铁尾矿砂制备活性粉末混凝土的试验研究  

Experimental study on preparation of reactive powder concrete from iron tailings

作　　者：王晨光 张立群[1] 刘宏波[1] 游宇澄 王子艺 WANG Chenguang;ZHANG Liqun;LIU Hongbo;YOU Yucheng;WANG Ziyi(Hebei University of Architecture,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第1期28-33,共6页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：河北省高校2022年基本科研业务费项目(2022CXTD01);河北省建设科技研究计划项目(2020-266);河北建筑工程学院博士基金项目(B-202103)。

摘　　要：为了制备活性粉末混凝土(RPC),将铁尾矿砂代替石英砂,粉煤灰替代部分硅灰,并分别采用28d标准养护和3d高温蒸汽养护两种养护方式对其进行养护。试验结果表明,粉煤灰取代量在20%~40%范围内,替代率增加,混凝土的抗压强度先增大后减小,在粉煤灰取代量为35%时,RPC强度达峰值,随后降低;钢纤维掺量在0~1.5%范围内,掺量增加,混凝土的抗压强度增大;减水剂掺量在2%~5%范围内,掺量增加,混凝土的抗压强度增大;高温养护能显著提高混凝土抗压强度。Reactive powder concrete(RPC)was prepared by replacing quartz sand with waste iron tailings,and part of silica fume was replaced with fly ash,which was cured by standard curing for 28 days and high temperature steam curing at 90℃for 3 days.The test results show that when the replacement rate of fly ash is in the range of 20%~40%,the replacement rate increases and the compressive strength of concrete increases.When the content of steel fiber is in the range of 0~1.5%,the compressive strength of concrete increases with the increase of the content.When the dosage of water reducing agent is in the range of 2.5%~5%,the compressive strength of concrete increases with the increase of dosage.High temperature curing can significantly improve the compressive strength of concrete.

关 键 词：铁尾矿砂 活性粉末混凝土 配合比 立方体抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]