Asphalt molten

Heavy organics have viscosities in the range 5-100 cP, cold gas oil. lube oils, heavy and reduced crudes, etc. Very heavy organics have viscosities above 100 cP. asphalts, molten polymers, greases, etc. 

Very heavy organics have viscosities above 100 cP, asphalts, molten polymers, greases, etc. ... 

Sulfur can replace 30-50% of the asphalt in the hlends used for road construction. Road surfaces made from asphalt-sulfur hlends have nearly double the strength of conventional pavement, and it has been claimed that such roads are more resistant to climatic conditions. The impregnation of concrete with molten sulfur is another potential large sulfur use. Concretes impregnated with sulfur have better tensile strength and corrosion resistance than conventional concretes. Sulfur is also used to produce phosphorous pentasulfide, a precursor for zinc dithiophosphates used as corrosion inhibitors. 

Gulf Canada Limited (20, 2T). The process developed by Gulf consists of a pumping system wfnch continuously delivers measured volumes of sulfur and asphalt to a mixing device which disperses the molten sulfur in the liquid asphalt. The composition of the emulsion is typically in the range 25-60 parts sulfur to 75-40 parts asphalt. The temperatures of the sulfur, asphalt and S/A emulsion are maintained in the ranges 121-154 C, 121-177 C, and 121-154 C, respectively. 

The emulsification is carried out in such a manner that part of the sulfur is dissolved in the asphalt and the remainder is dispersed in the continuous asphalt phase as molten sulfur droplets with a particle size range of 1-50 vm. 

The emulsifying equipment has been set up as a self-contained trailer-mounted unit. The unit used at the 1975 field trial in Lufkin, Texas is designed to accept molten sulfur and hot asphalt from road tankers. The sulfur and asphalt flow rates are controlled by two proportioning pumps driven by a sprocket and chain arrangement from a common shaft. This arrangement enables the sulfur content of the binder to be varied from 20% to 50%. 

Once mixed, the material can be handled using any equipment suitable for asphalt mixtures. As consistency can be varied from the equivalent of zero slump concrete to that of a sloppy mortar, the molten mix can be used for precast, slip-formed, extended or poured-in-place applications. 

Disperse the Acritamer 941 meen C-25 one at a time. Mix. asphalt to B5C. When both are molten asphalt into the water rate of addition should be no sion. Mix until uniform. Shock water jacket. 

This molten calcium silicate and the other more readily fusible silicates that are always present in the crude iron ores form a slag which floats on the surface of the molten iron. The slag is removed, allowed to solidify, and used in the manufacture of cement or as a road-building material after being mixed with asphalt or road tar. 

Emulsification Method. Emulsified sulfur-asphalt binder was prepared by combining molten sulfur and liquid asphalt in a 2Vi -in.-diameter, vertical, Gifford Wood colloid mill (1) at a rotor-stator gap setting of... 

The earliest cast, composite binder was studied by Jet Propulsion Laboratories (JPL) and made use of molten asphalt (7). This material was heated until it formed a fluid melt, was mixed with oxidant, and the heated mixture cast into a motor cavity and allowed to cool. This system was poor because of the limited temperature range, the low solids content which could be formulated, and the poor mechanical properties of highly loaded asphalt. A chemically cured system was then introduced when acrylate monomers were mixed with oxidizer and curative (8). The mixture eould be cast, heated to cure temperature, and the acrylate polymerized to give a well consolidated grain. The basic deficiencies encountered... 

It has been proved that pyranyl foams can be used for pour-in-place applications in household refrigerators and deep freezers. Furthermore, because of their high thermal stability the foams can withstand inunersion in molten asphalt at 205°C (400°Q. This jn-operty makes possible applications to roof insulation with molten asphalt as a water-I otecting layer. Another possible application is the baking of the enamel finish on freezer cabinets after the foam insulation has been applied. The foaming reaction is very fast, and, therefore, spraying of the foams onto out-door tanks and pipes is possible. 

The lap-shear test was used to determine the room-temperature cohesive strength of the modified asphalts and to follow the thickening process in both air and water. Two aluminum strips 1 mm thick and 2.5 cm wide were overlapped 2.5 cm and firmly bonded together with a drop of molten asphalt. The test pieces were held in this position with alligator clips until ready for shear testing. In a few experiments pieces of traprock were polished and similarly bonded together as shown in... 

Adding enough molten sulfur to hot aggregate—asphalt mix increases its fluidity and produces a mix which can be molded or shaped. Casting these mixes requires little or no consolidation effort, and, specifically with pavements, rolling is not required. It has been demonstrated by micro-... 

A preheated mixing bowl was filled with a measured amount of preheated sand. Then the required amount of hot asphalt was weighed into the bowl with the sand and mixed thoroughly with a mechanical mixer for a predetermined period. This was followed by a second wet mix cycle using the molten sulfur. Each batch of mix contained enough material (approximately 8 lb) to prepare three test specimens. 

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