compatibility of ultra high performance concrete as repair material

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(a) Molds to cast slant shearspecimens.Figure 3.9 Slant shear molds(b) Molds after applying aconcrete surface retarder toobtain a rough surface.(c) NSC substrate forslant shear samplesafter demolding.Normal concrete was poured in the free corner of the moulds. A steel bar was used toimprove the compaction of the concrete during its placing and a vibration of 5-10 secondswas applied once the mold was totally filled. After casting, all concrete substratesunderwent a 24 hour moist cure, according to ASTM C31/C31M. Afterwards, thesamples were demoulded and cured in a lime water tank for 28 days. Figure 3.5 showsslant shear substrates after demoulding.The surface treatments for the slant shear test were different to those of the splittingtensile test due to the fact that the smooth, brushed and chipped surfaces obtained for theindirect tensile test had similar profile. It was decided to work only with the brushedsurface because it is the most representative. A new surface was introduced in order toobtain a higher contrast with respect the other surfaces (brushed, sandblasted andgrooved).For obtaining the rough surface, a concrete retarder was applied to the wooden inserts inorder to delay the set of the concrete surface, facilitating the creation of exposedaggregate surface. The concrete retarder Formula F provided by The Euclid ChemicalCompany was used. This product does not affect the mechanical properties of theconcrete and offers the advantage that is applied directly to forms instead of applying toconcrete surfaces. This retarder was applied around 24 hours before casting concrete.Several layers had to be applied. More information about the concrete retarder used is54
found in the Appendixes. Figure 3.5 shows various molds coated with the retarder. Thesemolds were also dissembled 24 hours after pouring the concrete on them. The retardedmortar surface was easily removed by scrubbing with a metallic stiff brush. The surfaceobtained with this treatment was called rough surface and it is characterized for its highaggregate exposure. For the rest of surfaces, the same procedure as in the splitting tensilesamples was followed. Figure 3.10 shows the four concrete surfaces for slant shear test.(a) Rough surface.(b) Sandblasted(c) Brushed surface.(d) Grooved surface.Figure 3.10 Different NSC substrate surfaces for slant shear and pull off samples3.4.3 Pull off testPull off slabs were cast at the same time as slant shear samples. ASTM C 1583 wasfollowed with the exception that the test site (surface of the composite samples: 13x7 in)is smaller than 3 by 3 ft (1 by 1m) specified in the code due to the fact that this standardtest method is addressed to test in the field. The distances between cores and the depth ofthe circular cut through overlay below the interface was accomplished using the standardmethod. Figure 3.4 shows the dimension of the slabs and the distance between cores.55
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COMPATIBILITY OF ULTRA HIGH PERFORM
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Table of ContentsList of Figures ..
Page 5 and 6:
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
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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 62 and 63: 3.3.3 Pull-off testPull off test wa
Page 64 and 65: (a) Chipped surface, slightlybrushe
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
Page 112 and 113: mismatch and load eccentricity. Tho
Page 114 and 115: 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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