DateLaboratory Testing of Portland Cement Concrete Patch Material ...

More documents

Recommendations

Info

1.0 BACKGROUNDIn the summer of 2001, the Wisconsin Department of Transportation (WisDOT)rehabilitated a section of State Trunk Highway (STH) 13 in Wood County, Wisconsin, usingthe dowel bar retrofit (DBR) technique (Bischoff & Toepel, 2001). This DBR project wasthe test site for a research study evaluating the performances of six different highperformance concrete (HPC) patch materials. Samples of all six patch materials from theSTH 13 DBR project were sent to the WisDOT Materials Laboratory for testing. Of the sixpatch materials, only the following three met all of WisDOT’s requirements for rapid setconcrete patch materials:• Tamms Speed Crete 2028 at 100% Extension 1 ,• Tamms Speed Crete 2028 at 80% Extension 1 , and• Mn/DOT 3U18 2 .As shown in Table 1 on the following page, WisDOT’s requirements for rapid settingconcrete patch materials used in DBR projects have been modified recently. At the time theSTH 13 DBR was constructed, rapid set concrete patch materials had to meet the standardrequirements established for inclusion on the WisDOT Approved Products List. 3 In 2004,WisDOT created a warranty specification (Pavement Dowel Bars Retrofit Warranted, Item416.0623.S) for the DBR technique with slightly different requirements for rapid settingconcrete patch materials. The DBR warranty specification also mandates the use of a curingagent that is a resin of 100 percent poly-alphamethylstyrene.1 The Tamms Speed Crete 2028 is a proprietary mortar material. The percentage of extension refers to theweight of coarse aggregate (3/8-inch pea gravel) added, in relation to the weight of mortar (bagged cementand sand blend) being used.2 Mn/DOT 3U18 refers to a modified version of the Minnesota Department of Transportation’sSpecification 3U18 concrete (modified with Type III cement, with a total alkali as Sodium Oxide contentno greater than 0.60 percent, instead of Type I cement).3 Testing of the rapid set concrete patch materials is conducted by the National Transportation ProductEvaluation Program (NTPEP), sponsored by the American Association of State Highway TransportationOfficials (AASHTO).1
Table 1. Rapid Setting Concrete Patch Material RequirementsWisDOT REQUIREMENTTESTED ASTM TEST 2001 WisDOT APPROVED DBR WARRANTY SPECIFICATIONPROPERTY PROCEDURE PRODUCTS LIST ITEM 416.0623.S (2004)Compressive Strength ASTM C 392000 psi @ 2 hours4000 psi @ 7 days3000 psi @ 3 hoursFreeze/Thaw Durability minimum durability factor minimum durability factor(w/ 5% sodium chloride solution) ASTM C 666 of 90% after 300 cycles of 90% after 300 cycles(using Procedure B) (using Procedure A)Initial Time of Set ASTM C 266 minimum of 15 minutes no requirementLinear Shrinkage ASTM C 531 maximum of 0.100% @ 3 days maximum of 0.100% @ 3 daysAlthough the three aforementioned patch materials met WisDOT's requirements in 2001,within one year they all showed signs of early distress on STH 13. All of the test sectionsconstructed with either Tamms Speed Crete 2028 or Mn/DOT 3U18 mix exhibitedmicrocracking and/or debonding, most likely caused by shrinkage (see Figure 1 below). Thedistresses observed in the Mn/DOT 3U18 test sections were the most severe.Figure 1. Patch Material Distress on STH 13MICROCRACKDEBONDINGDEBONDING FROM THETRANSVERSE EDGESOF THE SLOTSThe Mn/DOT 3U18 test sections exhibited both debonding and microcracking in some areas (left).Less severe debonding of the patch material, from the transverse edges of the dowel bar slots, wasobserved in the Tamms Speed Crete 2028 test sections (right).Since the Mn/DOT 3U18 patch material was significantly less expensive than the TammsSpeed Crete 2028 (approximately 1/10 th the cost) and its components were readily available,WisDOT deemed it worthwhile to seek an inexpensive way to improve the performance ofthe material. This study tested and evaluated various modified Mn/DOT 3U18 mixes in anattempt to prevent patch material shrinkage, and any associated cracking and debonding.The objective of this research was to find a cost-effective method of modifying the Mn/DOT2
Page 1 and 2: REPORT NUMBER: WI-01-04LABORATORY T
Page 3 and 4: LABORATORY TESTING OF PORTLAND CEME
Page 5 and 6: TABLE OF CONTENTSTechnical Report D
Page 7: Table 12. Concrete-to-Concrete Bond
Page 11 and 12: addition to these techniques, which
Page 13 and 14: manufactured by Perstorp Polyols, I
Page 15 and 16: Performance results reported by the
Page 17 and 18: 4.4 Concrete Curing CompoundsTable
Page 19 and 20: - 5.1.3 Air Content -The concrete s
Page 21 and 22: Figure 5. Time of Set Test Results2
Page 23 and 24: The change in height test results a
Page 25 and 26: - 5.1.6 Compressive Strength -A set
Page 27 and 28: Mn/DOT 3U18 (CONTROL) Mn/DOT 3U18 w
Page 29 and 30: - 5.1.7 Phase I Test Results Summar
Page 31 and 32: - 5.2.2 Compressive Strength -Since
Page 33 and 34: 26Figure 12. Length Change Test Res
Page 35 and 36: The freeze/thaw test results, which
Page 37 and 38: any dirt or epoxy. Then, the specim
Page 39 and 40: - 5.2.6 Concrete-to-Concrete Bond S
Page 41 and 42: - 5.2.7 Phase II Test Results Summa
Page 43 and 44: Table 14. Cost ComparisonADDITIVE/A
Page 45 and 46: The patch material containing Denka
Page 47 and 48: feasible, all test sections will be
Page 49 and 50: Roberts, J. W. (April 23, 2002) Imp
Page 52 and 53: Mn/DOT 3U18 (Control)PHASE I: MIX D
Page 54 and 55: Mn/DOT 3U18 (Control) (Continued)PH
Page 56 and 57: Type K Cement (Continued)PHASE I: M
Page 58 and 59:
KomponentPHASE I: MIX DESIGNS AND T
Page 60 and 61:
Denka CSA #20 (42.14 lb/yd 3 or 25
Page 62 and 63:
Denka CSA 100R (42.14 lb/yd 3 or 25
Page 64 and 65:
Peramin SRA330 (Continued)PHASE I:
Page 66 and 67:
Eclipse PlusPHASE I: MIX DESIGNS AN
Page 68 and 69:
Eclipse Plus (Continued)PHASE I: MI
Page 70 and 71:
SolitePHASE I: MIX DESIGNS AND TEST
Page 72:
HydrocurePHASE I: MIX DESIGNS AND T
Page 76 and 77:
Mn/DOT 3U18 (Control)PHASE II: MIX
Page 78 and 79:
Type K CementPHASE II: MIX DESIGNS
Page 80 and 81:
KomponentPHASE II: MIX DESIGNS AND
Page 82 and 83:
Denka CSA #20 (50.56 lb/yd 3 or 30
Page 84 and 85:
Tetraguard AS20PHASE II: MIX DESIGN
Page 86:
APPENDIX C:ADDITIONAL TESTING OFSAT
show all

DateLaboratory Testing of Portland Cement Concrete Patch Material ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?