Test instrument for shrinking and deforming of road surface material

A measurer of road surface material shrinkage deformation consists of environmental box with insulation layer on support; compressor, A / D converter, industrial control computer and printer set on shock absorber; condensing tube in sandwich layer of environmental box; temperature transducer, heating tube and fan in environmental box; test piece support on weighing transducer; displacement support opposite to test piece support; sleeve and conductive rod on displacement transducer and backing plate on top surface of test piece.