Results (
Thai) 1:
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To verify whether the threshold was similar for all cementcontents, more test data on samples were plotted in Fig. 12. Specimenwith different cement contents, mixing with fiber bundles of40 mm or with polypropylene fibers of 6 mm, were cured for 28days and tested to show the relationship between their strengthversus fiber contents. When the fiber content was 2%, the relationshipbetween strength versus fiber contents is approximatelylinear. The fiber bonds and tensile strength provided by fibers werethe main source of improvement for specimens with low cementcontents. However, for the specimens with cement content of 4%and 6%, it appears that the cementation effect became the dominantsource of improvement and that excessive fibers do notfurther assist in increasing the strength of improved clay. Thestrength of both types of specimens reached a maximum point inthe fiber content range tested. For the improved clay with a cementcontent of 4%, the threshold is around the fiber content of 1.5%. Thethreshold is found to be between fiber content 0.5% and 1% at acement content of 6%.
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