雷一鸣1,李金凯1,乔 林2,赵丕琪1,刘宗明1
（1. 济南大学材料科学与工程学院,山东济南250022;2. 山东创伟外墙保温材料有限公司,山东济南250013）
引用格式：雷一鸣,李金凯,乔林,等.应用挤塑板颗粒制备轻骨料混凝土[J].中国粉体技术,2023,29(3)：72-80.
LEI Y M,LI J K,QIAO L,et al.Preparation of light aggregate concrete with extruded plate particles[J].China Powder Science and Technology,2023,29(3)：72-80.
DOI：10.13732/j.issn.1008-5548.2023.03.007
收稿日期： 2022-09-29,修回日期：2022-11-10，在线出版时间：2023-04-17 10：04。
基金项目：国家自然科学基金项目,编号：52172021。
第一作者简介：雷一鸣(1997—),男,硕士研究生,研究方向为混凝土。E-mail：2768068263@qq.com。
通信作者简介：李金凯(1985—),男,副教授,博士,硕士生导师,研究方向为无机非金属材料。E-mail：mse_lijk@ujn.edu.cn。
摘要： 在生产挤塑聚苯乙烯板(XPS)的过程中会产生大量的颗粒废料,为避免产生环境问题,可将XPS颗粒废料用于制备轻骨料混凝土。采用外掺法研究聚苯颗粒掺量、XPS废料颗粒和可再分散性乳胶粉对轻骨料混凝土性能的影响。结果表明：聚苯颗粒体积掺量小于1 200 mL时,与混凝土的抗压强度、抗折强度、密度呈线性关系,当聚苯颗粒体积掺量为1 500 mL时在混凝土中趋向于饱和;可再分散性乳胶粉能改善聚苯颗粒与混凝土之间的界面问题,当质量掺量为6 g时,抗压强度提高了28%、抗折强度提高了48%。使用XPS颗粒等体积取代聚苯颗粒,XPS颗粒较大的空隙率导致导热系数升高;计算中去除颗粒之间空隙后,XPS颗粒等体积取代聚苯颗粒,当取代2/3的聚苯颗粒时导热系数降至0.0 896 W/(m·K)。
关键词： 轻骨料混凝土;挤塑板;聚苯颗粒;导热系数
Abstract：A large amount of particle waste is produced during the production of extruded polystyrene board (XPS).In order to avoid environmental problems,XPS particle waste is used to prepare lightweight aggregate concrete.The influence of the content of polystyrene particles,XPS waste particles and redispersible latex powder on the performance of lightweight aggregate concrete was studied by the external mixing method.The results show that when the volume of polystyrene particles is less than 1 200 mL,it has a linear relationship with the compressive strength,flexural strength and density of concrete.When the volume of polystyrene particles is 1 500 mL,it tends to be saturated in concrete.Redispersible emulsion powder can improve the interface between polystyrene particles and concrete.When the content is 6 g,the compressive strength increases 28% and the flexural strength increases 48%.When XPS particles are used to replace polystyrene particles in equal volume,the larger porosity of XPS particles leads to the increase of thermal conductivity.After removing the gap between particles in the calculation,XPS particles replace polystyrene particles in equal volume,and the thermal conductivity decreases to 0.0 896 W/(m·K) when replacing 2/3 of polystyrene particles.
Keywords：light aggregate concrete;plastic extruded board;polystyrene particle;thermal conductivity
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