Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Modelling of capillary suction of water in self-compacting concrete
Self-compacting concrete (SCC) was developed in Japan in the 1980's. The aim was to develop a concrete with a high flowability and a high resistance to segregation, so that it could be placed without vibration. In this way, durability problems related with badly vibrated concrete would be reduced. The high flowability is obtained by the use of superplasticizers and a high amount of fine particles. Due to the presence of this high amount of fine particles, the pore structure is differing from the pore structure of traditional concrete. Because the pore structure is one of the major influencing factors concerning durability, the actual application of SCC might be somewhat riskfull due to the lack of knowledge concerning the actual durability of the new cementitious material. In this paper capillary absorption tests, carried out on 16 SCC and 4 traditional concrete mixtures (TC), will be discussed. Four types of cement (portland cement and blast furnace s!ag cement), three types of filler (fly ash and two types of limestone filler with a different grading curve) and two types of coarse aggregate are used and the influence of the amount of powder (cement and filler) and the amount of water is studied. A new model for the mass increase and height of capillary rise due to capillary absorption is proposed, based on the capillary porosity. This model is giving good results, both for traditional concrete and self-compacting concrete.
Modelling of capillary suction of water in self-compacting concrete
Self-compacting concrete (SCC) was developed in Japan in the 1980's. The aim was to develop a concrete with a high flowability and a high resistance to segregation, so that it could be placed without vibration. In this way, durability problems related with badly vibrated concrete would be reduced. The high flowability is obtained by the use of superplasticizers and a high amount of fine particles. Due to the presence of this high amount of fine particles, the pore structure is differing from the pore structure of traditional concrete. Because the pore structure is one of the major influencing factors concerning durability, the actual application of SCC might be somewhat riskfull due to the lack of knowledge concerning the actual durability of the new cementitious material. In this paper capillary absorption tests, carried out on 16 SCC and 4 traditional concrete mixtures (TC), will be discussed. Four types of cement (portland cement and blast furnace s!ag cement), three types of filler (fly ash and two types of limestone filler with a different grading curve) and two types of coarse aggregate are used and the influence of the amount of powder (cement and filler) and the amount of water is studied. A new model for the mass increase and height of capillary rise due to capillary absorption is proposed, based on the capillary porosity. This model is giving good results, both for traditional concrete and self-compacting concrete.
Modelling of capillary suction of water in self-compacting concrete
Modellierung des Kapillardruckes des Wassers in selbstverdichtendem Beton
Audenaert, K. (Autor:in) / Boel, V. (Autor:in) / Schutter, G. de (Autor:in)
2007
11 Seiten, 5 Bilder, 3 Tabellen, 9 Quellen
Aufsatz (Konferenz)
Englisch
SELF-COMPACTING CONCRETE - Self-compacting concrete
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Gas permeability and capillary porosity of self-compacting concrete
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Gas permeability and capillary porosity of self-compacting concrete
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Gas permeability and capillary porosity of self-compacting concrete
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