Mix composition determination method of coarse graded high modulus asphalt concrete with skeleton embedded structure

A mix composition determination method for coarse graded high modulus asphalt concrete with a skeleton embedded structure, the method comprising:

• first, determining a design grading curve of the coarse graded high modulus asphalt concrete with a skeleton embedded structure, based on calculating a passing rate value of each key mesh of an aggregate;
• second, determining an optimal oil-stone ratio of asphalt concrete, such that the asphalt concrete provides a good performance, wherein the method further comprising:
• choosing a low labeled hard asphalt with a penetration degree of no higher than 30 as a cementing material;
• choosing a coarse aggregate, a fine aggregate and a mineral powder, wherein a maximum nominal size of the coarse aggregate is no smaller than 26.5 mm;
• choosing the maximum nominal size of the coarse aggregates and corresponding key meshes;
• determining the maximum nominal size of the coarse graded asphalt, an aggregate passing rate of three key meshes;
• using passing rate of the maximum nominal size and a mesh size di to construct a first formula, and using passing rate of 4.75 mm and its mesh size to construct a second formula, and using the first formula and the second formula to calculate a coefficient A and a coefficient B from Pdi=A(di)B;
• calculating the coefficient A and the coefficient B from Pdi=A(di)B using an aggregate passing rate, Pdi, of meshes having diameters, di, including the maximum nominal size and 4.75 mm;
• using passing rate of the maximum nominal size and a mesh size di to construct a first formula, and using passing rate of 0.075 mm and its mesh size to construct a second formula, and using the first formula and the second formula to calculate a coefficient C and a coefficient D from Pdj.=C(dj)D;
• calculating the coefficient C and the coefficient D from Pdj.=C(dj)D using an aggregate passing rate, Pdj, of meshes having diameters, dj, including diameters of 4.75 mm and 0.075 mm;
• choosing 5-6 oil-stone ratios that interval is 0.3%-0.4% according to the design grading curve;
• forming 4-6 specimens under each oil-stone ratio;
• determining a gross volume density and a theoretical maximum density of the specimens;
• calculating a dry density of the mix, voids in mineral aggregate (VMA) and voids in coarse aggregate (VCA);
• drawing a quadratic curve between the dry density of the mix, the VMA, the VCA and the oil-stone ratio;
• selecting an average of a first oil-stone ratio (OAC1) that corresponds to the minimum value of the VMA, a second oil-stone ratio (OAC2) that corresponds to the minimum value of the VCA and a third oil-stone ratio (OAC3) that corresponds to the maximum value of dry density of the mix;
• determining an optimum oil-stone ratio OAC of coarse graded high modulus asphalt concrete with skeleton embedded structure from the following:
• OAC=(OAC1+OAC2+OAC3)/3;
• and
• preparing coarse graded high modulus asphalt concrete having the optimum oil-stone ratio OAC.