Standard Method of Test for Float Test for Bituminous Materials

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Standard Method of Test for

Float Test for Bituminous Materials

AASHTO Designation: T 50-22

Technically Revised: 2022

Technical Subcommittee: 2a, Emulsified Asphalts ASTM Designation: D139-16

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TS-2a T 50-1 AASHTO

Standard Method of Test for

Float Test for Bituminous Materials

AASHTO Designation: T 50-22

Technically Revised: 2022

Technical Subcommittee: 2a, Emulsified Asphalts ASTM Designation: D139-16

AASHTO T 50-22 is identical to ASTM D139-16 except as follows:

1. Insert a new section immediately before Section 2.1 to contain the following:

All references to the ASTM standards listed in the following table shall be replaced with the corresponding AASHTO standard.

Referenced Standards

ASTM AASHTO

D244 T 59

D6997 T 59

2. Add references in Section 2 for AASHTO standards.

 M 339M/M 339, Thermometers Used in the Testing of Construction Materials 3. Add references in Section 2 for ASTM standards.

 E1, Standard Specification for ASTM Liquid‐in‐Glass Thermometers

 E230/E230M, Standard Specification for Temperature‐Electromotive Force (emf) Tables for Standardized Thermocouples

 E879, Standard Specification for Thermistor Sensors for General Purpose and Laboratory Temperature Measurements

 E1137/E1137M, Standard Specification for Industrial Platinum Resistance Thermometers

 E2877, Standard Guide for Digital Contact Thermometers

4. Add references in Section 2 for International Electrotechnical Commission standards.

 IEC 60584‐1:2013 Thermocouples ‐ Part 1: EMF Specifications and Tolerances

 IEC 60751:2008 Industrial Platinum Resistance Thermometers and Platinum Temperature Sensors

5. Delete references in Section 2 for IEC 60854 standard which is a typo citing Pulse-Echo equipment but meant to reference thermocouples as noted in IEC 60584.

6. Revise Section 5.4 to address the multiple thermometer needs as follows:

5.4 Thermometers—Thermometers shall be used to measure temperature in the ranges of use and with accuracies as defined for each test parameter.

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TS-2a T 50-2 AASHTO 5.4.1 The thermometer for measuring the temperature of the water bath shall meet the

requirements of M 339M/M 339 with a temperature range of at least 0 to 80°C (32 to 176°F), and an accuracy of ±0.25°C (±0.45°F) (see Note 1).

Note 1—Thermometer types suitable for use include ASTM E1 mercury thermometers;

ASTM E879 thermistor thermometer; ASTM E1137/E1137M Pt-100 RTD platinum resistance thermometer, Class A; or IEC 60751: 2008 Pt-100 RTD platinum resistance thermometer, Class AA.

5.4.2 The thermometer for measuring the temperature of the water bath shall meet the requirements of M 339M/M 339 with a temperature range of at least 0 to 260°C (32 to 500°F), and an accuracy of ±1.0°C (±1.8°F) (see Note 2).

Note 2—Thermometer types suitable for use include ASTM E1 mercury thermometers;

ASTM E230/E230M thermocouple thermometer, Type T, Special Class; or IEC 60584 thermocouple thermometer, Type T, Class 1.

7. Add two new sentences at the end of Section 7.3 to contain the following:

The residue may also be poured from the still directly into a tin or small container that shall be maintained at the proper temperature for pouring. The temperature of the residue shall be verified during pouring by inserting the 30-AWG gauge thermocouple probe into the residue while it is poured out of the container into the collar.