Laserfiche WebLink
40 <br />SECTION 02304 <br />CEMENTED COQUINA SHELL BASE COURSE <br />1. DESCRIPTION <br />A. Under this item, the Contractor shall furnish all equipment, labor, materials, <br />and transportation necessary to construct a Coquina shell base course upon <br />the completed stabilized subgrade. The base course shall be constructed in <br />accordance with the lines, grades, and typical section as shown on the Draw- <br />ings. Unless otherwise noted construction shall conform to the provisions of <br />Florida D.O.T. Standard Specifications for Road and Bridge Construction, <br />Section 250, 1986 Edition. <br />2. MATERIALS <br />A. Coquina shell shall conform to the requirements of Florida D.O.T. Standard <br />Specifications, 1986 Edition, Section 915, and shall be from a source accept- <br />able to Florida D.O.T. The material shall have a minimum LBR value of 100. <br />Prior to placement, the material shall be crushed or broken to such a size <br />f that no less than 97 nercent by weicht will nass a 3 1/2 inch sieve and no more <br />than 20 percent dry weight shall wash through a No. 200 sieve. No visible clay <br />or oreanic matter will be permitted. <br />3. PLACEMENT OF MATERIAL <br />A. After the subgrade is completed and approved, the Contractor shall furnish <br />and spread the coquina shell in a uniform distribution. Spread thickness shall <br />be a minimum of 9 inches. Segregated areas of fine or course rock will not he <br />permitted. Such areas shall be removed and replaced with properly graded <br />rock. <br />B. After the spreading is completed, the entire surface shall be scarified and <br />shaped so as to produce the required grade and cross section after <br />3 compaction. <br />4. COMPACTION <br />i_ <br />A. The required compaction of the coquina shell base course shall be a minimum <br />of 98 nercent of the maximum dry density. <br />S B. No less than 8- 10 ton steel drum or pneumatic tired roller shall be used to <br />compact the base course. All depressions shall be filled and the process of <br />rolling and filling shall continue until a thoroughly compacted uniform <br />surface is produced. During final compaction operations, if biading of any <br />area is necessary to obtain the true grade and cross section, the compactio., <br />operations for SUCK areas uiiaii v wiiipifa1d priv'i iv tnaniiib i 1 L.—'ua.1—j- <br />compaction test on the finished base. <br />C. Should the subgrade material become mixed with the base course material at <br />any time, the Contractor shall remove the mixture, reshape and recompact <br />the subgrade, replace the materials removed with additional coquina shell and <br />reshape and recompact the coquina shell base at no cost to the Owner. <br />02:10}. 1