Asphalt emulsion binder

Table 2. Properties of Recycled Asphalt Pavement Using Sulfur/ Asphalt Emulsion Binder.

Saylak, D., Gallaway, . M. and Noel, J. S., "Evaluation of a Sulfur-Asphalt Emulsion Binder Systems for Road Building Purposes", Final Report, Texas A M Research Project - RF 3146, January, 1976. 

Saylak, D., et al., Evaluation of Sulfur-Asphalt Emulsion Binder System... 

Non-sulfonated lignins find utility as emulsifiers and stabilizers in water-based asphalt emulsions, as coreactants in phenolic binder applications, as negative plate expanders in lead acid storage batteries, as protein coagulants in fat rendering, and as flocculants in waste water systems. 

Reduction in AC usage - Stable sulphur asphalt emulsions can be produced with up to 40%/wt. sulphur. Since binder volume is the critical factor in the paving mix, and since the relative density of the emulsion binder is greater than regular AC, the substitution of AC by sulphur is not a one-to-one relationship. With a 40 60 emulsion, AC usage is reduced by approximately 27%/wt. This can provide a significant cost saving as well as a lesser dependence on not-always reliable asphalt supplies. 

The manufacture of sulphur extended asphalt paving mixes is relatively straightforward. Except for production of the emulsion binder itself, no mechanical change is required in the paving plant and normal procedures are followed. 

Rennie, W. J., "Sulphur Asphalts The Pronk S/A Emulsion Binder System", SUDIC, New Uses for Sulphur, 1978, 3. 

Use Stabilization of asphalt emulsions, ceramic binder and deflocculant, dye leveler and dispersant, drilling-fluid additive, precipitation of proteins, extender for phenolic plastics, special molded products, source of vanillin, phenol, and of a component of battery expanders. 

The incorporation of sulfur in asphalt emulsions also shows great potential. Although further improvements in the insulating value of asphalt might be expected by adding sulfur, such binders have other advantages over normal asphalt. In 1972 Pronk (9) produced sulfur asphalt emulsion mixes in the laboratory. More recently, Societe Nationale des Petroles d Aquitaine (SNPA) (10) reported the results of an extensive laboratory and field study using sulfur in an asphalt emulsion. Both Pronk and SNPA have shown that temperature-viscosity relationships are improved, as are Marshall stability and flow values. 

The cold asphalts and the binder, which, in all cases, is bitumen emulsion, should be designed based on and meet the requirements of the asphalt emulsion manual (Asphalt Institute 2008). 

Uses Dispersant for textile dyestuffs, cements, ceramics, pigments, oil drilling muds, pesticides, leather tanning binder for coal briquettes, ceramics, carbon bik., fertilizers, herbicides, dust suppressants, plywood, feed pellets, soil stabilizers sequestrant for micronutrient systems, cleaning compds., water treatments for boiling and cooling systems emulsifier for asphalt emulsions, pigments and dyes, pesticides, wax emulsions... 

The need for an appropriate residue recovery procedure for asphalt emulsion has been recognized in both Europe and the US. The forced airflow drying method, which dries the emulsion at ambient temperature, provides a sufficient amount of residue samples within 3-5 h for the Superpave binder characterization [22]. An example of estimating the mtting resistance temperature, (temperature at G /sin(5) = 1 kPa) of microsurfacing emulsion residue is shown in Fig. 12-16. A typ-... 

Sulfur-asphalt binders can be prepared by various mechanical means. One conventional method is to combine liquid sulfur and asphalt at 285°-300°F in a Gifford Wood colloid mill. A rotor stator gap setting of 0.02 in. at 7000 rpm for 8 min will prepare satisfactory emulsions. This emulsion is immediately mixed with preheated aggregate. The laboratory binder was prepared by TTI (Texas Transportation Institute) scientists in cooperation with SNPA (Societe Nationale des Petroles d Aquitaine) scientists and is believed to be comparable with the binders prepared by the turbine in the field trials. The need for dispersing sulfur in the asphalt is discussed by Garrigues (9) and by Kennepohl et al., Deme, and McBee et al. elsewhere in this volume. 

One application area between 1962 and 1979 that has an impact on today s problems is the manufacture of wallboard. Wallboard was prepared by sandwiching a gypsum mixture between heavy papers. A typical core consists of gypsum, starch, potash, a pulp slurry, an asphalt or rosin-size emulsion, and gauging water (i.e., a colloidal silica plus polymer binder system). The mixture is blended together and placed between liners made on linerboard machines. 

Emulsions can be prepared with modified standard types of turbines. After appropriate adjustment, S/A binders of the desired quality are produced with an acceptable output/power consumption ratio. This laboratory has produced most of the binders described in the present paper, using the basic parts of a Moritz BF 50 turbine at 140°C for 5 mins, having first checked that this process incurred no risk of asphalt dehydrogenation. 

Preparation of the S/A Binders. The main difficulties arose from the poor thermal insulation of the pure sulfur circuits. Once these problems had been overcome, S/A binder was produced at a rate of 6 tons/hr. The emulsion had the correct sulfur content and satisfactory dispersion. Process parameters were sulfur temperature, 140°C pen. 40/50 asphalt temperature, 155-160°C. 

Cold asphalts are bituminous mixtures in which the binder material is bituminous emulsion. This chapter does not cover cold asphalts produced with cut-back or flushed bitumen. 

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