Method for detecting compaction and shear strength characteristics of asphalt mixture during construction compaction

A method for detecting compaction and shear strength characteristics of an asphalt mixture during construction compaction, comprising the following steps:

• step 1:
• the asphalt mixture is paved on site;
• after the asphalt mixture is compacted by a compactor, a detection device is moved to a selected detection point;
• step 2:
• a claw-shaped blade on an output end of a test claw is pressed into the asphalt mixture with a certain degree of compaction through a lift switch;
• step 3:
• a power switch of an electric motor is turned on;
• the electric motor drives the test claw to rotate slowly and uniformly;
• a temperature T (° C.) and a torque M (N·m) on a display are recorded;
• step 4:
• the torque M obtained in step 3 is used to calculate a shear strength and a shear stiffness of the asphalt mixture:
• F
• =
• G
• ⁢
• ⁢
• γ
• =
• M
• ⁢
• ⁢
• ρ
• I
• p
• ⁢
• ⁢
• G
• =
• F
• γ
• =
• M
• ⁢
• ⁢
• ρ
• γ
• ⁢
• ⁢
• I
• p
• wherein, F is the shear strength, G is the shear stiffness, γ is a shear strain, ρ is a radius, and Ip is a polar moment of inertia;
• and
• step 5:
• the shear strength and the shear stiffness obtained in step 4 are used to calculate a compaction detection index K/Kmin of the asphalt mixture, wherein K is defined as an inverse of the shear stiffness,
• K
• =
• 1
• G
• ,
• and Kmin is a minimum value of K of the asphalt mixture under a corresponding degree of compaction.