Compaction Properties of Municipal Solid Waste

F. N. Okonta, N. Ngcobo, M. Mtsweni, D. Harris

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)


Waste compaction decrease insitu waste void, improve landfill stability and extend landfill life. Recently buried waste was excavated from two large pits in Johannesburg Robinson Deep Landfill site. The compaction characteristics such as optimum moisture content (womc), compaction effort (Ce) and maximum dry density (γmdd) of the bulk and reconstituted waste mass were investigated in the laboratory. Compaction effort ranging from 5 layers and 35 blows per layer to 5 layers and 175 blow per layer of as received and reconstituted samples was investigated. The result of series of modified proctor effort revealed that the density of waste mass is dependent on the relative constitution of organics and plastics. Waste mass constituted of 50% of organics, the maximum. Maximum density of waste mass decreased with percentage of plastic and waste mass constituted of 20% plastics was not compactible. The maximum dry unit weight of as received waste was dependent on the precompaction moisture content. The maximum dry unit weight of initially soaked was greater than that of the initially dried waste mass. The reproducibility of specific gravity of the compacted waste mass was dependent on specimen mass and test results which were determined by the use of waste specimens that were are less than 200 g was not reproducible. The relationship between density and compaction effort (KN.m/m3) was nonlinear with R2 = 0.9196, for the range of 35 blow/layer [44 KN.m/m3] and 175 blows/layer [222.04 KN.m/m3], and can provide good estimate of field parameters of compaction plant in relation to number of passes.

Original languageEnglish
Title of host publicationContemporary Issues in Geoenvironmental Engineering - Proceedings of the 1st GeoMEast International Congress and Exhibition, Egypt 2017 on Sustainable Civil Infrastructures
EditorsD. N. Singh, Abdullah Galaa
PublisherSpringer Science and Business Media B.V.
Number of pages14
ISBN (Print)9783319616117
Publication statusPublished - 2018
Event1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017 - Sharm El Sheikh, Egypt
Duration: 15 Jul 201719 Jul 2017

Publication series

NameSustainable Civil Infrastructures
ISSN (Print)2366-3405
ISSN (Electronic)2366-3413


Conference1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017
CitySharm El Sheikh


  • Compaction
  • Compaction effort
  • Degree of saturation
  • Domestic waste
  • Dry density
  • Dry unit weight
  • Insitu bulk unit weight
  • Maximum dry density
  • Moisture content
  • Optimum moisture content
  • Reconstituted waste mass
  • Specific gravity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Computational Mechanics
  • Geotechnical Engineering and Engineering Geology
  • Environmental Engineering


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