粉煤灰改性固体废弃物胶固粉的制备及性能研究  

Preparation and performance study of fly ash modified solidwaste cementitious powder

作　　者：方明伟[1] 李荣杰 王丹[1] 周枫桃[1] 闻洋 FANG Mingwei;LI Rongjie;WANG Dan;ZHOU Fengtao;WEN Yang(School of Architecture and Engineering,Hulunbuir University,Hulunbuir 021008,China;School of Mechanical Engineering,Inner Mongolia University of Science&Technology,Baotou China,014017)

机构地区：[1]呼伦贝尔学院建筑工程学院,内蒙古呼伦贝尔021008 [2]内蒙古科技大学机械工程学院,内蒙古包头014017

出　　处：《功能材料》2024年第1期1158-1164,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(51768056);内蒙古自治区重点研发和成果转化计划项目(2022YFDZ0085);内蒙古自治区高等学校科学技术研究项目(NJZY22294);呼伦贝尔学院校级服务地方重点项目(2022FDZD03)。

摘　　要：以电石渣和粉煤灰这两类固体废弃物为主要原料,制备了不同粉煤灰掺量的固体废弃物胶固粉。研究了粉煤灰掺杂比例对胶固粉水化进程、微观形貌、破坏形态和力学性能等方面的影响。结果表明,掺入适量粉煤灰后加速消耗了水泥熟料,提高了胶固粉的水化反应速率,在28 d龄期下,当粉煤灰的掺量为30%(质量分数)时,胶固粉中孔隙数量最少,结构密实度最高。胶固粉在受力过程中破坏形态相似,裂纹自上而下均为条形裂纹,且上部出现了坍塌现象。随着粉煤灰掺量的增大,胶固粉的凝结时间逐渐增大,流动度和化学结合水量持续降低,抗压强度和最大应力先增大后降低变化。在28 d龄期下,当粉煤灰的掺量为30%(质量分数)时,胶固粉的抗压强度最大为14.85 MPa,在相同应变下的应力最高为15.70 MPa。分析可知,粉煤灰的最佳掺量为30%(质量分数)。Two types of solid waste,carbide slag and fly ash,were used as the main raw materials to prepare solid waste cementitious powders with different fly ash dosages.The influence of fly ash doping ratio on the hydration process,microstructure,failure morphology,and mechanical properties of cementitious powder was studied.The results showed that the addition of an appropriate amount of fly ash accelerated the consumption of cement clinker and increased the hydration reaction rate of the cementitious powder.At the age of 28 d,when the content of fly ash was 30wt%,the number of pores in the cementitious powder was the least and the structural density was the highest.The failure morphology of the cementitious powder during the stress process was similar,and the cracks were strip cracks from top to bottom,and there was a collapse phenomenon in the upper part.As the doping amount of fly ash increased,the setting time of the cementitious powder gradually increased,the fluidity and chemically bound water content continue to decreased,and the compressive strength and maximum stress changes first increased and then decreased.At the age of 28 d,when the doping amount of fly ash was 30wt%,the maximum compressive strength of the cementitious powder was 14.85 MPa,and the maximum stress at the same strain was 15.70 MPa.Analysis shows that the optimal doping amount of fly ash is 30wt%.

关 键 词：粉煤灰 固体废弃物 胶固粉 水化反应 力学性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]