摘要
针对传统铁尾矿陶粒混凝土力学强度较低的问题,通过纳米二氧化硅对陶粒混凝土进行改性,并对改性后混凝土力学性能进行研究。试验结果表明,最高掺量条件下纳米二氧化硅改性铁尾矿陶粒混凝土最小坍落度和扩展度分别为177、376 mm,铁尾矿陶粒不出现上浮现象;在所有掺量范围内,混凝土表面密度均未超过1 950 kg/m^(3),表现出良好的工作性能。当养护龄期为28 d时,纳米二氧化硅掺量为0.3%的改性铁尾矿陶粒混凝土抗压强度最高为52.8 MPa,较普通陶粒混凝土提升了约16.8%;劈裂强度为3.69 MPa,较普通陶粒混凝土提升了约26%,具备良好的性能。
In response to the problem of low mechanical strength of traditional iron tailings ceramsite concrete,nano silica was used to modify ceramsite concrete,and the mechanical properties of the modified concrete were studied.The experimental results showed that under the highest concentration conditions,the minimum slump and expansion of nano silica modified iron tailings ceramsite concrete were 180 mm and 385 mm,respectively.The iron tailings ceramsite did not show any upward floating phenomenon;Within all dosage ranges,the surface density of concrete did not exceed 1 950 Kg/m^(3),demonstrating a good working performance.When the curing period was 28 days,the compressive strength of the modified iron tailings ceramsite concrete with a content of 0.3% nano silica reached a maximum of 52.8 MPa,which was about 16.8% higher than that of ordinary ceramsite concrete;The splitting strength was3.69 MPa,which was about 26% higher than ordinary ceramsite concrete,showing a good performance.
作者
程兴旺
张超
冉旭勇
韩军昭
CHENG Xingwang;ZHANG Chao;RAN Xuyong;Han JunZhao(Department of Civil Engineering,Shaanxi Polytechnic Institute,Xianyang712000,ShanxiChina;China Construction Steel Structure Corporation Ltd,Chengdu620564,China)
出处
《粘接》
CAS
2023年第10期90-93,共4页
Adhesion
基金
陕西工业职业技术学院科研项目(项目编号:2022YKYB-015)。
