens for testing weight and/or diameter properties of plain and deformed welded wire reinforcement shall be obtained by cutting from the finished welded wire reinforcement a full width section of sufficient length to perform testing described herein. 5. DEFORMED, CONCRETE REINFORCEMENT UNIT WEIGHT PROCEDURE 5.1. Straighten test specimens and ensure that the samples are of sufficient length for accurate measurements. Note 1- Sample length from welded wire reinforcement is dependent on sheet spacings, which can range from 2 by 2 to various by various. 5.2. Square each end of the wire specimen using a grinding wheel or any other suitable means to ensure that the length measurement is accurate. 5.3. Determine the length of the specimen using a calibrated/verified caliper or metal rule to the nearest 0.001 in. 5.4. Place the specimen on a scale and record the weight in grams to the nearest 0.001 lb. 5.5. Determine the weight of the specimens to the nearest 0.001 lb/ft.8.1.1. Repeatability– Two test results obtained within one laboratory shall be judged not equivalent if they differ by more than the r value for that material; r is the interval representing the critical difference between two test results for the same material, obtained by the same operator using the same equipment on the same day in the same laboratory. 8.1.2. Reproducibility- -Two test results shall be judged not equivalent if they differ by more than the R value for that material; R is the interval representing the difference between two test results for the same material, obtained by different operators using different equipment in different laboratories. 8.1.3. Any judgment in accordance with these two statements would have an approximate 95 percent probability of being correct. 8.2. Bias- At the time of the study, there was no accepted reference material suitable for determining the bias for this test method; therefore, no statement on bias is being made. 8.3. Precision- The precision statement was determined through statistical examination of one hundred and fifty-three results, from twenty-five laboratories, on two materials.AASHTO TP 138-20 pdf download.
