METHOD FOR FORECASTING OF CONDITION OF MOTOR ROADS WITH ASPHALT COATS AND ASSIGNMENT OF JUSTIFIED TIMINGS OF REPAIR WORKS Russian patent published in 2010 - IPC E01C21/00 G01M7/00 

FIELD: construction.

SUBSTANCE: thermal properties of asphalt coat are determined, namely, specific heat capacity C_h, free energy increment δF, coefficient of free energy deficit k_def, besides, initial value is value of specific heat capacity of asphalt coat in the beginning of operation, and change of this value is monitored in process of operation, curves of specific heat capacity and increment of free energy dependence on time are periodically built, starting from initial values with account of reference points, at the same time free energy deficit increment is determined, using the following formula: where m - value that is numerically equal to material density, mass dimension, g; T - temperature of coat material (in calculations T=20°C), °C; -initial value of C_h, J/(kg·°C); then free energy deficit coefficient k_def is calculated using the following formula: , where \δF\ - module of free energy increment at this moment of time, δF_max - maximum value of this increment for the period of operation; k_def is considered as criterion that determines timing of repair works completion, and if current value k_def(t) is higher than rated value i.e. conclusion is made on the necessity to perform repair works. Besides rated value of free energy deficit coefficent in the beginning of operation is accepted within the limits of numerical values from 3 to 6, depending on conditions of road surface operation and type of asphalt, and current specific heat capacity C_h is determined at least once a year; at the same time after each other operating stage, when selecting technology of repair works, rated value of free energy deficit coefficient is determined at the moment of another repair completion, which has a trend of decreasing (not increasing) compared to previous value, and limits of specific heat capacity C_h with time take values from 975 to 1578 J/(kg·°C), depending on conditions of road surface operation and type of asphalt.

EFFECT: increased efficiency of forecasting condition of motor roads with asphalt coats and assignment of justified timings of repair works.

5 cl, 2 dwg