Potentiality of Sewage Sludge Ash as Mineral Additive in Cement Mortar and High Performance Concrete

Title: Potentiality of Sewage Sludge Ash as Mineral Additive in Cement Mortar and High Performance Concrete
Author(s): Fontes
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 797 - 806
Total Pages: 10
Nb references: 16
Language: English

Abstract: In this paper it is evaluated the potentiality of using sewage sludge ash as mineral additive
in cement mortars and high performance concrete. To characterize the sewage sludge
chemical, physical, mineralogical and microbiological analyses were carried out.
Termogravimetric analyses and differential thermal analyses methods were used in order to
determine the optimum burning temperature of the sewage sludge. X-ray fluorescence
spectroscopy method was used to determine the gases emitted to the atmosphere during the
burning process. The sewage sludge ash burned under controlled conditions was characterized
chemically, physically, mineralogically and environmentally through leaching tests.
According to the Brazilian standards the sewage sludge ash was classified as a non-inert
material. Mortars and concretes of normal and high performance containing 5 to 30% of
sewage sludge ash as cement replacement were produced and characterized physically and
mechanically. Sorptivity and water absorption capacity tests were carried out on uniformly
prepared specimens in order to provide information concerning quality control and the
determination of which mixtures are likely to have longer service life. Leaching tests were
carried out in concrete samples to evaluate the immobilization of the pollutants originally
detected in the sewage sludge ash. The results of the study indicate that high strength mortar
and concretes can be obtained using sewage sludge ash as mineral additive and that the
concrete matrix is adequate to immobilize the pollutants originally present in the sewage
sludge ash.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.088