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Journal Article

Method of evaluating cement-to-formation bond strength with computed tomography image analysis Open Access

Arpita P. Bathija, Madhumita Sengupta, Shannon L. Eichmann
Journal: The Leading Edge
Published: 01 September 2022
The Leading Edge (2022) 41 (9): 611–616.
DOI: https://doi.org/10.1190/tle41090611.1
...Arpita P. Bathija; Madhumita Sengupta; Shannon L. Eichmann Abstract Invention of new cements for effective zonal isolation requires bond strength evaluation of the cement to formation. We present a method to evaluate the cement-to-formation bond strength based on the flow of cement through...
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Journal Article

Coralline algal Mg-O bond strength as a marine p CO 2 proxy Open Access

Maren Pauly, Nicholas A. Kamenos, Penelope Donohue, Ellsworth LeDrew
Journal: Geology
Published: 01 March 2015
Geology (2015) 43 (3): 267–270.
DOI: https://doi.org/10.1130/G36386.1
... uncertainty associated with vital effects and isotopic fractionation. Here we present a new structural proxy for carbonate chemistry; Mg-O bond strength in coralline algae. Coralline algae were incubated in control (380 μatm p CO 2 ), moderate (750 μatm p CO 2 ), and high (1000 μatm p CO 2 ) acidification...
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Journal Article

Bond Strength of Diaphragm–Shotcrete Interface in the Vertical Direction Available to Purchase

Sanjay S. Mehta, M.EERI, Donald G. Cameron
Published: 01 August 2013
Earthquake Spectra (2013) 29 (3): 1109–1123.
DOI: https://doi.org/10.1193/1.4000153
... by the bond strength of shotcrete–diaphragm interface. The concept of “development surface” of the diaphragm is presented based on the “diaphgram surface pull-out” tests in response to the concern that diaphragm-shotcrete interface may not have sufficient bond strength to develop full capacity of restraint...
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Book Chapter

Direct tensile test for bond strength between Portland cement paste and rock or mineral surfaces Available to Purchase

Author(s)
Michael A. Ozol
Book: Decay and Preservation of Stone
Series: GSA Engineering Geology Case Histories
Publisher: Geological Society of America
Published: 01 January 1978
DOI: 10.1130/Eng-Case-11.31
EISBN: 9780813759364
... Abstract Poor bond between the mortar and the coarse aggregate is one of the causes of low strength and poor durability of concrete. Some aggregate-paste combinations develop superior bonding that contributes significantly to structural strength. However, there is not yet a systematic...
Abstract
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Abstract Poor bond between the mortar and the coarse aggregate is one of the causes of low strength and poor durability of concrete. Some aggregate-paste combinations develop superior bonding that contributes significantly to structural strength. However, there is not yet a systematic presentation of data by which bond strength of paste aggregate interface can be optimized. In order for these data to be developed, there is a need for methods to test the bond strength. A direct tensile test for measuring the bond of rock surfaces to Portland cement paste has been devised using commercially available gripping devices and preparation equipment. The results of a series of tests on selected materials indicate the following order of bonding strength to cement paste: frosted glass, quartz, limestone, neat cement paste, dolomitic marble, augite.

Journal Article

Bond strength and sulfur isotopic fractionation in coexisting sulfides [discussion] Available to Purchase

E. H. Nickel
Journal: Economic Geology
Published: 01 December 1969
Economic Geology (1969) 64 (8): 934–935.
DOI: https://doi.org/10.2113/gsecongeo.64.8.934
View PDF for article title, <span class="search-highlight">Bond</span> <span class="search-highlight">strength</span> and sulfur isotopic fractionation in coexisting sulfides [discussion]
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Journal Article

Bond strength and sulfur isotopic fractionation in coexisting sulfides ; a reply Available to Purchase

Donald J. Bachinski
Journal: Economic Geology
Published: 01 December 1969
Economic Geology (1969) 64 (8): 936.
DOI: https://doi.org/10.2113/gsecongeo.64.8.936-a
...Donald J. Bachinski Abstract Nickel (ibid., p. 934-935) is correct in his conclusion that the relative bond strengths are, in decreasing order, FeS 2 , CoS 2 , and NiS 2 . (For original paper see ibid., v. 64, p. 56-65, 1969.) GeoRef, Copyright 2008, American Geological Institute. Reference...
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Journal Article

Bond strength and sulfur isotopic fractionation in coexisting sulfides Available to Purchase

Donald J. Bachinski
Journal: Economic Geology
Published: 01 February 1969
Economic Geology (1969) 64 (1): 56–65.
DOI: https://doi.org/10.2113/gsecongeo.64.1.56
...Donald J. Bachinski Abstract 'Bond strengths in sulfides are estimated from heats and free energies of formation, lattice energies, and other indirect, largely empirical methods.' Sequences, from greatest to least enrichment in S-34, predicted from bond strength, are pyrite, sphalerite...
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Journal Article

Bond strengths in the disulphides of iron, cobalt and nickel Available to Purchase

E. H. Nickel, A. H. Webster, L. G. Ripley
Published: 01 June 1971
The Canadian Mineralogist (1971) 10 (5): 773–780.
...E. H. Nickel; A. H. Webster; L. G. Ripley Abstract Decrease of microhardness FeS 2 >CoS 2 >NiS 2 , ligand-field stabilization effects retain constant total cohesive energy, sulfur-sulfur bonds strengthened proportionately to weakening of sulfur-metal bonds, pyrite from Spain, cattierite from...
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Bond-valence sum for dongchuanite. Note: Bond strength for Zn1 site o... Open Access

Published: 24 May 2023
Table 7. Bond-valence sum for dongchuanite. Note: Bond strength for Zn1 site occupancy of 0.55Zn 2+ +0.45Cu 2+ ; P1 site occupancy of 0.64P 5+ +0.36As 5+ . The bond-valence calculations were done using the equation and constants of Brown ( 1977 ), S  = exp[ R 0 − d 0 )/ b ]. Bond
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Bond length vs. bond strength curve for U-O and U-F bonds in a series of uranyl compounds (after Zachariasen 1954). Reproduced with permission of the International Union of Crystallography.

Bond length vs. bond strength curve for U-O and U-F bonds in a series of ur... Available to Purchase

Published: 01 July 2022
Figure 11. Bond length vs. bond strength curve for U-O and U-F bonds in a series of uranyl compounds (after Zachariasen 1954 ). Reproduced with permission of the International Union of Crystallography.
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Bond-length–bond-strength models for NbO6 octahedra in the silicate glasses. A. Unlikely model: NbO6 as a network former and linked to a tricluster. Note that the bridging atoms of oxygen (BO) are overbonded. B. Probable model: NbO6 as a network modifier with additional network-modifying alkali cations (Na). Both the bridging (BO) and non-bridging atoms of oxygen (NBO) have their average bond-valence requirements satisfied.

Bond-length–bond-strength models for NbO 6 octahedra in the silicate glass... Available to Purchase

Published: 01 June 2006
F ig . 9. Bond-length–bond-strength models for NbO 6 octahedra in the silicate glasses. A. Unlikely model: NbO 6 as a network former and linked to a tricluster. Note that the bridging atoms of oxygen (BO) are overbonded. B. Probable model: NbO 6 as a network modifier with additional network
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Bond-length–bond-strength models for NbO6 octahedra in the silicate glasses. A. Unlikely model: NbO6 as a network former and linked to a tricluster. Note that the bridging atoms of oxygen (BO) are overbonded. B. Probable model: NbO6 as a network modifier with additional network-modifying alkali cations (Na). Both the bridging (BO) and non-bridging atoms of oxygen (NBO) have their average bond-valence requirements satisfied.

Bond-length–bond-strength models for NbO 6 octahedra in the silicate glass... Available to Purchase

Published: 01 June 2006
F ig . 9. Bond-length–bond-strength models for NbO 6 octahedra in the silicate glasses. A. Unlikely model: NbO 6 as a network former and linked to a tricluster. Note that the bridging atoms of oxygen (BO) are overbonded. B. Probable model: NbO 6 as a network modifier with additional network
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SHORT RANGE BOND-STRENGTH AND BOND VALENCE INCIDENT AT THE BASAL O ATOMS AN... Available to Purchase

Published: 01 December 2003
TABLE 7. SHORT RANGE BOND-STRENGTH AND BOND VALENCE INCIDENT AT THE BASAL O ATOMS AND AT THE A SITES IN LEAKEITE (A), FERRIWHITTAKERITE (B), FERRI-OTTOLINIITE (C), SODIC-FERRI-FERROPEDRIZITE (D) AND FERRI-CLINOFERROHOLMQUISTITE (E)
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Measured bond strength in pull-out anchor tests. Source: Menkiti et al. (2014).

Measured bond strength in pull-out anchor tests. Source: Menkiti et al . ... Available to Purchase

Published: 07 May 2024
Fig. 21. Measured bond strength in pull-out anchor tests. Source: Menkiti et al . (2014) .
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Stress-strain curves under different parallel bond strength.

Stress-strain curves under different parallel bond strength. Open Access

Published: 24 November 2021
Figure 7 Stress-strain curves under different parallel bond strength.
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PAULING BOND-STRENGTH ( vu ) TABLE FOR C 2/ m AMPHIBOLE OF HYPOTHETICAL C... Available to Purchase

Published: 26 May 2021
TABLE 1. PAULING BOND-STRENGTH ( vu ) TABLE FOR C 2/ m AMPHIBOLE OF HYPOTHETICAL COMPOSITION □Ca 2 Al 5 (Si 3 Al 5 )O 22 F 2
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BOND-STRENGTH SUMS FOR ARRHENIUSITE-(Ce) ACCORDING TO THE PARAMETERS OF BR... Available to Purchase

Published: 04 March 2021
TABLE 7. BOND-STRENGTH SUMS FOR ARRHENIUSITE-(Ce) ACCORDING TO THE PARAMETERS OF BRESE & O'KEEFFE (1991) AND USING THE SITE POPULATIONS IN TABLE 6
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Monotonic, static bond strength of unconfined deformed bars with relatively small cover (data reported by ACI 408 2001 and Seliem et al. 2009).

Monotonic, static bond strength of unconfined deformed bars with relatively... Available to Purchase

Published: 01 June 2012
Figure 24. Monotonic, static bond strength of unconfined deformed bars with relatively small cover (data reported by ACI 408 2001 and Seliem et al. 2009 ).
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Bond strength strongly affects isotope fractionation. Aqueous Fe2+ (green, at left) forms weaker bonds with water molecules than Fe3+ (violet, at right). This is illustrated by the shape of the 0.05 e-/bohr3 electron-density isosurface, which pinches out (arrow) near the midpoint of each Fe2+-OH2 bond, but persists for Fe3+-OH2 bonds. Greater electron density along the bond axes correlates with stronger, more covalent bonds, which also tend to have higher force constants. At room temperature, 56Fe/54Fe is ∼3‰ higher for aqueous Fe3+ than coexisting Fe2+ (Johnson et al. 2002). Electron-density surfaces are derived from hybrid density functional theory (DFT) calculations.

Bond strength strongly affects isotope fractionation. Aqueous Fe 2+ (green... Available to Purchase

Published: 01 December 2009
F igure 1 Bond strength strongly affects isotope fractionation. Aqueous Fe 2+ (green, at left) forms weaker bonds with water molecules than Fe 3+ (violet, at right). This is illustrated by the shape of the 0.05 e - /bohr 3 electron-density isosurface, which pinches out (arrow) near
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Pauling bond strength model for the three types of surface oxygens on {101} and {001}.

Pauling bond strength model for the three types of surface oxygens on {101}... Available to Purchase

Published: 01 January 2009
Figure 2. Pauling bond strength model for the three types of surface oxygens on {101} and {001}.