Soil modifcation with Portland cement is the most common practice in geotechnical engineering. The applicationof micro-fne cement causes proper intrusion of the provided slurry into the soil voids and consequently decreasesthe porosity to a greater quantity. In order to determine the utility and behavior of cements with di?erent blains,non-destructive and destructive tests such as grain-size distribution of cements by laser-ray, sedimentation, permeability and compressive strength were employed. The results of experimental studies and observations demonstrated a suitable mix-design for upper and lower parts of the cement-grading curve that are of prime importancefor grouting and stabilization. Meanwhile, by increasing the fneness of the cement, the permeability decreases toa considerable extent and the compressive strength increases. Moreover, the blain content close to 5000 cm2/grapplication led to the optimization of the e?ect of void reduction in a grouted soil mass compared to the lower andhigher amount of blain content. The results of various tests indicate that an optimum blain can be used to achievethe designed geotechnical criteria.
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