Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of moisture content of concrete on water uptake
The penetration of water and non-polar hexane in Portland cement mortar prisms with different initial moisture contents was investigated using nuclear magnetic resonance (1H NMR). The amount of water in gel pores strongly affects the penetration of water in much larger capillary pores. Water penetration is reduced by the self-sealing effect as characterized by non-SQUARE ROOT t dependence of capillary uptake and penetration depth. This is explained by the ongoing redistribution of water from capillaries into gel pores which results in internal swelling and loss of continuity of the capillary pore system; a correlation was observed between the amount of redistributed water and departure from SQUARE ROOT t behaviour. A descriptive model is used to explain the dependence of water uptake and penetration on moisture content. For increasing initial moisture contents up to a critical value equivalent to equilibrium with a relative humidity between 65 and 80%, less penetrating water is able to redistribute. Thus more penetrating water is in larger capillaries with less viscous resistance; uptake and penetration depth increase. Above the critical initial moisture content, uptake and penetration depth decrease towards zero. This is explained by (a) an overall reduction in capillary pressure because transport takes places in fewer and larger pores and (b) an increase in viscous resistance due to the connection of penetrating capillary water with pores already containing water. Less capillary pore space is available for transport. The surface region of concrete placed in contact with water is not instantaneously saturated. Water content increases with time depending on the degree of surface saturation. A new transition coefficient for capillary suction gamma is defined for the calculation of surface flux.
Effect of moisture content of concrete on water uptake
The penetration of water and non-polar hexane in Portland cement mortar prisms with different initial moisture contents was investigated using nuclear magnetic resonance (1H NMR). The amount of water in gel pores strongly affects the penetration of water in much larger capillary pores. Water penetration is reduced by the self-sealing effect as characterized by non-SQUARE ROOT t dependence of capillary uptake and penetration depth. This is explained by the ongoing redistribution of water from capillaries into gel pores which results in internal swelling and loss of continuity of the capillary pore system; a correlation was observed between the amount of redistributed water and departure from SQUARE ROOT t behaviour. A descriptive model is used to explain the dependence of water uptake and penetration on moisture content. For increasing initial moisture contents up to a critical value equivalent to equilibrium with a relative humidity between 65 and 80%, less penetrating water is able to redistribute. Thus more penetrating water is in larger capillaries with less viscous resistance; uptake and penetration depth increase. Above the critical initial moisture content, uptake and penetration depth decrease towards zero. This is explained by (a) an overall reduction in capillary pressure because transport takes places in fewer and larger pores and (b) an increase in viscous resistance due to the connection of penetrating capillary water with pores already containing water. Less capillary pore space is available for transport. The surface region of concrete placed in contact with water is not instantaneously saturated. Water content increases with time depending on the degree of surface saturation. A new transition coefficient for capillary suction gamma is defined for the calculation of surface flux.
Effect of moisture content of concrete on water uptake
Rucker-Gramm, P. (Autor:in) / Beddoe, R.E. (Autor:in)
Cement and Concrete Research ; 40 ; 102-108
2010
7 Seiten, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
Abdichtung (Abdichten) , Anwender-Software , Betonmörtel , Eindringtiefe , Feuchtegehalt , Hexan , Kapillardruck , Kapillarwasser , kritischer Wert , Luftfeuchte , magnetische Kernresonanz , magnetische Kernresonanzspektroskopie , Portlandzement , relative Feuchtigkeit , Transporteigenschaft , Wasseraufnahme , Wasseraufnahmevermögen , Wasserdurchlässigkeit , Zeitabhängigkeit , Zementmörtel
Effect of moisture content of concrete on water uptake
| British Library Online Contents | 2010
Effect of moisture content of concrete on water uptake
| Online Contents | 2010
Effect of moisture content on concrete
Engineering Index Backfile | 1922
Engineering Index Backfile | 1929
Effect of Moisture Content on Water Transport in Silica Fume Concrete
| Online Contents | 2000