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Influence of steel fibres addition on mechanical and selected rheological properties of steel fibre high-strength reinforced concrete

100%

Bywalski C. , Kamiński M. , Maszczak M. , Balbus Ł.

tom Vol. 15, no. 3

742--750

The paper discusses the mechanical and selected rheological properties of steel fibre high-strength reinforced concrete (SFHSRC). The creep deformation in compression, total shrinkage strain, compression strength, longitudinal modulus of elasticity and tensile strength of steel fibre high-strength reinforced concrete have been presented in the research. Steel reinforcements with a length of 13 mm and a diameter of 0.2 mm have been used. The content of fibres in 1 m3 of the concrete mix was 0, 78.5, 157 and 235.5 kg. Four batches of composite materials with different mixture compositions have been tested. The average compressive strength ranged from 128.2 to 147.7 MPa. The functional relations describing the increase of shrinkage and creep deformation in time have been discussed. The summary contains conclusions related to the rheological deformation of steel fibre high-strength reinforced concrete and the effects of steel fibre content on the mechanical properties of such composite materials.

Quartz c-axis fabrics in constrictionally strained orthogneisses: implications for the evolution of the Orlica-Śnieżnik Dome, the Sudetes, Poland

80%

Żelaźniewicz A. , Kromuszczyńska O. , Biegała N.

Acta Geologica Polonica

2013

tom Vol. 63, no. 4

697--722

The Orlica-Śnieżnik Dome (OSD), NE Bohemian Massif, contains in its core several gneiss variants with protoliths dated at ~500 Ma. In the western limb of the OSD, rodding augen gneisses (Spalona gneiss unit) are mainly L>S tectonites with a prominent stretching lineation. The few quartz LPO studies have produced somewhat discrepant results. Reexamination of these rocks revealed that texture formation was a protracted, multistage process that involved strain partitioning with changing strain rate and kinematics in a general shear regime at temperatures of the amphibolite facies (450–600°C). Quartz c-axis microfabrics show complex yet reproducible patterns that developed under the joint control of strain geometry and temperature; thus the LPOs are mixed features represented by pseudogirdle patterns. Domainal differences in quartz microfabrics (ribbons, tails, quartzo-feldspathic aggregate) are common in the Spalona orthogneisses but uncommon in the sheared migmatitic gneisses. In the latter rocks, the constrictional strain was imposed on the originally planar fabric defined by high-temperature migmatitic layering. The constrictional fabric of the Spalona gneisses may have developed in the hinge zones of kilometer-scale folds, where the elongation occurred parallel to the fold axes. Other occurrences of rodding gneisses throughout the Orlica-Śnieżnik Dome are thought to occupy similar structural positions, which would point to the significance of large-scale folds in the tectonic structure of the dome.