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首页> 外文会议>Fourth European Symposium on Performance of Bituminous and Hydraulic Materials in Pavements, Apr 11-12, 2002, Nottingham, United Kingdom >Improving the performance of cold bituminous emulsion mixtures (CBEMs) incorporating waste materials
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Improving the performance of cold bituminous emulsion mixtures (CBEMs) incorporating waste materials

机译：改善掺入废料的冷沥青乳液混合物（CBEM）的性能

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There exists no universally accepted Cold Bituminous Emulsion Mixtures (CBEMs) design procedure. Three design procedures, based on AASHTO and Asphalt Institute guidelines were studied and tested in this investigation. The main obstacles that restrict the adoption of CBEMs as a first option for all road layers include; high porosity, low early life strength and long curing times. The main aim of this investigation was to investigate ways of improving CBEMs volumetric and mechanical properties. Five different waste materials were incorporated into the cold mixture, i.e. PEA, Red Porphyry Sand, Synthetic Aggregates, Steel Slag and Crumb Rubber. The aggregate gradation was determined using a modified Fuller's curve. Improvements in all mixture properties were accomplished by increasing the compaction effort and incorporating cement. Three types of cements were tested, namely, OPC, Rapid Setting Cement and Natural Cement. It was found that the Rapid Setting Cement gave higher and faster rates of strength development. Additionally, attempts to accelerate curing times were made by compacting the CBEM specimens in two layers thus allowing the moisture to escape and reducing curing time. These trials provided encouraging results. The mix design procedure initially adopted in this investigation was found to be complicated, a more simplified cold mixture design procedure is also introduced in this paper. It was concluded that heavier compaction effort and incorporation of cement are very essential for improving the performance of CBEMs. When CBEMs are carefully designed and are allowed to achieve full curing, they become comparable to hot mixes.
机译：没有普遍接受的冷沥青乳液混合物（CBEM）设计程​​序。在这项调查中，研究和测试了基于AASHTO和沥青研究所指南的三种设计程序。限制将CBEM用作所有道路层的首选的主要障碍包括：孔隙率高，早期强度低，固化时间长。这项研究的主要目的是研究改善CBEM的体积和力学性能的方法。将五种不同的废料混入冷混合物中，即PEA，红斑岩砂，合成骨料，钢渣和碎橡胶。使用修正的富勒曲线确定聚集度。通过增加压实强度和掺入水泥，可以改善所有混合物的性能。测试了三种类型的水泥，即OPC，快速凝固水泥和天然水泥。发现快速凝固水泥给出了更高和更快的强度发展速率。另外，尝试通过将CBEM试样压紧成两层来加快固化时间，从而使水分逸出并缩短固化时间。这些试验提供了令人鼓舞的结果。研究中最初采用的混合料设计程序很复杂，本文还介绍了一种更为简化的冷混合料设计程序。结论是，加大压实强度和掺入水泥对改善CBEM的性能至关重要。精心设计CBEM并使其完全固化后，它们就可以与热混合料媲美。

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