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  • 1
    Publication Date: 2019-01-29
    Description: In last decades significant investigation has been carried out in order to predict the bond strength of externally bonded reinforcement (EBR) systems with carbon fiber reinforced polymer (CFRP) materials in concrete and, as consequence of that, many analytical expressions can be found in the literature, including in standards. However, these expressions do not account for the influence of several parameters on bond behavior such as the type of surface preparation which is a mandatory and critical task in the strengthening application. The present work gives contributions to reduce this lack of knowledge. For this purpose, an experimental program composed of single-lap shear tests was carried out, the main parameters studied being: (i) the type of concrete surface preparation (i.e., grinding and sandblasting) and (ii) the bond length. Prior to the application of the EBR CFRP system, the roughness level provided by the different methods of surface preparation was characterized by a laser sensor. Test results revealed that sandblasting concrete surface preparation yielded higher values, in terms of maximum shear force and fracture energy. Finally, existing expressions in standards were upgraded in order to account for the concrete surface roughness level in the estimation of the bond strength.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 587-588 (June 2008), p. 877-881 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The experimental results of hooked-end steel fibers pullout tests on a self-compactingconcrete medium are presented and discussed in this work. The influence of fiber embedment lengthon the fiber pullout behavior is studied. The role of the end hook of the fiber on the overall pulloutbehavior is also investigated by carrying out tests with fibers without its end hook, in order toseparate the contribution of the frictional bond component from those derived from the mechanismsprovided by the end hook of the fiber. Finally, the experimental bond-slip relationships are modeledby an analytical model
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-879X
    Keywords: Reduction of copper-chromite ; copper-chromite catalyst ; surface Cu-enrichments ; carbon monoxide oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of prereduction on CO oxidation activity of unsupported copper-chromite oxide catalysts was examined. Results were found to be in good agreement with two mechanisms for a surface copper enrichment due to CO prereduction which produced an activity increase in the copper-chromite catalyst.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complex formation of Zn(II) and Cd(II) with polymethacrylic acid (PMA) and polyacrylic acid (PAA) is studied by sampled direct current, normal pulse, reverse pulse, and differential pulse polarography and by differential pulse anodic stripping voltammetry (DPASV). Titrations of Zn(II) or Cd(II) with partially neutralized PMA or PAA by DPASV allow the precise determination of the apparent formation constant K of the four systems. The two Zn(II) systems appear to be labile on the different time scales of the several techniques, without remarkable complications due to secondary phenomena. Their K values, determined by all techniques, agree satisfactorily. The two Cd(II) systems, and especially the Cd/PAA system, show rather involved behavior, which tends to normality when the degree of neutralization αn of the polycarboxylates increases. Both slow kinetics and ligand adsorption coupled with induced Cd(II) adsorption (evidenced by maxima on the normal pulse polarograms) seem to be present. For all αn values, DPASV yields higher estimates of K than do polarographic techniques.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1040-0397
    Keywords: Stripping voltammetry ; Metal complexation ; Latex ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Differential pulse anodic stripping voltammetry (DPASV) was applied to the study of the binding of ZnII, CdII and PbII by two kinds of polystyrene latex particles at different pH values and at different electrolyte concentrations. For the calculation of stability constants, the criterion of consistency between current and potential data was applied. For CdII and PbII, the application of DPASV yields qualitatively good results (in agreement with those previously found by DPP). However, from a quantitative point of view, the consistency criterion often reduces the applicability of the technique to quite narrow pH ranges, which increases the error in some calculations. In the case of ZnII, certain anomalies were found, rendering quantitative considerations impossible.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A system of equations based on the ionic atmosphere theory of Debye and Huckel, Born model contribution, and local compositions of the nonrandom two-liquid (NRTL) model is developed to represent isothermal activity coefficients, in the whole range of concentrations, for solutions in an undissociated solvent of a partially or completely dissociated electrolyte.The physical constants and the four adjustable parameters necessary to represent the osmotic coefficient, for fifteen strong aqueous electrolytic solutions, are given at 298.15°K and atmospheric pressure. Vapor-liquid equilibrium, for the hydrochloric acid-water system at 298.15°K, is represented for acid compositions ranging from infinite dilution to 18 M using a known dissociation constant and six parameters.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
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    Louvain-la-Neuve: European Regional Science Association (ERSA)
    Publication Date: 2015-09-02
    Description: Using two alternative approaches to the demand for public choice - median voter and interest group competition - central government and local governments public provision to Portuguese municipalities were analysed. Two political issues under the responsability of municipal governments (current intervention and environmental resources management) were compared with two issues that depend on central government decisions (basic healthcare and undergraduate education). Empirical results show that the response of public choice to political demand is quite similar whatever is the responsible level of government. This easy-communicability between central government provision and local demand reveals some ability of central government in apprehending local specifities. However this does not imply that central government provision shall continue, because empirical results indicate that local groups are succeeded in lobbying central government. Setting up the studied case of local provision as reference, if decentralization occurs, the destruction of nationally organized lobbying will not strongly reinforce local interest group pressure. Consequently, at a national perspective, decentralization may bring public choice closer to the preferences of majority.
    Keywords: ddc:330
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:conferenceObject
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  • 8
    Publication Date: 2015-09-05
    Description: When estimating a specification combining different influences on local public choice, three public issues of different ideological attributes were compared for two periods of Portuguese local government intervention: the beginning and the ending of one electoral cycle. The most exciting results of the paper are the significance of ideology at local level and the decline of its importance in the ending of the electoral cycle. There is also some evidence on the political influence of interest groups, especially in low visible issues. On the general issue, majority is also influent and fiscal illusion is found. Some preliminary panel data results including two electoral cycles are analyzed. JEL CLASSIFICATION: H42; H73; R51 KEYWORDS: Median Voter; Interest Groups; Ideology; Local Government, Opportunistic Political Cycle
    Keywords: H42 ; H73 ; R51 ; ddc:330 ; Median Voter ; Interest Groups ; Ideology ; Local Government ; Opportunistic Political Cycle
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:conferenceObject
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  • 9
    Publication Date: 2015-08-28
    Description: The analysis of the median voter hypothesis indicates that a more realistic comprehension of local public choice might be achieved with the opening of the median voter model to the interst group influence hypothesis. A non-nested specification that combines the two models is estimated and its results are compared to the median voter model (MVM) and to the interest group influence model (IGM) results. The empirical analysis is developed for the Portuguese and the Galician municipalities. In addition, I tested the hypothesis of the relative political power of the median voter and of interest groups to vary with the dimension of the population of the municipalities. Finally, I analyse the existence of institutional and political differences between the two territories and their effects on the results. Fiscal illusion is compared for Portugal and Galicia.
    Keywords: ddc:330
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:conferenceObject
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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