Determination of the secant compression ELASTIC MODULUS on concrete. System: Automatic with pace rate control also when releasing the load. It can be used with a MATEST high stability frame 2000 or 3000 or 5000 kN capacity, coupled to the automatic servo-controlled system “Servo-Plus Evolution” (mod. C104N) housed in a separate pyramidal frame.
The appliance includes:
Hydraulic System
It is an hydraulic installation and has a high performance valve directly controlled by the digital unit that grants the automatic control of the pace rate increasing the load, keeps a certain load and than controls the pace rate decreasing the load.
The setting of the pace rate is made by a very sensitive valve controlled by a stepper motor thus allowing a micrometric action on the pace rate granting results.
A laser position detector allows a rapid positioning of the piston. This grants a touching sensitivity of test starting at about 0.1 per thousand of the big capacity.
Electronic Measuring System
The high performance control and data processing unit controlled by a 32 bit microprocessor, can manage up to 8 high resolution channels for the control of load cells or transducers with strain gages bridge. The unit contains two Analogical/Digital last generation converters with 24 bits resolution. The system processes the signals coming from the load cells and from the extensometers giving all the results required for further processing following the updated International Standards for this application.
Data Acquisition And Processing Utm2 Software
The software has been developed on the working line of the already known software UTM-2 (Windows menu). It contains the profiles of the main Standards used, but the user can modify as he likes and personalize the test profile that will be carried out in a completely automatic way by the testing machine.
The software allows to determine both the initial and stabilized secant modulus of elasticity as requested by EN 12390-13 Standard.
The software gives the possibility to print on a standard printer a test certificate reporting all the data concerning the test and the specimen and the graph of the test. The software includes the license “Servonet” mod. C123N, while the extensometers (two models are proposed: A and B) are not included in the standard supply and ordered separately (see accessories).
The appliance allows verifying the proper reading of the extensometers and, if everything is within the expected tolerances, it manages the average deformation value read by the transducers and processed by the digital unit, than it transmits by means of the communication port RJ (Network Connection) to a Personal Computer, that can be already by the end user or supplied separately all the data of the test. These data will be processed by the software and transformed in a graph load/deformation and load/time, following the International Standards.
C125-15 KIT for the application of single use extensometers composed by:glue, welder, solder, cleaning liquid, accessories, the whole in carrying case.
C125-09INTERFACE MODULE, a needed accessory to connect to 4 electric single use extensometers. This module allows also the automatic calibration of the zero and of the measuring range after a special thermal compensation. This grants a five times better accuracy than the one requested by the Standards.
C134 electronic universal extensometer
Made of two anodized aluminum sheets, one fixed and the other sliding, and accommodating a displacement sensor, the sensor accurately measures the motion of two conical points made of hardened steel and is connected to both ends of the electronic sensor. Aluminum template (optional model C134-10) is used to adjust and calibrate the length of the base. Two conical points are connected to the surface of the sample through two adjustable elastic bands through a fast and simple connection system. The instrument is equipped with a mechanical knob to lock and unlock the displacement sensor, thereby protecting the selected base length when connecting the device to the sample. Usually, three extensometers/compression gauges are used for testing on cylinders, and two or four instruments are used for testing on cubes or beams.
The extensometer is suitable for testing cubic, cylindrical, and beam specimens with a height of 130 mm. It is also possible to test mortar prisms of 40x40x160 mm by using shortened test blocks. The gauge length can be adjusted between 50 and 160mm, with a stroke of ± 1.5mm and a sensitivity of less than 0.01 micrometers. It provides a complete Mortarpism pressure reducing block, elastic band, and suitcase. The weight is about 1000 grams
