Improvement of Water Stability of Sand Admixed with Water-Soluble Organic Polymer

Figure 13

The scanning electron microscope images of the PU-sand mixture: (a) with 4% PU at 100x magnification; (b) with 2% PU at 100x magnification; (c) with 2% PU at 50x magnification; (d) with 1% PU at 50x magnification.

(a)

(b)

(c)

(d)