粉煤灰-矿渣基免烧人造轻集料的制备及性能研究  

Preparation and Properties of Fly Ash-Ground Granulated Blast Furnace Slag Based Artificial Lightweight Aggregate

作　　者：黄京立 侯杰 郑沛祺 王嘉伟 陶文宏[1] 段广彬[1] 张秀芝[1] HUANG Jingli;HOU Jie;ZHENG Peiqi;WANG Jiawei;TAO Wenhong;DUAN Guangbin;ZHANG Xiuzhi(School of Materials Science and Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学材料科学与工程学院,济南250022

出　　处：《材料导报》2024年第13期146-154,共9页Materials Reports

基　　金：国家自然科学基金(52178211);济南市新高校20条院所科研带头人工作室(2021GXRC087)。

摘　　要：为减轻对自然资源的开采,合理有效地利用粉煤灰(FA),本工作以FA和磨细粒化高炉矿渣(GGBFS)为原料制备了碱激发免烧人造轻集料(CAALA),研究了原材料配合比对CAALA的造粒效率、物理性能以及抗冻融性能的影响,并分析了CAALA的碱溶出。结果表明,FA掺量对CAALA的性能具有显著影响,当FA掺量增加,水化产物中C-A-S-H凝胶量减少,CAALA中有害孔(>200 nm)的占比增加;结合造粒效率与筒压强度,FA与GGBFS最佳质量比为1∶1,此时CAALA的造粒效率为92.01%、堆积密度为1072 kg/m^(3)、1 h吸水率为10.8%,筒压强度为14.65 MPa,24 h溶出液的pH为11.87,经过15次冻融循环后的质量损失率为3.34%,可供C30等级以下的非结构混凝土使用。To minimize the depletion of natural resources and optimize the use of fly ash(FA),the manufacture of cold-bonded alkali-activated artificial lightweight aggregates(CAALA)with fly ash(FA)and ground granulated blast furnace slag(GGBFS)were designed and fabricated.This study examined the impact of raw material proportioning on the properties of CAALA,specifically pelletization efficiency,physical properties,mechanical properties,and freeze-thaw resistance capacity.Then,the alkaline dissolution of CAALA was analyzed.Additionally,the analysis revealed that the increase in FA content led to a decrease in hydration products of C-A-S-H gels and an increase in harmful pores(>200 nm).When the optimal mass ratio of FA and GGBFS was 1∶1,CAALA achieved a pelletization efficiency of 92.01%,a loose bulk density of 1072 kg/m^(3)and a water absorption of 10.8%within 1 h.Additionally,it shows a cylinder compressive strength of 14.65 MPa,a pH of dissolution solution after 24 hours is 11.87 and a mass loss rate of 3.34%after 15 freeze-thaw cycles.Therefore,the use of FA in CAALA may be a suitable method for preparing non-structural concrete below C30 grade.

关 键 词：人造轻集料 圆盘造粒机 碱激发材料 筒压强度 耐久性 

分 类 号：TU526[建筑科学—建筑技术科学]