Winter Maintenance Robert M. Peda Revised 08/10/2017 Workbook 09/12/2016
Goal: Discuss efficient & effective winter maintenance operations through implementation of proven best practices. 15
Creating a Winter Maintenance Plan 17
Components of a Winter Maintenance Plan • Budgeting • Weather Services • Materials Purchasing • Levels of Service • Materials Storage • Snow Emergency Routes • Equipment • Parking Restrictions • Personnel Materials Weather Services Personnel Budgeting Equipment 19
Budgeting 20
Materials Purchasing 22
Materials Storage 23
Levels of Service 30
Questions & Discussion 48
Sensible Salting & Winter Operations 64
Winter Services Approach – Type of Storm Spreading Storm 66
Winter Services Approach – Type of Storm Plowing Storm 67
Standard Application Rates 69
Standard Application Rates 70
Monitoring the Storm 71
Environmental Factors 72
Stockpile Facility Functionality 73
After Action Reviews W hat Happened W hat Might W hat W as AAR Be Learned Supposed to From W hat Happen Happened W hy W hat Happened Happened 74
Road Salt Basics for Sensible Salting 76
How Salt Works 77
Characteristics of Salt & Melting Capacity 78
80
81
Dilution of Solution 82
Pre-wetting Salt 90
Definition and Advantages of Pre-wetting 12% 46% in 15% center off road 1/ 3 1/ 3 1/ 3 100% dry salt spread in center 1/ 3 of road 91
Definition and Advantages of Pre-wetting 9% 78% in 2% center off road 1/ 3 1/ 3 1/ 3 100% pre-wetted salt spread in center 1/ 3 of road 92
Definitions and Advantages of Pre-wetting 95
Application Rates Pre-wetting Application Rates Liquid Chem icals NaCl ( Sodium MgCl 2 ( Magnesium CaCl 2 ( Calcium at Eutectic Chloride) Chloride) Chloride) Concentration Surface Pre-wet with 8 to 10 Tem perature Not Recommended Not Recommended Gallons/ Ton Above 25⁰ Surface Tem perature Pre-wet with 6 to 8 Pre-wet with 6 to 12 Not Recommended Between 0⁰ and Gallons/ Ton Gallons/ Ton 25⁰ 96
Pre-wetting Methods & Equipment 97
Pre-wetting Methods & Equipment Iowa DOT photo 98
Pre-wetting Methods & Equipment Iowa DOT photo Iowa DOT photo 99
Anti-icing with Brines 101
Definition and Advantages of Anti-icing 102
Definition and Advantages of Anti-icing 103
Anti-icing Decision Tree 105
Anti-icing Application Rates 108
Anti-icing Equipment 109
Anti-icing Equipment 110
Storage of Liquid Deicers 121
Calibrating the Spreader = Sensible Salting 155
Spreader Calibration Process Walk Through 158
Spreader Calibration Step 1 159
Spreader Calibration Step 2 160
Spreader Calibration Step 3 161
Calibrating a V-box 162
Spreader Calibration Step 4 • Set engine RPMs at normal operation range • Set Auger control at setting to be measured • Use stopwatch to count auger shaft revolutions per minute (60 seconds) 163
Spreader Calibration Step 4 164
Spreader Calibration Step 5 165
Spreader Calibration Step 6 166
Spreader Calibration Step 7 167
Spreader Calibration 168
Salt and Snow Management Resources 216
Questions & Discussion 217
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