Corrosion and mechanical performance of reinforced mortar and concrete made with MSWI bottom ash

Abstract

Electrochemical monitoring was performed to evaluate the influence of municipal solid waste incineration residues (MSWI) made concrete, on reinforcement corrosion, using four different steel reinforcements grades, traditional carbon steel B-500-SD and three stainless steels, the austenite AISI 304, duplex AISI 2304, and lean-duplex AISI 2001, embedded in mortars manufactured using bottom ash as aggregates from the incineration of municipal solid waste (MSW), in partial and total substitution of natural aggregate. In addition, it has been studied the mechanical behaviour of the mortar and concrete matrix in the presence of MSWI aggregates. The use of MSWI bottom ash as an aggregate, results in a notable improvement of the resistance characteristics of conventional mortar and concrete, made out only of natural aggregate. Moreover, electrochemical measures show that the steels remain in passive state throughout all the exposure period (3 years). Copyright: © 2017 CSIC.