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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >Selection of Design Factors for the Use of Gravel in CRC Paving
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Selection of Design Factors for the Use of Gravel in CRC Paving

机译：CRC铺路中使用砾石的设计因素选择

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Gravel aggregates have been used for many years in the construction of continuous reinforced concrete (CRC) pavements in Texas. However, these pavements are in many instances subject to delamination and spalling distresses, and thus costly to maintain and repair. Evidence collected from extensive field studies has indicated that the bond of the aggregate-mortar interface at an early age is one of the most significant factors affecting the development of delamination and eventual spalling. In this research, a fractional factorial design (the Taguchi method) was applied to investigate the methodology for improving delamination resistance of CRC pavements. Four factors (i.e., aggregate type, water/cementitious ratio, replacement of ultra-fine fly ash, and curing method) with three levels for each factor based on the orthogonal array were considered. A fracture mechanics parameter, fracture toughness (K_(If)), was used to represent the aggregate-mortar bond strength. The significances of each factor to achieve better K_(If) were determined, and the optimum design combination was subsequently chosen and validated. The consistency between the results from the experimental design and laboratory validation provides highway agencies valuable recommendations and aid in selecting design factors for the use of gravel in paving construction to relieve delamination and further spalling distresses. A comprehensive investigation on overall aggregate contribution to pavement bonding performance will be considered in future research to ensure the integrity of the evaluation and analysis.
机译：砾石集料在德克萨斯州的连续钢筋混凝土（CRC）路面施工中已经使用了很多年。但是，这些铺面在许多情况下容易分层和剥落，因此维护和修理成本很高。从广泛的现场研究中收集到的证据表明，骨灰浆界面早年结合是影响分层和最终剥落发展的最重要因素之一。在这项研究中，采用分数阶因子设计（田口方法）来研究改善CRC路面抗分层性的方法。考虑了四个因素（即骨料类型，水灰比，替代超细粉煤灰和固化方法），每个因素基于正交数组分为三个级别。断裂力学参数，断裂韧性（K_（If）），被用来代表骨料-砂浆粘结强度。确定了实现更好的K_（If）的每个因素的重要性，然后选择并验证了最佳设计组合。实验设计和实验室验证的结果之间的一致性为公路部门提供了有价值的建议，并有助于选择在铺路施工中使用砾石的设计因素，以减轻分层和进一步剥落的困扰。在未来的研究中，将考虑对骨料对路面粘结性能的总体贡献进行全面调查，以确保评估和分析的完整性。

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