An Investigation of Compaction Variability for Selected Highway Projects in Indiana

Highway Research Record Pub Date : 1900-01-01 DOI:10.5703/1288284314474

T. Williamson, E. J. Yoder

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引用次数: 6

Abstract

THE AREA OF STUDY CHOSEN FOR THIS PROJECT WAS COMPACTION CONTROL OF SUBBASE AND SUBGRADE ELEMENTS AS USED UNDER RIGID PAVEMENTS. THREE PROJECTS OF EACH WERE SELECTED FOR INVESTIGATION IN INDIANA. THE OBJECTIVE WAS /1/ TO GATHER DATA TO DETERMINE WHAT LEVEL OF COMPACTION WAS ACTUALLY BEING ACHIEVED UNDER PRESENT CONSTRUCTION PRACTICES BY STUDYING THE VARIABILITY IN COMPACTION AND THE FACTORS CAUSING THE VARIABILITY, AND /2/ TO DETERMINE HOW A STATISTICAL QUALITY CONTROL MIGHT BE DEVELOPED FROM THESE DATA. TO ASSURE A REALISTIC ESTIMATE OF THE TRUE LEVEL OF COMPACTION, ONE HUNDRED FIELD DENSITY TESTS WERE PERFORMED FOR EACH PROJECT BY SELECTING TEN UNITS OF CONSTRUCTION OF EQUAL SIZE AND MAKING FIVE RANDOMLY REPLICATED DENSITY TESTS IN EACH. REFERENCE VALUES FOR PERCENT COMPACTION WAS THE USE OF ONE-POINT FIELD COMPACTION TEST IN CONJUNCTION WITH A FAMILY OF TYPICAL CURVES. RESULTS OBTAINED INDICATED AN OVERALL LEVEL OF COMPACTION LOWER THAN THAT SPECIFIED. VARIABILITY IN COMPACTION WAS LARGE. DATA INDICATED GREATER VARIABILITY IN THE SUBGRADE COMPACTION THAN IN THE SUBBASES. THE STATISTICAL ANALYSIS INDICATED MORE TESTS FOR A UNIT WERE REQUIRED TO INSURE UNIFORM COMPACTION. A MAIN PROBLEM IS TO INSURE THAT TESTS ARE PROPERLY PERFORMED. /AUTHOR/

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印第安纳州选定公路项目压实变异性的调查

本项目选择的研究领域是刚性路面下基层和路基构件的压实控制。各选择三个项目在印第安纳州进行调查。目的是收集数据，通过研究压实的可变性和引起可变性的因素，确定在目前的施工实践中实际达到的压实水平，以及确定如何从这些数据中开发统计质量控制。为了确保对真实的压实程度作出现实的估计，对每个项目进行了100次实地密度测试，选择10个同等大小的建筑单元，并在每个单元中随机重复进行5次密度测试。百分比压实的参考值是使用一点现场压实试验与一组典型曲线相结合。获得的结果表明，压实的总体水平低于指定的水平。压实变化很大。数据表明，路基压实比地基压实变化更大。统计分析表明，为确保均匀压实，需要对一个单元进行更多的测试。一个主要问题是确保测试正确执行。/作者/

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Highway Research Record

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