GEAR DETERMINING WATER-PROOFNESS OF CONCRETE Russian patent published in 2000 - IPC

FIELD: construction material industry. SUBSTANCE: gear determining water-proofness of concrete is made of pipe-line with taps in which pump, electric contact manometer coupled electrically to pump with the aid of magnetic starter, valve, samples of tested materials with sealing gaskets, electric time counting system that is electrically coupled to surfaces of tested samples via measurement electrodes are arranged. Samples have form of cylindrical sleeves into which metal bushing is pressed, its internal surface has thread used to install samples in ends of taps of pipe-line. Contacts of measurement electrodes which are electrically connected to input of electron system are anchored on surfaces of samples by means of pressing fixtures. To measure water-proofness of samples there is used conductometric method which consists in registration by measurement devices of various abrupt changes of resistance of sections of samples between contacts of electrodes with emergence of moisture in the form of wet spot on outer surfaces of samples which leads to change of voltage supplied from D C source to input of electron system. Reading of time on timer panel stops and sound signal indicating termination of testing process is actuated simultaneously. EFFECT: increased accuracy of determination of moment of appearance of wet spot on outer side of tested sample, simplified design of structure for attachment of samples to taps of pipe-line, reduced time of test. 2 dwg