METHOD FOR DETERMINING STRENGTH OF LAYER OF ROAD PAVEMENT OF NON-STIFF TYPE ON AUTOMOBILE ROADS Russian patent published in 2015 - IPC E01C23/07 

FIELD: construction.

SUBSTANCE: method for determining strength of a layer of road pavement of a non-stiff type on automobile roads provides for measurement of thickness of a layer of road pavement at two different points, determination of total elasticity moduli at these points, for examples by means of a deflection meter. Then, considering a known diameter of an equivalent circle of trace of a car wheel, strength of material of the road pavement layer is determined by the following formula: $$E_{"в"}=\frac{3,3D(E_{tot}^{\text{'}}-E_{tot}^{"})}{\frac{h_1^2}{0,1D+h_1}-\frac{h_2^2}{0,1D+h_2}},$$ where: E_"в" - elasticity modulus of road pavement material, MPa; D - diameter of equivalent circle of a car wheel, m; $$E_{tot}^{\text{'}}$$ - total elasticity modulus at one point of road pavement, MPa; $$E_{tot}^{\text{'}\text{'}}$$ - total elasticity modulus at another point of road pavement, MPa; h₁ - thickness of layer of road pavement at measurement point $$E_{tot}^{\text{'}},$$ m; h₂ - thickness of layer of road pavement at measurement point $$E_{tot}^{\text{'}\text{'}},$$ m.

EFFECT: obtained strength results of a layer of road pavement allow solving issues of assessment of strength of road pavement, taking decisions on quality handling and repair, as well as possibilities of reconstruction of road pavement.

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