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首页> 外文期刊>Structural Survey >Recycled brick masonry aggregate concrete: Use of brick masonry from construction and demolition waste as recycled aggregate in concrete
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Recycled brick masonry aggregate concrete: Use of brick masonry from construction and demolition waste as recycled aggregate in concrete

机译：再生砖石骨料混凝土：建筑废料和拆除废物中的砖石料作为混凝土中的再生骨料的用途

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Purpose - Reuse of construction and demolition (C&D) waste as aggregates is becoming increasingly popular for a number of environmental and economic reasons. The purpose of this paper is to explore this topic. Design/methodology/approach - In this study, structural- and pavement-grade Portland cement concrete (PCC) mixtures were developed using crushed recycled brick masonry from a demolition site as a replacement for conventional coarse aggregate. Prior to developing concrete mixtures, testing was performed to determine properties of whole clay brick and tile, as well as the crushed recycled brick masonry aggregate (RBMA), and a database of material properties was developed. Findings - Concrete mixtures exhibiting acceptable workability and other fresh concrete properties were obtained, and tests were performed to assess mechanical properties and durability performance of the hardened concrete. Results indicated that recycled brick masonry aggregate concrete (RBMAC) mixtures can exhibit mechanical properties comparable to that of structural- and pavement-grade PCC containing conventional coarse aggregates. Research limitations/implications - Results for durability performance were mixed, but additional testing to evaluate durability performance is recommended. Practical implications - Although RBMAC has been untested in field applications, results of laboratory studies performed to date indicate that this material shows promise for use in pavement and structural applications. Future testing of RBMAC in both laboratory and field settings will allow stakeholders to gain a comfort level with its properties, identify specific potential uses, and establish guidelines that will assist in ensuring acceptable service life performance. Originality/value - From the standpoint of sustainability, use of recycled materials as aggregates provides several advantages. Landfill space used for disposal is decreased, and existing natural aggregate sources are not as quickly depleted. Use of recycled aggregates in lieu of virgin quarried aggregates can potentially result in a lower embodied energy of the concrete, although this is often dependent on hauling costs. This particularly holds true if the methodology used to compute the embodied energy of a structure accounts for the "recovery" of energy at the end of its service life.
机译：目的-由于多种环境和经济原因，作为集料的建筑和拆除（C＆D）废物的再利用变得越来越受欢迎。本文的目的是探讨这个主题。设计/方法/方法-在本研究中，使用拆除现场的碎砖再生砖石代替传统的粗骨料，开发出结构级和路面级的波特兰水泥混凝土（PCC）混合物。在开发混凝土混合物之前，先进行测试以确定整块粘土砖和瓷砖的性能，以及碎砖砌体的再生骨料（RBMA），并建立了材料特性数据库。发现-获得表现出可接受的可加工性和其他新鲜混凝土性能的混凝土混合物，并进行了测试以评估硬化混凝土的机械性能和耐久性能。结果表明，再生砖砌体骨料混凝土（RBMAC）混合物的力学性能与包含常规粗骨料的结构级和路面级PCC相当。研究局限/意义-耐久性能的结果参差不齐，但建议进行其他测试以评估耐久性能。实际意义-尽管RBMAC尚未在现场应用中进行测试，但迄今为止进行的实验室研究结果表明，该材料显示了在路面和结构应用中的应用前景。未来在实验室和现场环境中对RBMAC进行的测试将使利益相关者可以对其性能感到满意，确定特定的潜在用途，并建立有助于确保可接受的使用寿命的准则。原创性/价值-从可持续性的角度出发，将再生材料用作骨料具有许多优势。用于处置的垃圾掩埋空间减少了，现有的天然骨料来源没有那么快地耗尽。使用回收骨料代替原始采石骨料可能会导致混凝土的内含能量降低，尽管这通常取决于运输成本。如果用于计算结构的体现能量的方法在其使用寿命结束时考虑了能量的“回收”，则尤其如此。

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