短切碳纤维混凝土的力学强度实验与分析  

Experiments and Analysis on Mechanical Strength of Carbon Fiber Reinforced Concrete

作　　者：佟钰[1] 田鑫[1] 朱长军[1] 曾尤[2] 牛晚杨[1] 王晴[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,沈阳110168 [2]中国科学院金属研究所,沈阳110016

出　　处：《硅酸盐通报》2015年第8期2281-2285,2297,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家十二五科技支撑重点项目(2012BAJ17B01)

摘　　要：为探究短切碳纤维对混凝土力学强度的影响机制,以C40和C50矿渣水泥混凝土为研究对象,考察了短切碳纤维长度和掺量对混凝土的抗压强度、劈裂抗拉强度和抗折强度的影响规律,特别是与不掺纤维混凝土的强度对比。实验结果表明,碳纤维的加入可使混凝土的力学强度有不同程度的提高,其中以抗折强度的增长最为明显,劈拉强度次之,而抗压强度比的增幅相对最小,在高纤维掺量时抗压强度甚至低于不掺纤维混凝土;纤维长度的增大对混凝土的力学强度增长更为有利,在低强度等级(C40)混凝土中的表现更为明显。力学分析认为,随机分布的短切碳纤维可显著提高混凝土对劈裂或弯折式破坏的抵抗作用,但对受压时所发生的剪切式破坏却难以发挥明显效果。In order to clarify the influence of carbon fiber （CF） on the mechanical strength of concrete, CF in different length and fiber content was introduced into the C40 and C50 concrete, respectively, of which compressive strength , splitting tensile strength and flexural strength were investigated and compared with that of original concrete. The alternations of strength ratio show that the involvement of CF results in an evident improvement to the mechanical strength of concrete; while the highest ratio was found from the improvement of the flexural strength, the lowest ratio of the compressive strength was also observed, which even gave rise of a lowered compressive strength under high content of CF in comparison with that of original concrete. The increasing of fiber length is benefit for the strengthening effect of CF in concrete, but the lowering of water/cement ratio does not generate an apparent enlargement of the strength ratio. The experimental results suggest that the introduction of CF in appreciable content can make an evident contribution to improve the mechanical strength of concrete, especially tensile and flexural strength, since the CF is of great resistance to the tensile stress, but is less efficiency to prevent deflection.

关 键 词：碳纤维 混凝土 力学强度 强度比 

分 类 号：TU528[建筑科学—建筑技术科学]