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A prompt procedure for prediction of strength in artificially cemented soft soils


The focus of this paper is to present a new evaluation method for strength gain in very soft soils when using cementation as a means of improvement. This test procedure was created due to great difficulty encountered in molding specimens for compression and tensile tests in very soft clays and silts. The test consists in the measurement of the maximum force applied to embed a flat base rod into a soil mass using high sensibility dynamometric rings. The maximum pressure (maximum force divided by the flat base rod area) recorded up to 30 mm embedding of the rod into the soil mass is adopted as reference and has been shown to have direct linear correlation to Brazilian tensile tests. A correlation was set to a range of different materials encouraging its use in engineering practice. The main advantages of the proposed test are the easiness to mold specimens, the option of carrying out multiple tests in a single specimen and the possibility of carrying out tests outside the laboratory environment.