COST COMPARISON OF CRCP TO FULL DEPTH HMA CASE STUDY ON LCC - WICHITA FALLS
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1 COST COMPARISON OF CRCP TO FULL DEPTH HMA CASE STUDY ON LCC - WICHITA FALLS
2 LIFE CYCLE COST ANALYSIS (LCCA) US 287 / US 81 MONTAGUE COUNTY LCCA WITH 20/20 HINDSIGHT
3 TABLE OF CONTENTS 1 2 Comparison of Continuously Reinforced Concrete Pavement (CRCP) to Full Depth Hot Mix Asphalt (HMA) US 287 / US81 Montague County Maps Wichita Falls District Leadership 6 4 Continuously Reinforced Concrete Pavement Overview Hot Mix Asphalt Overview Life Cycle Cost Analysis Other Factors to Consider
4 US 281 / US 81 MAP 4
5 THE PROJECT LIMITS AND PAVEMENT TYPES HMA CRCP 5
6 SPECIAL THANKS FOR 43 YEARS OF DATA COLLECTION SS{ Larry Tegtmeyer, P.E. District Engineer Wichita Falls Allan Moore, P.E. Director of Construction Wichita Falls 6
7 WICHITA FALLS CCRP SECTION HISTORY US 81 from Bowie UPRR overpass to Wise county was completed in 1972 with a pavement section of 8 continuously reinforced concrete pavement over a 4 asphalt stabilized based over a 4 compacted foundation course. Maintenance over the next 40 years consisted of full depth repairs and surface texture to improve skid resistance. 7
8 WICHITA FALLS CCRP PHOTO 8
9 WICHITA FALLS CCRP PHOTO 9
10 WICHITA FALLS HMA SECTION HISTORY In approximately 1976 TxDOT experienced drastic funding shortfalls, leading to staff reductions and reduced lettings. Completion of the Bowie expressway corridor was a high priority for the District, but economics forced the payment system to be reconsidered. Subsequently, US 287 from FM 174 to US 81 was completed in 1978 with a pavement section of 1.5 HMA over a one course surface treatment, over 11 flexible base, over 6 compacted subgrade. The plans note future construction of an additional 3 HMA. The section has been overlaid, seal coated, and crack sealed periodically since initial construction. 10
11 US 287 NORTHBOUND DRIVING LANE APPROX STATION
12 WICHITA FALLS HMA PHOTO 12
13 WICHITA FALLS HMA PHOTO 13
14 KEYS TO LIFE CYCLE COST ANALYSIS Initial construction methods, materials, & oversight Maintenance costs over lifetime of pavement Traffic and loading Climate (weather conditions) Costs were available using actual unit costs and estimates using an HMAC price trend developed from actual costs found for adjacent projects Inflation factor (present value) 14
15 US 287/US81 LIFE CYCLE COST WITH NO INFLATION ADJ 15
16 US 287/US 81 LIFE CYCLE COSTS WITH NO INFLATION ADJ LIFE CYCLE COST 16
17 IMPORTANCE OF USING INDUSTRY COST INDEX CPI = Consumer Price Index ENR = Engineering News Record (Dallas) price index UDOT = Utah Department of Transportation construction composite cost index 17
18 US 287/US81 LIFE CYCLE COST WITH COST INDEX 18
19 US 287/US 81 LIFE CYCLE COST WITH COST INDEX LIFE CYCLE COST 19
20 OTHER FACTORS BESIDES LIFE CYCLE COSTS LCCA provides critical information to the overall decision-making process, but not always the final answer. Other factors to consider: Risks Political concerns (such as available budgets, noise levels, and traffic delays) Environmental concerns (such as supply of materials, safety, recycling, and emissions) 20
21 OTHER FACTORS QUICK REVIEW HMA (BLACK) Hot Mix Asphalt is seen as cost effective, smooth, quiet, safe, perpetual, versatile, environmentally friendly, and requires less traffic delays. The United States has more than 2 million miles of paved roads and highways, and 94% of those are surfaced with asphalt. 21
22 OTHER FACTORS QUICK REVIEW HMA (BLACK) The Asphalt Pavement Alliance s HMA Life-Cycle Costs Fact Sheet Reduces costs for initial construction. Requires less maintenance over the life of the pavement. When maintenance is needed, HMA offers the widest variety of alternatives geared to solve the precise problems on the roadway. Can be overlaid to add structural capacity to account for increased traffic loading. Properly designed and constructed HMA pavements will last 50 years or more with occasional resurfacing, relieving road agencies of the need for costly, time-consuming and disruptive reconstruction. HMA can be recycled (milled and replaced along with fresh materials), saving dollars and preserving nonrenewable natural resources 22
23 OTHER FACTORS QUICK REVIEW - CRCP (WHITE) The Massachusetts Institute of Technology s Concrete Sustainability Hub released a report regarding lifecycle assessment (LCA) of concrete pavements. Among the findings; over 50 years, the mean real price of concrete decreases by 20% and the mean real price of asphalt increases by 95%. Ready Mix Concrete Association of Ontario (RMCAO) studies show that concrete and hot-mix asphalt performed similarly up to 2,000 trucks a day. 23
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