SHRP-A-379 traducir

Standard Method of Test for
The Measurement of Initial Asphalt Adsorption
and Desorption in the Presence of Moisture
SHRP Designation: M-0011
1. SCOPE
1.1 This test method describes a procedure for assessing the ability of an asphalt
cement to adhere to the surface of the fine aggregate portion of an asphalt concrete mixture.
The strength of the initial adhesion of the asphalt cement to the aggregate in the presence of
moisture can also be assessed.
1.2 A sample of aggregate is exposed to a solution of asphalt cement in toluene at
room temperature (25°C). After an equilibrium period, the amount of asphalt cement that has
adsorbed on the aggregate is measured. Water is then introduced into the system, and it
displaces the asphalt cement adsorbed on the aggregate surface. After a period of time, the
amount of asphalt cement remaining on the aggregate is measured. This is the net adsorption
amount.
NOTE1.--This test methodmaynot be accuratefor modifiedasphaltbindersbecauseof potential
differences in toluene solubilityand absorbancewavelengthbetween the base asphalt cementand the modifier. Use of
the test method is recommended for unmodifiedasphalt binder-aggregatepairs only.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard may involve hazardous materials, operations, and equipment. This
standard does not purport to address all of the safety problems 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 DOCUMENTS
2.1 AASHTO Standard Method T40, Practicefor Sampling Bituminous Materials.
2.2 Toluene--Consult manufacturer's or vendor's Material Safety Data Sheet (MSDS)
for safety and handling precautions.
1Thisstandard is based on SHRP Product 1013.
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