Concrete Pavement Estimating 101 and. March 10, 2017 CPAM Concrete Paving Workshop Mankato MN Presenters:

Transcription

1 Concrete Pavement Estimating 101 and Economy of Scale March 10, 2017 CPAM Concrete Paving Workshop Mankato MN Presenters: Stefan Gantert, PE ---Bob McPartlin, PE

2 Common Questions: What is the price of Concrete this year? Will there be a Cement shortage? How is the schedule for the Paving Contractors? Will the Chicago Cubs repeat a World Series win?

3 Answers to Common Questions - Depends Never Always can use more work - - later, will answer - -

4 Focus on Depends Where e is your project? Rock & Sand availability; Access for material delivery Size of the project and particulars When will you let it? When is it to be essentially complete? How much contractor risk is there? Traffic Control Coordination with others Other

5 Get a Handle on Project Costs - mz New Way to look at old problem If we cannot learn from History, we will die by History Same old process done the same way will get the same result! Idea Generator: Concrete Ideas Abstract Ideas

6 Abstract Public document Wealth of Information xx items Project info (length, location, etc.) Low bidder and other bidder pricing info Sometimes Low Bidder is NOT the low PCC price!

7 Underlying Premise Time is Money Contractors want to make money Agencies want excellent value for the project An excellent project was designed No money is made when the paver stops (Costs continue?) Mother Nature always wins

8 Least Common Denominator 6 th -grade math Basic Units Easy Computations $$ per S.Y.-inch

9 Dollars per Square Yard - Inch From the Abstract: Concrete Placement - - $ / SY Thickness from plan sheet, item description, phone call Reduce to $ / SY inch Concrete Produced - - $ / CY Divide by $ / SY inch Add the two together No Dowel Bar prices, base prep Includes incidental tie bars, sawing, sealing, texturing May include other costs

10 Comparison to HMA 110 # / $50 / Ton = $2.75 / SY-inch Arithmetic relationship $25 / Ton = $1.38 $75 / Ton = $4.11 Not included: Gravel base Reclaiming costs Milling

11 Display the Information Doctorial Thesis Big words Many multi-syllable words Master sdegreenomograph s Pivot points Logarithmic Scales Bachelor s Essay Voodoo content Leave more questions than it answered Cliff s Notes Excel data points & Graph (Best-Fit): K-words and M-ideas

12 Basic shape of a Common Graph

13 Teenager s Age Parent Disposa able Income

14 P a r e n t I Q Teenager s Age

15 Vehicle Annual $ Miles Driven

16 Time Compr ressivee Strength of Concrete

17 $ per $/ SY in Size of Project S.Y.

18 $10.00 $9.00 Concrete Pavement Prices -- per Square Yard-Inch $8.00 $7.00 $6.00 $5.00 $4.00 $3.00 $2.00 nch $ per SY i R² = R² = R² = R² = $1.00 $0.00 Square Yards of Main Pavement 0 30,000 60,000 90,000120,000150,000180,000210,000240,000270,000300,000330,000360,000390,000420,000450,000480,000510,000540,000

19 Good in Theory Put into Action Steele County two projects Lyon County combo of projects --- new & O.L. Swift, Fillmore Cos. combination to add length Massage project data for better estimates t Common Sense approach Review like projects together Adjust project parameters for cost effectiveness

20 The Steele County Experience Stefan

21 Steele County Existing Conditions CSAH 45 Old Trunk Highway Various layers of aggregate base and bituminous pavement over old 18 wide concrete Existing surface consisted of 8-9 bituminous pavement in good condition based on cores Existing shoulders wide One of highest traffic volume roadways in Steele County often used as I-35 detour route Good candidate for unbonded concrete overlay

22 Steele County Existing Conditions CSAH 7 Existing surface consisted of 7-9 bituminous pavement over minimal aggregate base Bottom layers of existing bituminous in poor condition based on cores Existing shoulders 8-10 wide Primary access to many gravel pits in Steele County significant road deterioration over the last 5 years from construction activity Good candidate for new concrete pavement

23 Steele County - Proposed CSAH 45 unbonded concrete overlay 7.5 mile project wide concrete 6.0 miles of 6 concrete 1.5 miles of 6.5 concrete CSAH 7 concrete pavement Split into two projects Both projects - 28 wide concrete & 6.5 concrete North (N) miles --- dowels in outside wheel path South (S) 2.9 miles --- undoweled

24 Steele County - Photos

25 Steele County Bidding Structure Concern with funding of all 3 projects Engineer s Estimate - $8.6 million Project Priority CSAH 45 > CSAH 7 (N) > CSAH 7 (S) Bidding Options Option A = CSAH 45 + CSAH 7 (N) Option B = CSAH 45 + CSAH 7 (N) + CSAH 7 (S)

26 Steele County Bid Summary 4 bidders (3 of 4 used same concrete pricing) Engineer Estimate $4.05/SY/in. Option A Total area = 178,710 SY Range $3.32/SY/in. to $3.71/SY/in. Option B Total area = 227,206 SY Range - $3.23/SY/in. / to $3.76/SY/in. /

27 Putting Theory into Action Bob to continue

28 How project parameters influence the Graph Thickness --- 4, 5 to 6 vs. 6 7 vs. 8 9 Width vs. 14 Full-width vs One-lane paving Letting date / Completion date Weather, Seasonal changes Incentives --- w/c, /, smoothness, rock, time

29 How project parameters influence the Complexity Graph Turn lanes; lane drop; add lane Openings for intersection, driveway Multi-phase: Utility, spot grading, other Urban vs. Rural design --- C&G; median Batch plant vs. Ready-Mix External traffic congestion Internal traffic --- access; number of residents, etc Timing --- County Fair; Harvest; Milk route; etc

30 Graph as a TOOL To Help, Guide Variables --- controllable and uncontrollable Engineering i thinking required! Not for County Administrators!

31 $10.00 $9.00 Concrete Pavement Prices -- per Square Yard-Inch $8.00 $7.00 $6.00 $5.00 $4.00 $3.00 $2.00 nch $ per SY i R² = R² = R² = R² = $1.00 $0.00 Square Yards of Main Pavement 0 30,000 60,000 90,000120,000150,000180,000210,000240,000270,000300,000330,000360,000390,000420,000450,000480,000510,000540,000

32 Graph as a TOOL To Help, Guide Variables --- controllable and uncontrollable Engineering i thinking required! Not for County Administrators! Yes, the Cubs will win the WS again! Discussion to follow.....

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35 Questions?