泡沫混凝土胶结再生骨料充填材料的制备及性能研究
Preparation and performance study of the foamed concrete bonded recycled aggregate filling materials
关键词:
泡沫混凝土;充填材料;再生骨料;工作性;强度;表观密度;微观结构
Key words:
Foamed concrete; Filling material; Recycled aggregate; Workability; Strength; Apparent density; Microstructure
刊期:
2025年第8期
DOI:
10.19761/j.1000-4637.2025.08.031.05
文章编号:
基金项目:
国家重点研发计划项目(2016YFC0701004);四川省科技计划“揭榜挂帅”项目(2023YFG0379)。
作者:
犹 娅1,2,牛云辉2,3,*,刘志艳2,邓 鑫2,郭荣科2,卢忠远2,李 军2
单位:
1.西南科技大学,四川 绵阳 621000;2.西南科技大学 材料与化学学院 环境友好能源材料国家重点实验室,四川 绵阳 621000;3.成都建工集团有限公司,四川 成都 610000
摘要
摘 要:研究了干密度(400、600、800、1 000 kg/m3)对泡沫混凝土工作性及抗压强度的影响,探究了泡沫混凝土干密度、泡沫混凝土浆体体积占比(65%、70%、75%、80%)和粗骨料类型(碎石、再生骨料)对挖空区、肥槽等工程用充填材料力学性能和表观密度的影响,并进行了微观分析。结果表明:随着干密度的增加,泡沫混凝土的工作性改善,抗压强度基本增大,再生骨料充填材料的抗压强度、表观密度均提高;随着泡沫混凝土浆体体积占比的减小,再生骨料充填材料的抗压强度减小,表观密度增大;再生骨料充填材料的抗压强度高于天然骨料充填材料的抗压强度;泡沫混凝土与再生骨料黏结较好,界面过渡区较密实,而与天然骨料之间的黏结相对较差,二者之间存在相对明显的界面过渡区。
Abstract: The effect of dry density(400, 600, 800, 1 000 kg/m3) on the workability and compressive strength of foamed concrete was studied. The effects of dry density of foamed concrete, the volume percentage(65%, 70%, 75%, 80%) of foamed concrete slurry, and the coarse aggregate type(crushed stone, recycled aggregate) on the mechanical property and apparent density of the filling materials used in engineering applications such as excavated areas and foundation pits were investigated, and microscopic analysis was carried out. The results indicate that, with the increase of the dry density, the workability of the foamed concrete improves, the compressive strength of foamed concrete basically increases, and the compressive strength and apparent density of filling materials with recycled aggregate increase. With the decrease of the volume percentage of foamed concrete slurry, the compressive strength of the filling materials with recycled aggregate decreases, and the apparent density increases. The compressive strength of filling materials with recycled aggregate is higher than that of filling materials with natural aggregate. The bonding between the foamed concrete and the recycled aggregate is better, and the interfacial transition zone is denser. The bonding between the foamed concrete and the natural aggregate is poorer, and the interfacial transition zone is obvious.
结论
(1)随着泡沫混凝土干密度的增加,泡沫混凝土的V型漏斗流出时间降低,扩展度、沉缩率、7 d和28 d抗压强度基本增大。
(2)随着泡沫混凝土干密度的增加,再生骨料充填材料的抗压强度、表观密度均提高;随着泡沫混凝土浆体体积占比的减小,再生骨料充填材料的抗压强度减小,表观密度增大;再生骨料充填材料的抗压强度高于天然骨料充填材料的抗压强度。再生骨料充填材料的抗压强度均大于0.5 MPa,可用于肥槽、道路边坡回填。
(3)随着泡沫混凝土干密度的增加,再生骨料充填材料中的孔隙数量减少、孔径细化,结构密实度提高;再生骨料充填材料的受压破坏均发生在骨料与泡沫混凝土的胶结界面处;泡沫混凝土基体与再生骨料黏结较好,界面过渡区较密实,而与天然骨料之间的黏结较差,二者之间存在较明显的界面过渡区。
参考文献
[1] 郭月梅.公路工程施工阶段的环保管理及有效措施[J].资源节约与环保,2017(11):78,82
[2] 李根旺.道路拆除中建筑垃圾再生利用实施模式研究[J].环境科学与理,2018,43(6):69-72.
[3] 张海伟.废弃混凝土路面再生骨料路用性能试验研究[D].郑州:郑州大学,2019.
[4] KUMAR R.Influence of recycled coarse aggregate derived from construction and demolition waste (CDW) on abrasion resistance of pavement concrete[J].Construction and Building Materials,2017,142:248-255.
[5] OGBONNA A C.Laboratory evaluation of the characteristics of continuously reinforced concrete pavement incorporating recycled concrete aggregate[J].Australian Jourmal of Civil Engineering,2018,16(1):38-45.
[6] 肖云飞,薛丹璇,朱晓东,等.固废再生路面基层材料研究进展综述[J].内蒙古公路与运输,2023(5):27-30.
[7] 高启聚,丛林,郭忠印.废弃水泥混凝土路面板在路面基层中的再生利用[J].公路交通科技,2008(2):20-23.
[8] 黄朝广.建筑垃圾废弃混凝土再生集料应用于路面基层材料的可行性分析[J].粘接,2021,47(9):115-119.
[9] 范炜,陈峰.再生骨料的基本物理力学性能试验研究[J].水利与建筑工程学报,2017,15(2):121-123.
[10] 张灵通,张栋,李宝元,等.建筑废弃混凝土再生骨料在道路路基中的应用[J].黑龙江科学,2023,14(20):18-21.
[11] 时成林,姚俊杰,宋文祝,等.水泥稳定建筑固废碎石基层性能研究[J].四川水泥,2022(1):13-15.
[12] 王丽红,鲍爱华,罗园园.中国充填技术应用与展望[J].矿业研究与开发,2017,37(3):1-7.
[13] 田国鑫,黄俊.浅谈国内外泡沫混凝土的发展与应用[J].混凝土,2017(3):124-128.
[14] 郭骏伟,李晓英.泡沫混凝土在城市地下建(构)筑物处理中的应用[J].天津建设科技,2023,33(2):45-48.
[15] 马旭,高蕾,王桐,等.采空区充填泡沫混凝土制备及其性能研究[J].煤矿现代化,2022,31(6):84-86,91.
[16] 尹蕾.堆石混凝土的应用现状与发展趋势[J].水利水电技术,2012,43(7):1-4.
[17] XIE Y T,CORR D J,CHAOUCHE M,et al.Experimental study of filling capacity of self-compacting concrete and its influence on the properties of rock-filled concrete[J].Cement and Concrete Research,2014,56:121-128.
[18] 石建军,张志恒,金峰,等.自密实混凝土充填堆石体的试验[J].南华大学学报(自然科学版),2005(1):38-41.
[19] OKAMURA H,OUCHI M.Self-compacting concrete[J].Journal of Advanced Concrete Technology,2003,1(1):5-15.
[20] ROUSSEL N,NGUYEN T,YAZOGHLI O,et al.Passing ability of fresh concrete:A probabilistic approach[J].Cement and Concrete Research,2008,39(3):227-232.
[21] 张建彪,杨永富,张哲,等.再生粗骨料自密实混凝土基本性能试验研究[J].混凝土与水泥制品,2022(11):89-92.
[22] 工业和信息化部.矿山采空区充填用尾砂混凝土:JC/T 2478—2018[S].北京:建材工业出版社,2018.
引用本文
犹娅,牛云辉,刘志艳,等.泡沫混凝土胶结再生骨料充填材料的制备及性能研究[J].混凝土与水泥制品,2025(8):31-35.
YOU Y,NIU Y H,LIU Z Y,et al.Preparation and performance study of the foamed concrete bonded recycled aggregate filling materials[J].China Concrete and Cement Products,2025(8):31-35.
上一个: 全再生混凝土的抗压强度与耐久性能研究
相关文件