Abstract

The sewage treatment plants generate, as by-products, large amounts of sludge containing harmful elements to the environment. This paper investigates the possibility of using 10% of sewage sludge by weight in pavement base layers. The soil stabilization technique was used to improve the residue properties to satisfy the minimum requirements for road bases. The intent of this stabilization technique was to use conventional additives as cement, lime, and emulsion. The main objective was to evaluate the strength behavior of the modified soil. Sludge-soil mixtures with different additive contents (2, 4, 6, and 8%) were prepared for testing. The modified soil samples were subjected to compaction, and then tested for the following parameters: California bearing ratio, unconfined compressive strength, indirect-tensile strength, resilient moduluså, and deterioration tests. Mechanical tests were used to estimate the optimum mix design. Test results indicated that the stabilization of mixtures of soil with sewage sludge has the potential to be used in the pavement industry.

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Acknowledgments

The authors thank the Federal University of Pernambuco (UFPE), Federal University of Ceará (UFC), Federal University of Campina Grande (UFCG), and Associação Técnica Científica Ernesto Luís de Oliveira Júnior (ATECEL) for supporting the necessary tests for this study.

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Go to Journal of Materials in Civil Engineering
Journal of Materials in Civil Engineering
Volume 26Issue 9September 2014

History

Received: Apr 30, 2013
Accepted: Sep 5, 2013
Published online: Sep 7, 2013
Published in print: Sep 1, 2014
Discussion open until: Oct 12, 2014

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Authors

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Lêda Christiane de Figueirêdo Lopes Lucena [email protected]
Professor, Dept. of Civil Engineering, Universidade Federal de Campina Grande Brazil, Elpidio de Almeida, 2081, apt 603-B, Catolé–Campina Grande, Paraíba 58410-215, Brazil (corresponding author). E-mail: [email protected]
José Fernando Thomé Juca [email protected]
Professor, Dept. of Civil Engineering, Universidade Federal de Pernambuco 50670-901, Brazil. E-mail: [email protected]
Jorge Barbosa Soares [email protected]
Professor, Dept. of Civil Engineering, Universidade Federal do Ceará 60020-181, Brazil. E-mail: [email protected]
Manoel Gualberto Portela [email protected]
Student, Dept. of Civil Engineering, Universidade Federal de Campina Grande 58410-215, Brazil. E-mail: [email protected]

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