Cement stone, modified by chemical water treatment sludge

Authors:
  • NKNatalya Krasinikova
    Natalya Krasinikova
  • SSSergei Stepanov
    Sergei Stepanov
  • DMDmitry Makarov
    Dmitry Makarov
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Abstract
Chemical treatment of municipal and industrial wastewater is becoming increasingly common in the world, resulting in sludge formation. But only a small fraction of the waste is disposed of. Therefore, the issue of the potential use of these wastes in making construction materials is vital. This paper examines the possible use of multi-tonnage industrial waste, in particular, sludge of chemical water treatment (SHVO) produced by combined heat and power plants in cement systems. Sludge of chemical water treatment is a pasty mass unstable in moisture. For this purpose it is advisable to pre-dry this waste until it becomes a fixed-mass, and then grind it. The impact of SHVO on the technological properties of cement paste and strength properties of cement stone was studied. The article shows that the introduction of SHVO into cement paste increases its water demand. The joint effect of naphthalene formaldehyde and polyester carboxylate-based sludge with additives was studied. Their efficiency depends on the way they are produced. The use of sludge with superplasticizers reduces binding agent consumption by 7.5% without loss of strength properties and reduces porosity of cement stone. It was established that the introduction of SHVO into cement systems changes the physiography of newgrowths.

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