Paper 1: Results of a statewide experiment to compare the AE-55 air indicator for concrete with conventional pressure methods are presented. Paper 2: Describes a series of tests designed to determine the reliability of results, the feasibility of use, and the practical applications of the test hammer in construction control. Paper 4: In this study, pore characteristics, mineralogy, texture, and structure were determined for cherts and shales from nine Indiana glacial gravel deposits by means of microscopic petrography, x-ray diffraction, and the common specific gravity and absorption techniques.