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1 ) DESCRIPTION CEMENTED COQUINA SHELL BASE COURSE <br /> A) Under this item , the Contractor shall furnish all equipment , labor, materials , and transportation <br /> necessary to construct a Coquina shell base course upon the competed stabilized subgrade . The <br /> base course shall be constructed in accordance with the lines , grades , and typical section as <br /> shown on the Drawings . Unless otherwise noted construction shall conform to the provisions of <br /> Florida D . O . T. Standard Specifications for Road and Bridge Construction , Section 250 , 1986 <br /> Edition . <br /> 2) MATERIALS <br /> A) Coquina shell shall conform to the requirements of Florida D . O . T . Standard Specifications , 1986 <br /> Edition , Section 915 , and shall be from a source accept able to Florida D . O . T . The material shall <br /> have a minimum LBR value of 100 . Prior to placement , the material shall be crushed or broken to <br /> such a size that no less than 97 percent by weight will pass a 3 1 /2 inch sieve and no more than <br /> 20 percent dry weight shall wash through a No . 200 sieve . No visible clay or organic matter will <br /> be permitted . <br /> 3 ) PLACEMENT OF MATERIAL <br /> A) After the subgrade is completed and approved , the Contractor shall furnish and spread the <br /> coquina shell in a uniform distribution . Spread thickness shall be a minimum of 9 inches . <br /> Segregated areas of fine or course rock will not be permitted . Such areas shall be removed and <br /> replaced with properly graded rock. <br /> B ) After the spreading is completed , the entire surface shall be scarified and shaped so as to <br /> produce the required grade and cross section after compaction . <br /> 4 ) COMPACTION <br /> A) The required compaction of the coquina shell base course shall be a minimum of 98 percent of <br /> the maximum dry density . <br /> B) No less than 8- 10 ton steel drum or pneumatic tired roller shall be used to compact the base <br /> course . All depressions shall be filled and the process of rolling and filling shall continue until a <br /> thoroughly compacted uniform surface is produced . During final compaction operations , if <br /> blading of any area is necessary to obtain the true grade and cross section , the compaction <br /> operations for such areas shall be completed prior to making the field density compaction test on <br /> the finished base . <br /> C ) Should the subgrade material become mixed with the base course material at any time , the <br /> Contractor shall remove the mixture , reshape and recompact the subgrade, replace the materials <br /> removed with additional coquina shell and reshape and recompact the coquina shell base at no <br /> cost to the Owner. <br /> D) If cracks or checks appear in the base which would impair the structural integrity of the base in <br /> the opinion of the Engineer, the Contractor shall remove the cracks or checks by rescarifying , <br /> reshaping , refilling with coquina shell where necessary , and recompacting at no cost to the <br /> Owner . <br /> E) The finished coquina shell base shall be checked for thickness at internals of not more than 300 <br /> feet . Any areas which are less than 5. 1 /2 inches in thickness shall be corrected by scarifying and <br /> adding rock. The scarifying shall extend for 50 feet either side of the deficient area . Areas which <br /> are less than 1 /2 inch deficient in thickness shall be corrected if the Engineer determines that the <br /> area is extensive or, may adversely affect the quality of the finished work. <br /> 5 ) PRIME COAT <br /> RP- 3- 1 <br />