Field compaction control by way of correlation between elasticity module and layer rigidity with moisture content

Abstract The present research had as its basic objective to contribute with the improvement in the quality control evaluation of the compacting process in road works. The real contribution of the survey is to establish an innovative way of controlling the compaction process in the field, with employment of the Humidity versus Rigidity and the Humidity versus Elasticity Module curves, turning the methodology faster and more efficient than the conventional procedures. In fact, to date, the compacting control procedures contemplate methods that are inaccurate and limited by several constraints, rendering the technique unfeasible and time consuming, in detriment of the work schedule. Thus, this study proposes to define a rational correlation criterion between the geotechnical characterization with results obtained in the laboratory using conventional methods and the elastic parameters obtained by applying the rigidity meter of compacted soils, based on a statistical treatment of data concerning the infrastructure of experimental road and railway sections. The results obtained in the research were the correlation curves for Humidity versus Rigidity, and for Humidity versus Elasticity Module, for the material of the deposit, with the corresponding equations. Thenceforth, with the correlation curves, it will be much easier to obtain the moisture content that the soil requires on the earthworks. By measuring the modulus of elasticity or rigidity through the stiffness meter of compacted soils, the respective curve checks if the value of the soil moisture content is compatible with the variation of the moisture content in the project.

摘要
本研究的基本目标是为道路工程压实过程的质量控制评价优化提供支撑。本调研的实际价值在于，采用湿度-刚度 (Humidity versus Rigidity)与湿度-弹性模量 (Humidity versus Elasticity Module)曲线，建立一种创新的现场压实过程管控方法，使该方法相较传统作业流程更为快捷高效。
事实上，截至目前，主流的压实管控方法均存在精度不足且受多重约束限制的问题，不仅导致该技术难以落地应用，还会耗费大量工时，拖慢工程施工进度。
有鉴于此，本研究基于试验性道路与铁路路段基础设施的相关数据统计处理，提出了一套合理的关联判定准则：可将采用传统实验室方法获取的土工特性表征结果，与通过压实土壤刚度仪测得的弹性参数建立科学关联。
本研究获取的核心成果为料场材料的湿度-刚度 (Humidity versus Rigidity)与湿度-弹性模量 (Humidity versus Elasticity Module)关联曲线，以及对应的计算公式。
依托上述关联曲线，可更为便捷地获取土方工程中土壤所需的最优含水率。通过压实土壤刚度仪测得弹性模量或刚度值后，即可通过对应曲线校验土壤实测含水率是否与工程设计的含水率要求相匹配。