compatibility of ultra high performance concrete as repair material

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(a) Chipped surface, slightlybrushed.(b) Smooth surface, slightlybrushed.(c) Smooth surface, no dustremoval treatment applied.(d) Sandblasted surface. (e) Brushed surface. (f) Grooved surface.Figure 3.6 Different NSC substrate surfaces for splitting tensile samplesIt is necessary to mention that at first the smooth surface was considered to be withoutany surface treatment and the chipped surface to be only with small holes produced by ahand drill, but after casting the UHPC for the samples in the dry moisture condition, allthe composite specimens where the concrete surface was chipped or smooth failedprematurely after demoulding. This was due to the fact that no dust removal method wasapplied to these surfaces; therefore, no bond was achieved between new and oldmaterials. These samples were slightly brushed, and a new layer of UHPC was poured onthem, obtaining composite specimens that did not split right after demoulding. Figure 3.6and Figure 3.7 are clear examples of the difference between a slight brushed and nobrushed.(a) Samples after demoulding.(b) Sample in the middle ofthe brushing treatment.(c) Difference between asurface without anytreatment and a surfaceslightly brushed.Figure 3.7 NSC substrates after demoulding and during the surface treatment52
The equipment used in the surface preparation is shown in Figure 3.8. A steel brush wasemployed to remove the dust on the surface and the chipped surface was obtained byusing a steel drill-bit. The saw was used to make the grooves in the slabs, and asandblasting equipment was utilized to attain the sandblasted surface.(a) Cordless Drillwith a metallicbrush and a drillbit.(b) Saw to makethe grooves.Figure 3.8 Equipment for the surface treatment(c) Sandblastingequipment (outsideview).(d) Sandblastingequipment(inside view).3.4.2 Slant shear testThree different NSC mixes were made to cast all composite prisms. The compositeprisms were 3.5x3.5x14 in, fitting in the size range used by other researches andpreviously described in 3.1.2. These dimensions are large enough to allow castingconcrete substrate contrasting ASTM C 882 that use mortar substrate. Different methodscan be used to obtain the inclined surface in the concrete substrate. ASTM C 882recommends the use of dummy sections that are made up of epoxy-resin mortar, fit themold, and are equal to half the volume of the specimen with an angle of 30° fromvertical. In a similar way, Climaco and Regan (2001) utilized oiled wooden inserts intheir steel beam molds to form the slant surfaces in the substrate. Abu-Tair et al. (1996)and BS EN 12615:1999 (British Standard 1999) cast concrete prisms and later cut them at30° to the vertical. The constructive process chosen for this research consisted of workingwith wooden inserts in timber molds to obtain an inclined surface, as shown in Figure3.9.53
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COMPATIBILITY OF ULTRA HIGH PERFORM
Page 3 and 4:
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 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 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
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
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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Page 146 and 147:
Page 148 and 149:
Table 10.2Splitting monolithic NSC
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11 Appendix: Slant-shear specimens
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Page 154 and 155:
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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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