Standard: ASTM C1550
Base Support Frame, holding the concrete slabs having 800 mm diameter by 75 mm thick, complete with upper loading element.
Weight: 60 kg approx.
Needed Accessory
S336-14 Displacement Transducer, to measure the central deformation of the slab under concentrated load.
Travel: 50 mm
Full bridge at 350 Ohm
Independent linearity: < 0.1%
Standard sensitivity: 2 mV/V
C109-15N Firmware/Software for: Measurement of deflection on fibre reinforced concrete beams Determination of toughness, first crack strength and ductility Energy absorption test on sprayed specimens.
Standards: EN 14488-5, ASTM C1550
Test Procedure
- Mount the test specimen in the test apparatus by placing the molded face onto the three transfer plates resting on the pivots. Center the panel with respect to both the supports and loading piston.
- Measure the diameter of the panel to the nearest 2 mm at three places coincident with the intended support locations and calculate the average diameter. If the average diameter of the specimen is less than 790 mm or greater than 810 mm, discard the specimen.
- Operate the testing machine so that the piston advances at a constant rate of 4.0 6 1.0 mm/min up to a central displacement of at least 45.0 mm.
- Count the number of radial cracks occurring between the center and the perimeter. Any flexural crack occurring on the tensile face of the panel is counted as a full crack provided its average width exceeds 0.5 mm upon completion of the test and removal of the load.
- Remove the failed specimen fragments from the test apparatus, and measure the thickness at three points along each of the cracked surfaces and at the center so that the resulting 10 values provide a representative estimate of the average thickness of the specimen. Measure the thickness to the nearest 1 mm and calculate the average thickness to the nearest 1 mm. If the average thickness is less than 70 mm or greater than 90 mm, discard the specimen. Calculate the standard deviation in thickness. If the standard deviation in thickness exceeds 3.0 mm, discard the specimen.