Influence of temperature on the rheological behaviour of eco-mortar with binary and ternary cementitious blends of natural pozzolana and marble powder

Abstract

With the advent of new concrete such as low-impact environmental concrete, and the new implementation techniques of cementitious materials such as 3D printing and pumping, it becomes crucial to control the rheological behaviour of these materials taking into account the different climatic conditions. The main objective of this study is to investigate the influence of mineral additions and temperature on the rheological parameters (yield stress, plastic viscosity) and the fresh properties (slump, flow time) of low-impact environmental concrete using concrete-equivalent mortar (CEM) concept. For this purpose, fifteen mixtures of CEM were prepared by substituting the cement with natural pozzolana (PZ) and marble powder (MP) in binary and ternary blend systems. The rheological and fresh properties of CEM mixtures were investigated at different temperatures ranging from 10 °C to 50 °C. The results obtained revealed that, the use of binary and ternary blended cements based on PZ and MP increased the fresh properties and decreased the rheological parameters of CEM tested in a standard environment of temperature 20 °C. In addition, the increase in temperature affected negatively the fresh properties and rheological parameters of all binary mixtures. However, at low temperature (10 °C), the viscosity and yield stress of ternary mixtures have been enhanced.