CRCP:
TEXAS STYLE
LISA LUKEFAHR, P.E.
TEXAS CONCRETE PAVEMENT
ASSOCIATION
ACPA 53rd Annual Meeting - Austin, Texas 2016
CRCP FUN FACTS
• 1921: Arlington,Virginia
• 1930’s – 1940’s: Indiana and Illinois
• 1951 – First 2 Texas Projects (Fort Worth)
• 2016 - 13,325 lane miles of TxDOT CRCP (2013-2016 PMIS
Annual Report)
• ~6.9% of total TxDOT Lane Miles
ACPA 53rd Annual Meeting - Austin, Texas 2016
CRCP FUN FACTS
• 1921: Arlington,Virginia
• 1930’s – 1940’s: Indiana and Illinois
• 1951 – First 2 Texas Projects (Fort Worth)
• 2016 - 13,325 lane miles of TxDOT CRCP (2013-2016 PMIS
Annual Report)
• ~6.9% of total TxDOT Lane Miles
ACPA 53rd Annual Meeting - Austin, Texas 2016
% OF LANE MILES WITH CONDITION
SCORE >70
TXDOT 2013-2016 ANNUAL PMIS REPORT
FY
ACP
CRCP
JCP
2013
89.02
86.15
61.07
2014
87.94
85.04
57.26
2015
87.62
84.35
61.08
2016
88.02
85.38
59.53
ACPA 53rd Annual Meeting - Austin, Texas 2016
OVERALL PERFORMANCE OF
CRCP IN TEXAS*
• Punchout: 1 per 8.8 lane miles
• Concrete Patch: 1 per 4.6 lane miles
• Asphalt Patch: 1 per 88 lane miles
* Moon Won, TxDOT Implementation Project 5-9045-5-P1, 2012
ACPA 53rd Annual Meeting - Austin, Texas 2016
OVERALL PERFORMANCE OF
CRCP IN TEXAS*
* Moon Won, 2014 TxDOT Construction Conference
ACPA 53rd Annual Meeting - Austin, Texas 2016
OVERALL PERFORMANCE OF
CRCP IN TEXAS*
140
810 total lane miles of
CRCP with HMAC overlay
Total Lane Miles
120
100
80
60
40
20
0
9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43
CRCP AGE AT FIRST AC O/L [YEARS]
* Moon Won, Memorandum to TxDOT ca. 2011
ACPA 53rd Annual Meeting - Austin, Texas 2016
EXAMPLE: US 59, SOUTHWEST
FREEWAY, HOUSTON
1993 Traffic Data Used for Pavement Design
127,000 1993 AADT
239,200 2023 AADT 41.3 MESALS 12”CRCP
3.7 % Trucks
ACPA 53rd Annual Meeting - Austin, Texas 2016
RESISTANCE TO TRAFFIC
UNDERPREDICTIONS
Current Traffic Data
1993 Traffic Data Used for Pavement Design
127,000 1993 AADT
239,200 2023 AADT 41.3 MESALS 12”CRCP
3.7 % Trucks
ACPA 53rd Annual Meeting - Austin, Texas 2016
RESISTANCE TO TRAFFIC
UNDERPREDICTIONS
30-year design
traffic realized
in less than 9
years!! Actual
30-year >200
MESALs
Current Traffic Data
1993 Traffic Data Used for Pavement Design
127,000 1993 AADT
239,200 2023 AADT 41.3 MESALS 12”CRCP
3.7 % Trucks
ACPA 53rd Annual Meeting - Austin, Texas 2016
TEMPERATURE AND TEMPERATURE
RANGE – AUGUST 2016
Houston
Chicago
Dallas
Los Angeles
Fine Print: Steel % and Steel location may not be universal.
ACPA 53rd Annual Meeting - Austin, Texas 2016
RECENT EVOLUTION OF TXDOT
CRCP STANDARD
• Concrete Pavement Working Group (TxDOT, Academia, Industry)
collaborated to incorporate 20+ years of research and observation to
generate 2009 CRCP Standard
• Tie-bar and transverse steel placement and amount no longer based on
Subgrade Drag Theory
• Other changes (will point out on standard)
• Low CoTE Standard released in 2012
• Minimum concrete thickness changed from 8.0 to 7.0 and half-inch
increments added
• CRCP-13 for single mat (7-13”)and double mat (14-15”) combines the
above changes, allowed tie bar inserter, new-to-old CRCP details for
widening and lengthening
ACPA 53rd Annual Meeting - Austin, Texas 2016
1. “b” bar removed
ACPA 53rd Annual Meeting - Austin, Texas 2016
1. “b” bar removed
2. Tie-bar spacing reduced
to 24” (fresh insertion
allowed in specification)
ACPA 53rd Annual Meeting - Austin, Texas 2016
1. “b” bar removed
2. Tie-bar spacing reduced
to 24” (fresh insertion
allowed in specification)
3. Transverse steel spacing
increased to 48”
(practical/constructible
max.)
ACPA 53rd Annual Meeting - Austin, Texas 2016
1. “b” bar removed
2. Tie-bar spacing reduced
to 24” (fresh insertion
allowed in specification)
3. Transverse steel spacing
increased to 48”
(practical/constructible
max.)
4. Tie bar under warping
joint
5. Additional bars through
header (more work
needed on this detail)
ACPA 53rd Annual Meeting - Austin, Texas 2016
6. % steel reduced to ~0.61 – 0.68
7. Low CoTE: % steel ~10% less
ACPA 53rd Annual Meeting - Austin, Texas 2016
JOINTS: FREE, TRANSVERSE, LONGITUDINAL
(WARPING AND CONSTRUCTION)
ACPA 53rd Annual Meeting - Austin, Texas 2016
DESIGN APPROACH
• Prescriptive, non-erodible bases
•
6” cement treated base and 1” ACP bond breaker
•
4” ACP or ASB
• Tied concrete shoulder or widened 2’ lane
• Steel located at mid depth
• 30 year Design Life, 95/90% reliability
• Most inputs fixed (strength of concrete, modulus, s.d., drainage, etc.)
• Will soon move to Quasi-ME (provides more credit for quality
base/subbase layers)
• Terminal Systems:
•
wide-flange
•
simple expansion joint
•
anchor lugs (no longer supported by Division experts)
ACPA 53rd Annual Meeting - Austin, Texas 2016
MATERIALS
• Low to Moderate CoTE coarse aggregates
* Andy Naranjo, TRB Webinar, 2015
ACPA 53rd Annual Meeting - Austin, Texas 2016
MATERIALS
• Low to Moderate CoTE coarse aggregates
• Fine Aggregate AI 60% (blending allowed)
• Encourage lower total cement content (<520 #/CY exempt
from ASR mitigation requirements)
• Allow Ty I, II, I/II, IL, IP, IS, IT, and V Cements
• Allow up to 35% fly ash replacement (Class C if total
cementitious content <520 #/CY)
• w/cm less than 0.50
ACPA 53rd Annual Meeting - Austin, Texas 2016
CONSTRUCTION
• Transverse or longitudinal tining
• Carpet drag for low-speed facilities
• First several NGCS recently completed in Houston
• 7-day compressive strength of 3,200 psi (or a lower value
proven to meet a 28-day compressive strength of 4,000 psi)
• Allows for occasional low strength (10%) results
• Strict deficient thickness enforcement with hefty penalties
• Ride Quality Requirements (IRI < 75)
ACPA 53rd Annual Meeting - Austin, Texas 2016
RECENT CRCP BID PRICES
ACPA 53rd Annual Meeting - Austin, Texas 2016
IH 10 KATY FREEWAY, HOUSTON, TX
• 12 main lanes
• 6 managed lanes
• 8 frontage road lanes
ACPA 53rd Annual Meeting - Austin, Texas 2016
IH 10 KATY FREEWAY, HOUSTON, TX
•
•
•
•
•
Long lasting
High performing
Low maintenance
Forgiving of under-design
Multiple Options for life
extension
• Grinding/grooving
• Bonded concrete
overlay
• HMAC overlay
• 12 main lanes
• 6 managed lanes
• 8 frontage road lanes
ACPA 53rd Annual Meeting - Austin, Texas 2016
CRCP: ALL-STYLE AND SUBSTANCE
• Questions?
ACPA 53rd Annual Meeting - Austin, Texas 2016