Study on pressure sensitivity of smart polymer concrete based on steel slag

The concrete containing graphite, carbon fiber, steel slag or other conductive materials have a strain-resistance pressure sensitivity. But the resistance of these concrete can not be monotonically changed, which makes it difficult to be used as a sensing material. In order to solve the above problems, this paper has prepared a new type of smart polymer concrete block by adding graphite and steel slag in the epoxy resin concrete to test the pressure-sensitive characteristics under uniaxial compression. The results show that the resistance of the concrete with complex graphite and steel slag increases with the increase of strain under uniaxial compression, and the process shows the concordant monotonicity. In this paper, the concept of "interfacial contact effect" is proposed to explain the phenomenon, that is, the steel slag and sand are similar to the "island" in the form of conductive adhesive matrix "ocean", and the steel slag in the smart polymer concrete provide conductive interface layer. The pressure sensitivity of the block is mainly due to the interfacial contact effect between the interfacial surface and the conductive adhesive matrix. (C) 2019 Elsevier Ltd. All rights reserved.