矿山废渣石掺入对3D打印建筑构件混凝土性能影响  

Effect of Mine Waste Slag Stone Incorporation on the Performance of 3D Printed Building Component Concrete

作　　者：余沛 许坤坤 YU Pei;XU Kunkun(School of Civil Engineering,Xinyang University,Xinyang 464000,China)

机构地区：[1]信阳学院土木工程学院,河南信阳464000

出　　处：《安阳工学院学报》2024年第6期76-81,共6页Journal of Anyang Institute of Technology

基　　金：河南省科技攻关项目“以矿山废渣石和麦秸秆稻草为基材的3D打印建筑构件关键技术及产业化”(242102320347)。

摘　　要：开发利用矿山废渣石会产生再生粗骨料、再生细骨料和再生粉料。通过试验研究了再生渣石微粉作为水泥与细骨料的部分替代材料对水泥砂浆及混凝土性能的影响,选取了2种类型的再生微粉(粉料A与粉料B),并分别以5%至20%的不同质量比例替代水泥或细骨料,引入NaOH、Ca(OH)_(2)和HCl作为激发剂,以探索最优的方案。试验结果表明:再生矿山微粉作为水泥替代,粉料B在低替代率时增强砂浆强度,替代率不断增加,7 d与28 d强度先升后降。在综合替代水泥和细骨料试验中,粉料A替代量为14%水泥和粉料B为20%细骨料时,7 d和28 d的抗压强度分别达到14.2 MPa和21.5MPa,相比最小替代量条件,后期强度增长较快,满足3D打印构件的要求。研究结果可为再生微粉在水泥砂浆与混凝土应用提供有益的参考,推动废弃物资源利用。Mining produces a large amount of waste slag stone,and the development and utilization of waste materials generate recycled coarse aggregate,recycled fine aggregate,and recycled powder.The effects of recycled slag powder as a partial substitute for cement and fine aggregate on the properties of cement mortar and concrete were studied through experiments.Two types of recycled fine powder(powder A and powder B)were selected and used to replace cement or fine aggregate at substitution ratios ranging from 5%to 20%.NaOH,Ca(OH)_(2) and HCl were introduced as activators to explore the best solution.The test results show that,as a substitute for cement,powder B enhances the mortar strength at low substitution rate.As the substitution rate increases,the strength of the mortar at 7 d and 28 d increases initially,then decreases.In the comprehensive replacement test,where powder A replaced 14%of the cement and powder B replaced 20%of the fine aggregate,the compressive strength at 7 d and 28 d reaches 14.2 MPa and 21.5 MPa,respectively.Compared to the minimum replacement amount,the later strength increases faster,meeting the requirements of 3D printing components.This study provides useful insights for the application of recycled micro-powder in cement mortar and concrete,and promotes the utilization of waste resources.

关 键 词：再生微粉 水泥砂浆 混凝土性能 废弃混凝土 微观形貌 

分 类 号：TU528[建筑科学—建筑技术科学]