Durability and Ecological Evaluation of Structural Concrete with Sewage Sludge Ash as Ternary Binder

Document Type

Article

Publication Title

Civil Engineering and Architecture

Abstract

SSA is a residue after incineration of sewage sludge, obtained from wastewater treatment plants. The efficacy of cementitious ternary blends, containing sewage sludge ash as a cementitious binder along with large volumes of flyash is studied experimentally and reported in this paper. Proportion of Portland cement in all the binder composition is limited to 50%. The properties of ternary blends containing Portland cement-flyash-Sewage sludge ash, such as fluidity, mechanical strength and durability are investigated. Present study reports the properties of M50 concrete, which is the most common concrete grade for various infrastructure projects. The binder mix consists of a blend of Portland cement, flyash and SSA. For all the mixes, the SSA proportion varied between 5% to 15% of the total binder content. Carbon emissions and ecological assessments have shown that effective use of SSA reduces environmental impact and improves sustainability. However, the proportion of SSA is to be restricted to 10% of the total binder content in order to achieve strength levels of 50 MPa or above. Binder composition of Portland cement flyash and sewage sludge ash induced sufficient workability for pumpable concrete and exhibited good mechanical strength. It has also contributed to considerable improvement in ecological parameters.

First Page

1143

Last Page

1164

DOI

10.13189/cea.2024.120234

Publication Date

1-1-2024

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