2010 North American Snow Conference

Transcription

1 Be sensitive to the environment while providing a safe service to the traveling public. Utilize materials that t produce good results, are friendly to the environment, and yet remain cost effective. Find equipment that meets our specific need. Utilize real time Road Weather Information. 1

2 Salt and Sand Salt Salt Brine Ice Slicer Magnesium Chloride Cold Temperature Modified Magnesium- Chloride Apex Apogee, non-chloride PRO s Most common product used Provides traction Works in all type of weather and storm events Initial Cost CON s Bad for the environment. Causes additional work for maintenance crews. Water and Air Quality Broken Windshields Cost of Clean-up Bicycle Safety Is not a de-icing material The contractor cleaned sand out of the creek and built 11 sand retention ponds. The cost of the clean up project was approximately $11,000,000 2

3 PRO s Adheres to roadway. Works from top down. Keeps snow pack from bonding. Cost Savings, reduces sand usage. Desired product in snow areas, where colder temperatures exist. CON s Additional storage and Containment Mixing of product is time consuming. Depending on what type of liquid deicer used to pre-treat sand, can leach out of sand. Ice Slicer is a homogenous (not blended) product containing: Mineral Percentage Complex Chloride TM 92-96% (Magnesium, Calcium, Sodium & Potassium Chloride) Water - contained as moisture to 3% maximum (RS) 2.5% Sulfur 0.13% Iron 0.07% Phosphorous 0.05% Iodine 0.002% Zinc 0.001% Copper % Manganese % 13+ Trace Minerals & Micro-Nutrients < 0.005% ICE SLICER contains all-natural corrosion inhibitors and environmental buffers crystallized within each granule - not just sprayed on the surface. 3

4 13 degrees PRO s Adheres to roadway. Keeps snow pack from bonding. Cost Savings, reduces sand & chloride usage. Consistent product CON s Additional storage and Containment Still a chloride Need of liquid id application equipment 1. Phosphorous mg/l 2. Cyanide mg/l 3. Arsenic mg/l 4. Copper mg/l 5. Lead mg/l 6. Mercury mg/l 7. Chromium mg/l 8. Cadmium mg/l 9. Barium mg/l 10. Selenium mg/l 11. Zinc mg/l 12. Ammonia mg/l 13. Molybdenum mg/l EFFECTIVE Effective Temperature is the lowest temperature in which the cost of the application is justified by the results obtained. Practical Practical operating temperature is where the results are within a reasonable time. EUTECTIC Eutectic Temperature is the freeze point of a solution based on percentage of chemical in the solution, and not the volume. 4

5 Cold Temperature Modified Mag-Chloride Increased Performance in the Red Zone PRO s Adheres to roadway. Keeps snow pack from bonding. Cost Savings, reduces sand & chloride usage. Consistent product Works down to 0 degrees CON s Additional storage and Containment Still a chloride Need of liquid id application equipment More Training needed Phase Diagram F) Temp (F % Solids MgCl2 M1000 Meltdown Apex AL Aluminum AL Aluminum SS304L - Stainless Steel SS410 - Stainless Steel Condensed MgCl2 on the surface of metal after pulled out of the solution 5

6 (Original states) (8 min. later) (6 hr. later) # Melted/gal Fig Comparison of hydrophilicities between MgCl2 and NaCl (When dry crystals of NaCl (top) and MgCl2 (bottom) are exposed to 50 0 C and 100% RH) Apex AP M1000 AP CaCl2 30% NaCl 23% # Melted/gal Apex AP M1000 AP CaCl2 30% NaCl 23% Anti-icing applications should be between 35 & 40 gallons per lane mile after the road has turned wet, but prior to an accumulation of snow or ice crystals. It is essential that the pavement be cleared of snow or loose ice before applying liquid chemicals to reduce the dilution that would result. 6

7 DE-ICING is a snow and ice control strategy in which chemicals are applied to the top of an accumulation of snow, ice, or frost that is already bonded to the pavement surface. 7

8 Early Fall Applications Be careful of road surface contaminants when there has not been moisture for extended periods of time. They can cause the surface to become slick with minimum application rates of de-icers. Anti-freeze Motor oil Diesel fuel Gasoline Rubber Watch for signs of change Give the product time to work no matter what product you are using Application rate for spraying liquids on sand or salt piles or to hot shot a load of sand or salt is 5 to 7 gallons per ton. Stock piles should be treated with????? (gradation of material) 8

9 Traditional Dry Application Pre-wet Salt Application Pre-wetting allows you to reduce the amount of material applied per lane mile and still get the same amount where you want it. The solid deicer also becomes more effective. Don t apply liquids on the shoulders. 20% 60% 20% 5 90% Critical % Critical Area Area 5 % Snow plow operators Supervisors Media Public Local Governments?????? 9

10 You must know the surface temp Grade School 10

11 Change of Patrols & treatment types. Test Section right side Control section left side TAPER Log Highway # I 70 Patrol # 5 Operator: Jack Frost_ Unit # 1313 Calibration Date: 11/27/ Date & Time of Application 12/15/02 2:00 p.m. 12/15/02 2:30 p.m. 12/15/02 3:00 p.m. 12/15/02 3:30 p.m. 12/15/03 4:30 p.m. 12/15/03 5:00 p.m. Start End Direction Lane Anti-icing Roadway Product Application Snow Results # Rate Mile Mile of or Surface Used In Point Point Travel Temp (F) Inches De-icing Gallons/Pounds Per Lane Mile East B. 1 Antiicing % Trace Just started snowing, Mag road turning wet Snowing road wet, West B. 1 Antiicing 29 27% 35 ½ Mag shoulder starting to slush Snowing harder Lane # East 2 Antiicing 21 27% 40 1 Bound Mag road still wet lane #2 road slushy Snowing, Lane # West 2 Antiicing 17 27% 55 2 Bound Mag starting to slush Lane #2 covered with snow and slush Snowing hard, lane East B. 1 Antiicing 13 M # road slushy, lane #1 snow packed. Snowing hard, lane # West 1 Antiicing 13 M Bound 1000 road slushy, lane #1 snow packed. Notes: Road turning wet from the M-1000 that was shot east bound. Shift change, going home. Remember the good old days Ground speed controlled spreaders Easy calibration 11

12 ??? How much Product is being applied per Lane Mile. ALL Sand Trucks and Liquid Units must be Calibrated. Do not Trust the Computer readouts in your Equipment. Perform actual tests between Computer read outs and the amount of Product that is Actually Applied AUGER CHAIN SPEED GATE LBS PER SPEED FLOW RATE SETTING HEIGHT LANE MILE RPM PER HOUR 3 4 INCHES INCHES INCHES INCHES INCHES INCHES INCHES INCHES INCHES mph mpm pounds pelbs Per LBS Per LBS Per LBS Per LBS Per LBS Per LBS Per LBS Per Minute Second Minute Second Minute Second Minute Second Application Rate lbs per lane mile

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15 Sensor uses a Peltier cell to cool and warm any moisture/liquid on the pavement. The controller monitors the temperature of the liquid on the surface as it is cooled and detects freezing. The change created during crystallization indicates the freeze point temperature. Road Sensors Have left the Road The SPECTRO is able to give a Friction reading from off the roadway The CYCLO is able to give surface temperature within.2 F and other readings Remote surface temperature measurement Infrared measurement principles Utilizes state of the art optical non-intrusive technology to measure Road State 3 eye safe lasers at differing frequencies are transmitted by top lens & received by bottom lens Measures amounts of Water Ice Snow / Frost Reports Friction 15

16 Both Instruments mount on structures to side of road Limitations are: c must be >6ft and <50ft ά must be >30º and <85º Thus maximum distance (b) from base of tower/pole to measured road surface is 40ft when sensor height (a) is 25 ft (Maximum distance from sensor to road is 50 ft) 16

17 Text messaging s Web Site Pre-Trip/Post-Trip 1 st Step to Safety Communicate Problems Let others know what is wrong Check your Equipment often Know the areas on the equipment that are constantly under stress 17

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