MATERIALS Pavement Core Samples COAL TAR AND ASPHALT CEMENT SAMPLES METHODS OF ANALYSIS Binder Content PAH Analysis Analysis of Phenols Modified Ames Assay RESULTS Coal Tar and Asphalt Cement Core Sample Analyses COMPARISON OF CORE SAMPLES WITH U.S. AND EUROPEAN ASPHALT AND COAL TARS COMPARISON OF DIN METHOD FOR PHENOLS WITH THE CORE SAMPLES COMPARISON OF MODIFIED AMES TEST RESULTS DISCUSSION C...

I t has been recognized for some time that it is necessary to subdivide colloids into two groups, the hydrop~lic and the hydrophobic colloids, according to the influence of electrolytes on their precipitation. To the hydrophilic colloids belong among others proteins and soaps, and to the hydrophobic colloids, collodion, mastic, graphite, metal oxides, etc. The hydrophobic colloids (such as mast...

The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data herein. The contents do not necessarily reflect the official views or policies of the Indiana Department of Transportation or the Federal Highway Administration at the time of publication. This report does not constitute a standard, specification or regulation. Adequate f...

BACKGROUND This study aimed to compare the burst strength of suture closure versus the use of suture and strip together. METHODS On cadavers, 50 skin incisions were closed as follows: group 1--subcuticular continuous suture; group 2--same suturing with placement of strips; group 3--same as group 2 except gum mastic was applied prior to strips; group 4--strips alone; and group 5--strips with g...