Modelling and optimisation of concrete containing recycled concrete aggregate and waste glass

Abstract

Recycling of waste materials plays a significant role in waste management strategies, but the interactive properties of recycled aggregates in concrete have been considered by only a few researchers. The experimental study reported in this paper focused on the effects of recycled concrete aggregate (RCA) and waste glass (WG) on the properties of concrete. The response surface methodology was used to optimise and model the results of tests for compressive strength, tensile strength, slump, water absorption, electrical resistivity and hardened unit weight. The effective variables of the experiment were RCA (0–65%) as coarse aggregate replacement and WG (0–40%) as fine aggregate replacement. The results obtained indicate that high volumes of waste materials could be used in concrete without a significant reduction in the mechanical and durability (namely water absorption and electrical resistivity) properties of the concrete. Moreover, when WG was substituted in the mixture, the water absorption, electrical resistivity and workability of the concrete improved and the use of RCA had a significant influence on the mechanical properties of the concrete. Based on statistical analysis, all the proposed models were adequate, with coefficients of determination above 0·95. The optimum condition in which all response targets performed properly was found to be 17% of RCA and 35% of WG.

Effect of Hybrid Steel‐Basalt Fiber on Behaviors of Manufactured Sand RPC and Fiber Content Optimization Using Center Composite Design

“…e RSM is a combination of statistical and mathematical techniques, which is widely used in various fields for modeling and analysis. Compared with other experimental methods, the advantage of the RSM is that the relationship between response and various factors can be found through a small number of experiments [23]. In this study, the CCD in the RSM was adopted.…”

A study of the physical properties and chemical reagents of epoxy mortar floor intermediate coating using recycled glass sand as filler

“…Biglarijoo et al. 12 focused on the effects of recycled concrete aggregate and waste glass on the properties of concrete. Their objectives were to optimize and model the results of the tests for compressive strength, tensile strength, slump, water absorption, electrical resistivity, and hardened unit weight.…”

“…The results obtained show that when using both green and amber glass cullet, the mortars are stable; moreover, when using powder glass, a significant pozzolanic effect is also obtained. Biglarijoo et al 12 focused on the effects of recycled concrete aggregate and waste glass on the properties of concrete. Their objectives were to optimize and model the results of the tests for compressive strength, tensile strength, slump, water absorption, electrical resistivity, and hardened unit weight.…”

Transfer properties in recycled aggregates concrete: Experimental and numerical approaches

“…Concrete made with recycled concrete aggregates has often been investigated from a mechanical point of view [19,20,21,22] rather than for its durability aspects [23,24,25,26]. To reach that goal, a better understanding of the material behaviour is required: an extensive experimental programme is conducted.…”