An experimental program was undertaken to investigate the effects of discrete polypropylene fibres and low dosage ordinary Portland cement (OPC) on the stress-strain and unconfined compressive strength behavior of clayey soil. Multifilament polypropylene fibre in three different lengths (6.0mm, 12.0mm, and 19.0mm) and two fibre dosages (i.e. 0.5percent and 1.0percent by dry weight of soil) were considered. At first, compaction characteristics of the untreated soil were evaluated at standard compaction energy. Using compaction characteristics of untreated soil 9 different fibre-cement-soil mixtures (i.e. fibre/soil-cement ratio of 0.5percent and 1.0percent and cement/soil ratio of 0.0percent, 3.0percent and 6.0percent by dry weight) were composed, and their unconfined compression test were carried out after 1-, 7-, and 28-days curing periods. The obtained test results indicated that the effect of fibre dosage on the stress-strain behavior is superior to the effect of fibre length.
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