Asphalt, properties

Asphalt Roofing Components. Asphalt (qv) is a unique building material which occurs both naturally and as a by-product of cmde-oil refining. Because the chemical composition of cmde oils differs from source to source, the physical properties of asphalts derived from various cmdes also differ. However, these properties can be tailored by further ptocessiag to fit the appHcation for which the asphalt will be used. Softening poiat, ductility, flash poiat, and viscosity—temperature relationship are only a few of the asphalt properties that ate important ia the fabricatioa of roofing products. 

J. L. Goodrich, "Asphalt and Polymer-Modified Asphalt Properties Related to the Performance of Asphalt Concrete Mixes," Msphalt Paving... 

The acid number is a measure of the acidity of a product and is used as a guide in the quality control of resid or asphalt properties. Since a variety of oxidation products contribute to the acid number, and the organic acids vary widely in service properties, so the test is not sufficiently accurate to predict the precise behavior of asphalt in service. 

A study of MW distribution for precipitated asphaltenes and the derivation of conclusions about bitumen or asphalt properties from it has severe limitations since this complex mixture exhibits a considerable overlap of GPC curves for all the fractions obtained in a conventional separation procedure. Similarly, the resins separated on clay and the eluted hydrocarbons exhibit overlap, as shown by Figures 5 and 6. Figure 5 demonstrates the GPC profiles of Athabasca asphaltenes (nC5) and resins (Attapulgus clay—total resin eluent)... 

The former may be more supportable than the latter. If a proper quantity of an appropriate plastic is dissolved in an asphalt, properties of the asphalt will be modified to become more suitable for road paving. Maybe, there are some sorts of appropriate plastics like that in the wastes. However, the proportion of the appropriate plastics to the all waste plastics will is not high. The optimum volume of the plastics dissolved in the asphalt to modify properties of the asphalt is not high too. Therefore, the former utilization does not spend much waste plastics and it is not a effective way for the plastics waste reduction. 

The acid number is a measure of the acidity of a product and is used as a guide in the quality control of asphalt properties. Because a variety of... 

Table 15.2. Selected Tests for Determining Asphalt Properties...

Another method (ASTM D-893) covers the determination of pentane-and toluene-insoluble constituents in used lubricating oils and can be applied to asphalt. Pentane-insoluble constituents include oil-insoluble materials, and toluene-insoluble constituents can come from external contamination and highly carbonized materials from degradation. A significant change in pentane- or toluene=insoluble constituents indicates a change in asphalt properties that could lead to problems in service. The insoluble constituents measured can also assist in evaluating the performance characteristics of asphalt. 

The use of blending GRT with asphalt has been in existence for quite some time. Depending on the type of tire, the composition of GRT may include different rubbers. These crosslinked rubbers are mostly immiscible in bitumen. The blends show an improvement in basic asphalt properties as well as rubberlike characteristics. The blend is thought of as a dispersion of undissolved swollen rubber particles acting as an elastic aggregate within asphalt, modified by the portion of the rubber particles that have dissolved. 

Chem. Descrip. Specialty emulsion Uses Elastomeric emulsion in industrial and architectural coatings Features Exc. alkali/water resist., adhesion to asphalt Properties Vise. 500 cps acid no. < 5 pH 5 55% NV Elastorez IC-2501 [MeadWestvaco]... 

The use of propane asphalt as a briquette binder has also been investigated propane asphalt is the propane-insoluble portion of petroleum residua (Speight, 1991). The asphalt has a lower penetration value than asphalts obtained by distillation or by oxidation. Propane asphalt has a relatively high temperature sensitivity, which may cause the briquettes to stick together. It is possible to alter the temperature sensitivity of the propane asphalt by the conventional methods of treatment that are used to alter asphalt properties for highway use (Speight, 1991,1992). 

Density — Sulfur — Mercaptans — Octane — FIONA — Chromatography — Density — Sulfur — Viscosity — Cetane — Cold properties — Aniline — Aromatics — Nitrogen — Density — Sulfur — Viscosity — Refractive Index — Cold properties — Aniline — Nitrogen — Metals — Asphaltenes — Carbon residue — Density — Sulfur — Viscosity — Carbon residue — Cold properties — Metals — Asphaltenes — Asphalt properties ... 

Total distillate yield is set by analysis of the portion of the crude assay covering asphalt properties. From Fig-... 

Uses Corrosion inhibitors emulsifiers intermediates for corrosion inhibitors emulsifiers for asphalt Properties Liq. 100% cone. 

Chem. Descrip. Alkyl diamine Ionic Nature Cationic Uses Emulsifier for asphalt Properties Brn. liq. 100% cone. 

Uses Dispersant in aq. systems suspending agent air-entraining agent, dispersant, mold release agent, emulsifier for asphalt Properties Powd. sp.gr. 0.5 (2% aq ) pH 7.0 94% act. 

---