5-24 Pay Item Pay Unit
Soil Cement Base Square Yard Portland Cement for Soil Cement Base Ton Aggregate for Soil Cement Base Ton
543-1 Description
Perform the work covered by this section including , but not limited to , keeping the stabilized layer moist; furnishing and applying the asphalt curing seal; correcting, maintaining and repairing the asphalt curing seal; and blotting sand where directed by the Engineer , to either a chemically stabilized soil layer or to a cement -stabilized base course.
543-2 Materials
Refer to Division 10. Item Section Asphalt, Grade CRS -1 1020 -3 Asphalt, Grade CRS -1H 1020 -3 Asphalt, Grade CRS -2 1020 -3 Asphalt, Grade RS -1 1020 -3 Asphalt, Grade RS -1H 1020 -3
543-3 Equipment
Use equipment to apply the asphalt material in accordance with Article 600 -5. Use equipment to apply water, curing seal and blotting sand that is of such type and weight that it will not damage the completed stabilized layer.
543-4 Construction Methods
Continuously moist en the finished stabilized layer or base course until the asphalt curing seal is placed. Place the curing seal as soon as possible, but no later than 24 hours after completing finishing operations except where delayed by wet weather. If wet weather delay s application of the curing seal, apply the curing seal as soon as the surface becomes sufficiently dry. At the time the asphalt curing seal is applied, prepare the surface of the stabilized layer or base so that it is free of all loose or extraneous mater ial and contains sufficient moisture to prevent excessive penetration of the asphalt material. If deemed necessary, sweep the base surface clean of loose material before applying the curing seal. Apply the curing seal in accordance with Section 600. Appl y the asphalt material to the surface of the completed stabilized layer or base at a target rate of 0.14 +/ - 0.04 gal/sy with approved equipment. Apply the asphalt material at the exact rate and temperature of application as established by the Engineer. Cure the underlying materials for 7 curing days. Curing time will be counted in at least 1/2 day units and only when the air temperature measured at the location of the operation is at least 50 °F. Complete the curing before placement of subsequent l ayers of pavement. Maintain the curing material during the curing period so that all of the stabilized layer or base will be covered effectively during the period. Provide sufficient protection from freezing to the stabilized layer or base during the enti re curing period and until it has hardened. Replace excessive loss of curing seal caused by heavy rains within 8 hours of placement.