Cement stone, modified by chemical water treatment sludge

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.

Building a Greener Future: Advancing Concrete Production Sustainability and the Thermal Properties of 3D-Printed Mortars

“…Sludges from wastewater treatment plants containing heavy metals, like aluminium or other toxic residues [71], need previous solidification and stabilisation to be included in concrete [72].…”

Upgrading the hot water supply system as a way to save energy

“…Most works on energy conservation consider the tasks of reducing the price of energy and dependence on fossil fuels, the use of renewable energy sources and CHP waste [7][8][9][10][11][12] and reduction of heat losses during transportation [13][14][15][16], influence of insulation thickness on cost parameters and corresponding savings in heat supply system [14,17], reducing air pollution and actually saving carbon emissions [18], environmental impact of district heating systems and determination of combustion products parameters [17,[19][20][21][22][23]. Improvement of energy efficiency of heat supply systems of Russian cities when replacing central heat points with individual heat points is considered in the work [24], identification and disclosure of the main problems of deterioration of the quality of thermal protection of buildings, increase of thermal losses [25].…”

Quality improvement of monolithic steel fiber concrete floor slabs with void formers

“…Increasing the efficiency of the device monolithic steel fiber concrete floor slabs with void formers can be achieved through the use of modified concrete mixtures based on waterproof gypsum binder [13][14], cement [15][16][17][18][19][20] and mixed binders [21][22][23].…”