compatibility of ultra high performance concrete as repair material

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3143Bond Capacity, (psi)30002500200015001000500233924712545Acceptablebond strength a28 days (ACI546.3R-06 ):2000 to 3000psiAcceptablebond strengtha 7 days (ACI546.3R-06 ):1000 to 1800psi0Brushed, 60°, 8 days Sandblasted, 60°, 8daysRough, 60°, 8 daysGrooved, 60°, 8 daysFigure 4.12 Bond strength per case study obtained in the slant-shear test with an interface angle of 60° at 8 daysFigure 4.13 presents the results obtained with a joint angle of 70° at 8 days. The use ofthis more critical loading configuration presents the advantage that attains the actual bondcapacity of the brushed surface treatment. It can be observed that all bond capacitiesdecrease with the increment of the interface angle from the horizontal.3000Bond Capacity, (psi)250020001500100017572124176516345000Brushed, 70°, 8 days Sandblasted, 70°, 8 days Rough, 70°, 8 days Grooved, 70°, 8 daysFigure 4.13 Bond strength per case study obtained in the slant-shear test with an interface angle of 70° at 8 daysFigure 4.14 shows the evolution of different case study respect to time. It is significant tohighlight that the specimens with brushed surfaces in the concrete substrate obtained abond capacity, at the age of 3 days, greater than the requirements given by ACI 546.3R-06 at 7 days and also satisfies the requirements at 28 days. As previously mentioned, the88
ond and UHPC strengths exhibit an important increase at 2-3 days. The minimum bondcapacity achieved at the age of 2 days is substantially lower than that of 3 days, while thestrength obtained at 8 days is slightly greater than that of 3 days. This has a similarparallelism with the UHPC hydration process, defined in 2.1.3: there is a dormant periodfollowed by a strong energy release (Morin et al. 2002; Morin et al. 2001) and thehydration progress is narrowly associated to the compressive strength development(Kamen 2006). It seems reasonable to state that with this kind of UHPC formulation andunder ambient condition the threshold to achieve excellent bond occurs at 3 days. Aswell, it is appropriate to spotlight that the bond capacity of B-60-3d is lower than that ofB-55-3d.Bond capacoty (psi)300025002000150010005000At 8 daysAt 3 daysAt 2 daysBrushed, 60° Grooved, 70° Rough, 70° Brushed, 70° Brushed, 55° Rough, 55°Figure 4.14 Evolution of the bond strength per case study obtained in the slant-shear test4.2.2 DiscussionThe results from this loading configuration show that the bond between UHPC and NSChas an excellent performance under a state of shear and compression stresses regardlessthe surface treatment applied in the concrete substrate. The bond capacity at 8 dayslargely exceeds with the requirements specified by ACI 546.3R-06 at 7 days and alsosatisfies the minimum bond requirements for 28 days.89
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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
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• Rehabilitation of a bridge pier
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UHPC is a cost-effective solution i
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apparatus will measure the shear st
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substrate while the scarifying meth
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such test configuration, this upper
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From the equilibrium of forces of F
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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 86 and 87: 115113Relative Dynamic Modulus (%)1
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 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
Page 136 and 137: Table 9.2, continued.TrialBrushed 6
Page 138 and 139: 10 Appendix: Splitting tensile pris
Page 140 and 141: Table 10.1, continued.128
Page 148 and 149: Table 10.2Splitting monolithic NSC
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11 Appendix: Slant-shear specimens
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Table 11.1, continued.140
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Table 12.1, continued.142
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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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