Fdot Asphalt Paving Level 1Exam Questions And Solutions

FDOT Asphalt Paving Level 1EXAM QUESTIONS AND SOLUTIONS Random sampling - ANSWER Are random numbers generated usually by a VT for cores to be extracted from the roadway How often should you calibrate a Straight edge - ANSWER Calibrate at the start of each working period Using the manual straight edge you find what kind of spot to place the rolling straightedge? - ANSWER Locate a flat area with the manual straightedge and place the rolling straightedge next to the manual straightedge and the gauge should read 0 The 3/16 and the 3/8 shims go under which wheels during calibration - ANSWER The outside wheels to measure the low and the center to measure the high. Gauge should read 3/16 on the 3/16 shim and vice versa for the 3/8 shims. Make sure the center wheel moves up and down freely. Calibration materials for Straightedge - ANSWER Rolling Straightedge Manual Straightedge Manual Measurement (ruler) x4 3/16 shims 5mm thick x4 3/8 shims 10mm thick When to perform final straightedge - ANSWER After an entire lane has been paved When to perform final straightedge - ANSWER Pavement should be an ambient temperature You cannot use the straightedge until it has been properly - ANSWER calibrated When performing the straightedge procedure - ANSWER Maintain proper traffic management and safety Cross slopes can be either done - ANSWER Manually or with a smart level When using a manual cross slope you first - ANSWER Place a simple level on pavement After placing the simple level on the pavement then you - ANSWER Raise the down end of the level until it is level (bubble center) After the simple level is lifted until it is level you measure what - ANSWER The length of the simple level and the height between the (previously down) end of the level to the pavement Formula to calculate the manual cross slope - ANSWER Calculate the slope using the formula ( h / l ) x 100 = slope % Requirements for the rolling Straightedge - ANSWER Must have a read out gauge, kept clean and in working order, low and high reading, and marks to the nearest 1/16 (1mm) Rolling Straightedge pulled at - ANSWER 3 to 5mph or less Deficiencies pointed out with rolling straightedge you should first - ANSWER Mark the pavement at the center wheel where the needle initially shows a deficiency and where is ends. Also record location and measurements of deficiency. Core sampling is used for - ANSWER testing density and permeability Core sampling equipment - ANSWER Concrete saw Diamond bit core drill Size of core depends on test Ice chest (Optional) Ice (Optional) Asphalt to patch hole During core sampling the barrel should always be - ANSWER perpendicular to pavement Core sampling patching - ANSWER Fill hole with patch mix, if in lifts tamp each lift Storing cores - ANSWER Store in ice chest with bagged ice on top or put in an air conditioned cab Best stored upright in a cool place DO NOT THROW INTO PICKUP Determine Bulk Specific gravity on sampled cores - ANSWER Trim to correct lift Weigh dry sample if dry otherwise Place in water (77+-2) for 4+-1 minute Then roll within five seconds to achieve SSD weight Then dry to a constant weight with fan or core dryer Bulk Specific Gravity formula - ANSWER dry / SSD - water weight = BSG Asphalt Temperature Heat and Cold - ANSWER Too hot cooks asphalt Too cold can't compact The hole for temping asphalt trucks should be located where - ANSWER Hole located in the middle third of length of truck; 6-10 inches above the bed Temping asphalt on the top - ANSWER At engineer's discretion S to N - ANSWER Downstation W to E - ANSWER Downstation Stationing - ANSWER Starts at 0+00 Stationing Measurement - ANSWER 1+00 is 100 feet Straight Edge is the - ANSWER Measurement of Pavement smoothness with a 15 foot 4.573 m rolling straightedge Straight Edge is used to - ANSWER identify problems Asphalt Temperature Master Range - ANSWER +-30; reject loads outside Temp every load monitored if - ANSWER Mix within master range Differes for a single load from established temp by +-25°F Avg of five loads differes by +-15°F Monitor until within tolerance Tack Distributor without a calibration chart - ANSWER If they don't have a calibration chart you can not use them to distribute tack Application rate of tack for close graded mixes - ANSWER Normal: 0.02-0.08 gal/yd^2 Must apply temperature correction factor Calibration chart for distributor of tack - ANSWER Must be done by a reliable and recognized firm Chart provided to engineer prior to use Know the temperature of asphalt cement being used for Tack coat Measuring tack levels - ANSWER Stick the distributor before and after spraying tack Use calibration chart for Distributor to determine amount of asphalt in truck before and after spraying Formula for finding the length of a tacked road - ANSWER Find length of tacked road Station - station = station lineal feet