1 安徽理工大学土木建筑学院, 淮南 232001
2 安徽理工大学矿山地下工程教育部工程研究中心, 淮南 232001
为提高工业废渣的综合利用率, 研制出一种绿色环保高性能的注浆材料。选用超细矿渣粉(UFS)和硅灰(SF)替代一定量的水泥, 通过正交试验和极差分析法系统地研究了在不同水灰比下掺入不同含量的超细矿渣粉、硅灰以及聚羧酸减水剂(PCE)对注浆材料性能的影响, 并对优化后的浆液和纯水泥浆液进行了性能对比及微观试验。结果表明: 当超细矿渣粉质量分数从18%增大到20%时, 可以增强浆液流动性能, 硅灰可以提高结石体抗压强度并减小浆液泌水率, 聚羧酸减水剂对降低浆液黏度具有显著效果; 以28 d抗压强度和黏度为主要指标, 得到浆液的较优配比为水灰比0.70、超细矿渣粉掺量20%（质量分数）、硅灰掺量12%（质量分数）、聚羧酸减水剂掺量0.16%（质量分数）。优化后的浆液泌水率、抗压强度及抗折强度均优于纯水泥浆液。掺入超细矿渣粉和硅灰后, 浆液内部生成了钙矾石（AFt）和水化硅酸钙（C-S-H）等凝胶, 填充了颗粒间的孔隙, 使优化后的浆液结石体强度增大。
注浆材料 泌水率 黏度 流动度 抗压强度 微观结构 grouting material bleeding rate viscosity fluidity compressive strength microstructure
Author Affiliations
Abstract
1 Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
2 Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
3 AICFVE of Beijing Film Academy, Beijing 100088, China
4 e-mail: liusir@bit.edu.cn
Lead halide perovskites have drawn extensive attention over recent decades owing to their outstanding photoelectric performances. However, their toxicity and instability are big issues that need to be solved for further commercialization. Herein, we adopt a facile dry ball milling method to synthesize lead-free (, Cl) perovskites with photoluminescence (PL) quantum yield up to 60%. The optical features including broad emission spectrum, large Stokes shift, and long PL lifetime can be attributed to self-trapped exciton recombination. The as-synthesized blue emissive and green emissive lead-free perovskite powders have good thermal stability and photostability. Furthermore, UV-pumped phosphor-converted light-emitting diodes were obtained by using and as phosphors.
Photonics Research
2020, 8(6): 06000768
