METHOD FOR DETECTION OF CONCRETE CRACK RESISTANCE Russian patent published in 2010 - IPC G01N33/38 

FIELD: construction.

SUBSTANCE: method for detection of concrete crack resistance includes loading concrete samples with compression and stretching forces, definition and comparison of parametres that specify their physical properties - υ, E, µ, R_c, L_r, measured after drying until mass stabilisation and water-saturated condition, besides, process of drying - mass stabilisation occurs with moisture of 40% and temperature of 18-20°C, and process of water saturation at atmospheric pressure until mass stabilisation, and assessment of crack resistance by coefficient of crack resistance K_cr with the help of method of integration of all cracks available in concrete sample into one - reduced - crack, length value of which is calculated according to formula Lr=2Eυ/(πµ²R_c ²), where υ- surface energy of concrete, J/m², E - module of concrete elasticity, MPa, µ - Poisson coefficient, R_c - concrete compression strength, MPa, and crack resistance coefficient is calculated according to formula where - length of reduced crack in dry substances, m, - length of reduced crack in water saturated samples, m.

EFFECT: increased accuracy and reliability of concrete crack resistance detection.

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