钽铌尾矿砂玄武岩纤维混凝土的力学性能和微观分析  

Mechanical properties and microscopic analysis of tantalum niobium tailings basalt fiber concrete

作　　者：李海凤 彭杰 秦广付 郑吉卉 LI Haifeng;PENG Jie;QIN Guangfu;ZHENG Jihui(Linzhou Vocational and Technical College of Architecture,Linzhou 456500,China;Tianjin Hongtu Environmental EngineeringCo.Ltd.,Tianjin 300380,China;Housing and Urban Rural Development Bureau of Long'an District,Anyang 455500,China)

机构地区：[1]林州建筑职业技术学院,河南林州456500 [2]天津鸿图环境工程有限公司,天津300380 [3]安阳市龙安区住房和城乡建设局,河南安阳455500

出　　处：《新型建筑材料》2024年第3期155-158,共4页New Building Materials

摘　　要：采用钽铌尾矿砂替代部分河砂制备钽铌尾矿砂玄武岩纤维混凝土,研究了钽铌尾矿砂掺量对混凝土坍落度及泌水率、抗收缩及抗压、抗拉、抗弯强度的影响,并进行了微观测试和灰色理论分析。结果表明:钽铌尾矿砂掺量为20%的A20组混凝土初始坍落度最大,为190 mm;A20组的60 min泌水率较10 min时增大了150.0%,28 d收缩值较3 d时提高了10.4%,28 d抗压、抗拉、抗弯强度最高,力学性能最优;微观分析表明,养护28 d时,混凝土中有少量的AFt生成,填充了基体的微裂纹。Tantalum niobium tailings basalt fiber reinforced concrete was prepared when tantalum niobium tailings were partially used as a substitute for river sand,and the effects of tantalum niobium tailings content on the slump and bleeding rate,shrinkage resistance,compressive strength,tensile strength,and flexural strength of the concrete were studied,and microscopic testing and grey theory analysis were conducted.The results show that the slump of basalt fiber reinforced concrete with 20%tantalum niobium tailings is the highest,at 190 mm.The secretion rate of group A20 at 60 min increased by 150.0%compared to 10 min.The shrinkage value of group A20 during the 28 day maintenance period increased by 10.4%compared to 3 days.A20 has the highest compressive strength,tensile strength,and bending resistance at a curing age of 28 days,and the mechanical properties are optimal.When the curing age is 28 days,there is a small amount of Aft generated in the A20 group,which fills the microcracks of the matrix.

关 键 词：钽铌尾矿砂 玄武岩纤维混凝土 力学性能 微观测试 灰色关联度 

分 类 号：TU528.041[建筑科学—建筑技术科学]