This section introduces products used to evaluate compression,
tensile strength, soundness, expansion, and setting time of cement
mortar. |
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Cube Mold Set
 The
cube mold set is used to prepare 2 in. (51 mm) cube specimens of high
strength materials for compression testing, such as lime, Portland
cement, mortars, capping compound and gypsum. The three gang, in line
mold is made from machined brass and employs polyethylene liners to
contain the samples and eliminate mold clean-up. Supplied as a kit.
Order C-23707 for replacement plastic liners. Applicable Standards:
ASTM C 87, C 109, C 141, C 257, C 267, C 306, C 472, C 379, C 396
AASHTO T-106. Durham Geo also carries bronze and plastic cube molds,
cube test sand, and tensile sand. |
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| Mortar Mixer
 The
mortar mixer is used for mixing cement and mortar pastes. The heavy
duty mixer has 3 operating speeds, lever to adjust the height of
the 5 qt (4.73 L) bowl and a planetary mixing action to ensure thorough
and complete mixing. Supplied complete with a stainless steel bowl,
flat beater and a wire whip. Applicable Standards: ASTM C 305 AASHTO
T-162 |
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Length Comparator
 The
Length Comparator allows measurement of the changes in length of cement/mortar
and concrete test bar specimens. The instrument is provided with substantial
rigidity through the use of a solid frame and cast steel base. The
lower fixed anvil and the upper movable anvil are designed to accept
the cast-in points of the specimen bars. The comparator includes a
precision dial indicator and an Invar steel reference bar. Applicable
Standards: ASTM C 151, C227, C 490, C 531, C 359 AASHTO T-107, T-160
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Specimen Contact Points
 The
precision machined, stainless steel Specimen Contact Points, 0.25
in. diameter and 0.75 in. long, are cast into the specimen cement
bars. They are used as reference points when placed in the Length
Comparator. Applicable Standards: ASTM C 151, C 151, C 227, C 490
AASHTO T-107, T-160 |
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Cement/Mortar Autoclave
 The
Cement/Mortar Autoclave is used to conduct accelerated soundness test
or autoclave expansion test on cement mixtures. Designed to provide
a constant steam pressure, adjustable between 60 to 350 psi (414 to
2413 kN/m2), at a constant temperature. |
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Test Specimen Holder
 The
test specimen holder is used to hold bar specimens in an upright position
when placed in the cement/mortar autoclave. It ensures that each of
up to eight specimens are exposed to the pressurized steam in the
same way. The holder is made from corrosion resistant materials. Applicable
Standards: ASTM C 141, C 151 AASHTO T-107 |
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Bar Molds
 Bar
molds produce standard sized specimens for accelerated soundness testing
using the autoclave. Available in three types for 10 in. (25.4 cm)
long bar specimens. Applicable Standards: ASTM C 141, C 151 AASHTO
T-107 |
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Flow Table
 The
flow table provides an efficient means of determining the flow of
cement pastes and hydraulic cement mortars. A specific volume of material
is molded on the table using the included flow mold. The mold is then
removed and the table subjected to a specific number of 1/2 in. (12.7
mm) drops using the crank handle. The increase in average diameter
of the sample indicates the flow. An electric model is also available. |
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Mortar Penetrometer
 The
mortar penetrometer is used to determine the rate of hardening of
the mortar component of fresh concrete. The mortar is extracted by
sieving. Measurement is made by first attaching one of the six penetration
needles to the calibrated spring dynamometer. The Penetrometer is
then pushed into the sample and the sliding will indicate the maximum
test reading on the handle stem. |
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Blaine Air Permeability Apparatus
 The
Blaine Apparatus is used to determine the fineness of Portland cement.
The fineness is measured in terms of the specific area of cement expressed
as total surface area in square centimeters per gram of cement. The
apparatus consists of a stainless steel test cell incorporating a
perforated disc and plunger with a ground joint for the test cell
to attach to a calibrated U-tube manometer. A stopcock and rubber
bulb are attached to the manometer to provide a means to draw a definite
air volume through the test cell. It is supplied with an 8 oz (240
ml) bottle of red manometer fluid, filter paper, a wood block to hold
the test cell during filling and a funnel. It is mounted on a finished
wood panel. Applicable Standards: ASTM C 204 AASHTO T-153 |
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Gilmore Apparatus
 The
Gilmore Apparatus determines the time of set for cement. It comprises
a rigid aluminum and steel frame with two precisely machined stainless
steel points and associated weights. Applicable Standards: ASTM C
91, C 141, C266, C 266 AASHTO T-154 |
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| Portable Mixers
 Portable
Mixers are used in the laboratory to prepare concrete or cement/mortar
batch mixes. They have a dry batch capacity of 3 cubic feet (85
L). Optional wheel kit available to move mixer about laboratory.
Inquire as to other models available as special orders from 1-1/2
to 9 cubic ft. and powered by either electric motor or gasoline
engines. |
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Masonry Saw
 The
C-825, Electric Masonry Saw, accepts a 14-in diameter blade with
a 1-in diamater arbor. The saw can be used for wet or dry cutting
of concrete, cores, blocks, rock and masonry. A 5 hp gasoline engine
version is also available.
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