Emulsified asphalts

Emulsified asphalt used as a protective coating is specified by ASTM D1227 (10). These emulsions ate appHed above freezing by bmsh, mop, or spray, and bond to either damp or dry surfaces. Such appHcation is not recommended for inclines <4° to avoid the accumulation of water. However, curing by water evaporation can be slow, and these emulsions may remain water-susceptible. 

ASTM D1227, Emulsified Asphalt Used as a Protective Coating for Roofing, ASTM, Philadelphia, Pa. 

Only those grades of emulsified asphalt in general use have been indicated herein. It is possible that under certain variation of aggregates and/or climatic conditions, additional selections might be appropriate. Where the use of emulsified asphalt for appHcations other than those Hsted in the table are contemplated, the emulsion suppHer should be consulted. 

Asphalt Manufacture Saleable asphalts are produced from the residua of selected crudes. The residuum itself may be sold as straight reduced cuts to make it easier to handle, producing the so called cut-back asphalts. Another variation is air blown or oxidized asphalts for improved tenacity, greater resistance to weathering, and decreased brittleness. Emulsified asphalts are made for application at relatively low temperatures. 

Asphalt concrete is primarily used as a structural pavement surface constructed over a subgrade and a subbase. It is designed to support the traffic load and distribute the load over the roadbed. Asphalt concrete pavements can be constructed using hot mix or cold mix asphalt. Hot mix asphalt is a mixture of tine and coarse aggregate with asphalt cement binder that is mixed, placed, and compacted in a heated condition. Cold mix asphalt is a mixture of emulsified asphalt and aggregate, produced, placed, and compacted at ambient air temperature. Cold mix asphalt pavement usually requires an overlay of hot mix asphalt or surface treatment to resist traffic action. 

D 3747 Specification for Emulsified Asphalt Adhesive for Adhering Roof Insulation... 

Two types of asphalt were used blown asphalt and emulsified asphalt. Blown asphalt is asphalt stock that has been heated at temperatures from 200°-300°C and had air blown through it. The process is one of dehydrogenation and polymerization, resulting in a product that is thermally more stable. We used a blown asphalt provided by the Exxon Corp. because it most closely resembles Mexphalt R 90/40 (Shell Oil Co.), the blown asphalt used most in Europe. Mexphalt R 90/40 is not available in the U.S., but differs chiefly in being somewhat softer than the asphalt from the Exxon Corp. 

Emulsified asphalt was also investigated. Type RS-2 was chosen, as this type is common and has been tested at Oak Ridge (9). Our material was 69% asphalt, 28% water, and 3% tall oil. Even after evaporation of the water, the material is still much softer than blown asphalt, as shown in Figure 6. 

Blown asphalt is more stable mechanically, but requires higher operating temperatures than emulsified asphalt. Currently, blown asphalt is the favorite for waste fixation purposes in countries using this method. 

Laboratory Development of a Process for the Incorporation of Radioactive Waste Solutions and Slurries in Emulsified Asphalt, USAEC Report ORNL-4003, Union Carbide Corp., Oak Ridge National Laboratory, Oak Ridge, Tenn., July, 1967. 

Emulsified Asphalts (ASTM D244). This standard covers a variety of tests for the composition, handling, nature and classification, storage, use, and specifying of asphalt emulsions used primarily for paving purposes. 

Road base. Another approach to the use of ground scrap rubber as a road building component was reported [6] by blending equal volumes of ground scrap rnbber, sand, and emulsified asphalt. 

Puzinauskas, V. P. and Jester, R. N., Design of emulsified asphalt paving mixtures, National Cooperative Highway Research Program Report 259, Transportation Research Board, Washington, DC, 1983. 

Amine ethoxylates are found in a wide variety of applications as corrosion inhibitors (oilfield applications), emulsifiers (asphalts), and as wetting agents processing aids, antistatic agents and lubricants (textiles). 

Table 3.15 Types and requirements for cationic emulsified asphalt ...

Source Reprinted from ASTM D 2397, Standard specification fi>r cationic emulsified asphalt. West Conshohocken, Pennsylvania, USiASTM International, 2012. With permission ( ASTM International). 

AASHTO M 140. 2013. Emulsified asphalt. Washington, DC American Association of State Highway and Transportation Officials. 

ASTM D 244.2009. Standard test methods and practices for emulsified asphalts. West Conshohocken, PA ASTM International. 

ASTM D 977-12b. 2012. Standard specification for emulsified asphalt. West Conshohocken, PA ASTM... 

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