compatibility of ultra high performance concrete as repair material

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associated test results (temperature, slump, pressure air and unit weight) carried out rightafter mixing can be found in the Appendixes. Several compressive strength tests werecarried out with companion cylinders, 4x8 in, at different ages to assess the strength ofthe concrete. These compressive strength values are shown through Chapter 4.3.3 Experimental ProgramThe experimental program was carried out in two different steps. Firstly, the splittingtensile test was conducted. Once the results of this test were obtained, the slant-shear andpull off tests were designed. For this reason, there are some differences between thevariables studied in the splitting tensile test with respect to the slant-shear and pull offtests. These main differences are shown in Table 3.3:Table 3.3Different variables between the splitting tensile test and slant-shear and pull-off testsVariable Splitting tensile test Slant-shear and pull offtestsMoisture condition of theconcrete substrateConcrete surfacesAge of the compositesamplesBoth dry andsaturated conditionswere studiedSmooth, chipped,brushed, sandblastedand groovedLong term:185-298daysAll composite sampleswere cast on moisturesaturated concretesubstrateBrushed, sandblasted,grooved and roughShort term: 2-12 days3.3.1 Combination of Splitting Tensile Test with Freeze-Thaw CyclesTo assess how different surface treatments, substrate moisture conditions and freeze-thawcycles affect the splitting tensile bond strength, 90 composite and 14 monolithicspecimens were cast and tested. Table 3.4 lists the number of composite and monolithicspecimens assigned to each case study. The composite specimens, with a nominaldimension of 4x3x15.5 in, were made up of NSC and UHPC layers of 1.5 in each. Fourcomposite prisms were obtained from each beam for testing under indirect tension. Thistest was defined to study the bond strength in long-term performance since the age of the46
composite samples varied from 185 to 298 days. Figure 3.2 describes the process of thesplitting tensile test and the approximate tensile stress distribution along the interface.Without freezethawcyclingTable 3.4Splitting tensile slabs distribution for each case study300 freezingthawingcyclesMONOLITHIC SLABS600 freezingthawingcycles900 freezingthawingcycles3 specimens 3 specimens 3 specimens 3 specimensCOMPOSITE SLABSDry SubstrateWithout freeze-thaw cycling300 freezing-thawing cycles3 specimens per each surface treatment 3 specimens per each surface treatmentSaturated SubstrateWithout freezethawcycling3 specimens pereach surfacetreatment300 freezingthawingcycles3 specimens pereach surfacetreatment600 freezing-thawingcycles3 specimens per eachsurface treatment900 freezing-thawingcycles3 specimens per eachsurface treatment47
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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 .............
Page 9 and 10: 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 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 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
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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
Page 122 and 123:
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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