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3. Engineer Detachment (Terrain), 579th

Title:	Report on laterite and its engineering properties
Authors:	Taranik, James V. Cording, Edward J.
Keywords:	Soils--Vietnam Laterite
Publisher:	United States. Army. Engineer Detachment (Terrain), 579th United States. Army. Engineer Command, Vietnam Engineer Research and Development Center (U.S.)
Abstract:	Abstract: The term Laterite generally refers to an indurated concretionary deposit, high in iron or aluminum oxide content, which has formed in place by the weathering of rocks in tropical climates. This material occurs as a zone in the profile of a tropical soil and can occur as a consolidated or unconsolidated layer in this zone. There is an extensive variation in the character of Laterite which is linked to the variation of the climate and physiography of South Vietnam. Two general varieties of I,aterite have been noted in south Vietnam; the Worm-Hole I,aterite, and the Pullet Laterite. Many of the red soils of Vietnam are being falsely referred to as Laterite or Lateritic. In only 30 of the soils of South Vietnam is the 1aterite formation potential for Laterite formation. Laterite in South Vietnam is commonly used on roads and airfields as H base course and surface course material. Then excavated the massive Laterite breaks down into a medium gravel containing some clay or silt of low plasticity (GC). Usually more than 40% of the material is retained on the #4 sieve and less than 30% passes the 300 sieve. Lab and field CBR is for Laterites having this gradation typically range from 20% to 80%. For design purposes a CBR of 20 % is recommended. Poorly developed 1aterites containing weakly cemented gravels or a high percentage of clay are less suited as a base course material and lower CBR values should be assigned.
Description:	Geology/Soils Survey
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/21685
Appears in Collections:	Engineer Detachment (Terrain), 579th