- Determination of resistance and deformation under load
- Evaluation of tensile stress
- Measurement of elastic modulus and breaking load
The complete test is developed in two steps:
-Determination of Static Load (Tensile Status)
One flat jack is used.
Two datum points are fixed across a mortar joint and the distance between the points is measured.
Successively a horizontal cut is carried out with the suitable tool (drill, cutting saw) level with the mortar layer, and it is measured the variation of the two datum points.
The flat jack must be introduced, it is pressurized in different growing phases and the variation between the datum points is measured, by determining the static load.
-Determination of Deformation and Resistance (In-Situ Stress)
Two flat jacks are used.
It must be done a second cut, parallel to the first one, level with the mortar layer, having a distance of approximately 50 cm from the first cut.
Another flat jack must be introduced.
Three couples of datum points are placed on the brickwork portion between the two cuts.
Start to pressurize the two flat jacks at growing phases.
The variation of distances of the datum points at different pressure steps allows to delineate a strength-deformation curve, obtaining elastic modulus, Poisson and breaking point values.
C358-01
Rectangular Flat Jack high deformability, max. pressure 50 bar, dimensions 400x200x4 mm. Steel sheet 0.8 mm thick Complete with nuts and groins.
C358-11
N° 6 Steel Sheets, dimensions 400x200 mm, three pieces 1 mm thick, three pieces 1.5 mm thick.
C358-02
Semi-Oval Flat Jack ad high deformability, max. pressure 50 bar, dimensions 350x260x4 mm. Steel sheet 0.8 mm thick. Complete with nuts and groins.
C358-12
N° 6 Steel Sheets, dimensions 350x260 mm, three pieces 1 mm thick, three pieces 1.5 mm thick.
C358-05
Stopcock (valve) high pressure complete with fittings, to close the oil flow in the jack and stop the pressure.
Load Application
C358-06 Hydraulic Hand Pump, complete with integral reservoir with oil, to apply pressure to the jacks.
C358-15 Flexible rubber tube, 3 meters length, for the connection to one jack.
or
C358-16 Flexible rubber double tube, 2 and 3 meters length, for the connection to two jacks.
C358-08 Manometer high precision 0 - 60 bar range, with fast jack, to be fixed on the pump to read the applied pressure.
Strain Measurement
C361-KIT Strain Gauge-Extensometer with mechanical strain gauge, 300 mm length
veya
C363 KIT Strain Gauge-Extensometer with digital strain gauge, 300 mm length.
As alternative to the strain gauge, the data acquisition and processing system can be used, with the following equipment:
C358-21 Electronic Extensometer
supplied with linear displacement transducer having 10 mm stroke and 0.1% linearity, fitted in a tubular anodized aluminum frame, complete with electrical cable and connector.
Span: 300 mm
Weight: 300 g approx.
C358-23N Pressure Transducer
50 bar capacity, to be fitted to the hand pump (as alternative to the manometer).
Complete with fast jack to the pump, electrical cable and connector.
C405-15N Cyber Plus 8 Evolution Touch Screen
8 Channels acquisition and processing data system, 24 bit resolution.
Electronic advanced technology, colour touch screen 1/4VGA, high graphic performances, the unit automatically performs test and data processing.
A certificate can be printed through a printer (optional) directly connected to the unit through the USB port.
The Cyber-Plus is equipped with slots for external pendrive or SD card infinite memory supports, it can be directly connected to a PC.
Contained in a practical and sturdy watertight carrying case, can be powered from an electrical network 90-270 V or use the internal battery and charger granting one full day on-site use.