Time-of-Flight Texture Analysis of Limestone Standard: Dubna Results

Walther, K.; Heinitz, Joachim; Ullemeyer, Klaus; Betzl, M.; Wenk, Hans‐Rudolf

doi:10.1107/s0021889894013786

Cited by 24 publications

(9 citation statements)

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“…The pole figure measurements were carried out at the time-of-flight (TOF) texture diffractometer at the pulsed reactor IBR-2 of the Frank Laboratory for Neutron Physics of the Joint Institute of Nuclear Research at Dubna, Russia. The TOF method allows the recording of complete diffraction patterns by analysing the scattered neutrons in dependence upon their flight time [see Walther et al (1995) for a brief description of the method]; hence, all interesting pole figures can be measured simultaneously during a single experimental run. The Dubna texture diffractometer (Ullemeyer et al 1998) is located at the end of a very long flight path ( 1 100 m) to obtain good spectral resolution (Dd/d;0.5% at dp2Å and 2Qp907; d: lattice spacing, Q: scattering angle).…”

Section: Texture Determinationmentioning

confidence: 99%

Physical weathering of marbles caused by anisotropic thermal expansion

Siegesmund¹,

Ullemeyer²,

Weiss³

et al. 2000

International Journal of Earth Sciences

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241

135

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Marbles as building stones as well as in their natural environments show complex weathering phenomena. The most important damage scenario is based on the highly anisotropic thermal expansion coefficient a of calcite, i.e. extreme expansion parallel and contraction normal to the crystallographic c-axis. Therefore, the rock fabric and especially the latticepreferred orientation (texture) of calcite and/or dolomite as the predominant mineral phases in marbles have a significant influence on the mechanical weathering. The textures of marbles from five different locations vary from a more or less perfect prolate to moderate oblate shape of the [006] pole figure tensor. Accordingly, the texture-derived bulk thermal dilatation anisotropy covers a broad range from -0.048 to 0.680. The modelled thermal dilatations correlate with those obtained from experimental measurements. The difference in magnitude is basically explained by the microcrack fabrics which was not considered in the computations. All samples show a deterioration due to thermal treatment regardless of the strength of texture. The directional dependence of (a) the total magnitude of the thermal dilatation coefficient and (b) of the residual strain is highest in marbles with a strong texture, whereas the Carrara marble with a weak texture exhibits a uniform crack formation. The progressive loss of cohesion along grain boundaries due to dilatancy may serve as an example for the initial stage of physical weathering.

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Section: Texture Determinationmentioning

confidence: 99%

Physical weathering of marbles caused by anisotropic thermal expansion

Siegesmund¹,

Ullemeyer²,

Weiss³

et al. 2000

International Journal of Earth Sciences

Self Cite

241

135

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show abstract

“…Three complete PFs, (111), (200) and (220), were measured by means of neutron diffraction for the Cu rod at the spectrometer TEX-2, GKSS, Germany [7] and for the Al-6% Mg alloy sheet at the spectrometer NSHR, JINR, Russia [8]. The experimental and recalculated PFs are shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Some Practical Results for Calculating Elastic Properties of Textured Cubic Polycrystals

Lychagina

Brokmeier²

2001

phys. stat. sol. (a)

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The aim of this work is to compare elastic properties of cubic materials with different texture types calculated with orientation distribution function (ODF) obtained by different methods: iterative series expansion method, Williams-Imhof-Matthies-Vinel (WIMV) and texture component method. We have used the approach of mean values for the calculation of elastic properties with different approximations (Reuss, Voigt, Hill). The calculations were carried out on a rolled Al-6% Mg alloy sheet and on an extruded Cu rod. The experimental pole figures were obtained by means of neutron diffraction and used for ODF calculation. The conformity between the different results is discussed.

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“…To determine the texture, neutron diffraction was applied. The pole figure measurements wcrc carried out at the time-of-flight neutron diffractometer NSHR, which is located at the pulsed reactor IBR-2 of the Frank Laboratory for Neutron Physics of the Joint Institute of Nuclear Research at Dubna (Russia) (Walther et al 1995: Ullemeyer et al 1998). …”

Section: Methodsmentioning

confidence: 99%

Bowing of marble panels: on-site damage analysis from the Oeconomicum Building at Göttingen (Germany)

Koch

Siegesmund

2002

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The use of natural stone panels or cladding material for building facades has led to some durability problems, especially with marble slabs. To examine the effects of intrinsic and extrinsic parameters on bowing, a very detailed study was performed on the Oeconomicum Building at the University of Goettingen. In total 1556 panels from the whole building were measured with respect to bowing using a bow-meter. The variation of bowing ranges from concave (up to 23 mm/m) to convex (up to -11 mm/m). The variation is not controlled by the position with respect to the geographical coordinates, height above ground, shadows, temperature etc. On the north facade the different rock structures visible on the panel surfaces are a result of the marble slabs being cut in different directions. The different degrees of bowing are associated with the structure of the marble since all other influencing factors are relatively constant (position, temperature, moisture content, building physics). Experimental data on the expansion behaviour under dry and/or wet conditions reveal different degrees of bowing with respect to the rock fabric and may help to explain the observed differences in bowing. The effect of the rock fabric, especially of the lattice preferred orientation in this case, clearly controls the deterioration of the marble and the degree of bowing. The bowing is also characterized by an increase in the porosity, decreasing values of ultrasonic wave velocities and flexural strength. The loss of cohesion in the strongly deteriorated panels is clearly visible in the microstructure by the open grain boundaries which are interconnected to intergranular microcracks.

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Time-of-Flight Texture Analysis of Limestone Standard: Dubna Results

Cited by 24 publications

References 0 publications

Physical weathering of marbles caused by anisotropic thermal expansion

Physical weathering of marbles caused by anisotropic thermal expansion

Some Practical Results for Calculating Elastic Properties of Textured Cubic Polycrystals

Bowing of marble panels: on-site damage analysis from the Oeconomicum Building at Göttingen (Germany)

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