摘要
研究了钢纤维体积分数对大流动度超高强钢纤维混凝土流动性、力学性能的影响;以单位体积混凝土极限应力时单位强度消耗的应变能为指标,对比了超高强钢纤维混凝土、超高强混凝土和普通混凝土的相对韧性;通过三点弯曲梁试验研究了钢纤维对超高强混凝土断裂能的影响.结果表明:超高强钢纤维混凝土的流动性随着钢纤维体积分数的增加而显著降低,当钢纤维体积分数不大于0.75%时,其坍落度可维持在200 mm以上;与超高强混凝土相比,超高强钢纤维混凝土的相对韧性和断裂能可分别提高1倍和34倍,显示出了其在结构工程中的应用前景.
Influence of volume fraction of steel fiber on the mechanical property and fluidity of high fluidity steel fiber reinforced ultra-high strength concrete were studied.The relative toughness,defined as strain energy of unit volume concrete consumed by unit strength at the point of the peak compressive strength,was compared between the ultra-high strength concrete,steel fiber reinforced ultra-high strength concrete and plain concrete.Moreover,the effect of steel fiber on fracture energy of ultra-high strength concrete was studied by threepoint bending beam test.The results show that the fluidity of steel fiber reinforced ultra-high strength concrete significantly reduces with the increase of volume fraction of steel fiber,and slump maintains over 200 mm when volume fraction of steel fiber is not more than 0.75%.Compared with ultra-high strength concrete,the relative toughness and fracture energy of steel fiber reinforced ultra-high strength concrete increase 1 and 34 times respectively which manifests the excellent application prospect in major structure.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2010年第1期1-6,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(50772071)
关键词
超高强混凝土
超高强钢纤维混凝土
相对韧性
断裂试验
断裂能
ultra-high strength concrete
steel fiber reinforced ultra-high strength concrete
relative toughness
fracture testing
fracture energy
