Leishangthem International

Shakarpur, Delhi

Nord Test NT-Build 492 Test Apparatus Originated in the Nordic Countries Nord Test is a trademark of conformity assessment. The emphasis of Nord Test is to develop, promote and innovate Nordic test methods and pre-normative activity. SCOPEThis procedure is for determination of the chloride migration coefficient in concrete, mortar or cement-based repair materials from non-steady-state migration experiments. FIELD OF APPLICATIONThe method is applicable to hardened specimens cast in the laboratory or drilled from field structures. The chloride migration coefficient determined by the method is a measure of the resistance of the tested material to chloride penetration. This non-steady-state migration coefficient cannot be directly compared with chloride diffusion coefficients obtained from the other test methods, such as the non-steady-state immersion test or the steady-state migration test. SAMPLINGThe method requires cylindrical specimens with a diameter of 100 mm and a thickness of 50 mm, sliced from cast cylinders or drilled cores with a minimum length of 100 mm. Three specimens should be used in the test. TEST METHODAn external electrical potential is applied axially across the specimen and forces the chloride ions outside to migrate into the specimen. After a certain test duration, the specimen is axially split and a silver nitrate solution is sprayed on to one of the freshly split sections. The chloride penetration depth can then be measured from the visible white silver chloride precipitation, after which the chloride migration coefficient can be calculated from this penetration depth.

We are bracketed with well-reckoned Manufacturers, Exporters and Suppliers of precision-engineered Rapid Chloride Permeability Test Apparatus. Renowned for its swift functionality and long service life, our Rapid Chloride Permeability Test Apparatus is the best in the market. We provide it in varied specifications and offer individually tailored ones as well. Interested customers can get Rapid Chloride Permeability Test Apparatus customized as per requirement and place bulk orders as well.

More About Rapid Chloride Permeability Test Apparatus : Concretes incorporating fly ash or silica fume are less permeable to deleterious elements and thus are more durable than conventional concretes. The Rapid Chloride-ion Permeability Test (RCPT) was designed to assess the resistance of concrete to the penetration of chloride ions, an indicator of its permeability.

 

Description :

• LI- RCPT-1 - With a provision for tests on 3 specimens simultaneously. The Power supply unit for this model supplies a constant Voltage of 60 V DC and displays the Current in milliAmperes in each channel on large bright digital readouts on the unit front panel. These are to be recorded manually every 30 mts. by the operator.  This is our most popular model preferred by universities and institutions where economy along with simplicity is required.
• LI- RCPT-3 - This model - a result of further R & D, allows conducting tests on 4 specimens simultaneously. The Automatic Data Acquisition unit ( DAQ) supplies a regulated DC current of 60 V (with provision for +/- adjustment), displays the process values ( Current & Cell temperature parameters ) in real time and stores this data every 5 minutes (user settable interval). The programmed unit shuts the test off once the user specified period (factory setting - 6 hrs.) is over. After the test, the user simply removes the storage device ( special pen drive) from the DAQ unit and connects it to the PC / Laptop where the data in X-cel format can be studied and further worked with.

Procedure :

• The concrete cylindrical specimen - 50 mm thick is first prepared by coating the dry surface with a special sealer and then vacuum conditioning it for 22 hrs. as per the ASTM code procedure. The saturated specimen are then mounted in the Plexiglass cells, the sealant applied and the reservoirs filled with NaCl & NaOH respectively. The cell terminals are then connected to the power supply unit through cable provided –one for each channel and the test started. The passing current magnitude depends on the ions passing through the pores of the concrete specimen (including chloride ions), which in turn depend on the permeability of concrete. 
• In case of LI-RCPT-1 the current is recorded manually from the digital readouts of the power supply unit – every ½ hr. for 6 hrs. The recorded value of the specimen diameter and current are fed into the accompanying spreadsheet software to get the final RCPT value.

 

• The  total charge Q passed in 6 hrs. is calculated as per the formula :
  • Q   =   900 x ( I0 +  2 × I30 +  2 × I60 +  2 × I120   .+  I360)

 

• The value is adjusted for specimen diameters other than 95 mm .This charge in coulombs is an indication of the Cl-Ion penetrability as listed below.
• For LI-RCPT-3 the current and temperature are automatically picked by the Automatic Data Acquisition System (DAQ) every 5 minutes and  these parameters  displayed on the LED panel in real time. After the specified time set by the user (factory setting - 6 hrs.) elapses, the test is shut off. The user may then conveniently transfer the stored data to a PC / laptop and study / process it later.

We are a well-known premium Manufacturer, Exporter & Supplier of Digital Compression Testing Machine based in Delhi, India. We are backed by a deft team of professionals who fabricate the Compression Testing Machine in accordance as per IS: 14858 2000 standard. Our Digital Compression Testing Machine is compact and reliable for testing concrete, cubes, etc., making it useful for site and laboratory applications.

 

Constructions :

• High stability Two / Four pillar load frame.
• Each frame tested for stability and alignment to avoid tension failure during a test and to ensure centre loading.
• A precise large diameter spherical upper platen for optimum results.
• Motorized hydraulic power pack or pumping unit with rapid approach and automatic over load protection.
• Comes standard with safety Guards on all four sides
• The Complete unit comprises a Loading Unit which is of Two / Four pillar model construction having a cross-head with a spherical seated platen. The lower platen is attached to the top of the piston.
• 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.

Features :

• Separate displays for load indication and maximum range.
• Range for load indication corresponding to 4 – 20mA input digitally settable from front panel.
• Peak / Normal mode selectable.
• Up to 9 peaks can be recorded and recalled.
• Buzzer annunciation at Peak.
• Relay output for load limit detection with limit digitally settable.
• Digital tare provided to remove initial error.
• Non-volatile memory for saving configuration.
• Configuration lock at real to prevent tampering with Range.
• Aesthetically designed front panel with membrane switches.

We are one of the eminent Manufacturers, Exporters and Suppliers of Laboratory Concrete Mixers. Our entire range is renowned for features like robust structure, high sensitivity, accuracy, durability and long shelf life. Produced using premium raw materials under the supervision of highly experienced personnel; our Laboratory Concrete Mixers guarantee optimum functionality.

 

Description : The Motorized Concrete Mixer is electrically operated. It is designed to remove the burden of hand mixing. Uniform thoroughly mixed batches can be produced. The counter balanced drum is easy to tilt 1 ½ to 2 cu. ft. mix. The total drum volume is however 3 cu. ft.

Construction : Mounted on a sturdy rubber tyre stand and the drum is mounted for end discharge and equipped with end towing pole. It is equipped with ½ H.P. electric motor. Operation on 220/230 volts 50 Hz. A.C. single phase.