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Interface shear properties of geosynthetics and construction and demolition waste from large-scale direct shear tests

机译：大规模直接剪切试验中土工合成材料和建筑及拆迁废物的界面剪切特性

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摘要

In recent years environmental sustainability has demanded a progressive increase of waste recycling in general and waste value-added utilisation in the construction industry in particular. As regards the application of construction and demolition wastes (C&DW) in geotechnical works, it has been noticed that the use of recycled aggregates is found mostly in road construction. Value-added utilisation of C&DW in geosynthetic-reinforced structures is almost an unexplored field. This paper presents the results of physical, mechanical and environmental characterisation of recycled C&DW, as well as the direct shear behaviour of three recycled C&DW-geosynthetic interfaces. The C&DW material was collected from a recycling plant and came from the demolition of single-family houses and the cleaning of land with illegal deposits of C&DW. Two geogrids and one geocomposite reinforcement (high-strength geotextile) were used to assess the behaviour of C&DW-geosynthetic interfaces. The environmental characterisation of the C&DW, carried out through leaching tests, did not show environmental concerns. Direct shear test results have demonstrated that properly selected and compacted C&DW can exhibit shear strength similar to natural soils. The coefficients of interaction achieved for C&DW-geosynthetic interfaces compare well with those reported in the literature for soil-geosynthetic interfaces under similar conditions, which supports the feasibility of using these recycled materials as backfill in geosynthetic-reinforced structures.
机译：近年来，环境的可持续性要求逐步提高废物的总体回收利用率，尤其是建筑行业的废物增值利用。关于建筑和拆除废物在土力工程中的应用，已经注意到回收骨料的使用主要用于道路建设。土工合成材料增强结构中C＆DW的增值利用几乎是一个尚未探索的领域。本文介绍了再生C＆DW的物理，机械和环境表征的结果，以及三种再生C＆DW-土工合成材料界面的直接剪切行为。 C＆DW材料是从一家回收工厂收集的，来自拆毁单户住宅和清理带有C＆DW非法沉积物的土地。使用两个土工格栅和一个土工复合材料增强材料（高强度土工织物）来评估C＆DW-土工合成材料界面的行为。通过浸出测试对C＆DW进行的环境表征并未显示出环境问题。直接剪切试验结果表明，正确选择和压实的C＆DW可以表现出与天然土壤相似的剪切强度。 C＆DW-土工合成材料界面实现的相互作用系数与文献报道的相似条件下的土壤-土工合成材料界面的相互作用系数很好，这支持了在土工合成材料加固的结构中使用这些可回收​​材料作为回填的可行性。

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