Elsevier

Cement and Concrete Research

Volume 26, Issue 9, September 1996, Pages 1389-1398
Cement and Concrete Research

Refereed paper
Use of sewage sludge ash(SSA)-cement admixtures in mortars

https://doi.org/10.1016/0008-8846(96)00119-6Get rights and content

Abstract

The chemical composition of sewage sludge ash (SSA) and their sized fractions are studied, some differences in chemical composition are observed. SEM studies show irregular shape of SSA particles and sized fractions, this shape has a decisive influence on workability of mortars. The effect of replacing 15% of portland cement by SSA and their sized fractions: coarse (SSAC) and medium (SSAM) obtained by sieving on compressive (Rc) and flexural (Rf) strength of mortars was investigated. The study reveals an enhancement of strength when ashes are used, due to probably, pozzolanic properties of SSA.

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    Citation Excerpt :

    The replacement values of 10 to 20% gave a reduction in strength when compared to control samples. This can be attributed to the fact that SSA has a moderate pozzolanic activity and the dilution effect of cement [39,40]. The flexural strength of 10% addition of SSA had an increase in the strength of the order 8.05% when compared to 20% SSA for 7 days, similarly, there was a 4.45% the increase in the strength for 10% of SSA incorporated mortar when compared to 20% SSA.

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