AASHTO T 305-2014 Standard Method of Test for Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures.pdf
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1、Standard Method of Test for Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures AASHTO Designation: T 305-14 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-2c T 305-1 AASHTO Standard Method
2、of Test for Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures AASHTO Designation: T 305-14 1. SCOPE 1.1. This test method covers the determination of the amount of draindown material in an uncompacted asphalt mixture sample when the sample is held at elevated temperatures co
3、mparable to those encountered during the production, storage, transport, and placement of the mixture. The test is particularly applicable to mixtures such as porous asphalt (open-graded friction course) and Stone Matrix Asphalt (SMA). 1.2. The values stated in SI units are to be regarded as the sta
4、ndard. 1.3. This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine
5、 the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 92, Wire-Cloth Sieves for Testing Purposes R 47, Reducing Samples of Hot Mix Asphalt (HMA) to Testing Size T 245, Resistance to Plastic Flow of Asphalt Mixtures Using Marshall Apparatus T 255,
6、 Total Evaporable Moisture Content of Aggregate by Drying 3. TERMINOLOGY 3.1. Definitions: 3.1.1. draindown materialFor the purpose of this test method, draindown material is considered to be that portion of material that separates itself from the sample as a whole and is deposited outside the wire
7、basket during the test. The draindown material may be composed of either asphalt binder or a combination of asphalt binder and fine aggregate. 3.1.2. draindownThe process by which draindown material separates itself from the sample as a whole. 4. SUMMARY OF METHOD 4.1. A sample of the asphalt mixtur
8、e to be tested is prepared in the laboratory or obtained from field production. The sample is placed in a wire basket, which is positioned on a plate or other suitable container of known mass. The sample, basket, and plate or container are placed in a forced-draft 2015 by the American Association of
9、 State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2c T 305-2 AASHTO oven for 1 h at a preselected temperature. At the end of 1 h, the basket containing the sample is removed from the oven, along with the plate or container and the mass o
10、f the plate or container is determined. The amount of draindown material is then calculated. 5. SIGNIFICANCE AND USE 5.1. This test method can be used to determine whether the amount of draindown material measured for a given asphalt mixture is within acceptable levels. The test provides an evaluati
11、on of the draindown potential of an asphalt mixture during mixture design or during field production. This test is primarily used for mixtures with high coarse aggregate content such as porous asphalt (open-graded friction course) and SMA. 6. APPARATUS 6.1. Forced-Draft OvenCapable of maintaining th
12、e temperature in a range from 120 to 175C (250 to 350F). The oven should maintain the set temperature to within 2C (3.6F). 6.2. PlatesOr other suitable containers of appropriate size. The plates or containers used should be of appropriate durability to withstand the oven temperatures. Cake pans or p
13、ie tins are examples of suitable types of containers. 6.3. Standard BasketMeeting the dimensions shown in Figure 1. The basket shall be constructed using standard 6.3-mm (0.25-in.) sieve cloth as specified in M 92. 6.4. BalanceAccurate to 0.1 g. 6.5. Other apparatusSpatulas, trowels, bowls, and mixe
14、r as needed. 7. SAMPLE PREPARATION 7.1. Laboratory-Prepared Samples: 7.1.1. Number of SamplesFor each mixture tested, the draindown characteristics should be determined at two different temperatures. The two temperatures should be the anticipated plant production temperature, as well as 15C (27F) ab
15、ove that temperature (Note 1). For each temperature, duplicate samples should be tested. Thus for one asphalt mixture, a minimum of four samples will be tested. Note 1When using the test as part of the mixture design procedure, the test should be performed at two temperatures in order to determine t
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