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Proper weight of mix for gyratory compactor Around 4500 - 5000g. Determined through the mix design process to achieve the height of 115 +/- 5mm ÖÖ Required amount of mix for Gmm (rice) samples? 2000 - 2200g total or 1000-1100 grams individually for two flasksÖÖ Required amount of mix for ignition samples? Depends on the mix. SP & FC 5, 9.5, 12.5 are 1500g. SP 19 is 2000gÖÖ Asphalt burns off at what temp 538°C (1000°F) ÖÖ The furnace must be capable of what temperature 650°C (1200°F) ÖÖ Flasks should be calibrated at what temperature and how often? 77 +/ 2°F of water and once a month or >0.4 grams of dry weightÖÖ How many parts of wetting agent to water 1ml wetting agent to 1000ml waterÖÖ The vacuum applied to flasks for GMM
FDOT ASPHALT PLANT LEVEL 1
EXAM (LATEST UPDATE 2024-
2025)GRADED A+
30 +/- 2mmÖÖ Vacuum pressure for GMM must be reached within 2 minutesÖÖ The Orbital Shaker must oscillate at 270 +/- 10 rpmsÖÖ The vacuum and oscillating test for GMM then continues for how long when it reaches target pressure 15 +/- 2minutesÖÖ Gyratory compaction angle is An internal angle of 1.16 +/- .02 degreesÖÖ Ram pressure for gyratory compaction is 600 +/- 18 kpa perpendicular to the axisÖÖ RPM the gyratory compactor operates at 30 +/- .5 gyrations a minuteÖÖ Gyratory (GMB) and Rice (GMM) samples must be conditioned at what temp and for how long Compaction temp +/- 9 for 1 hour +/- 5minutes and mix should be within +/-20° of compaction tempÖÖ The mold and base plate for the gyratory compactor should be in the oven for how long
What do the numbers mean for an asphalt binder? Ex: PG 67- 22 67 is the average 7 day high temp in Celsius and 22 is the negative low temp in CelsiusÖÖ ATPB stands for and is used in what? Asphalt Treatsd Permeable Base Used under concrete for drainage Friction Courses are required on what jobs based on AADT and Design Speed AADT > 3000 Design Speed > 35 mph A PMA asphalt binder stands for what? Polymer Modified Asphalt An ARB asphalt binder stands for what? Asphalt Rubber Binder Subgrade requires an LBR of what? 40 When do you sample tack? During unloading when it reaches 1/3 of the load What do you do first before sampling tack or binder? Discard the first gallon to clear the line What is the goal of sampling? To be done so randomly to avoid bias and creat uniform representative samples Lots are what size? 2000 or 4000 tn FC5 can only use what lot size? 2000 tn Sample sizes should weigh how much 35 lbs Sample box sizes should be what dimensions?
12"x8"x4" How do you sample an asphalt truck? In 3 different areas at least 12" down What type of paper do you use for FC5? Silicone coated non stick paper (no wax) Where should the hole be located for temping asphalt trucks? On both sides 6 - 10" higher than the bottom of the bed in the middle third of the truck What is the master range for truck temperatures for both the plant and roadway? +/- 30° This is also the temp you base rejections off of What is the criteria for temping asphalt trucks? Any single trucks should be +/-25° Average of 5 trucks should be +/-15° Gyratory Specimens should be cooled to what temperature? 77 +/-9°F What is the process for drying cores? In the core dryer. Weighing each time until the weight lost is less than 0.5 grams When cooled the GMM samples should be no bigger than? 1/4" (Stones that are bigger than 1/4" are excluded) When the Orbital Shaker time is up and pressure is released for the GMM how long do the samples sit? 10 +/- 1 minute When do you fill the flasks for the GMM with water? Before the 9 minute mark while sitting When do you cap the flasks for the GMM samples and weigh them? After 9 minutes has been reached on the timer and not to exceed 11 minutes What temperature of water is used throughout the GMM and GMB testing?
What is the hand sieveing process? Individually take a sieve at a time and with a cover plate and catch pan hold at an angle and hit with the heel of hand in an upward motion. Rotate the sieve 1/6 of a revolution every 25 strikes. There should be 150 strikes total/minute. The final gradation weight must be within what of the total weight of aggregate 0.2% % Passing Formula 100 - ( Weight Retained ÷ Extracted Agg) × 100 % Passing 200 Sieve Formula (Weight Lost from Wash + Weight Retained) ÷ Extracted Aggregate Weight × 100 S to N Downstation W to E Downstation Stationing Starts at 0+ Stationing Measurement 1+00 is 100 feet Straight Edge is the Measurement of Pavement smoothness with a 15 foot 4.573 m rolling straightedge Straight Edge is used to Identify problems Random sampling Are random numbers generated usually by a VT for cores to be extracted from the roadway How often should you calibrate a Straight edge
Calibrate at the start of each working period Using the manual straight edge you find what kind of spot to place the rolling straightedge? 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 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 Rolling Straightedge Manual Straightedge Manual Measurement (ruler) x4 3/16 shims 5mm thick x4 3/8 shims 10mm thick When to perform final straightedge After an entire lane has been paved When to perform final straightedge Pavement should be an ambient temperature You cannot use the straightedge until it has been properly Calibrated When performing the straightedge procedure Maintain proper traffic management and safety Cross slopes can be either done Manually or with a smart level When using a manual cross slope you first Place a simple level on pavement After placing the simple level on the pavement then you Raise the down end of the level until it is level (bubble center)
Fill hole with patch mix, if in lifts tamp each lift Storing cores 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 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 Dry / SSD - water weight = BSG Asphalt Temperature Heat and Cold Too hot cooks asphalt Too cold can't compact The hole for temping asphalt trucks should be located where Hole located in the middle third of length of truck; 6-10 inches above the bed Temping asphalt on the top At engineer's discretion Asphalt Temperature Master Range +-30; reject loads outside Temp every load monitored if 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 If they don't have a calibration chart you can not use them to distribute tack
Application rate of tack for close graded mixes Normal: 0.02-0.08 gal/yd^ Must apply temperature correction factor Calibration chart for distributor of tack 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 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 Find length of tacked road Station - station = station lineal feet or feet - feet = lineal feet Then determine square yards of lineal feet lineal feet X width / 9 = syds Using what chart to calculate start and end readings to find how many gallons were used Use distributor chart to calculate readings Start reading 11/13 = 1319g End 18/14 = 1140g Gallons used = 179g Using a temperature correction chart to find gallons used at 60F Correct gallons from 160°F to 60°F Using a temperature correction chart
Cool to be sampled with bags of ice Application rate for open graded mixed OGFC(open graded friction course FC-5): 0.045 gal/yd^ Spread rate of tack formula Spread rate = gallons used at 60°F / syds covered The breaking of emulsion is The water evaporating from the asphalt cement Binders Not PG 62- 22 Cross slope frequency Every 100 feet if in range then every 200 feet Degree of accuracy for levels 0.1 degrees Tack used at night PG 52-28 which is multiplied the specification rate by 0.6 to get your new target application rate. Heated between 250 and 300°F Tack allowed tolerance +-0.01 gal/syd Base, Structural, or dense graded friction 0.03 minimum gal/syd on new constructed 0.06 gal/Syd milled surface 0.08 gal/Syd concrete Open Graded Friction Course 0.05 gal/Syd newly constructed 0.07 gal/Syd milled Perform the straight edge where in the road In the outside wheel path Straightedge and joints
Use the manual and place 1 inch over the joint and measure Allow 3/8 deficiency Four things to know to calculate where cores lay Startinf station Target yield Width of road Random tonnages Formula to calculate core placement vertically 2000 ÷ target yield x 9 ÷ width = ft per ton of asphalt then Random number tonnage x ft per ton = ft away from starting station so starting station + feet = core location vertically Core placement horizontally Labeled as offset Based on width of road Feet away from edge of pavement Can't core a road with a thickness of Less than 1 inch Can't core areas less than how many feet not on the mainland 1000ft Nuclear Gauges and pqis are for Process control not a valid test for densities for the DOT
