1999-338A - Laserfiche WebLink

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• completed prior to making the field density - compaction test on the finished base. C. Should the subgrade material become mixed with the base course material at any time, the Contractor shall remove the mixture, reshape and recompact the subgrade, replace the materials removed with additional limerock, and reshape and recompact the limerock base at no cost to the Owner. D. If cracks or checks appear in the base which would impair the structural integrity of the base in the opinion of the Engineer, the Contractor shall remove the cracks or checks by rescarifying, reshaping, refilling with limerock where necessary, and recompacting at no cost to the Owner. T . The finished limerock base shall be checked for thickness at intervals of not more than 300 feet. Areas which are less than 1/2 inch deficient in thickness shall be corrected by scarifying and adding rock if the Engineer determines that the area is extensive or may adversely affect the quality of the finished work. The scarifying shall extend for 50 feet either side of the deficient area. 6. PRIME COAT A. The prime coat shall be a rapid curing liquid cut back asphalt equal or equivalent to RC -70 or RC -250 at the Contractor's option, and conforming to Sections 300 and 916 2 of the 1991 Edition of the Florida D.O.T. Standard Specifications for Road and Bridge Construction. S. The surface of the base material shall be cleaned after final compaction and the moisture content of the base shall not exceed 90 ,percent of the optimum moisture before the prime coat is applied. The prime coat shall be applied uniformly with a pressure distributor. The entire length of the spray bar shall be set at the height above the surface recommended by the Manufacturer for even distribution. The prime coat shall be applied to the finished base course at the rate of 0.15 gallons per square yard at a temperature between 1000 F. to 150o F. The prime coat shall be applied such that a period of no longer than two (2) hours lapse prior to application of the asphaltic concrete wearing course, unless the prime coat is covered with sand or screenings as outlined in Section 300-6.5 of the 1991 Edition of the Florida D.O.T. Specifications. 7, TESTING A. The maximum density and optimum moisture shall be determined in accordance with the Modified Proctor Test procedures of ASTM D1557 or AASHTO T180 (Method D). The percenta;e compaction and in place density shall be determined according to procedures of ASTM D2167 "Test for Density of Soil In Place by the Rubber Balloon Method" or the nuclear method ASTM D2922. In ?H•2 W