Preparation of epoxy impregnated sand coupons for image analysis

The study of sand structure using image analysis is an emerging area in soi l mechanics research. Quantification of parameters such as the local void r atio distribution or the orientation of sand known to directly affect the b ehavior of sand masses is possible. However, accurate quantitative measurem ent requires high-quality specimen coupon surfaces for imaging. A comprehen sive procedure for preserving sand specimens with epoxy resin and preparing specimen coupon surfaces for image analysis using a variety of grinding an d polishing procedures is presented. Factors affecting the accuracy of subs equent image analysis measurements are discussed. Example images obtained u sing the proposed procedures are presented to demonstrate their effectivene ss and potential.