compatibility of ultra high performance concrete as repair material

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• To evaluate the grade of compatibility of UHPC with the normal strengthconcrete.The experimental results obtained in this project are based on tests performed onDuctal®JS1000. This is a commercially available brand in the United States provided byLafarge North America.1.2 Thesis OrganizationThe aim of this research is to characterize the bond between UHPC and NSC for potentialapplications of UHPC as repair material. This report is organized as follows:• Chapter 2 is a literature review containing the principles of UHPC, its materialproperties and the potential benefit that this advanced cementitious material cansuppose to the environment. This chapter as well describes the compatibility thathas to exist between the repair material and concrete substrate to ensure thesuccess of the rehabilitation.• Chapter 3 defines the experimental program.• Chapter 4 presents the experimental results and a discussion of them.• Chapter 5 closes with the conclusions and proposals for the further research.The author, Miguel Ángel Carbonell Muñoz, prepared this thesis, firstly as exchangestudent from Polytechnic University of Valencia (Spain). During this period, the splittingtensile test with 0 and 300 freeze-thaw cycles were finalized. Lastly, the study wascompleted with inclusion of the splitting tensile test with 600 and 900 cycles, slant-sheartest with different interface angles and the pull-off test as part of the requirements for theMaster of Science degree at Michigan Technological University.2
2 Background and Literature ReviewThis chapter presents the most significant properties of UHPC, the factors that have to beassessed to assure a good compatibility between two different materials and the bondfailure envelop concept. A special attention was given to the hydration process of UHPC,due to the fact that it widely differs from that of NSC and it is related to the mechanicalproperties development. From a point of view of structures rehabilitation, the overlay’ssetting time has a great importance owing to the economical saving that can be achievedby a short down time of the infrastructure.2.1 Ultra High Performance Concrete (UHPC)Currently in the United States, the formal definition of UHPC is under developmentwithin the American Concrete Institute (ACI), but a general description of this material ispresented in this section.UHPC is a cementitious composite material composed of an optimized gradation ofgranular constituents, a water-to-cementitious materials ratio less than 0.25, and a highpercentage of discontinuous internal fiber reinforcement. The Association Française deGénie Civil defines UHPC in its document about recommendations for Ultra HighPerformance Fibre Reinforced concretes (2002) as those materials with the followingproperties (Peuse 2008):• Compressive strength greater than 22 ksi• Nonbrittle behavior achieved by internal fiber reinforcement• High binder content with special aggregatesUHPC is a new class of concrete that offers high compressive strength and a negligiblepermeability. The latter makes UHPC as excellent protection against freeze-thawdeterioration, corrosion of embedded steel and chemical ingress. This new material is theresult of important developments in the cementitious materials technology that havetaken place in the last decades, such as, the development of puzzolanic admixtures andsuperplastizicers. The idea was to develop concretes with a homogenous and dense3
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: 1 Introduction and MotivationCurren
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
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(a) Molds to cast slant shearspecim
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Timber moulds were used to cast the
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macrotexture depth was measured in
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As shown in the above tables, the m
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(a) Concrete substrate under water
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used, as shown in Figure 3.17. A fa
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Equation 2.2 and Equation 2.3 were
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(a) Steel disks glued to the UHPC s
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value to the lowest one in the foll
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Transversal frequency (Hz)255025002
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115113Relative Dynamic Modulus (%)1
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Only those specimens with a grooved
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Table 4.6, continued.MeanMeanCOV,st
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concrete or bond/concrete while for
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surface treatment applied. In contr
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Table 4.8Summary of slant-shear tes
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(a) B(C): Bond due to concrete fail
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3143Bond Capacity, (psi)30002500200
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The different failure modes obtaine
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failures occurred in the concrete s
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property of the concrete has higher
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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
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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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