Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Long-time TDR measurements on subterranean concrete walls
The new building of the state library of Saxony, the state and the university libraries, the S.L.U.B., in Dresden in 1999 unites three libraries. This prestigious, award-winning library design by the architects Ortner and Ortner has a volume of 0.18 million m3 and about 90 % of it is underground. The building has three levels, and goes down to a depth of 12 m, 9 m below the average groundwater level. The subterranean, windowless building method initially resulted in drying problems. To monitor and plan of the drying of the S.L.U.B., it was necessary to measure the water content of the reinforced concrete elements. For this purpose, commercially available TDR probes were adapted and built in as the concrete was poured. Altogether, 40 TDR fork probes were measured intermittently each month over a period of 3 years. The water content was determined using a mixed dielectric 4-phase model, whereby the hydration of the concrete during setting was also taken into account as bound water. The quality of the concrete moisture measurement was verified by laboratory experiments. The individually measured concrete moisture levels of the wall elements in the base level of the S.L.U.B. are presented as examples. In addition, the drying process between the underground storeys and between the walls and ceilings is examined.
Long-time TDR measurements on subterranean concrete walls
The new building of the state library of Saxony, the state and the university libraries, the S.L.U.B., in Dresden in 1999 unites three libraries. This prestigious, award-winning library design by the architects Ortner and Ortner has a volume of 0.18 million m3 and about 90 % of it is underground. The building has three levels, and goes down to a depth of 12 m, 9 m below the average groundwater level. The subterranean, windowless building method initially resulted in drying problems. To monitor and plan of the drying of the S.L.U.B., it was necessary to measure the water content of the reinforced concrete elements. For this purpose, commercially available TDR probes were adapted and built in as the concrete was poured. Altogether, 40 TDR fork probes were measured intermittently each month over a period of 3 years. The water content was determined using a mixed dielectric 4-phase model, whereby the hydration of the concrete during setting was also taken into account as bound water. The quality of the concrete moisture measurement was verified by laboratory experiments. The individually measured concrete moisture levels of the wall elements in the base level of the S.L.U.B. are presented as examples. In addition, the drying process between the underground storeys and between the walls and ceilings is examined.
Long-time TDR measurements on subterranean concrete walls
Langzeit Zeitbereichs-Reflektometrie Messungen an unterirdischen Betonwänden
Plagge, R. (Autor:in) / Grunewald, J. (Autor:in)
2006
8 Seiten, 7 Bilder, 5 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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