Electrochemical Noise Study of the Passivation of AISI 1018 Carbon Steel as Reinforcements Embedded in Ternary Concretes During the Setting Process

Abstract

In the present work, contribution of supplementary cementitious materials (SCM) such as sugarcane bagasse ash (SCBA) and fly ash (FA) in the reduction of the corrosion phenomenon in AISI 1018 carbon steel as reinforcement during 24 hours of concrete setting was studied. The design of ternary concrete systems was carried out according to ACI 211.1 method. Ash percentages were 10 and 30% of SCBA and FA combined. During the electrochemical study, corrosion potential (Ecorr ) and electrochemical noise (EN) of AISI 1018 carbon steel was monitored. Time series of current and potential, as well as the corrosion current density (icorr), noise resistance (Rn), localization index (LI) and corrosion rate (Vcorr) were analyzed. Results show that concretes added with SCBA and FA presented a better anticorrosion behavior, especially ternary concrete system added with 10% of combined ash, corrosion rate decreased 55% against the reference concrete.

Study on the setting characteristics of filling slurry with different aggregate combinations

“…It plays a crucial role in the strength of concrete, the arrangement of construction progress, and the quality of construction (Hu et al, 2017;Li et al, 2007). The consolidation and hardening properties of concrete-like materials are also a reflection of their strength changes, and usually, if the consolidation and hardening process of concrete-like material slurry is normal, its strength will also develop normally with certain rules to meet the engineering application requirements (Recio-Hernández et al, 2023;Yuan et al, 2023;Gupta et al, 2022;Paul et al, 2022). In the case of mine goaf backfill, the filling materials are affected by the process technology and market price, and thus also impose special performance requirements on the filling materials.…”