compatibility of ultra high performance concrete as repair material

More documents

Recommendations

Info

• Rehabilitation of a bridge pier using prefabricated UHPC shell elements in Zurich(Switzerland) in 2007: 1.57 in thick prefabricated UHPC shell elements were usedto protect the existing 40 year old reinforced concrete bridge pier.• Strengthening of an industrial floor in Geneva (Switzerland) in 2007: 1.57 in thickUHPC layer with rebars was poured on the top of the remaining reinforcedconcrete slab for the floor of a fire bridage building that had insufficient loadcarrying capacity.• Repair of the Dalvazza Bridge (Switzerland) in 2008: UHPC was used to repairthe deck of the bridge. Gravel was sprayed on the fresh UHPC to create theadequate surface for the traffic instead of using a bituminous pavement.2.2.4.2 Compatibility between UHPC and Concrete SubstrateThe potential compatibility of UHPC with the normal concrete substrate is presented.a) Bond strength with the substrateThe success of any rehabilitation depends on the bond performance. Lee et al. (2005)combined the slant-shear test with freeze-thaw cycling conditions to assess the bondstrength and bond durability of RPC with regular concrete. Results showed a good bondbetween both materials that is affected negatively by the inclusion of freeze-thaw cycles.However, further research is needed due to the fact that the slant-shear specimens had aninterface angle of 45°. Several researchers have shown that a greater joint angle fromhorizontal produces a more severe state of shear and compression stresses along theinterface.b) Curing requirement / setting propertiesGraybeal (2006) showed that the compressive strength of UHPC in ambient curing isalmost non-existent at 1 day after casting. Once initial set takes place, UHPC promptlygains strength up to 9.4 ksi at 48 hours approximately. This rapid strength gain wouldoffer the possibility of using the infrastructure in a short time after repairing.c) Dimensional stability24
Denarié et al. (2005) stated that restrained shrinkage tests on UHPC samples at early agesresulted in the development of stresses of approximately the 45% of the first crack tensilestrength. The higher modulus of elasticity of UHPC to that of NSC is compensated by itshigher compressive, bending and tensile strengths. Namely, the UHPC can absorb mostpart of the loads without failing due to its outstanding mechanical properties.Furthermore, Denarié et al. (2005) highlighted the strain hardening behavior of UHPC asanother characteristic that could help compensate for its higher modulus of elasticity.d) Mechanical propertiesAs previously mentioned, UHPC has sufficient mechanical properties to bear and transferthe loads to which it is going to undergo.e) ConstructabilityAside from different mixing process, UHPC has a similar placing and curing treatmentpractices normal concrete due to its cementitious character. Denarié et al. (2005), basedon the experience of several bridge rehabilitations, highlighted that several difficult steps,such as installation of waterproofing membranes and compaction by vibration, can beskipped by using UHPC. Therefore, the self-consolidating behavior of UHPC providesand advantageous feature when considering placing. Nevertheless it is required thatUHPC accommodates to specific slopes in some occasions, such as the longitudinal ortransversal slopes of bridge, for these situations, it is possible to develop differentformulations of UHPC in order to capable them of accommodate to different slopes of thesubstrate (Denarié et al. 2009b).f) Durability propertiesAs previously stated, UHPC exhibits extraordinary performance under harshenvironments that are markedly better than other materials, such as normal concrete orhigh performance concrete, as shown in Table 2.4. It must be stressed that UHPC stilloffers these outstanding protective properties under ambient curing treatment (Graybealand Tanesi 2007).g) Cost25
Page 1 and 2: 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 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 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,
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 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Table 10.2Splitting monolithic NSC
Page 150 and 151:
11 Appendix: Slant-shear specimens
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
PortionNumberof 1figures/tables/ill
Page 158 and 159:
Figure 2.5Miguel Angel Carbonell Mu
Page 160 and 161:
Miguel Angel Carbonell Munoz Mon, M
Page 162 and 163:
Miguel - not sure what you need fro
Page 164 and 165:
End Page 1235Type of UsePortionNumb
Page 166 and 167:
Type of UseIntended publisher of ot
show all

compatibility of ultra high performance concrete as repair material

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?