Humboldt H-3600 User Manual

07.10

product manual

H-3600

Cement Bleeding Apparatus

1. General

This apparatus is used in the test to determine the bleeding rate
and bleeding capacity of cement paste and mortar by a direct and
continuous procedure.

2. Unpacking

The Cement Bleeding Apparatus, Model H-3600 consists of a container
for the paste or mortar to be tested, a collecting ring and a measuring
burette with funnel.

For shipment, the apparatus is disassembled to avoid breakage
during transit. Care should be taken in unpacking to be sure no
parts are overlooked.

3. Assembly

Prior to the start of the test, the constricted capillary, stopcock and
aspirator should be connected to the top of the burette through a
suitable rubber stopper. The burette assembly should be supported
by a ring stand or similar equipment in order that it can be conveniently
raised and lowered over the collecting ring and held rigidly in place
during the test period.

4. Operating Procedure

4.1 Pastes

Immediately after mixing, carefully pour the paste into the sample
container and take the completion of the screening as the start time for
the test. Take care to make certain that the paste height is level with the
edge of the 5" diameter container.

Place the collecting ring approximately in the center of the paste
surface, embed it to a depth of approximately 1/4" and cover the
surface of the paste with carbon tetrachloride to a depth of I-1/4".
Lower the funnel-burette assembly to within 1/4" of and directly over
the collecting ring. Draw carbon tetrachloride up into the burette by
means of an aspirator to a "zero" burette marking and close the
stopcock. Four minutes after the start time, take the first reading, and
take readings thereafter at 2 minute intervals until 30 minutes after the
start time, and at 10 minutes intervals until cessation of bleeding.

To compensate for density changes as increasing quantities of water
gather in the measuring burette, zero the meniscus every 10 minutes
immediately before the appropriate reading for each period.

CAUTION: The bleeding tests should be run in a well-ventilated
room. Take care to avoid spilling carbon tetrachloride and breathing
the vapors. Keep the exposed portion of the liquid surface around
the funnel covered during the test.

4.3 VIBRATION:

Place the bleeding apparatus in a draft-free location and set it on
a sponge rubber mat or equivalent that will serve as a vibration
damper.

4.4 Notes:

Approximately 500 ml of carbon tetrachloride are required per test.
This may be reclaimed by siphoning off the liquid at the end of the
test and placing it in a separating funnel. The carbon tetrachloride
may be tinted with an oil-soluble dye for ease in reading the level in
the burette.

4.5 MORTARS

Immediately following the flow test, remix the mortar remaining in
the mixing bowl for 30 seconds. Within a total elapsed time of not
more than 2-1/2 minutes after completion of the original mixing of
the mortar batch, begin placing the mortar in the sample container.
Place the mortar in three layers, tamp each layer 40 times with the
tamper and strike off the surface level with the edge of the 5"
diameter container by screeding with a steel straight edge. Con­duct the remainder of the test for the paste using as a start time the
completion of striking-off the surface of the mortar in the container.

5. Calculation

5.1 Calculate the initial rate of bleeding as follows, using values
taken during the first 30 minutes of the test when the bleeding
should be proceeding at a uniform rate:

Bleeding rate, cu cm per sq cm per sec = V1/At

Where,

V1 = Volume of bleeding water in cubic centimeters, measured

during time interval t

A = Area in square centimeters covered by the collecting ring, and

t = time in seconds during which bleeding occurs at a uniform rate.

5.2 Calculate the bleeding capacity as follows:

Bleeding capacity, cu cm per cu cm = V2/V3

Where,

V2 = total volume of bleeding water, in cubic centimeters, and

V3 = volume of the cylinder of paste or mortar under the collecting

ring, in cubic centimeters.

5.3 Calculate and report bleeding rate and bleeding capacity values to
the nearest three significant digits.

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