compatibility of ultra high performance concrete as repair material

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3.3.3 Pull-off testPull off test was designed to study the bond strength at early age, similarly to slant-sheartest. All pull off samples were tested at age of 11-12 days. NSC blocks, with 13x7x4 indimensions, were cast and a UHPC layer of 1 in were poured afterwards, obtaining finalcomposite slabs of 13x7x5 in. These dimensions were chosen based on the followingcriteria for constructability: the rectangular shape is convenient to facilitate the mouldsfabrication, the dimensions were large enough to obtain three cores as established by therequirement of ASTM C 1583, and the specimens could also be moved easily. For eachcase study at least six cores were tested. Figure 3.4 shows the size of the compositespecimens and the distance between the three different cores obtained from each. Thecenters of core tests positions were 4.1 in apart and at least 2.5 in from an edge.Figure 3.4 Detail of pull off specimen and location of coring holes3.4 Preparation of concrete substratesFour NSC mixes were needed to cast all samples for the splitting tensile test while threeother NSC mixes were realized to cast all slant-shear and pull-off samples.50
3.4.1 Combination of Splitting Tensile Test with Freeze-Thaw CyclesThe three first NSC mixes of a total of four NSC mixes were used to cast substrates forthe composite samples. The fourth NSC mix was used to cast monolithic specimens withthe same size as those of composite specimens. Moulds were made of timber withoutapplying any varnish coat, but the bottom piece was covered with plastic to facilitate aneasier demolding process. After casting, all concrete substrates underwent a 24 hourmoist cure, according to ASTM C31/C31M. Afterwards, the samples were demouldedand cured in a lime water tank for 28 days. Figure 3.5 shows several stages of concretesubstrate preparation.(a) Vibration for 5-10 secondswas applied once NSC wasplaced into moulds.(b) Moulds before coveringthem with plastic.(c) Moist cure: cylinderswith water were placedbefore covering withplastic.Figure 3.5 Different stages in the preparation of the splitting tensile samplesWhen the concrete substrates reached 28 days of age, the surface preparation was carriedout. Smooth, chipped, grooved, brushed and sandblasted surfaces were chosen in order tocover a broad range of different roughness profiles and to represent some of the mostwidespread surface preparation techniques (Julio et al. 2005; Silfwerbrand 1990). Itshould be pointed out that the surfaces that were treated were those cast against thebottom piece of the moulds covered with plastic.Figure 3.6 shows the different surfaces obtained after the surface treatment. The grooveshad dimensions at approximately 0.24-0.43 in (6-11 mm) wide by 0.28-0.43 in (7-11mm) deep.51
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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 ..................
Page 7 and 8:
Figure 3.14 CSP index .............
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Table 4.7 Summary of indirect tensi
Page 11 and 12: List of AbbreviationsACI.AFtASTM.CO
Page 13 and 14: 1 Introduction and MotivationCurren
Page 15: 2 Background and Literature ReviewT
Page 18 and 19: spaces and to decrease the amount o
Page 20 and 21: water/binder=constantChoose steel f
Page 22 and 23: UHPC formulations and provides a se
Page 24 and 25: Table 2.3Comparison of UHPC materia
Page 26 and 27: esults obtained in this project wer
Page 28 and 29: 2.1.3.4 Environmental Impact of UHP
Page 30 and 31: 1997). Emmons and Vaysburd (1996) d
Page 32 and 33: e) ConstructabilityIt is recommenda
Page 34 and 35: 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 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 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
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mismatch and load eccentricity. Tho
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6 ReferenceAbu-Tair, A. I., Rigden,
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Climaco, J. C. T. S., and Regan, P.
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Graybeal, B., and Tanesi, J. (2007)
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Misson, D. (2008). "Influence of Cu
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Silfwerbrand, J. (1990). "Improving
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7 Appendix: NSC mix designsTable 7.
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Table 7.33rd mix for the splitting
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Table 7.51st mix for the splitting
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Table 7.73rd mix for the splitting
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Figure 8.2 Concrete retarder inform
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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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