Padevět, Pavel

English

DSpace at VSB Technical University of Ostrava

li LI Bl I Sborník vědeckých prací Vysoké školy báňské - Technické univerzity Ostrava číslo 1, rok 2009, ročník LII, řada hutnická článek č. 1460 MECHANICAL PROPERTIES OF 60MP A STRENGTH CONCRETE P.PADEVĚTCzech Tech11ica/ UniversiJy in Prague, Faculty o/ Civil Engineering, Department o/ Mechanics; Prague, Czech Repub/ic, pavel.padevet@fsv.cvut.cz ABSTRACT: The paper describes the testing of mechanical properties of the concrete. Mechanical properties of concrete are used for design of constructions. Strength in compression and tension, Modulus of elasticity, stress-strain curve are very important. High performance concretes are modem and often used in constructions nowadays. Concrete with cement ratio of 0.35 was tested in compression and in the Brazilian test. Superplasticizer was used for concreting .. Evolutions of properties in the time were observed. Concrete specimens were tested in 7, 14 antf 28 days. Prism specimens 400 mm tall were used for testing in compression were and for the Brazilian tests were used cubes with edge of 100 mm. Strength in compression after 28 days was 58.8 MPa and strength in lateral tension was 5.34 MPa. Curves of evolution of the strength in compression and tension, Modulus of elasticity were created from data of measuring. Slump test was modelled by OOFEM software. Rise of concrete flow, height of cone and diameter of concrete cake were measured. KEY WORDS: concrete, strength, slump test, Brazilian test, Modulus ofElasticity 1. INTRODUCTIONGoal of suggestion of properties of higher strength concrete is to gain the adequate base and information about designed concrete. Suitable design method for acquisition of material properties of concrete is passing adequate quantity of information for verification of theoretical design of construction. Simultaneous results give control pieces bf information about quality, method of concrete processing and its final properties. Problem in giving the valuable material properties lies in different approach in observing of parameters of concrete. 1t is possible to obtain different results by different methodology, and it is necessary to interperet them correctly. For example, compression strength can be higher for cubic specimen and lower for tall prism specimens. Properties of high strength concrete are determined by testing equipment which is able to test great specimen adequately. Specimen, which is too strong and big, cannot be tested in a low capacity testing machine. And it is impossible to test tao small specimen in a high load capacity testing machine. Testing of material properties of specimen is suitable in equipment with strength capacity from 2 to 5 tiljlleS higher than specimen's strength. 2. PREPARING THE TESTSSpecimens with strength of 60 MPa were tested in compression tests and Brazilian tests. We used equipment DSM 2500. This is hydraulic testing machine with maxima! compress capacity of2500 kN. ln order to obtain post peak curve we need following parts of machine: - Stiff machine frame- Electronic and ťast control system- Hydraulic load system- Control thé test by defonnation of specimeos146 

Mechanical properties of 60MPA strength concrete

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Mechanical properties of 60MPA strength concrete

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