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原文传递 Lime Utilization in the Laboratory, Field, and Design of Pavement Layers

题名：	Lime Utilization in the Laboratory, Field, and Design of Pavement Layers
作者：	Elseifi, M.; Dhakal, N.
关键词：	Lime stabilization##Pavement design##Lime Utilization##Working table##Subgrade##Dry soils##Field studies##Literature review##Test methods##Structural layer coefficients##Survey questionnaires##Hydrated lime and limestone products##
摘要：	The objective of this study was to review and report the best practices of using lime (i.e., granulated lime, hydrated lime, and slurry lime) to dry soil, in working tables, and in pavement applications. The project also reviewed and documented the incorporation of lime in pavement design in other states as well as test methods, field application, and evaluation techniques to assess the quality of field construction. Based on the results of the literature review and the survey questionnaire, it can be confidently stated that the overwhelming majority of laboratory and field studies involving lime-stabilization indicates that lime-stabilized sub-grades perform better than non-stabilized sub-grades, when due regard is given to materials design, structural design, durability, and construction. Enhanced performance is typically reported in terms of number of traffic loads to failure and strength properties of the sub-grade soil and has been reported to be cost-effective. Furthermore, test results suggest that lime does not leach over time and remains in the sub-grade after 5 to 11 years in service. With respect to consideration in the design, numerous states account for lime-stabilized sub-grade in pavement design; yet, some states do not account for lime-stabilized sub-grade in the design. For those states considering lime-stabilized sub-grade in the design, a structural layer coefficient around 0.11 has been commonly used. Since Louisiana typically uses lime concurrently with cement for sub-grade stabilization, it is reasonable to account for the stabilized layer in the design. Sub-grade may be dealt with in the design as a subbase layer such that a layer coefficient can be assigned. Concurrent to the recently-added UCS requirement, it is recommended to assign a layer coefficient of 0.05 in the design for lime and cement-stabilized sub-grade. A concurrent study regarding an equivalent modulus for stabilized sub-grade layers is also ongoing by LTRC.
总页数：	158
报告类型：	科技报告