Influence of fiber grid on interlayer bond property of airport double-layer pavement

Abstract

In order to study the interlayer bond property of airport double-layer pavement, the cement concrete cube splitting tensile test and double-layer beam test were conducted. The bond mechanism of fiber grid and airport double-layer pavement was analyzed. The deflection and strain of upper and lower beams of double-layer beam were measured. The splitting tensile strength of new and old cement concrete cubes, the strain ratio, deflection difference and coupling coefficient of the double-layer beam were taken as criteria for the interlayer bond property of airport double-layer pavement. The result demonstrates that the splitting tensile strength is maximal when the basalt fiber grid with dimension of 5 mm was adopted, the old cement concrete and fiber grid surface treatment have great influence on splitting tensile strength, but the maximum grain size of coarse aggregate have few influence on it. The friction between double-layer beam reduces the strains of the bottom of the lower and upper beams by 44.44–98.46%. The fiber grid and old cement concrete surface treatment not only increase the coupling coefficient with the range of 4.60–15.73% but also decrease the deflection difference, the number of which ranges from 0.004 mm to 0.016 mm, thus improve the integral force performance and deformation ability of double-layer beams.