DGSI. Durham Geo Slope Indicator

Mortar Testing

This section introduces products used to evaluate compression, tensile strength, soundness, expansion, and setting time of cement mortar.

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.

cube mold set

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

Mortar Mixer
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
Length Comparator
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
Specimen contact point
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.
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
Specimen holder
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 <
bar mold
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.
Flow table
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.
Mortar Penetrometer
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
Blaine Air Permeability
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
Gilmore apparatus

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.

Portable mixer

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.

Masonry saw