Presentation on theme: "When to Pave a Gravel Road How to Evaluate Whether or Not to Pave a Gravel Road (When to Pave a Gravel Road) Rodger Young, P.E. Director of Technical Services."— Presentation transcript:
When to Pave a Gravel Road How to Evaluate Whether or Not to Pave a Gravel Road (When to Pave a Gravel Road) Rodger Young, P.E. Director of Technical Services Presented at 30 th Annual Asphalt Conference And Equipment Show
When to Pave a Gravel Road What is meant by a paved road –Light chip seal ? –Double chip seal ? –2-in. HMA mat ? –4-in. HMA mat ? Generally HMA mats < 2-in. have little real load-bearing capacity of their own.
When to Pave a Gravel Road What is meant by a paved road ? –Asphalt Institute refers to a paved road as one that has a HMA mat of 4-in. of full depth asphalt or 3-in. + suitable granular base. –System that has load bearing capacity. Surface-treated road –A roadway with < 2-in. HMA mat. –Protects the base material by shedding water and providing a smooth riding surface.
When to Pave a Gravel Road Decision to paved –Paving helps to seal the surface from moisture and protects the base and subgrade material, –Eliminates dust problems –Smoothness - Has higher user acceptance –Accommodate many types of vehicles that do not operate as effectively on unsurfaced roads. –Matter of trade-offs –Maintenance - Properly maintained, a gravel road can serve general traffic adequately for many years
When to Pave a Gravel Road Considerations for paving gravel roads –Local agencies considering paving roadways reducing roadway maintenance cost, providing a smooth riding surface eliminating environmental (dust) problems. –Local agencies should have a policy and criteria for paving gravel roads.
When to Pave a Gravel Road An approach for determining whether or not a roadway should be paved. –Roadway management program. Goal of the management program is to improve all roads by using good management practices Common sense system, step-by-step approach to scheduling and budgeting for maintenance work Establishes short-term and long-term maintenance goals, prioritizes projects within budget constraints
When to Pave a Gravel Road An approach for determining whether or not a roadway should be paved. –Roadway management program. Roadway inventory Roadway condition survey Determine appropriate treatments Establishes costs Sets priorities
When to Pave a Gravel Road An approach for determining whether or not a roadway should be paved. –Commitment to effective management Matter of making sure taxpayers money is well spent Planning for 5 or even 10 years instead of putting a band-aid on todays problem Using good management techniques instead of seat of the pants methods Taking time to do things right the first time and constructing projects to last
When to Pave a Gravel Road An approach for determining whether or not a roadway should be paved. –Traffic conditions and usage – life and maintenance requirements of a roadway is affected by the number of vehicles and their weight Establishing traffic volumes and type of traffic for when to pave Establishing functional importance of the roadway Establishing design and construction standards Establishing maintenance standards Roadway safety
When to Pave a Gravel Road An approach for determining if a roadway should be paved cont. –Economic evaluation Determining when it is more economical to pave than leave the roadway a gravel surface –Life cycle cost of the options
When to Pave a Gravel Road Life Cycle Cost Analysis By-Monthly Maintenance Cycle Roadway -- 24 foot width One mile in length Cost Item - Maintenance Application Year DoneArea Present Cost Future Value Present Worth Accumulated Present Worth Gravel RoadwayConstruction1100%$116,864 4" aggregate surfaceBlade2100%$21,120$22,843$21,532$138,396 6" Base CourseBlade and Gravel3100%$42,381$47,673$43,627$182,024 Subgrade prepMag Chloride4100%$20,416$23,884$21,220$203,244 Blade5100%$21,120$25,696$22,165$225,409 Blade 6 times/yearBlade and Gravel6100%$42,381$53,625$44,910$270,320 Blade & Gravel 1 time/yearMag Chloride7100%$20,416$26,866$21,845$292,164 Blade 5 times/yearBlade8100%$21,120$28,904$22,817$314,982 Mag Chloride 1 time/yearBlade and Gravel9100%$42,381$60,321$46,231$361,213 Blade 5 times/yearMag Chloride10100%$20,416$30,221$22,487$383,700
When to Pave a Gravel Road Life Cycle Cost Analysis By-Monthly Maintenance Cycle Roadway -- 24 foot width One mile in length Cost Item - Maintenance Application Year DoneArea Present Cost Future Value Present Worth Accumulated Present Worth Gravel RoadwayBlade11100%$21,120$32,513$23,488$407,188 4" aggregate surfaceBlade and Gravel12100%$42,381$67,853$47,591$454,779 6" Base CourseMag Chloride13100%$20,416$33,994$23,148$477,928 Subgrade prepBlade14100%$21,120$36,573$24,179$502,107 Blade and Gravel15100%$42,381$76,326$48,991$551,097 Blade 6 times/yearMag Chloride16100%$20,416$38,239$23,829$574,926 Blade & Gravel 1 time/yearBlade17100%$21,120$41,140$24,890$599,817 Blade 5 times/yearBlade and Gravel18100%$42,381$85,856$50,431$650,248 Mag Chloride 1 time/yearMag Chloride19100%$20,416$43,013$24,530$674,778 Blade 5 times/yearBlade20100%$21,120$46,277$25,622$700,400
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