Mortar Penetration Resistance Apparatus (H-4137) Page 3of 6
Instruction Manual Rev.0; August 14, 2003
Copyright 2003 Humboldt Mfg. Co., Norridge, IL. 60706, U.S.A.
All rights reserved. Printed in U.S.A.
1. Scope
Determines the time of setting of concrete with slump greater than zero by testing mortar
sieved from the concrete mixture. The method is suitable for use only when tests of the
mortar fraction of the concrete will provide the information required. The apparatus can
also be used to determine the effects of variables such as temperature, cement
proportions, additions and admixtures upon the time of setting and hardening
characteristics of concrete. It may also be used as part of performance specifications to
determine compliance with specified time of setting requirements.
2. Assembly
The penetrometer is furnished in a carrying case. To assemble, place the slide indicator
over the graduated shaft. Place the handle on the shaft and tighten in place with the hex
nut. Place the other end of the shaft in the open end of the spring barrel assembly and
tighten the sleeve nut finger tight. To install the needle of various end areas, screw the
needle shank into the tapped hole in the lower end of the spring barrel assembly.
3. Preparation of Specimen
Prepare sample in accordance with either ASTM C403 or AASHTO T197 specifications.
4. Storage of Specimen
Store and maintain the specimen at the desired temperature of test. Prevent excessive
evaporation of moisture. Keep specimen covered with a suitable material such as damp
burlap or a tight fitting, water impermeable cover for the duration of the test, except
when bleeding water is being removed or penetration tests are being made. Specimen
should also be shield from the sun.
5. Number of Specimen
At least three (3) separate batches shall be made for each test condition. One (1) rate of
hardening test shall be made on each batch. An equal number of batches for each
condition shall be made on any given day.
6. Procedure
6.1 Remove bleeding water from the surface of the mortar specimens just prior to
making a penetration test by means of a pipet or suitable instrument.
6.2 Place the container of the specimen on a smooth surface spaced between the feet
of the test operator.
