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建筑垃圾再生骨料在海绵城市储水结构体中的应用
马学通1, 高德彬1, 严耿升2, 王宝3
1.长安大学 地质工程与测绘学院, 陕西 西安 710054;2.中国电建集团西北勘测设计 研究院有限公司, 陕西 西安 710065;3.西安建筑科技大学 环境与市政工程学院, 陕西 西安 710055
摘要:
[目的] 研究建筑垃圾骨料对环境的影响,为建筑垃圾再生骨料用于“海绵城市”储水结构体等提供依据。[方法] 通过室内大型压缩固结试验,对建筑垃圾再生骨料在不同配比、不同含水率的颗粒破碎、压缩变形及储水率变化进行了研究,并通过浸出毒性试验对建筑垃圾骨料对环境的影响进行了研究。[结果] 再生骨料在压缩过程中具有破碎趋势,且废砖骨料破碎程度大于废混凝土骨料;随着废砖骨料比例的增加,颗粒破碎程度越大,压缩变形也愈大;骨料含水率对颗粒破碎影响机制不尽相同,当含水率从3%增加到12%时,颗粒破碎率从121.73%上升至132.64%,而含水率从12%上升至15%时,颗粒破碎率从132.64%下降至127.6%,在“最优含水率”(11.56%)附近取得极大值,且含水率通过影响颗粒破碎来影响再生骨料的压缩变形,颗粒破碎变化趋势与重型击实试验曲线具有一致性。可通过“最优含水率”指导储水结构体含水率的控制,减少颗粒破碎,提高结构体储水能力和承载能力。不同地区的建筑垃圾骨料对环境的影响不同,在应用中应避免已污染建筑垃圾的再利用。[结论] 建筑垃圾再生骨料可用于海绵城市储水结构体的建设,但需对建筑垃圾的来源进行区分,确保材料对环境无污染。
关键词:  建筑垃圾  再生骨料  压缩试验  颗粒破碎  海绵城市
DOI:10.13961/j.cnki.stbctb.2021.01.029
分类号:TU528;TU992
基金项目:国家自然科学基金项目“非饱和黄土中水分迁移规律的研究”(41372329);西北勘测设计研究院科技研发项目“建筑垃圾作为储水“海绵体”的体系结构及技术应用研究”(XBY2017-KJ-15);中国铁路总公司科技研发项目“建筑垃圾填料分类及填筑技术研究”(J14-09B)
Application of Recycled Construction Waste Aggregate in Sponge City Water Storage Structure
Ma Xuetong1, Gao Debin1, Yan Gengsheng2, Wang Bao3
1.School of Geological Engineering and Surveying, Chang'an University, Xi'an, Shaanxi 710054, China;2.Northwest Survey Design and Research Institute Co., Ltd. of China Power Construction Corporation, Xi'an, Shaanxi 710065, China;3.Department of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055
Abstract:
[Objective] The impact of construction waste aggregate on the environment was studied to provide a basis for the application of reclaimed aggregate of construction waste in the water storage structure of sponge cities.[Methods] The particle fragmentation, compression deformation, and water storage rate change of the building waste recycled aggregate at different ratios and different moisture contents were studied through an indoor large-scale compression solidification test, and the environmental impact of the construction waste materials was studied using a leaching toxicity test.[Results] The recycled aggregate had a crushing trend in the compression process, and the degree of crushing of waste brick recycled aggregate was greater than that of waste concrete recycled aggregate. When the moisture content increased from 3% to 12%, the particle crushing rate increased from 121.73% to 132.64%. When the moisture content increased from 12% to 15%, the particle crushing rate decreased from 132.64% to 127.6%, reaching the maximum value near the optimal moisture content (11.56%). The water content affected the compression deformation of the recycled aggregate by affecting particle breakage. The change trend of particle breakage was consistent with the curve of the heavy compaction test. The optimal moisture content can be used to guide the water content control of the water storage structure, reduce particle breakage, and improve the water storage capacity and carrying capacity of the structure. The aggregate of construction waste in different areas had different impacts on the environment, so the reuse of the polluted construction waste should be avoided in the application.[Conclusion] The recycled aggregate of construction waste can be used for the construction of water storage structures in sponge cities. However, it is necessary to distinguish the sources of construction waste to ensure that the materials are free of pollution to the environment.
Key words:  construction waste  recycled aggregate  compression test  particle fragmentation  sponge city