Deformation of gypsum sand during cyclic soaking and drying

Amiruddin Ismail, W. J. Hilo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This study presents an experimental study into the effect of cyclic soaking and drying on the behaviour of gypsum sand subgrade soil brought from Al-Garma village in Al-Anbar state, north-west of Baghdad (in Iraq). For studying the effect of cyclic soaking and drying on the deformation characteristics of the soil tested, five different cycle lengths were adopted namely 8, 14, 28, 60 and 180 days. For each cycle length the study covered six cycles. Each cycle consists of two phases of equal length namely a soaking phase followed by a drying phase. CBR (Clay-Bearing Rock) soil samples were prepared at 95% compaction and subjected to a surcharge load of 45 lb (200.3N) representing a flexible pavement structure of about 57 cm total thickness. The results reveals that the CBR decreases during the soaking phase and increases during the drying phase of each cycle of the cyclic soaking and drying and that the equilibrium condition is rather achieved at the end of the fifth cycle independent of the cycle length. Vertical displacement measurements were carried out for each cycle length to arrive at the soil behaviour of swelling/settlement with time. Regarding the deformation it was found that continuous soaking underestimates generally the final deformation of gypsiferous soils as compared with cyclic soaking and drying.

Original languageEnglish
Pages (from-to)4610-4616
Number of pages7
JournalJournal of Applied Sciences
Volume8
Issue number24
DOIs
Publication statusPublished - 2008

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gypsum
sand
soil
clay
subgrade
drying
soaking
pavement
rock
swelling
compaction
village
experimental study

Keywords

  • Cohesive
  • Efflorescence
  • Gypsum behaviour
  • Pavement structure
  • Soil characteristics
  • Swelling

ASJC Scopus subject areas

  • General

Cite this

Deformation of gypsum sand during cyclic soaking and drying. / Ismail, Amiruddin; Hilo, W. J.

In: Journal of Applied Sciences, Vol. 8, No. 24, 2008, p. 4610-4616.

Research output: Contribution to journalArticle

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