Materiales de Construcción, Vol 56, No 282 (2006)

Effect of sewage sludge ash (SSA) on the mechanical performance and corrosion levels of reinforced Portland cement mortars

E. G.ª Alcocel
Dpto. Construcciones Arquitectónicas. Universidad de Alicante, Alicante, Spain

P. Garcés
Dpto. Ing. de la Construcción, Obras Públicas e Infr. Urb. Univ. Alicante, Spain

J. J. Martínez
Dpto. Ing. de la Construcción, Obras Públicas e Infr. Urb. Univ. Alicante, Spain

J. Payá
GIQUIMA. Dpto. Ing. de la Construcción y Proyectos de Ingeniería Civil. UPV, Valencia, Spain

L. G.ª Andión
Dpto. Ing. de la Construcción, Obras Públicas e Infr. Urb. Univ. Alicante, Spain


The article describes a study conducted to determinecorrosion in reinforcement embedded in Portland cement(PC) mortars with different percentages of sewage sludgeash (SSA) admixtures. The polarization resistancetechnique was used to determine the steel corrosion rate(Icorr) in the test specimens. The samples were subjectedto different environmental conditions and aggressiveagents: 100% relative humidity (RH), accelerated carbonationat 70% RH and seawater immersion. Portlandcement was partially substituted for SSA in the mixes atrates of 0, 10, 20, 30 and 60% (by mass) to make thedifferent mortars. The results show that where cementwas replaced by SSA at rates of up to 10% by mass,mortar corrosion performance was comparable to thebehaviour observed in SSA-free mortars (control mortar:0% SSA). Data for higher rates are also shown. From themechanical standpoint, SSA exhibited moderate pozzolanicactivity and the best performance when SSA wasadded at a rate of 10% to mixes with a water/(binder:PC + SSA) (w/b) ratio of 0.5.


waste recycling; pozzolan; mechanical strength; corrosion; durability

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