How do you determine the thermal conductivity of asphalt cement?
The equation we have used for thermal conductivity is: K = (0.813/d)*(1-(0.0003*(t-32))) d is the specific gravity at 60F/60F t is the temperature in F K is the thermal conductivity (BTU-in)/(hour-ft2-F)This information comes from page 870 of Asphalts and Allied Substances, 4th Edition, by Herbert Abraham (published in 1938).
What is the vapor pressure of asphalt at typical storage temperatures?
It is estimated that at a typical inventory temperature of 325°F, the vapor pressure of petroleum asphalt is less than 0.01 psia (1.5e-3 kPa).
What is the typical thermal BTU value for a pound of asphalt?
BTU varies by temperature and per cent mineral matter in the asphalt. A range is usually quoted, but we have used approximately 158,500 BTU/gal. This value is an average for an AC-10 grade. Most refineries will have a calorimeter somewhere in the lab that is used to run this test. Each company should run its […]
What is a typical value for the specific heat of asphalt cement?
The conventional method for determining specific heat for asphalt is listed as follows: c = (0.388 + 0.00045*T)/(d 0.5 ) c = specific heat in BTU per pound per °F or calories per gram per °C d = specific gravity of the asphalt at 60/60°F T = temperature, F A typical value for specific heat […]
How can I learn more about polyphosphoric acid modification of asphalt?
Two excellent resources: Our publication IS-220, Polyphosphoric Acid Modification of Asphalt. You can order off our website. A workshop on Polyphosphoric Acid Modification of Asphalt Binders was conducted in Minneapolis, MN on April 7-8, 2009. This workshop was jointly sponsored by the Transportation Research Board (TRB), Federal Highway Administration, Minnesota Department of Transportation, TERRA, Association […]
Does a laboratory need to be certified? What is the value of lab certification?
Standards are published so that testing laboratories know the proper procedures to follow in characterizing materials. For example, consider an 85-100 Pen bitumen in ASTM D946. When a testing laboratory states that a bitumen meets an 85-100 Pen grade the laboratory is confirming that it performed the tests according to the procedures in ASTM D946 […]