Ternary Mixes of Self-Compacting Concrete with Fly Ash and Municipal Solid Waste Incinerator Bottom Ash

B Simões,Y Avila,R V Silva,P R Da Silva,J A Forero

doi:10.3390/app11010107

Abstract

This study aims to evaluate the potential of incorporating fly ash (FA) and municipal solid waste incinerator bottom ash (MIBA) as a partial substitute of cement in the production of self-compacting concrete mixes through an experimental campaign in which four replacement levels (i.e., 10% FA + 20% MIBA, 20% FA + 10% MIBA, 20% FA + 40% MIBA and 40% FA + 20% MIBA, apart from the reference concrete) were considered. Compressive and tensile strengths, Young’s modulus, ultra-sonic pulse velocity, shrinkage, water absorption by immersion, chloride diffusion coefficient and electrical resistivity were evaluated for all concrete mixes. The results showed a considerable decline in both mechanical and durability-related performances of self-compacting concrete with 60% of substitution by MIBA mainly due to the aluminium corrosion chemical reaction. However, workability properties were not significantly affected, exhibiting values similar to those of the control mix.

Highlights

Solid Waste Incinerator Bottom Ash.The global production of cement in 2018 exceeded 4000 million metric tonnes and is responsible for a considerable portion of the world’s CO2 emissions, i.e., 0.8 tonnes of CO2 per tonne of cement [1]
Along with the need to reduce the exploitation of the raw materials for clinker production, there have been several studies on the development of supplementary cementitious materials (SCM) [2,3,4,5], which are typically by-products that re-enter the supply chain instead of landfill disposal preventing environmental issues such as the contamination of soil and groundwater
Examples of waste used as cement replacement in self-compacting concrete are: Rice ash [6]; sugarcane bagasse ash [7]; blast furnace slag [8]; and bottom ash from municipal solid waste (MSW) incineration [9,10]

Summary

Introduction

Solid Waste Incinerator Bottom Ash.The global production of cement in 2018 exceeded 4000 million metric tonnes and is responsible for a considerable portion of the world’s CO2 emissions, i.e., 0.8 tonnes of CO2 per tonne of cement [1]. Given the considerable amount of cement used to produce conventional concrete and the even greater amount for self-compacting concrete (SCC), necessary to reach its highly flowable state, there is considerable scope to reduce its content. With this in mind, along with the need to reduce the exploitation of the raw materials for clinker production, there have been several studies on the development of supplementary cementitious materials (SCM) [2,3,4,5], which are typically by-products that re-enter the supply chain instead of landfill disposal preventing environmental issues such as the contamination of soil and groundwater. Examples of waste used as cement replacement in self-compacting concrete are: Rice ash [6]; sugarcane bagasse ash [7]; blast furnace slag [8]; and bottom ash from municipal solid waste (MSW) incineration [9,10]

Objectives

Methods

Conclusion