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（大連理工大學(xué)海岸和近海工程國家重點實驗室 116024）
【提要】 按照國際標(biāo)準(zhǔn)對新型仿鋼絲聚丙烯合成長纖維增強高性能混凝土的工作度、含氣量、強度及彎曲韌性進(jìn)行了試驗研究。其中對該纖維混凝土的彎曲韌性按照國際材料與結(jié)構(gòu)聯(lián)合會（RILEM）標(biāo)準(zhǔn)進(jìn)行了研究，同時還對比了鋼纖維混凝土及新型聚丙烯長纖維與鋼纖維混雜時纖維混凝土的韌性，得出了不同纖維混凝土的能量吸收值和等效抗彎強度，探討了新型聚丙烯長纖維部分取代鋼纖維的可能性。試驗表明，該纖維具有很好的增韌效果，可以部分取代鋼纖維來達(dá)到增韌增強和降低成本的目的。
【關(guān)鍵詞】 高性能混凝土 聚丙烯長纖維 混雜纖維 彎曲韌性
Experimental Study on Mechanical Behaviour of Modified Macro Polypropylene Fiber Reinforced High Performance Concrete/Cao Jifeng, Ding Yining (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Tec~hno~logy, Dalian 116024, China)Abstract:The experimental results for workability, air content, compressive strength and flexural toughness of modified macro polypropylene fiber reinforced high performance concrete are presented. The experiments have been carried out according to different international guidelines. The flexural toughness has been deeply analyzed according to RILEM guidelines. The toughness of beams with steel fiber reinforcement and with hybrid fiber reinforcement has been compared. The energy absorption capacity and equivalent flexural strength have been calculated. The results show that modified macro polypropylene fiber can obviously enhance the flexural toughness of concrete and partially replace steel fiber, increase the flexural toughness and reduce the cost.
Keywords:high performance concrete; macro polypropylene fiber; hybrid fiber; flexural toughness
