Reduction of the environmental impacts of reinforced concrete columns by increasing the compressive strength: a life cycle approach

Abstract

The building industry is one of the greatest environmental impact causers in the planet. Cement is the second most used material in the world and the consumption of concrete ranges between 20 to 30 Gt yearly. This demand for the materials ten ds to increase for the next 100 years. The increase of concrete strength to reduce the material consumption is one of the options proposed in literature to reduce the environmental impacts in building industry. However, few studies have been carried about the actual advantages of this strategy in building production. In this paper, a 15-storey reinforced concrete building was designed with three different concrete grades for its columns: 30 MPa, 40 MPa and 50 MPa. The results for the volume of concrete and the amount of reinforcing steel to produce the columns were used to perform a cradle-to-gate life cycle assessment (LCA) to determine the alternative with less environmental impacts in the production stage. Results indicate an advantage to adopt higher strength concretes in columns to reduce environmental impacts and the consumption of materials. Direct effects of higher strength in concretes made possible to reduce the consumption of concrete by 15%. There was also a significant reduction caused by indirect effects of higher strengths in concrete, with the reducing of steel consumption up to 22%. With the combination of the direct and indirect effects of higher compressive strengths, it was possible to reduce the environmental impacts of reinforced concrete in all categories studied in the LCA.

Enhancement of Cement’s Compressive Strength of Concrete using Mid-Infrared Ray – A Fundamental Research

“…Such desirable results in coffee, tea, cocoa and edible salts were achieved using MIRGA spraying by Umakanthan et Since long, alternative to cement research is ongoing with merits and demerits of the results. CSC improving technologies are use of nanocements (Brown et al, 2019), use of higher strength concrete (40 MPa or 50 MPa) (Jemimah et al, 2021), use of metals waste (Bacelar et al, 2022) and mine drainage sediments, calcium sulfo-aluminate/alkaline hydroxide substances/ aluminosilicate minerals/sodium potassium silicate minerals (Hong et al, 2016). CSC was also increased by various researchers by irradiation with ultraviolet (Bo et al, 2011), microwave (Dmitriev et al, 2017), gamma rays (Osamu et al, 2013), neutron and radiation on sulphur polymer concrete (Piotr et al, 2020), but these are having limitations with application and costeffectiveness.…”