摘要
采用碎石型高强页岩陶粒制备了不同纤维类型和体积分数的LC60级纤维增韧高强轻骨料混凝土,研究了其力学性能,并从微观尺度揭示了纤维增韧机理.结果表明:高强轻骨料混凝土界面的黏结性能优于普通混凝土;纤维能够有效阻止高强轻骨料混凝土裂缝的发展,还可适当提高其抗压强度,并明显提高其抗折强度和劈裂抗拉强度,起到增强增韧的作用;钢纤维与水泥浆体的黏结性能良好,碳纤维可在高强轻骨料混凝土中均匀分散且与水泥浆体的黏结性能良好;相同体积分数下,碳纤维的增韧作用优于钢纤维.
The crushed shale ceramist was used to prepare LC60 high-strength lightweight aggregate concrete(HLWAC) specimens containing various types of fibers and different fiber volume fractions. Their mechanical properties were studied and the fiber reinforcement mechanism was clarified from microscopic viewpoint. The experimental results show that bonding characteristic between aggregates and cement paste of HLWAC is much superior to that of normal weight concrete. The splitting tensile strength and flexural strength are enhanced while no obvious effect on compressive strength is found. The reinforcement of fibers in HLWAC can be attributed to its bridging mechanism which can impede the development of cracks. Furthermore, the improvement provided by carbon fibers proves to be better than that provided by steel fibers.
作者
刘喜
吴涛
杨雪
魏慧
李鹏志
LIU Xi;WU Tao;YANG Xue;WEI Hui;LI Pengzhi(School of Civil Engineering, Chang an University, Xi an 710061, China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2019年第5期700-706,713,共8页
Journal of Building Materials
基金
国家自然科学基金资助项目(51878054,51578072,51708036)
陕西省自然科学基金资助项目(2017JQ5092)
中央高校基本科研业务费专项资金资助项目(300102288401)
关键词
高强轻骨料混凝土
纤维增韧
力学性能
微观结构
脆性
high-strength lightweight aggregate concrete
fiber reinforcement
mechanical property
microstructure
brittleness
