Haridarshan Instru-Lab

Sarkhej, Ahmedabad, Gujarat

the consistency and workability of concrete is a very important factor and is strictly connected to the water/cement ratio, to the effect of admixtures and finally to the strength and quality of concrete. Suitable for concrete mixes of high and very high workability. To perform this test, a sample is placed on a metal surface which is then raised and dropped through a known height.

general description and specification:as per is: 5512. For cement mortar and lime

the flow table consists of a brass table top 250 + 2.5mm dia mounted on a rigid stand. The table top is reinforced with equally disposed ribs and allowed to drop through 12mm by a ground and hardened cam, complete with mould 100mm base dia, 70mm top dia and 50mm high. The cam shaft is rotated at the rate of 100 rpm by an electric motor. Suitable for operation on 230 volts 50 cycles. Single phase, a.c. Supply. Manually operated flow table also available.

as per is:199 for concrete:

the flow table consists of a brass or mild steel table top of 76.2 cms(30")dia, finely machine from a solid brass casting or mild steel plate. The stand is fabricated out of cast iron/mild steel and is of study construction. The ground and hardened steel cam is designed to drop the table by 12.5mm. Complete with flow mould with handles with one tamping rod 0-60 cms long x 16cm. Electrically operated to raise and drop the table top. Approx. 15 times in 15 seconds. Suitable for operation on 230 volts, 50 cycles, a.c. Supply. Manually operated flow table also available.

optional accessories :

concrete scoop

air content of fresh concrete is normally measured, by the use of a special air meter, to assess whether the concrete contains the required amount of air. This would be measured when airs entrapment or entrainment is required by the concrete design. The method uses the principle of replacing the air in a known volume of concrete with water, the volume of which can then be measured.

general descripation & specifications

the apparatus consists of a pressure tight flanged cylindrical measuring bowl of specified volume in accordance with size of aggregate to be tested. The bowl is fitted with a removable flanged conical cover assembly with the help of a airtight sealing gasket. The conical cover has an air valve and a pet cock for bleeding off the water. A transparent cylindrical stand pipe, which is graduated in air content, is fixed to the conical cover assembly.
pressure is applied to the specimen with the help of pressure bulb and the pressure is recorded on the pressure gauge which is mounted on the stand pipe. The whole assembly is mounted on a flat base.

standard accessories :

calibration cylinder with spring clamp, trowel, tamping rod, straight edge, rubber mallet andmeasure. 1 no. Each

Although generally not such an important property of concrete than compressive strength, tensile strength values are often important to know when the concrete used free of reinforcement and may be subjected to some tensile force. The test method essentially involves applying a load at the centre of a beam of concrete supported at its ends. The load required to break the specimen is then recorded.

Salient Features:

The machine consists of a motorized load frame. The lower platen has two rollers, the distance between which is adjustable. For 150 mm x 150 mm x 700 mm beam, the centre distance between the rollers is 600 mm, while it is 400 mm for beams of size 100 mm x 100 mm x 500 mm. The upper platen has also a pair of rollers whose distance adjustable. It is 200 mm centre to centre, for 150 mm x 150 mm x 700 mm size beam and 133 mm for 100 mm x 100 mm x 500 mm size beam. Total capacity of the machine is 100 KN. 150mm dia pressure gauge of 0-100 KN x 1 KN least count to indicate load is fixed on the load frame. A separate electrically cum hand operated pumping unit housed in a cabinet is supplied. On/Off switch and a slow/fast lever to control rate of loading are fitted on the front panel of the pumping unit. A facility for hand operation is provided. A micro switch and relay fitted inside the pressure gauge protect the unit from over loading.

Hand operated version consists of a load frame. A small hand pumping unit is attached to the load frame. Since this is a hand operated light weight machine. It is useful for field laboratory also.

Optional Accessories (at extra cost):

• Spare Oil seal
• Hydraulic Oil ( tin of 5 ltrs)
• Beam Mould 10 X 10 X 50 cm
• Beam Mould 15 X 15 X 60 cm
• Beam Mould 15 X 15 X 70 cm
• Beam Mould 15 X 15 X 75 cm
• Trowel
• Concrete Scoop

Often, existing concrete structures will need to be examined and tested to ensure the concrete remains of adequate strength and durability. Rebound hammer surveys can be conducted to provide a rough estimate of concrete strength, where it is not possible to determine this by more accurate means such as core extraction and testing.

The test involves using a special rebound hammer, which measures the recoil of a piston against the concrete surface when a standard force is applied. This recoil can then be correlated approximately to concrete strength.

General Description & Specifications

The rebound hammer consists of a barrel in which is housed a hammer mass attached to an impact spring which slides on a guide bar. A plunger is attached to the guide bar which is pressed against the surface to be tested. As the piston is pressed against the surface to be tested, on reaching the compressive strength, the hammer mass is released and rebounds to a certain extent, according to the strength of the surface, which is indicated by a rider on a calibrated scale. A lock button fixed on the body of the hammer lock the rider in place and the rider can be reset to zero Position by using the same button. The equivalent compressive strength can be computed from the chart supplied. It is suitable for specimen of compressive strengths 100-700Kg/cm. The instrument, complete with a grinding stone for polishing the test surface, is supplied in carrying case.

In the process of compaction, efforts are only directed to reduce voids in the compacted concrete. The Vibrators produce vibrations which when transmitted to plastic concrete make it to flow and affect compaction. The air bubbles are forced out of concrete due to vibrations.
The Needle Vibrator, also known as immersion or poker vibrator have a power unit and long flexible tube at the end of which a vibrating head is attached. Wherever compaction is to be done, the vibrating head is inserted in the concrete.

GENERAL DESCRIPTION AND SPECIFICATIONS

The Laboratory needle vibrator having 350mm long X 25mm dia Needle is used in vibrating concrete test cylinders and beams in the field or laboratory. It is also widely used in making laboratory specimens, in making concrete products, in experimental works, and in small scale construction project. It has 1 meter long flexible shaft and is powered by 1 HP single Phase Electric motor.
The Needle vibrator for compaction of mass concrete has 40 or 60mm dia needle with 6 meter long flexible shaft and powered by 3 HP Electric motor for operation on 440 Volts, 3 phase, 50 cycles, A.C. Supply. Optionally, the Vibrator can also be fitted with Petrol/kerosene or Diesel Engine for field use.

OPTIONAL ACCESSORIES

Spare Needle with shaft

Cubes of fresh concrete are made to test a variety of properties on the eventually cured and hardened concrete. Fresh concrete is subjected to a standard compaction regime in the cube mould and is then normally initially cured under specific laboratory conditions. The moulds are manufactured, subject to tight dimensional, hardness, square ness and surface finish requirements.

General Description & Specifications

Complete with base plate. The faces of the mould are machined flat to +/- 0.02mm accuracy and finished to within +/- 0.2mm of specified dimensions. Material for construction of moulds is Cast Iron or Mild steel. The moulds are stout enough to prevent distortion and facilitate the removal of the moulded specimen without damage. The Moulds are so machined that when they are assembled ready for use, the dimensions and internal faces are accurate within the specified limits. Internal faces of the moulds are smooth.
The base plate is attached to the mould by cleats .The parts of the mould, when assembled, are positively and rigidly held together during filling, subsequent handling and vibration where applicable.
SIZES AVAILABLE : 50MM/ 100MM/ 150MM

OPTIONAL ACCESSORIES

SPANNER FOR DEMOULDING AND MOULDING, TAMPING ROD WITH SAUQRE FACE.

CUBE MOULD 7.06 CMS(FOR CEMENT MORTAR)

As per IS : 10086-1982, The cube mould is so constructed so as to facilitate separation into two parts. The mass of the mould together with the base plate will be 2.8 +/- 0.2 kg. Material for construction of these moulds is mild steel.

BEAM MOULDS

For casting concrete specimens for flexural tests. The mould is made of 4 plates assembled together. Each mould with base plate, made of Mild Steel. Faced are machined flat to +/-0.2mm and finished in size to 0.2mm. AS PER IS: 516

A concrete mixer is a device that homogeneously combines cement, aggregate such as sand or gravel, and water to form concrete. The mixer uses a revolving drum to mix the components. Uniform and thoroughly mixed batches can be produced in field or Laboratory. Inevitable for Mix design formulation.

General Descriptions & Specifications

The Concrete Mixers are available in two versions for Laboratory or field use. The field models are hand operated. This portable concrete mixer has rubber tyred wheelsand a towing tongue so that it can be towed and moved around by hand. Its rotationis powered by single-phase electric motor or by hand . The lever allows the concrete to be tipped into a wheel-barrowor mixing pan. The driving shaft is mounted on sealed ball bearing The counter balanced drum swivels and tilt 360 for easy and complete discharge.

Specifications Optional Accessories

Wheel Barrow, Mixing Pan, concrete Scoop.

We are engaged in providing high quality Vernier Transit Theodolite for the clients. The Vernier Transit Theodolite is a dependable companion for surveying needs. The Vernier Transit Theodolite has a self contained construction so that all sensitive parts are protected from dust and moisture. Our Vernier Transit Theodolite is equipped with high quality optics to give clear & sharp image. Size 175mm, Internal focusing type, Coated optics ERECT - IMAGE for direct reading, Confirming to I.S. Specifications No. 2988-1975, Wattss Pattern, Fitted with shifting tribratch and Optical- Plummet arrangement. The instrument is of self contained construction so that all sensitive parts are protracted from dust and moisture. The instrument is equipped with high quality optics to give clear & sharp image. Magnification 23 times All optical parts are blue coated to delete the glare & reflection. Sights are fitted on the telescope to facilitate quick alignment of the levelling staff. The verniers and circles are graduated to 1020 Seconds accuracy & are covered with glass windows to avoid dust and moisture. The eye-piece of the telescope helical type and is suitable for quick setting. The instrument is made from carefully selected brass and gunmetal for convenience in operation and the ability to withstand continuous usage under all conditions without effecting the accuracy or adjustment. The verniers & circles are graduated on embedded Sliver and are covered with glass window. Supplied with all Standard accessories in highly polished wooden box with Special Aluminium Telescopic Tripod Stand.

The digital compression testing machine has been designed to meet the need for a simple, economic and reliable means to test concrete for its compressive strength. The design expressive of simplicity, both of construction and operation, makes the machine easy to use and maintain. The unit is compact, making it useful for site and Laboratory applications. The digital machines are provided with a pace rate controller, to enable maintain a constant of loading.

Features

• High stability four column load frame
• Each frame tested for stability and alignment to avoid tension failure during a test and to ensure centre loading
• Standard Platens for 3 X 6/ 4 X 8 and 6 X 12 cylinders included.
• A precise large diameter spherical upper platen for optimum results
• Variety of optional accessories for cubes, blocks, bricks and flexure test available
• Motorized hydraulic power pack or pumping unit with rapid approach and automatic overload protection
• Comes standard with safety Guards on all four sides.

The Complete unit comprises a Loading Unit which is of fully welded or two pillar model construction having a cross-head with a spherical seated platen. The lower platen is attached to the top of the piston. The Loading capacity is of 2000 KN, Cubes up to 200 mm & Cylinders up to 150 mm Dia X 300 mm Height can be tested using the appropriate spacers.

Pumping Unit with choice of compact power pack attached closely to the loading unit or separate hydraulic pumping unit, attached to the loading unit by high pressure hydraulic flexible hose pipe. The pump facilitates rapid approach of the platens for daylight closure and also provides comprehensive control over the application of load. A control valve provides fine control over the loading rate for accurate pacing.

Maximum load is held and retained for approx. 15 min, unless cancelled, using the panel mounted reset switch. Pace rate set for running the test can be maintained manually.

Model With digital Readout and pace rate Controller

Optional Fittings

• Digital Load indicator with RS 232 interface for connection to windows XP based computer system
• Digital Load indicator with printer interface
• Batteryback up for Digital Load indicator in case of power failure
• Additional Pressure Gauge as `stand by` load indicator for emergency use in case of power failure
• Spare Oil seal
• Flexural test attachment (to be ordered at the time of purchase of machine.) Can be accommodated later on, only if request received at the time of placement of order
• Brick test attachment
• Block testing attachment
• Spacers to accommodate small size cubes and cylinders
• Hydraulic Oil
• Ram extracting tool

These proving rings are made out of special steel, carefully forged to give maximum strength & machined to give the highest sensitivities commensurate with high stability and to ensure long life and accuracy. All proving rings are integral type viz. the loading (outside) bosses are forged integral with the ring body. This ensures that there is no possibility of abutment shift and consequent loss of accuracy in reading that always exists in rings with bolted abutments. The dial gauge and anvil are mounted on U-brackets clamped to the ring body by Allen set screws. The dial gauge is fitted with a special back cover and threaded bush which does not permit any shift from the original diametric alignment, coaxial with the loading boss centers, that is set at the factory before calibration. For all compression proving rings and tension compression proving rings up to and including 5 kN capacity (a little over 500 kgf) the loading bosses have female threading, 12" B.S.F. (16 t.p.i.) The boss faces are ground and polished and are lane parallel to within 0.02mm.total D.T.I. run-out. Caps are provided for use when loading in compression. Repeatability is as stipulated in IS : 4169-1967. The rings are supplied complete with dial gauge and our own calibration chart, packed in polished wooden boxes.

The Vibrating Table produces better concrete Moulds and cylinders by removing entrapped air. It distribute concrete evenly inside the moulds and nearly eliminate the problems of bug holes and air bubbles.

General Description and specifications :

The Vibrating table is entirely constructed of thick steel. The table top is made of thick mild steel plate and has stops along its edges to prevent moulds from walking off the table during operation. A cross arm adjustable on a vertical rod at the centre of the table is provided to hold the moulds while operating the table. The variable pitch pulley arrangement permits the variation of frequency between maximum of 3600 vibrations down to 2600 vibrations per minute. A speed regulation handle is provided for increasing or decreasing the frequency. The vibrator is mounted on cushioned steel vibrating deck. A switch is provided for starting the motor. Operation on 440 V, three phase, A.C. supply.

Table Sizes

• 50 X 50 CMS
• 60 x 60 CMS
• 75 x 75 CMS
• 100 x 100 CMS

Hand Operated :

Hydraulic Jacks are of multipurpose utility i.e. application of loads while engaged in field investigation, determination of load carrying capacity of piles in the field, tensioning of wires in pre-cast structures, loading of members of any structures for deformation characteristics. For applying loads for various test in field or laboratory. Hydraulic Jack hand operated with separate pumping units. These jacks are portable available in various capacities. The pumping unit is connected to the hydraulic jack by means of a flexible connecting pipe 2 meter long. The jack is fitted with lifting handles for easy transportation. The approximate lift of the ram is 90 to 120 mm. The pumping unit is a single plunger type with detachable handle. The unit is fixed on a channeled base which is fitted with lifting handles. A pressure release valve is provided on the pumping unit. The load is indicated on a 15 cm dial hydraulic pressure gauge of appropriate capacity which can be detached from the pump when not in use. The least count of the calibrated dial will be according to the capacity of the gauge (Normally 100 divisions for full capacity). Lift of ram - 150 mm.