Column segregation (stability)

This test evaluates the static stability of a concrete mixture by quantifying aggregate segregation. This test consists of filling a 26 in. (610 mm) high column with concrete. The column is sectioned into three pieces, as shown in Fig. 2.12. The concrete is allowed to sit for 15 minutes after placement. Each section is removed individually and the concrete from that section is washed over a No. 4 (4.75 mm) sieve and the retained aggregate is weighed. A non-segregating mixture will

Fig. 2.12 Column segregation testing apparatus for SCC.

have a consistent aggregate mass distribution between the top and bottom sections. A segregating mixture will have a higher concentration of aggregate in the lower section.

Updated: 15 сентября, 2015 — 4:41 пп