OPErATiNg MANuAl
Operating manual
“K-Slump” Tester
HM-65
HM-65
operating instructions:
1. Wet the tester with water and shake off the excess.
7. Report the results as K - W, i.e., (e.g., K3.0 - 2.5).
2. Raise the measuring rod, tilt slightly and let it rest on the
pin located inside the tester.
3. Level the surface of the concrete and insert the tester
vertically down until the disc floater rests at the surface
of the concrete.
8. Wash the tester with water.
NOTE: DO NOT rotate the tester while inserting or
removing it from the concrete.
4. After 60 seconds, lower the measuring rod slowly until
it rests on the surface of the concrete that entered the
tube and read the “K-Slump” directly on the scale of the
measuring rod.
5. Raise the measuring rod AGAIN and let it rest on its
pin.
6. Remove the tester from the concrete vertically up, and
AGAIN lower the measuring rod slowly until it touches the
surface of the concrete retained in the tube and read the
workability (W) directly on the scale of the measuring rod.
9. The first reading is approximately equivalent to the actual ordinary slump, while the second reading (W) is a
measure of workability and compaction. The greater the
value (W) is, the better the workability and compaction
of the concrete will be. The differential between K and W
should NOT exceed 2.0 so as to minimize segregation.
10. The tester can be inserted in a compacted 6x12in
(15x30cm) cylinder, in buckets, wheelbarrows, ready-mix
truck chutes, slabs, columns, beams and any other desired
location where the fresh concrete is placed. Make sure
there is a minimum of 6in (15cm) of concrete around the
tester and that the floater rests freely on the surface of the
concrete. When the tester is used in buckets, wheelbarrows and ready-mix truck chutes, tamping gives a more
uniform result.
11. If a tester is used in a standard cylinder, tap the cylinder
lightly (about 20 times) with the compacting rod or the
tester to close the hole that was left in the concrete upon
removal of the tester. The strength of the cylinder will be
altered by about 2% only.
(Continued on back.)
Rev: 08/04/2011
PHONE: 800-444-1508
740-548-7298
P.O. Box 200, Lewis Center, Ohio 43035-0200
E-mail: [email protected] Website: www.globalgilson.com
FAX:
800-255-5314
740-548-5314
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