METHOD AND DEVICES FOR NON-DESTRUCTIVE CONTROL AND PREDICTION OF CONCRETE LOAD CAPABILITY

摘要

A method for measuring a strength of a capillary-porous chemically active material while hardening, the capillary- porous chemically active material including 1640 ב' באב התשס" ג - July 31, 2003 therein water which undergoes stage metamorphosis and including a physically bound water portion having a T2 relaxation time of 30-100 microseconds and a chemically bound water portion having a T2 relaxation time of 10-17 microseconds, the physically bound water portion including water in gel pores and in larger capillaries of the material, the method comprising: performing a high, at least 7 MHz frequency, spin-echo nuclear magnetic resonance measurement of at least said physically bound water portion; and correlating said high frequency, spin- echo nuclear magnetic resonance measurement with a predetermined relationship between said strength and said high frequency, spin-echo nuclear magnetic resonance measurement; wherein, said predetermined relationship is based on: (i) linear relation between a quantity of said physically bound water in the material and an amplitude of said spin-echo nuclear magnetic resonance measurement generated by said physically bound water; and (ii) functional dependency between an energy state of water, as determined by an overall energy of absorption of an RF field, and a relaxation time of water.