Properties of cementitious materials with sewage sludge ashes

Author(s): M. Saillio (1), L. Andrade (1) M. Mehdi (1)(2) T. Chaussadent (1) and Arezki Tagnit-Hamou
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 180-187
Total Pages: 8
Language : English

Abstract: Numerous industrial by-products have potential for use as alternative supplementary cementitious materials (ASCMs) in concrete. The objective of the present study is to better understand the reactivity and the impact on durability and on hydration of one ASCMs: calcined sewage sludge ashes (SSA).
Some tests are directly performed on SSA such as the Pozzolanic test. In addition, cementpastes and mortars with SSA are mixed with the same W/B ratio. Seven binders are studied: a reference OPC and 6 mixes with OPC substituted by SSA from 5 to 30%. In order to study the hydration, setting time test, XRD, TGA/DTA are performed on cement paste and the durability tests are also performed on mortars such as water porosity, rapid chloride test and resistivity test. Various water curing time (from 7 to 365 days) are chosen in order to take into account the evolution of the materials.
The first results, based on chemical tests have highlighted the behaviour of this ASCMs and led to the design of materials which exhibit good durability properties at long age. In particular, chloride diffusion apparent coefficient is significantly reduced for material with SSA. Some properties (such as a potential pozzolanic activity) appear to be quite similar to standard fly ash or metakaolin.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00