Paper Mill Sludge Ash as Supplementary Cementitious Material
by Gabriele Fava, (corresponding author), (Professor, Dept. of Materials and Environment Engineering and Physic (FIMET), Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy E-mail: g.fava@univpm.it), Maria Letizia Ruello, (Researcher, Dept. of Materials and Environment Engineering and Physic (FIMET), Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy.), and Valeria Corinaldesi, (Researcher, Dept. of Materials and Environment Engineering and Physic (FIMET), Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy.)
Journal of Materials in Civil Engineering, Vol. 23, No. 6, June 2011, pp. 772-776, (doi: http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0000218)
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| Document type: |
Journal Paper |
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Special Section: Sustainable Construction Materials |
| Abstract: |
Paper mill sludge is often incinerated for heat recovery and volume reduction. In Italy, about 600,000 t of paper mill sludge is produced yearly. About 6 kg of sludge is produced per ton of paper produced. The paper mill sludge is recovered from a primary mechanical separation process. When it is combusted as a single fuel source, it produces paper mill sludge ash (PA). In this project, PA was studied to evaluate its use as a supplementary cementitious material in mortars and concrete manufacturing. On the basis of the data collected, it was concluded that PA, if used to replace up to 10% of the portland cement, shows a positive effect on the mechanical performance of mortars. On the other hand, because of its high fineness and consequently high water absorption, it required a higher amount of water. It was concluded that the use of PA should not be higher than 10% by weight of the cement replaced, unless mortar mixtures are judiciously proportioned. |
| Author Keywords: | 
| Paper mill sludge ash |
| Compressive strength model |
| Water to binder ratio |
| Modified Abrams relationship |
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