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首页> 外文期刊>Journal of Cleaner Production >Effects of active waste powder obtained from C&D waste on the microproperties and water permeability of concrete
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Effects of active waste powder obtained from C&D waste on the microproperties and water permeability of concrete

机译：C＆D废物中的活性废粉对混凝土微振动和渗透性的影响

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Using waste powder (WP) derived from construction and demolition (C&D) waste as supplementary cementitious materials in the preparation of waste powder concrete (WPC) provides a new way of reclaiming C&D waste. This paper focuses on investigating the microproperties and the water permeability of the WPC. A series of micro experiments and water permeability related tests were conducted. The results show that the elements and compound compositions of WP are similar with those of cement and fly ash. The addition of high fineness WP promotes the hydration rate and improves the pore structure of WPC due to its microaggregate filling effect. The incorporation of WP decreased the workability and drying shrinkage behavior of WPC, and the WPC with up to 30%WP has a satisfied compressive strength. The water permeability of the WPC, under capillary absorption and pressure, is lower than that of the control group, and the WPC with approximately 30%WP has the lowest water permeability. Subjected to the harsh environment of freeze-thaw cycles and applied loading, the addition of WP increases the sensitivity of the WPC to the imposed damage and water permeability. Although the imposed damage increases the water permeability of the WPC, incorporating appropriate content of WP leads to a lower water permeability of WPC than that of the control group when the exposure condition is the same. (C) 2020 Elsevier Ltd. All rights reserved.
机译：使用从施工和拆除（C＆D）废物中的废粉（WP）作为补充水泥材料制备废粉混凝土（WPC）提供了一种新的回收C＆D废物的新方法。本文侧重于调查WPC的微振动和水渗透性。进行了一系列微实验和水渗透性相关的测试。结果表明，WP的元素和复合组合物与水泥和粉煤灰的元素和复合组合物相似。添加高细度WP促进水合速率并由于其微凝胶灌装效果而改善WPC的孔隙结构。 WP的掺入降低了WPC的可加工性和干燥收缩行为，并且具有高达30％WP的WPC具有满意的抗压强度。 WPC在毛细管吸收和压力下的水渗透率低于对照组的水渗透性，并且具有约30％WP的WPC具有最低的水渗透性。经过冻融循环的恶劣环境和施加加载，加入WP增加了WPC对施加损坏和渗透性的敏感性。尽管施加的损伤增加了WPC的水渗透性，但是当暴露条件相同时，将WP的适当含量导致WPC的较低的水渗透性比对照组。 （c）2020 elestvier有限公司保留所有权利。

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