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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Study of Laboratory and Field Tests Related to Soil Compaction Based on Proficiency Testing Schemes
Author(s)
José Neves1, Ana Duarte2 and Claúdia Silva2
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DOI:10.17265/2161-6221/2013.12.004
Affiliation(s)
1. Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, Universidade de Lisboa, Lisboa 1049-001, Portugal 2. RELACRE, Portuguese Association of Accredited Laboratories, Lisboa 1050-113, Portugal
ABSTRACT
The main objective of the paper is to present some understandings of laboratory and field tests related to soil compaction and useful for quality control purposes. The methodology of this study is different of other similar works because it is based on proficiency testing schemes (PTS), involving several operators and test devices. The study was performed in the following test methods: laboratory Proctor compaction test; determination of density and unit weight of soil in place by the sand-cone method; and determination of density and water content of soil and soil-aggregate by nuclear methods. The paper describes the procedures followed for the PTS implementation. The statistical analysis is presented, firstly focusing on the repeatability and reproducibility of the test results. Secondly, beyond this analysis, the paper describes some studies related to practical aspects of the test methods: the influence of the manual or mechanical compaction devices in the modified Proctor test results; the comparison between direct transmission and the backscatter modes in the case of the wet density measurements obtained by the in situ nuclear method; the relationship concerning test results obtained by the nuclear and conventional methods used in the field quality control.
KEYWORDS
Proficiency testing schemes, soil compaction, density, water content, quality control.
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