期刊
CEMENT AND CONCRETE RESEARCH
卷 34, 期 9, 页码 1633-1644出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-8846(03)00229-1
关键词
heating; in situ neutron diffraction; microstructure changes; cement paste; fire simulation
Composition and microstructure changes of cement pastes when heating until 620 degreesC and cooling afterwards have been monitored on site by neutron diffraction. The parameters involved in the study have been the heating ramp, the state of the sample (in block or ground) and the type of cement. The residual state of the samples has also been studied by mercury intrusion porosimetry (MIP) and thermogravimetry analysis (TGA). As a result, it has been possible to monitor the major features of the experiments, i.e., the phases existence domains and their growing and decaying for portlandite, ettringite, calcite, lime, lamite, and hydrated calcium silicate (CSH gel), as well as the loss of free and bounded water during the experiments. In addition, the different residual phases in the matrix depending on the experimental set up have been established, which might have a significant influence in the durability of a concrete after a fire. (C) 2003 Elsevier Ltd. All rights reserved.
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