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Research on the seismic behavior of HPC shear walls after fire



Title: Research on the seismic behavior of HPC shear walls after fire
Author(s): J.-Z. Xiao, J. Li, F. Jiang
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 37
Issue: 272
Issue date: 2004-10-01
Publication year: 2004
Pages: 506 - 512
Total Pages: 7
Nb references: 13
Language: English


Abstract: Adequate moisture is very important during early age of portland cement concrete.
The Single Point Magnetic Resonance Imaging technique was used to study the effects of various lengths of moist curing, and the use of curing compound, on the amount and distribution of evaporable water during drying of ordinary and high performance concrete.
The specimens subjected to six different curing regimes, were cast in triplicate for a total of 72.
After moist curing at 38oC, the specimens were subjected to uniaxial drying in an environmental chamber at 38oC and 40% relative humidity that simulated hot dry climate conditions.
As the specimens were drying, Magnetic Resonance Imaging was used to study the evaporable water distribution, non-destructively and with millimetric resolution.
The Magnetic Resonance Imaging profiles indicated a reduced moisture loss with increasing length of moist curing.
Extended moist curing was especially beneficial for the two self-compacting concrete mixtures, particularly for the cover concrete.
In all mixtures the use of curing compound was only marginally better than one day moist curing, but was significantly better than air curing, particularly for the cover concrete.
The moisture diffusivity was evaluated from the transient moisture distribution profiles using the Boltzmann transformation method.
The results indicated a strong dependence of the moisture diffusivity on the moisture content when above 80% saturation, whereas below this value it remains almost constant.
The moisture diffusivity is significantly reduced with increased moist curing period.


Online publication: 2004-08-17
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13969


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