Paper presents an adaptive method of modeling of thin and thick plates using the method of equilibrated boundary stress resultants to estimate both discretisation and model error.
COBISS.SI-ID: 4546401
In this paper steel slag is considered as an aggregate which could improve fire resistance of concrete due to the fact that it is a material that occurs at high temperatures. Three concrete mixtures were exposed to high temperatures impact. Upon cooling of the specimens, their residual mechanical properties were tested. Achieved results and microstructural analysis promote the theory that steel slags could be used as fire resistant aggregates. This characteristic of material is important in case of use in railway tunnels.
COBISS.SI-ID: 1696615
Steel slags are by-products in the steel production industry and can be used for different purposes; e.g. as aggregates in concrete. It is thermally unstable, and upon heating it undergoes volume changes. Upon heating above 800 °C wustite decomposes into magnetite and this transformation is being accompanied by volumetric expansion, which introduces cracks in the the refractory concrete and drastically worsens its mechanical properties. If slag is heated up to a temperature of 1000 °C, slag become thermally stable in become suitable for use at elevated temperature.
COBISS.SI-ID: 1753959
Stresses, that can be applied on soil sample tested in standard triaxial test, can simulate conditions at certain depth of foundation soil at central axis of load, eg. central axis of building. This kind of tests can not reproduce general stress state, typical for foundation soil outside of central axis of building. Triaxial torsional apparatus was developed to enable such tests at anisotropic stress state. Hollow cylindric specimens are tested in this case. Paper presents tests made in two different sandy materials with different initial effective circumferential stresses. All tests were run in strain controlled mode like prescribed in Japanese standard for determination of deformation properties of soil with hollow cylinder apparatus. Tests were conducted at Slovenian National Building and Civil Engineering Institute (ZAG) in Ljubljana. Results show a great impact of anisotropic consolidation upon the shear stiffness of soil.
COBISS.SI-ID: 5780321
A model organic pigment (b copper phthalocyanine) was encapsulated by silica using water glass as a precursor. It is shown that the thickness, porosity anduniformity of silica shells (coatings) around individual pigment particles depend significantly on pH and temperature of synthesis. It is further demonstrated that the obtained silica shells can serve as an efficient protection against the highly reactive products of photocatalysis. The degree of protection depends not only on the thickness of silica shells but also on their porosity.
COBISS.SI-ID: 1856615