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Loại tài liệu:
Article
Tác giả:
Hou, P.
Đề mục:
Case Studies in Construction Materials
Nhà xuất bản:
Elsevier Ltd.
Ngày xuất bản:
2014
Định dạng:
pdf
Nguồn gốc:
Case Studies in Construction Materials, Volume 1, 2014, Pages 154-163
Ngôn ngữ:
eng
Lượt xem:
1
Lượt tải:
0

Nội dung

The recognition of gradient features of the properties of in situ concrete is important for the interpretation/prediction of service life. In this work, the gradient features: water absorption, porosity, mineralogy, morphology and micromechanical properties were studied on two in situ road concretes (15 and 5 years old, respectively) by weighing, MIP, XRD, IR, SEM/EDS and micro-indentation techniques. Results showed that a coarsening trend of the pores of the concrete leads to a gradual increase of liquid transport property from inside to outside. Although the carbonation of the exposed surface results in a compact microstructure of the paste, its combined action with calcium-leaching leads to a comparable porosity of different concrete layers. Moreover, the combining factors result in three morphological features, i.e. a porous and granular exposed-layer, a fibrous and porous subexposed-layer and a compact inner-layer. Micro-indentation test results showed that a hard layer that moves inward with aging exists due to the alterations of the mineralogy, the pore and the gel structure.

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