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Showing 1 to 10 of 10 for “"ordinary concrete"”.
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Optimizing the usage of fly ash in concrete mixes
… ash (FA), on a larger scale in the cement and concrete industry, by utilizing the FA to the optimum. In this study concrete mixes of 25 MPa, 35 MPa and 50 MPa with FA partially substituting the cement at 30%, 40%, 50% and 60% were produced and numerous tests were performed to determine the …
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ΝΕΑ ΥΛΙΚΑ ΘΩΡΑΚΙΣΕΩΣ ΕΝΑΝΤΙ ΦΩΤΟΝΙΩΝ ΚΑΙ ΝΕΤΡΟΝΙΩΝ ΠΑΡΑΓΟΜΕΝΩΝ ΑΠΟ ΙΑΤΡΙΚΑ ΜΗΧΑΝΗΜΑΤΑ.
"STEEL-CONCRETE" IS A MIXTURE OF CONCRETE AND "STEEL PUNCHINGS" (BY-PRODUCT OF PRESSES OF INDUSTRY). THE TRANSMISSION FOR THIS SHIELDING MATERIAL OF BEAMS PRODUCED BY TELETHERAPY UNITS FOR PRIMARY AND SECONDARY RADIATION, HAVE BEEN MEASURED. THE CONSTRUCTION COST OF THE TREATMENT ROOM USING …
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An investigation of the characteristics of high alumina refractory castables
<p>"Refractory castables or concretes, a comparatively new member of the refractories family, are an admixture of highly aluminous cements and graded refractory aggregates, blended in predetermined proportions very much like structural concrete. The refractory aggregates must contain a large amount …
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Prediction of early-age cracking of UHPC materials and structures : a thremo-chemo-mechanics approach
Ultra-High Performance Concrete [UHPC] has remarkable performance in mechanical properties, ductility, economical benefit, etc., but early-age cracking of UHPC can become an issue during the manufacturing process due to the high cement content and the highly exothermic hydration reaction. Because …
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Effect of pre-stressing on the durability of portland cement concrete
In view of the fact that prestressed concrete is extensively used in bridge construction and that it holds potentialities for eventual use in pavement construction, and that methods must be investigated to utilize an otherwise rejected aggregate which cannot be used for its poor performance under …
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High-performance and self-compacting concrete in house building. Field tests and theoretical studies of possibilities and difficulties
Cast in-situ concrete is the most frequently used materials technology worldwide within production of structural frames in multi-storey residential buildings. In Sweden, this technology dominates the market but is challenged by other competitive production methods. The criticism concerns issues as …
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New building materials in structural engineering: “Structural concretes made with Coarse and Fine recycled aggregates”
With more than three tons per head, per year, concrete is the most important and widespread material used in construction worldwide. The Italian code allows the use of waste produced by construction and demolition (C&D) operations to produce recycled aggregates. The great interest, both …
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Análise do desempenho térmico de sistema constutivo de concreto com EPS como agregado graúdo
… the thermal behavior of walls constructed with concrete blocks which composition aggregates the expanded polystyrene (EPS) reused in the shape of flakes and in the shape of a board, resulting in a “light concrete”. Experiments were conducted, systematically, with a wall (considerate …
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Development of High performance Concrete Composites Using Class F Fly Ash and PCC Bottom Ash, and a Statistical Model to Predict Compressive Strength of Similar Concrete Composites
… TITLE: DEVELOPMENT OF HIGH PERFORMANCE CONCRETE COMPOSITES USING CLASS F FLY ASH AND PCC BOTTOM ASH, AND A STATISTICAL MODEL TO PREDICT COMPRESSIVE STRENGTH OF SIMILAR CONCRETE COMPOSITES ADVISOR: Dr. Sanjeev Kumar It is a common knowledge that the use of concrete is as old as the …
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Víceúrovňové hodnocení křehkosti vybraných stavebních kompozitů
Zadaným tématem diplomové práce je víceúrovňové hodnocení křehkosti stavebních kompozitů. Práce se zabývá posudky lomových parametrů zkušebních těles z lehkého a obyčejného betonu. Zmíněná tělesa se dále odlišovala obsahem vláken v betonových směsích, jejich druhem a délkou. Práce se člení na dvě …