The purpose of this study was to develop information from which vermiculite concrete can be evaluated as a shock-isolating material. The study consisted of a literature survey, an exploratory phase, an experimental phase, a cost analysis, the development of two mix design methods, and the determination of field tests necessary for construction controls.nAlthough the results indicate that the air content and cement-to aggregate ratio significantly affect the energy-absorbing characteristics of vermiculite concrete, the age and degree of saturation do not appear to be significant factors. The cost of materials in bulk quantities for vermiculite concrete was estimated to be from $9 to $13 per cubic yard, depending upon the air content and cement-to-aggregate ratio of the concrete.nTwo 'methods of mix design were developed from which the first trial mix proportions of vermiculite concrete with preselected char acteristics could be determined. A mixing procedure recommended by the Vermiculite-Institute was field tested and was found-to be satisfactory.nFor large-scale pumping operations, it was recommended that air content, wet unit weight, and slump measurements be taken periodically to insure that vermiculite concrete with preselected shock isolating characteristics would be produced.
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