Materiales de Construcción, Vol 52, No 267 (2002)
Use of dry sludge from waste water treatment plants as an additive in prefabricated concrete brick
https://doi.org/10.3989/mc.2002.v52.i267.324
A. Yagüe
Dept. Ingeniería de la Construcción, Universitat Politècnica de Catalunya, ETSECCPB, Spain
S. Valls
Dept. Ingeniería de la Construcción, Universitat Politècnica de Catalunya, ETSECCPB, Spain
E. Vázquez
Dept. Ingeniería de la Construcción, Universitat Politècnica de Catalunya, ETSECCPB, Spain
V. Kuchinow
UBENA, BBS, S.L, Spain
Abstract
After characterising the sludge and the manufacturing process used to make the bricks, we define the conditions of addition of the sludges in the manufacture. Reference samples not containing sludge and samples containing 2 % of dry sludge by cement weight were prepared. The variation in density, porosity, absorption coefficient and compressive strength of the bricks with the presence of sludge was determined over time. Leaching of the bricks was determined according to the NEN 7345 standard.
In most cases the addition of sludge produces a decrease in porosity and absorption coefficients and an increase in compressive strength, so one could expect these bricks to have greater durability. As regards leaching pollutants in the bricks, they are below the limit of the Dutch NEN standard for construction materials and thus can be classified as inert material.
Keywords
Copyright (c) 2002 Consejo Superior de Investigaciones Científicas (CSIC)

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