PART C - SLUMP TEST
METHOD AND EQUIPMENT
This test method covers the procedure to use both in the laboratory and in the field to determine portland cement
concrete consistency. Although not a precise method, it gives sufficiently accurate results. The slump test does
not apply if the concrete contains aggregate much larger than 2 inches in size.
The metal mold and tamping rod are available in the mobile laboratory.
This is a No 16-gauge galvanized, metal mold shaped like a 12-inch-high truncated (cut off) cone having an 8-
inch-diameter base and a 4-inch-diameter top (see Figure 1-8). Both the base and top are open parallel to each
other and perpendicular to the axis of the cone.
Figure 1-8. Measuring slump.
The tamping rod is 5/8 inch in diameter and 24 inches long and has a 1-inch taper at one end terminating in a
rounded tip bullet nose having a radius of about 1/4 inch.