哈尔滨工程大学学报2024，Vol.45Issue(6)：1217-1224,8.DOI:10.11990/jheu.202203010
不同养护方式对铁尾矿砂制备的再生粗骨料性能影响
Effects of different curing methods on the properties of recycled coarse aggregate prepared from iron tailings sand
摘要
Abstract
To improve the utilization rate,the pelletizing technology was adopted to prepare coarse aggregate from i-ron tailings sand.The iron tailings sand,after interface pretreatment,was sprayed with a pretreatment liquid of water mist,which was mixed with cementitious materials to generate aggregate particles.Finally,the aggregate particles were cured to obtain recycled coarse aggregate.Moreover,the effects of different curing methods on the properties of recycled coarse aggregate were explored,and the effect of curing methods on the micromorphology and pore structure of recycled coarse aggregate was additionally explored by combining SEM and MIP.Results showed the feasibility of using the improved pelletizing technology to prepare recycled coarse aggregate of iron tailings sand.Moreover,the performance of aggregates under natural curing conditions was the worst,the crushing index of steam curing aggre-gates was the smallest,and the water absorption of carbonated curing aggregates was the smallest.In terms of micro-structure,the aggregate system cured by carbonization had a dense structure,relatively few pores,and microcracks.Therefore,the water absorption of aggregate was the smallest;the hydration product of steam curing contained a large amount of calcium silicate hydrate with gelatinous and netlike structures,needle-like ettringite,and a small amount of calcium hydroxide crystals;The crushing index was small.These findings guide the preparation of recycled coarse aggregate from iron tailings sand and its application in the subsequent service of concrete.关键词
铁尾矿沙/再生粗骨料/养护方式/利用率/微观结构/压碎指标/吸水率/混凝土Key words
iron tailings sand/recycled coarse aggregate/curing methods/utilization rate/microstructure/crushing index/water absorption/concrete分类
建筑与水利引用本文复制引用
刘宝,潘钢华,高敏,蒙海宁..不同养护方式对铁尾矿砂制备的再生粗骨料性能影响[J].哈尔滨工程大学学报,2024,45(6):1217-1224,8.基金项目
国家自然科学基金项目(52078124) （52078124）
国家留学基金委公派研究生项目(202106090117) （202106090117）
江苏省自然科学基金项目(BK20221290). （BK20221290）
