| Civil Engineering Testing Equipment |
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Abrasion Testing Machine
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Abrasion testing machine is used to test crushed rock, crushed slag and uncrushed gravel for resistance to abrasion. The machine determines the resistance to wear of small size coarse aggregates and crushed rocks.
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Salient Features
The important features and specification of abrasion testing machine are :
- The machine comprises of a hollow cylinder, which is horizontally mounted on a strong frame on ball bearings.
- The machine is supplied with abrasive charges consisting of a set of 12 hardened steel balls having approximately 48 mm diameter.
- The cylinder has an opening, which can be closed with a dust tight cover to promote charging and discharging the cylinder with the material under test.
- It consists of a detachable extension that extends throughout the interior of the cylinder and prevents it from falling on the cover.
- The cylinder is rotated by an electric motor through a heavy reduction gear.
- A revolution counter is attached to the frame and provided with tray for collection of materials at the end of the test.
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Aggregate Crushing Value Apparatus
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This equipment is used to determine crushing properties of aggregates. The aggregate crushing value indicates the ability of an aggregate to resist crushing. The lower the value, the stronger the aggregate, that is the greater is its ability to resist crushing.
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Applications
The aggregate crushing value provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. The important application area of the equipment are :
- Cement & Concrete industry
- Construction (Building, Roads, Bridges, Dams, etc.)
- Mining
- Ceramic Industry
- Calibration Laboratories/Test Houses
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Aggregate Impact Tester
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Aggregate impact tester is an equipment used to determine the impact value and resistance of aggregate to sudden shock or impact. Aggregate impact value gives the relative strength of aggregates against impact loading.
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Applications
Aggregate impact tester finds application in the following industries:
- Construction (Roads, Bridges, Dams, Buildings, etc.)
- Cement
- Ceramics
- Chemicals
- Mining
- Irrigation
- Calibration laboratories/Test houses
- Research & Development
- Education
- Railways
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Aluminium Tripods
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The aluminium tripods are very useful while conducting surveys. They are designed to be used with any Automatic Level or for any application where all metal construction and light weight is advantageous. They easily fit into Total stations, Digital theodolite, Auto levels and Dumpy levels.
Generally, wooden tripods are recommended for precision surveys to minimize errors because of expansion and contraction due to heat and cold.
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Application
Tripods are mainly used as support stand for other survey equipment like auto levels, total stations etc. They find application in following areas :
- Land Surveying
- Road Mapping
- Construction
- Photography
- Film Production
- Environmental Surveys
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Asalpht & Concrete Floor Saw
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This type of saw is used for cutting wet or dry asphalt and concrete. They are designed for breaking out asphalt and concrete. It has versatile applications and are suitable for high production green sawing, asphalt; and cured concrete applications.
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Applications
- Concrete & asphalt industry
- Construction industry
- Road repair
- Floor sawing
- Trenching
- Pile cutting
- Demolition
- Bridge work
- Pipe cutting
- Brick & Tile cutting
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Auto Level
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Auto Level is an equipment suitable for all surveying and engineering level applications. They are used to obtain accurate levels in surveys. They are designed for accuracy, ease of operation and rugged dependability. They give maximum portability. This is also supplied with aluminium telescopic tripod stand.
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Application
Auto Level are mainly used to obtain accurate leveling. Some of its application are :
- Excavation
- Optical Surveys
- Topographic Surveys
- Construction (Buildings, Roadways, etc.)
- Mapping
- Defense
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Ball Mill
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Ball Mill is used to pulverize, grind and mix wet or dry ceramic, cement or any other materials.
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Salient Features
- Complete with guard, motor and built-in motor switch, the unit is safe, self-contained and easy to use.
- Ball mills have a capacity up to two one-gallon jars. The ball permits easy production of studio batches and study of industrial techniques.
- There are rollers that are rubber-covered for their entire 24" length, quiet, smooth running.
- There are special hard porcelain jar mills that rotate smoothly on rollers, thus providing even blending.
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Benkelman Beam
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Benkelman Beam is an apparatus, which measures the deflection of a flexible pavement under moving wheel loads. This is a simple device and forms the basis of empirical diagnosis of pavement defects.
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Salient Features
- The equipment is light weight and made of aluminium for easy portability and use at any test location.
- Length of the Benkelman beam is 250cm and net weight is 15kg.
- The apparatus is compact, unique and possess a telescopic design for quick set up and storage during transport to the test location.
- The equipment is supplied in two parts for assembling on site with easy hand tools .
- One end of the beam rests at a point under investigation while the beam is pivoted in the centre.
- The free end carries a dial gauge to record the deflections. The other end is kept on a stable platform.
- Provided with anti-vibration system for accurate measurement of pavements.
- Provided with dial indicator and accessories.
- The beam is put in contact with the pavement under test between the tires of the vehicles.
- The measurement of the deflection is carried out when the vehicle passes over the test area.
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Blaine's Air Permeability Apparatus
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The apparatus is used for determining the fineness of cement in terms of specific surface expressed as total surface area in square centimeters per gram of cement. This is a variable flow type air permeameter.
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Salient Features
- The apparatus consists of a "U" tube manometer with a built in stop cock, a stainless steel permeability cell, a perforated metal disk, a stainless steel plunger, a rubber stopper, and a rubber tube with rubber bulb.
- The apparatus is mounted on a finished wood panel with rubber-footed base.
- Consists of a packet of 12 filter paper discs and a bottle of 100 cc dibutylphthalate liquid.
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Cement Sampler
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Cement sampler is a brass tube, which is used to sample cement in bulk storages or shipment.
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Salient Features
- It consists of two brass concentric tubes with slots.
- The inner slot rotates to close the slot and collect sample.
- The sampler is approximately 53 cm long and 2.8 cm wide provided with a wooden handle.
- The tube has a sharp angular edge, which easily pierces cement bags.
- An air hole of approximately 3 mm diameter is drilled near the handle.
- The total sample collected at a time is approximately 3 litres.
- The sampler has diameter of 40 x 1500 mm and its weight is 5 kg.,
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Cement Tensile Testing Machine
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The machine is mainly used to conduct tensile strength examination of cement. The tensile testing method allows tensile strength determination of a hydraulic cement mortar by casting and testing cement briquette specimens.
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Salient Features
- The hand operated cement tensile testing machine has automatic loading system by lead shots.
- The machine is suitable for tensile test of cement up to 540 kg.
- The equipment is provided with a Brass briquette mould with base plate and lead shots.
- The hand operated machine is also supplied with two calibrated scales.
- Electrically operated tensile tester uses an accurate, friction free, double lever loading system. The load is applied by means of sliding weight on the top lever.
- The capacity of the unit is 900 kilograms.
- Provided with a micro-switch, which stops the machine immediately on failure of the briquette.
- The equipment can be used for subsequent tests only after the sliding weight is adjusted to its zero position.
- The machine is suitable for operation on 230 volts, 50 cycles, single phase A.C. supply.
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Centrifuge Extractor
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This equipment is used to determine and check bitumen percentage in bituminous mix. It is used for a quantitative determination of bitumen in hot-mixed paving mixtures and pavement samples.
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Salient Features
- The apparatus consists of a removable cast aluminium rotor bowl of capacity 1500 g, mounted on a vertical shaft.
- There is a filter paper disc, pressed in between the rotor bowl and cover plate by a knurled nut.
- The bowl assembly is enclosed in a housing mounted on a cast aluminium body.
- The bowl and shaft are rotated fast manually by enclosed gears in the cast body and handle.
- The gears operate in oil bath with splash lubrication.
- Solvent is introduced during the test through the holes in the cap of the housing.
- A drain is provided to collect dissolved bitumen coming out of the rotating bowl and getting collected in the housing.
- Provided with filter paper discs and Benzene.
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Compaction Apparatus
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A compaction apparatus or compactor is usually a motor driven machine useful for soil compaction into 100 mm or 150 mm diameter moulds. Compaction and penetration test on soil is very essential and every soil laboratory conducts compaction tests nowadays.
Compaction of soil, whenever and wherever laid, is of utmost importance to ensure longevity and strength of the structure built over it throughout the designed life of the structure. Good compaction of soil results in minimising of its settlement on application of load, increases its density thus increasing its shear strength and decreases its permeability leading to a fall in its water absorption and reduction in its swelling or shrinkage.
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Application
Application in different industries as well as in different areas like :
- Construction (Dams, Buildings, etc.)
- Civil Engineering
- Geotechnical Engineering
- Trench Monitoring
- Concrete Sampling
- Agriculture
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Compaction Factor Apparatus
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Compaction Factor Apparatus is a useful tool for testing concrete mixes of very low workability such as those normally used when concrete is to be compacted by vibration. The apparatus is used for determining the workability of fresh concrete, provided the maximum size of the aggregate does not exceed 38 mm.
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Salient Features
- The apparatus consists of two rigid conical hoppers and a cylinder installed on a rigid metal frame.
- Provided with a circular metal plate to cover the top of the cylinder.
- The lower opening of the hoppers are fitted with hinged trap-doors having quick release catches.
- The apparatus is supplied complete with one plaster's trowel and one tamping rod, whose one end is rounded.
- The inside surfaces of the apparatus are machined smooth.
- The whole apparatus is furnished in hammertone spray
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Compression Testing Machines
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The machine is used to conduct compression tests on concrete specimen up to 20 cm diameter and 30 cm height, by applying some load on it. One of the very important aspect that needs to be considered during construction is the strength of concrete. Strength of concrete is determined by crushing the specimen in the form of cubes or cylinders. Concrete is carefully designed for a particular compressive strength by engineers and specimen is tested in a compression testing machine.
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Salient Features
- Generally, a compression testing machine consists of a load frame with suitable platens and a pumping unit with pressure gauge, either hand operated or electrically-cum-hand operated.
- Load Frame and pumping unit are connected by pressure pipes.
- There are different models of compression testing machines available in the market.
- Hand operated machine is a compact and self contained, designed for portability, operating convenience and accuracy.
- Portable unit is ideally suited for mobile and field laboratories.
- The electrically operated machine has a hydraulic jack that is fixed to base.
- It is provided with a motorized driving unit.
- The electrically operated machine is fitted with a hand wheel control, which enables the rate of application of load to be varied. The machine is equipped with facilities for hand pumping in case of power failure.
- Generally, the machine meets the essential requirements of various Indian, British & American standards for compression tests.
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