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Table I -- Estimated raw-material components of concrete pipe- and <br /> prestressed-concrete products <br /> <br /> Type of Concrete Product <br /> <br />Raw-Material Concrete Prestressed <br />Component Pipe Beams <br /> <br />"Rock"+ 40.7 39.8 <br />Sand 37.8 38.1 <br />Cement 17.3 17.3 <br />Water 4.54 4.54 <br />Additives* 0.07 0.16 <br />Air -- 0.006 <br /> 100.41 99.90 <br /> <br />Organic admixtures <br />"Rock" is of carbonate sedimentary <br />and crystalline rock~. <br /> <br />8803 25 <br /> <br />R.K. Hoagberg Associates, Inc. <br />Consulting Geologists <br /> <br /> <br />