THE SPECIAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE (UHPC)
References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-38-4 / ISSN 1314-2704, June 18-24, 2015, Book4, 771-778 pp
Ultra–High Performance Concrete (UHPC) is a special material with an ultra–compact matrix and outstanding physical and mechanical properties, such as: compressive strength greater than 150 MPa, tensile strength greater than 7 MPa, low permeability, and by addition of steel fibers, an enhanced ductility. An ultra–high performance concrete tested on compression can resist without damages up to 80% from its strength, unlike a normal concrete which resist only 60%. The behavior at direct tensile of these concretes reinforced with steel fibers is characterized by four zones specific to elastic and plastic behavior. Modulus of Ultra–High Performance Concrete can reach up to 60 GPa for concretes with compressive strength of 200 MPa. Creep of UHPC can occurred by following mechanisms: the gels resulted from cement moisture, under loading, suffer a viscous creep; the gels between micro-cracks changes from a low viscous to a high one, resulting a creep in time closed to zero; creep explained by water infiltration from gels in capillary spaces and possibly vanished in exterior under the external pressure; The shrinkage in case of UHPC is divided in three components: drying shrinkage, autogenously shrinkage and carbonation shrinkage. The special mechanical properties ensure a long service life, reducing maintenance costs. Also, the ductile behavior of this concrete provide the possibility of using in arias with high seismic risk.
Keywords: applications, physical and mechanical properties, durability.
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