Influences of type and concentration of recycled mineral construction, renovation and demolition waste on the linear viscoelastic behavior of bituminous mastics

Abstract

The objective of this research is to study the impact of the use of construction, renovation and demolition (CRD) fillers on the linear viscoelastic behavior (LVE) of bituminous mastics. Forty-two (42) mastics, composed of a PG 64H-28 bitumen and 4 different contents of various types of filler, were created: concrete (Co), hydrated lime (HL), glass (Gl), porcelain (Po), ceramic (Ce), brick (Br), gypsum (Gy), clay (Cl), limestone (Li), an artificial mix realised in the laboratory (AM) and two samples of CRD waste called natural mix 1 and 2 (NM1 and NM2). The limits of the LVE domain were determined for each mastic and their LVE behaviors were studied on a wide range of frequencies and temperatures using a dynamic shear rheometer (DSR). The LVE behavior was modelled using an automatized calibration process of the 2S2P1D model. The quality of the calibration was also evaluated. Results reveal the overwhelming importance of a parameter called effective volume of filler (Vfe) which is related to the Rigden Voids value of the filler and its content in the mastic. This sole parameter can predict with great precision the stiffening power of a CRD filler, and also predict partially several constants of the resulting mastic LVE model.