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|Bituminous and resinous materials for dust control
|Armour Industrial Chemical Company.
United States. Army Materiel Command.
Timmons, Robert D.
|U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Abstract: This report describes the laboratory investigation made to examine the effectiveness of selected materials, whose potential to satisfy the requirements set forth by the Department of the Army (DA) for a dust palliative were considered most desirable. The data reported herein does not include information that was obtained by the U.S. Army Engineer Waterways Experiment Station (WES) at Vicksburg, Miss. However, for purposes of clarity, reference will be made to some of the general data on samples that were considered for traffic testing by WES. This report includes all formulations that, on a laboratory level, met the criteria set by DA. Included are those formulations that indirectly contributed to and assisted in developing potential materials, and those that were rejected as not meeting the specifications. These basic systems were modified by altering the compounds to obtain the desired results: that is, little tack, reasonable elongation, water impermeability, and the ability in general to pass the standards set for an acceptable dust palliative. Of the systems evaluated, results indicated those which showed the most potential were the cationic resin-asphalt emulsions and the invert resin-asphalt cutback system. A formulation was developed using a cationic emulsifier that contained a blend of propane and vacuum-reduced asphalts along with neoprene rubber elastomer incorporated during manufacture. This product performed well when subjected to the air impingement, water erosion, and cure test. The invert cutback system that showed the highest potential was a propane asphalt-vinyl toluene blend. Although this product passed the laboratory phase testing well, field testing indicated that the elongation properties were inadequate. This formulation had rapid cure rates due to cross-linkage of the acid group attached to the propane asphalt and the acidified, water soluble, rapid-setting cationic emulsifier. This rapid curing characteristics should be studied more extensively in developing future systems.
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