高拘束圧下におけるモルタルの破壊過程

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The present paper is concerned with the failure process of cement mortar under triaxial compressive stresses. To give the quantitative evaluation of process of failure of cement mortar with loaded history, the degree of failure α is defined as ; α=1.0-(uniaxial compressive strength of cement mortar specimen with loading history)/(uniaxial compressive strength of cement mortar specimen without loading history) The surface of the same degree of failure of cement mortar is determined in the three dimensional stress space. The following conclusions are made on the degree of failure of cement mortar under high triaxial compressive stresses. (1) The surface of the same degree of failure closes on the space diagonal. (2) The right section of the surface changes its shape with an increase of hydrostatic pressure. When the hydrostatic pressure is low, the shape is slightly bulged from an equilateral triangle with apexes in the direction of principal stresses. With an increase of hydrostatic pressure it becomes almost regular hexagonal, and changes into the slightly bulged equilateral triangle of the reversed mode to the former. (3) The stress condition for the same degree of failure can be approximated by a single curve expressed as a function of the sum and the difference of the maximum and the minimum stresses.p.1070Hereunder is presented the report on the investigation of the infrared absorption spectra in a variety of chalcogenide glasses. The absorption band at about 12. 5-12.7μ observed for As-S glasses prepared by the evaporation and/or distillation methods (Refs. 12 and 14) was formally attributed to the vibration of As=S bond in AsS_<2.5> component and/or to the AsS component included in a glass (Ref. 13). The corrected assignment of the band in this region is given by the present investigation to be due to the vibration of As-O bond. On the basis of this assignment the oxidation process in the above evaporation and distillation procedures is suggested for the preparation of As-S glasses. Two absorption bands near 15 and 21μ for As-S glasses shifted respectively from 15. 2 to 14. 5μ and from 20. 5 to 21. 1μ as the arsenic content decreased, provided that the thickness of the glasses was controlled within 0. 1-0. 2 mm. Correspondingly the relative intensity of the former band decreased and that of the latter increased. A possible structure coincident with these results is the formation of AsS_<2.5> component including the dative As→S bond in glasses in the AsS_<1.5>-S system. The following absorption bands are attributed to the contamination with oxygen : about 12. 6 and 16μ bands in As-Se and As-Se-Te glasses, 11. 2-11. 4 and 13. 6-13. 7 μ bands in Ge-As-Te glasses, 10. 2-10. 4 and 13. 9-14. 5 μ bands in Si-As-Te glasses. These bands, except the bands due to the Si-O bond in Si-As-Te glasses, can be eliminated by the melting procedure in carbon-coated silica glass ampule. The oxide-free As-Se, As-Se-Te and Ge-As-Te glasses show good transparency up to about 20 μ, whereas As-S glasses up to about 13μ; the uniform transmission is limited by about 10 μ for Si-As-Te glasses contaminated with oxygen because the reduction of SiO_22 by carbon is thermodynamically impossible.
社団法人日本材料学会の論文
1971-09-15

高拘束圧下におけるモルタルの破壊過程

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