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STUDY ON MATERIAL'S FRACTURE MECHANICAL PROPERTIES BASED ON NEW REACTIVE POWDER CONCRETE
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摘要: 以粉煤灰代替磨细石英粉末，配制了两个系列的RPC试件并研究聚丙烯纤维掺量以及养护制度对其断裂力学性能的影响。结果表明:粉煤灰取代石英粉以较少的减水剂就能达到良好的工作性能，且辅以热水养护，其极限荷载有所提高，但是其断裂能和延性指数却降低了。试验研究的同时给出了在一定的水胶比和标准养护条件下，其断裂能、延性指数和断裂韧度等参数随纤维体积掺量变化的规律。Abstract: Two types of reactive powder concrete( RPC) were prepared by substition of fly- ash for fine quartz sand. The effects of volume fraction of polypropylene fibres and curing conditions on the fracture properties of RPC were studied. The results showed that the good workability can be got by less water reducer and ultimate load was increased, but the fracture energy and ductility index es were decreased with the replacement of fly- ash for fine quartz sand. The study also showed that on the same conditions, the effects on the fracture energy and ductility and fracture toughness are varied with the increase of fibre.
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Key words:
- reactive powder concrete /
- fly ash /
- percentage of fibre /
- fracture toughness /
- ductile index
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Mareel Cheyrezy. Structural Applications of RPC. Concrete, 1999(1):20～23 [2] 朱航征.活性粉末混凝土的开发与应用.福建技术开发,2002,29(1):61～64 [3] 何雁斌,吴炎海,等.活性粉末混凝土(RPC200)的材料选用及制作技术.福建建筑,2003(10):70～72 [4] CECS 13-89 钢纤维混凝土的试验方法 [5] 蔡四伟,蔡敏.混凝土的损伤断裂.北京:人民交通出版社,1999 [6] 尹双增.断裂判据与在混凝土工程中应用.北京:科学出版社,1996 [7] 吴智敏,徐世烺,等.三点弯曲梁法研究混凝土的双K断裂参数以及尺寸效应.水利发电学报,2004(4):16～24 [8] 徐世烺,赵国藩.混凝土窄条断裂区模型及其应用.大连理工大学学报,1993,33(1):57～64 [9] 中国航空研究院.应力强度因子手册.北京:科学出版社,1991 [10] 吴智敏,王金来.基于虚拟裂缝模型的混凝土的等效断裂韧度.工程力学,2002,17(1):99～10 -
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