AASHTO T 137-12-ASTM C185-08

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Standard Method of Test for

Air Content of Hydraulic

Cement Mortar

AASHTO Designation: T 137-12

ASTM Designation: C185-08

American Association of State Highway and Transportation Officials

444 North Capitol Street N.W., Suite 249

Washington, D.C. 20001

TS-3a T 137-1 AASHTO

Standard Method of Test for

Air Content of Hydraulic Cement Mortar

AASHTO Designation: T 137-12

ASTM Designation: C185-08

1. SCOPE

1.1. This test method covers the determination of the air content of hydraulic cement mortar under the

conditions hereinafter specified.

1.2. The values stated in SI units are to be regarded as the standard.

1.3. Values in SI shall be obtained by measurement in SI units or by appropriate conversion, using the

Rules for Conversion and Rounding in IEEE/ASTM SI10, of measurements made in other units.

1.4. 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.

Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to

skin and tissue upon prolonged exposure.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:

 M 85, Portland Cement

 M 152M/M 152, Flow Table for Use in Tests of Hydraulic Cement

 M 240M/M 240, Blended Hydraulic Cement

 T 106M/T 106, Compressive Strength of Hydraulic Cement Mortar (Using 50-mm or 2-in.

Cube Specimens)

 T 127, Sampling and Amount of Testing of Hydraulic Cement

 T 162, Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency

2.2. ASTM Standards:

 C91/C91M, Standard Specification for Masonry Cement

 C778, Standard Specification for Standard Sand

 C1005, Standard Specification for Reference Masses and Devices for Determining Mass and

Volume for Use in the Physical Testing of Hydraulic Cements

 E438, Standard Specification for Glasses in Laboratory Apparatus

 E694, Standard Specification for Laboratory Glass Volumetric Apparatus

2.3. IEEE/ASTM Standard:

 SI10, American National Standard for Metric Practice

TS-3a T 137-2 AASHTO

3. SUMMARY OF TEST METHOD

3.1. Prepare a mortar with standard sand and the cement to be tested using a water content sufficient to

give a required flow. Compact the mortar into a measure of known volume and determine mass.

Calculate the air content from the measured density of the mortar, the known densities of the

constituents, and the mixture proportions.

4. SIGNIFICANCE AND USE

4.1. The purpose of this test method is to determine whether the hydraulic cement under test meets the

air-entraining or non–air-entraining requirements of the applicable hydraulic cement specification

for which the test is being made. The air content of concrete is influenced by many factors other

than the potential of the cement for air entrainment.

5. APPARATUS

5.1. Flow Table, Flow Mold, and Caliper—Conforming to the requirements of M 152M/M 152.

5.2. Measure—A cylindrical measure having an inside diameter of 76 ± 2 mm and a depth

(approximately 88 mm) adjusted by standardization with water to contain 400 ± 1 mL at 23.0 ±

2.0°C (see Note 1). For the purposes of this test, the capacity of the measure in milliliters is the

mass of the water content of the measure, in grams, divided by 0.9976, no correction in mass

being made for the buoyant effect of air. The measure shall have a uniform wall thickness. The

thickness of the wall and bottom shall not be less than 2.9 mm. The total mass of the empty

measure shall not be more than 900 g. The measure shall be made of a metal not attacked by the

cement mortar.

Note 1—The 400-mL measure can be calibrated readily by filling with distilled water at 23.0 ±

2.0°C to a point where the meniscus extends appreciably above the top of the measure, placing a

clean piece of plate glass on the top of the measure, and allowing the excess water to be squeezed

out. The absence of air bubbles as seen through the glass ensures the measure is completely full.

Care shall be taken that the excess water is wiped from the sides of the container before

determining the mass.

5.3. Mixer, Bowl, and Paddle—Conforming to the apparatus section of T 162.

5.4. Straightedge—A steel straightedge not less than 200 mm long and not less than 1.5 mm or more

than 3.5 mm in thickness.

5.5. Standard Masses and Balances—Conforming to the requirements of ASTM C1005. The balance

device shall be evaluated for precision and accuracy at a total load of 2 kg.

5.6. Glass Graduates—Glass graduates of 250-mL capacity, conforming to the requirements of

ASTM E438 and ASTM E694.

5.7. Tamper—In accordance with T 106M/T 106. The tamping face of the tamper shall be flat and at

right angles to the length of the tamper.

5.8. Tapping Stick—A piece of hard wood having a diameter of approximately 16 mm and a length of

approximately 152 mm.

5.9. Spoon—A metal restaurant-type serving spoon not less than 230 mm in length and with a bowl

approximately 100 mm in length.

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摘要：

This document provides a comprehensive overview of the joint standard AASHTO T 137-12 and ASTM C185-08, which specify the standard test method for measuring the air content of hydraulic cement mortar by the gravimetric or volumetric procedure. This e

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AASHTO T 137-12-ASTM C185-08

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