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生活垃圾焚烧炉渣对混凝土性能影响及微观机理研究

作者：章志1，2

关键字：生活,垃圾焚烧,炉渣,对,混凝土,性能,影响,及,

　
（1.上海市市政规划设计研究院有限公司，上海  200031；
2.上海城市路域生态工程技术研究中心，上海  201418）
    摘要：研究了生活垃圾焚烧炉渣性质、工艺以及搅拌工艺对混凝土物理力学性能的影响。结果表明：炉渣掺量增加导致混凝土强度急剧降低，m（炉渣）∶m（胶凝材料）由1.38增加至5.36时，28 d抗压强度降低了91.2%；炉渣均值粒径由2.50 mm降至1.99 mm时，混凝土的28 d抗压强度降低了52.2%；使用粗炉渣取代66%细炉渣使得混凝土28 d抗压强度较只使用细炉渣提高了170.7%；采用先水后渣搅拌工艺可使混凝土28 d抗压强度较采用先渣后水时提高31.1%。炉渣混凝土体积稳定性严重不良，主要由炉渣中铝、铁等金属、玻璃颗粒以及Cl-、SO42-等有害物质造成炉渣混凝土内部产生不同尺度裂隙、吸水膨胀的絮状物以及破坏硬化水泥石结构的结晶物所致。
    关键词：混凝土；生活垃圾焚烧炉渣；抗压性能；体积稳定性
    中图分类号：TU528.041        文献标识码：A        文章编号：1001-702X（2023）04-0056-05
 
Study on the influence of domestic waste incineration bottom ash on property of concrete and its micro mechanism
ZHANG Zhi1，2
（1.Shanghai Municipal Planning & Design Institute Co. Ltd.，Shanghai 200031，China；
2.Shanghai Engineering Research Center of Urban Road Ecological Technology，Shanghai 201418，China）
    Abstract：The effects of the properties，process and mixing technology of domestic waste incineration bottom ash（IBA） on the physical and mechanical properties of concrete were studied. The research shows that the increase of IBA content leads to a sharp decrease in concrete strength. When the IBA/cementitious material increases from 1.38 to 5.36，the 28 compressive strength decreases by 91.2%. When the average particle size of IBA decreases from 2.50 mm to 1.99 mm，the concrete strength decreases by 52.2%. Using coarse IBA to replace 66% fine IBA，28 d compressive strength of concrete can improve by 170.7%，compared with the IBA concrete formed by the "IBA first and then water" mixing process，the "water first and then IBA" mixing process can improve the concrete 28 d compressive strength by 31.1%. The volume stability of IBA concrete is seriously poor. This is mainly caused by the cracks of different scales，floccules of water absorption expansion and crystals that damage the hardened cement stone structure，which are caused by aluminum，iron and other metals，glass particles，Cl-，SO42- and other harmful substances in the IBA concrete.
    Key words：concrete，domestic waste incineration bottom ash，compressive properties，volume stability