CAJ | 학술논문

以橡胶钢纤维再生骨料混凝土( crumb rubber and steel fiber reinforced recycled aggregate con-crete, RSRAC)为研究对象,探讨橡胶掺量对其断裂性能的影响。设计了6组试件,包括5组不同配合比的RSRAC (橡胶体积分数分别为0、4%、8%、12%和16%)和1组不含橡胶的钢纤维原生骨料混凝土试件,每组含3个尺寸为100 mm ×100 mm ×515 mm带切口的小梁试件。基于三点弯曲断裂试验,得到了RS-RAC的荷载-挠度曲线和荷载-裂缝张开位移曲线,通过计算RSRAC的断裂能和断裂韧度,分析了RSRAC断裂能和断裂韧度随橡胶掺量的变化规律。结果表明, RSRAC断裂能和断裂韧度随橡胶颗粒掺量的增加呈先增后减趋势,细骨料体积取代率为8%时,橡胶掺量可使RSRAC材料获得较好的断裂性能。
이상효강섬유재생골료혼응토( crumb rubber and steel fiber reinforced recycled aggregate con-crete, RSRAC)위연구대상,탐토상효참량대기단렬성능적영향。설계료6조시건,포괄5조불동배합비적RSRAC (상효체적분수분별위0、4%、8%、12%화16%)화1조불함상효적강섬유원생골료혼응토시건,매조함3개척촌위100 mm ×100 mm ×515 mm대절구적소량시건。기우삼점만곡단렬시험,득도료RS-RAC적하재-뇨도곡선화하재-렬봉장개위이곡선,통과계산RSRAC적단렬능화단렬인도,분석료RSRAC단렬능화단렬인도수상효참량적변화규률。결과표명, RSRAC단렬능화단렬인도수상효과립참량적증가정선증후감추세,세골료체적취대솔위8%시,상효참량가사RSRAC재료획득교호적단렬성능。
This paper addresses the fracture behavior of crumb rubber and steel fiber reinforced recycled aggregate concrete ( RSRAC) . An experimental study was conducted on the effects of rubber content on the fracture behaviors of RSRAC. 6 specimens of 150 mm × 150 mm × 515 mm were cast, including five RSRAC groups with different ratio of rubber content (rubber content being respectively 0, 4%, 8%, 12% and 16% by volume substitution of sand) and one group nature aggregate concrete ( NAC) without rubber. Each group contained three specimens. Based on a three-point bending test, the curves of load-deflection and load-crack mouth opening displacement were obtained, and both the fracture toughness and fracture energy were calculated. The results indicate that both the fracture tough-ness and fracture energy firstly increases and then decreases with the increase of the rubber content, and the rubber content is recommended to be 8% to provide the better fracture behavior for RSRAC.