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ASTM 2922 (Nuclear Method), or other method as <br />approved by the County Engineer is required for <br />both subgrade and base course construction. A <br />minimum of two in place density tests are re- <br />quired regardless of size of pavement areas. <br />Soil -cement testing shall be as per Indian River <br />County Standard Specifications. <br />2. Rigid (Concrete) Pavement consisting of the follow- <br />ing (a) and (b) : <br />a) A six (6) inch thick subgrade stabilized to a <br />Florida Bearing Value of 50 psi minimum and com- <br />pacted to a minimum of 95% maximum density using <br />AASHTO T-180. Testing shall be as for Flexible <br />Pavement above. <br />b) For non industrial use, a 4-1/2 inch thick non <br />reinforced concrete pavement. For industrial <br />and frequent truck use, a minimum six (6) inch <br />thick non reinforced concrete pavement. Design <br />thickness for heavy equipment use shall be in <br />accordance with the Portland Cement Association <br />recommendations. Calculations shall be submitted <br />to the County Engineer with the request for Rigid <br />Pavement design showing the structural adequacv <br />of the design and the design life of the project. <br />All concrete to be 3000 psi in 28 days (AASHTO <br />T023). All materials, longitudinal, transverse <br />and construction joint location, material place- <br />ment, and finishing shall be as recommended by <br />the Portland Cement Association and the Concrete <br />Promotional Council of Florida. At least 3 com- <br />pressive strength cylinder samples shall be taken <br />for every 10,000 square feet of pavement, or 5 <br />per job; whichever is greater shall apply. Slump <br />shall be 2 to 4 inches (AASHTO T-119). Compres- <br />sive strength shall be reported for 7, 14, and <br />28 days after placement. <br />- 2 - <br />