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纤维品种和掺量对混凝土抗冻性及微观结构的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2010年05期
Page:
91-95
Column:
研究论文
publishdate:
2010-10-08

Article Info:/Info

Title:
Effects of fiber types and contents on frost resistance of concrete and their microstructure
Author(s):
DONG Xiang SHEN Zheng
School of Civil Engineering and Architecture, Nanjing Institute of Technology, Nanjing 211167, China
Keywords:
high performance concrete frost resistance microstructure steel fiber polypropylene fiber fiber content
Classification number :
TU528.572
DOI:
10.3969/j.jssn.1000-2006.2010.05.020
Document Code:
A
Abstract:
Effects of adding steel fibers and polypropylene fibers into C50 high performance concrete and different fiber contents on frost resistance of concrete were investigated by fast frost test. The microstructures of fibermatrix interface zones were observed by using scanning electron microscopy, so that the results of macrofrost tests were analyzed from the microstructure point of view. Results showed that by adding polypropylene fibers, the improving effects on frost resistance of concrete was better than by adding steel fibers, although the latter was of better microstructures of fibermatrix interface zone. When adding polypropylene fibers into concrete, there were double effects including, which was crack resistance effect and weak interface zone effects, so that the optimum fiber volume content existed. Adding 1.0 % polypropylene fibers into concrete could achieve the best improving effect of frost resistance, and the relative dynamic elastic modulus was high to 9801 % after 300 times of freezethaw cycles.

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Last Update: 2010-10-08