Humboldt H-4134 User Manual

08.09

product manual

H-4134

Concrete Pocket Penetrometer

General Information

Lightweight, spring-reaction type concrete penetrometer for field and lab
evaluation of the initial set of concrete mortar, based on ASTM C403.
Penetration plunger has a 1/20 sq. in. tip area. Plunger is steadily pushed
into the mortar to a 1 in. depth, as indicated on the shaft, at periodic
time intervals. Penetrometer’s calibrated range is 0-700psi. Resistance in
psi is indicated on the scale. The term “initial set” is the semi-hardened,
partially hydrated condition of the concrete beyond which it can no longer
be worked. The point of initial set is reached when the penetration value
is 500psi. Meets ASTM C780.

The H-4134 Concrete Mortar Penetrometer is used for field and laboratory
evaluations of the initial set of concrete mortars. The Penetrometer can also be
used on light-weight concrete, special roof mixes and concrete additives.

“initial set”of concrete is reached when the penetration resistance is 500 psi

(3,448 kPa).
concrete beyond which it can no longer be worked or consolidated by vibration.
The test involves forcing the Penetrometer's shaft into the mortar to a depth of
I" (25.4 mm) at constant rate and time intervals. The resistance in psi is shown on
the Penetrometer's direct-reading scale.

The 38-2695 (CT-421A) Concrete Mortar Penetrometer incorporates the following
features:

• Direct-reading scale from 0 to 700 psi

• Indicator sleeve which holds reading until released

• Lightweight, pocket-size design

• Convenient belt-loop style, canvas carrying case

“Initial set” is the semi-hardened, partially hydrated condition of the

Test Procedure

A. Holding the sleeve of the penetrometer, slide the indicator ring towards

the sleeve until the ring touches the sleeve.

B. Positioning the shaft at right angles to the concrete mortar surface, force the

shaft into the mortar to the 1" (25.4 mm) depth mark, scribed on the shaft.

C. Pull out the penetrometer and take the reading on the scale at the low-reading

edge of the indicator ring.

D. Before doing another test, slide the indicator ring to the sleeve edge.

E. Take several readings and calculate the average value in psi or kPa if desired.
NOTE: Immediately after each penetration test, clean the shaft by wiping off the

wet mortar with a piece of cloth.

Specifications:

Shaft Needle: Steel 1/20 sq. in. in surface area
Range: 0 to 700 psi

Scale: Direct-reading; indicator sleeve holds reading until released

Dimensions: 3/4" (19mm) dia. x 7" (178mm) long

Carrying Case: Canvas, with belt-loop

Weight: Net 8 oz. (227g)

Foot for H-4134 Penetrometer— H-4134F
(Sold Separately) For use with masonry mortars

to determine board life and initial consistency.
Method can be used as a basis for acceptance
of mortars. Stainless steel disk, 2.70"
(68.58mm) dia. Meets ASTM C780.

Warranty

Humboldt Mfg. Co. warrants its products to be free from defects in material or
workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co.,
factory replacement of any part or parts of such product, for the warranty of this
product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions
of Sale. The purchaser is responsible for the transportation charges. Humboldt
Mfg. Co. shall not be responsible under this warranty if the goods have been
improperly maintained, installed, operated or the goods have been altered or
modified so as to adversely affect the operation, use performance or durability
or so as to change their intended use. The Humboldt Mfg. Co. liability under
the warranty contained in this clause is limited to the repair or replacement of
defective goods and making good, defective workmanship.

Humboldt Mfg. Co.

875 Tollgate Road
Elgin, Illinois 60123 U.S.A.

Testing Equipment for

HUMBOLDT

www.humboldtmfg.com

U.S.A. Toll Free: 1.800.544.7220

Voice: 1.708.456.6300

Fax: [phone]

Email: [e-mail]

Construction Materials