期刊
SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS
卷 22, 期 6, 页码 649-657出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/secm-2014-0040
关键词
alkaline environment; basalt FRP; moisture; shear strength; tensile strength
资金
- National Basic Research Program of China (973 Program) [2012CB026200]
- National Twelfth Five-Year Plan for Science and Technology [2011BAB03B09]
- National Natural Science Foundation of China [51108074]
- Natural Science Foundation of Jiangsu Province, China [BK2010015]
This paper investigates the degradation of basalt fiber reinforced polymer (BFRP) bars used for concrete construction in an alkaline environment. The relationships between tensile strength, elastic modulus, shear strength and moisture absorption rate over time are analyzed using a tension test, short-beam test and moisture absorption weighting. The tensile strength degradation of BFRP bars was further compared with that of Glass FRP (GFRP) bars in the literature. The results indicated that BFRP bars exhibit relatively good resistance to alkaline corrosion, maintaining more than 60% of their original strength after 9 weeks at 55 degrees C in an alkaline solution. The moisture absorption of BFRP bars conforms to Fick's law, which shows that the degradation mechanism is controlled by matrix and related interface degradation. This finding is supported by comparison with the shear strength degradation trend. Compared to GFRP bars under similar alkaline conditions, BFRP bars exhibit a similar degradation rate during the initial phase, but maintain higher tensile strength and strength retention over time.
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