Comparison of Reduced Modified Proctor vs Modified Proctor
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TECHNICAL NOTE
Comparison of Reduced Modified Proctor vs Modified Proctor H. S. Shaivan . A. Sridharan
Received: 29 July 2019 / Accepted: 2 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract The compaction characteristics between reduced modified Proctor and modified Proctor tests have been compared. The results show that maximum dry unit weight values are comparable for both the tests but optimum moisture content values differ slightly more. For both the tests: optimum moisture content was found to correlate best with liquid limit, and the relationship for maximum dry unit weight with optimum moisture content was found to be almost the same. Since reduced modified Proctor requires less time and 40% less compaction energy as compared to modified Proctor test, it can be considered as a suitable alternative to the modified Proctor test. Keywords Reduced modified Proctor Modified Proctor Compaction characteristics Correlations Abbreviations MDDRMP Maximum dry unit weight from reduced modified Proctor test MDDMP Maximum dry unit weight from modified Proctor test
H. S. Shaivan (&) Department of Civil Engineering, Indian Institute of Science, Bangalore, India e-mail: [email protected] A. Sridharan Indian National Science Academy, New Delhi, India e-mail: [email protected]
OMCRMP OMCMP wL wP IP
Optimum moisture content from reduced modified Proctor test Optimum moisture content from modified Proctor test Liquid limit of soil Plastic limit of soil Plasticity index of soil
1 Introduction Mechanical compaction of soil is a frequently employed ground improvement technique in construction practice to improve the geotechnical engineering properties of the soil. Compaction of soil results in an increase in density and shear strength, and a reduction in settlement and permeability. However, to obtain the desired improvement in the engineering properties of the soil, it is necessary to compact the soil at its optimum moisture content (OMC) which is determined in the laboratory by performing the standard Proctor test. As per ASTM D698, the standard Proctor test is carried out in a mould of diameter 4 in. (101.6 mm) and height 4.58 in. (116.4 mm) with the soil being compacted in three layers, with each layer of soil receiving 25 blows of a 2.5 kg rammer falling freely through a height of 12 in. (304.8 mm). In some particular instances, such as in the case of airfield pavements and highways designed to withstand higher traffic loads, it becomes necessary to compact the soil
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Geotech Geol Eng
to higher density. In such cases, modified Proctor test is performed in the laboratory to determine the compaction characteristics of soil which typically results in an increase in maximum dry density and decrease in optimum moisture content of the soil compared to standard Proctor test. However, the modified Proctor test procedure as per ASTM D1557 requires the soil to be compacted in 5 layers, with each layer receiving 25 blows of a 4.54 kg rammer falling fre
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