compatibility of ultra high performance concrete as repair material

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115113Relative Dynamic Modulus (%)1111091071051031019997950 50 100 150 200 250 300NSC 300 FT (1)NSC 300 FT (2)NSC 300 FT (3)NSC 300 FT (4)Freeze-thaw cyclesFigure 4.6 Relative Dynamic Modulus of NSC samples subjected to 300 freeze-thaw cycles4.1.2 Indirect tensile loadingSeveral cylinders were cast from each NSC and UHPC mixes in order to assess thequality of both materials. Table 4.2 gives the compressive strength of the repair and oldlayers on the same day as the splitting test was carried, in order to have a measure of thequality of both materials. By using Equation 4.1, given by ACI318-11, the splittingtensile strength for the concrete substrate was as well estimated.f ct = 6.7 ∗ f c in psiEquation 4.1where f ct is the splitting tensile strength and f c is the compressive strength.It should be mentioned that both f c and f ct do not represent the influence that the freezethawcycles could have on the overlay and substrate strengths of the composite specimensdue to the fact that these values are calculated from cylinders that were not exposed tofreeze-thaw cycling conditions.74
Table 4.2Age and compressive strength of overlay and substrate materials on the day indirect tension testBatch NSC Substrate UHPC overlayN° Age f c f ct N° Age f cDry Substrate, w/o and 300 FT 5 270-278 6.78 0.55 10 221-231 22.46Wet Substrate, w/o and 300 FT 4 278-280 6.46 0.54 6 185-186 22.14Wet Substrate, 600 FT 2 417-418 7.88 0.59 6 296-298 22.44Wet Substrate, 900 FT 4 437-438 7.79 0.59 6 317-319 22.20Monolithic, w/o and 300 FT 2 227-228 8.61 0.62 No applicableMonolithic, 600 and 900 FT 4 314-315 8.27 0.61 No applicableNote: N°: number of cylinders, w/o: without freeze-thaw cycles, FT: freeze-thaw cycles. Age in days.Strength in ksi.Table 4.3 sorts out the different NSC mixes with the corresponding samples cast fromeach and gives their compressive strengths at the age of 28 days.Table 4.3Age and compressive strength of overlay and substrate materials on the day indirect tension testNSC SubstrateMixBatchN° Age(days) Strength(ksi)1 st NSC mix Dry Substrate, w/o and 300 FT 2 28 6.512 nd NSC mix Wet Substrate, w/o and 300 FT 2 28 6.303 rd NSC mix Wet Substrate, 600 and 900 FT 2 28 6.854 th NSC mix Monolithic: w/o , 300, 600 and 900 FT 2 28 7.40Note: N°: number of cylinders, w/o: without freeze-thaw cycles, FT cycles: freeze-thaw cycles. Age in days.The splitting tensile test was carried out as described in 3.7.1.2. A large number of thecomposite specimens cast with the old substrate being dry failed during the cuttingprocess, indicating a general failure of the bond from construction (Austin et al. 1999)shows the percentage of prisms that split before the loading test with the dry concretesubstrate.Table 4.4Percentage of prisms that failed prematurely under dry concrete substrate conditionCase Percentage of failure (%) Case Percentage of failure (%)Sb 300 FT 50 Sm 300 FT 50Sb w/o 16.7 Sm w/o 75Br 300 FT 83.3 Ch 300 FT 100Br w/o 66.7 Ch w/o 100Note: Sb: sandblasted, Br: brushed, Sm: smooth, Ch: chipped, w/o: without freeze-thaw cycles, FT: freezethawcycles.75
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COMPATIBILITY OF ULTRA HIGH PERFORM
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Table of ContentsList of Figures ..
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4.3.2 Discussion ..................
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Figure 3.14 CSP index .............
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Table 4.7 Summary of indirect tensi
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List of AbbreviationsACI.AFtASTM.CO
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1 Introduction and MotivationCurren
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2 Background and Literature ReviewT
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spaces and to decrease the amount o
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water/binder=constantChoose steel f
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UHPC formulations and provides a se
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Table 2.3Comparison of UHPC materia
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esults obtained in this project wer
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2.1.3.4 Environmental Impact of UHP
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1997). Emmons and Vaysburd (1996) d
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e) ConstructabilityIt is recommenda
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Table 2.5, continuedCementitious ma
Page 36 and 37: • Rehabilitation of a bridge pier
Page 38 and 39: UHPC is a cost-effective solution i
Page 40 and 41: apparatus will measure the shear st
Page 42 and 43: substrate while the scarifying meth
Page 44 and 45: such test configuration, this upper
Page 46 and 47: From the equilibrium of forces of F
Page 48 and 49: The first layer, also called penetr
Page 50 and 51: 3 MethodologyThis report aims to st
Page 52 and 53: f sp = 2 ∗ PA ∗ π in psi Equat
Page 54 and 55: that the bond interface, in this lo
Page 56 and 57: Ductal® premix is typically compri
Page 58 and 59: associated test results (temperatur
Page 60 and 61: Figure 3.2 Detail of splitting tens
Page 62 and 63: 3.3.3 Pull-off testPull off test wa
Page 64 and 65: (a) Chipped surface, slightlybrushe
Page 66 and 67: (a) Molds to cast slant shearspecim
Page 68 and 69: Timber moulds were used to cast the
Page 70 and 71: macrotexture depth was measured in
Page 72 and 73: As shown in the above tables, the m
Page 74 and 75: (a) Concrete substrate under water
Page 76 and 77: used, as shown in Figure 3.17. A fa
Page 78 and 79: Equation 2.2 and Equation 2.3 were
Page 80 and 81: (a) Steel disks glued to the UHPC s
Page 82 and 83: value to the lowest one in the foll
Page 84 and 85: Transversal frequency (Hz)255025002
Page 88 and 89: Only those specimens with a grooved
Page 90 and 91: Table 4.6, continued.MeanMeanCOV,st
Page 92 and 93: concrete or bond/concrete while for
Page 94 and 95: surface treatment applied. In contr
Page 96 and 97: Table 4.8Summary of slant-shear tes
Page 98 and 99: (a) B(C): Bond due to concrete fail
Page 100 and 101: 3143Bond Capacity, (psi)30002500200
Page 102 and 103: The different failure modes obtaine
Page 104 and 105: failures occurred in the concrete s
Page 106 and 107: property of the concrete has higher
Page 108 and 109: 5.1.1 Combination of Splitting Tens
Page 110 and 111: 5.1.4 Overall performancea. For thi
Page 112 and 113: mismatch and load eccentricity. Tho
Page 114 and 115: 6 ReferenceAbu-Tair, A. I., Rigden,
Page 116 and 117: Climaco, J. C. T. S., and Regan, P.
Page 118 and 119: Graybeal, B., and Tanesi, J. (2007)
Page 120 and 121: Misson, D. (2008). "Influence of Cu
Page 122 and 123: Silfwerbrand, J. (1990). "Improving
Page 124 and 125: 7 Appendix: NSC mix designsTable 7.
Page 126 and 127: Table 7.33rd mix for the splitting
Page 128 and 129: Table 7.51st mix for the splitting
Page 130 and 131: Table 7.73rd mix for the splitting
Page 132 and 133: Figure 8.2 Concrete retarder inform
Page 134 and 135: Table 9.1, continued.BrBr w/oBr 300
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Table 9.2, continued.TrialBrushed 6
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10 Appendix: Splitting tensile pris
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Table 10.1, continued.128
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Table 10.2Splitting monolithic NSC
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11 Appendix: Slant-shear specimens
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PortionNumberof 1figures/tables/ill
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Figure 2.5Miguel Angel Carbonell Mu
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Miguel Angel Carbonell Munoz Mon, M
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Miguel - not sure what you need fro
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End Page 1235Type of UsePortionNumb
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Type of UseIntended publisher of ot
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