Abstract
In line with the trend of using waste raw materials in the technology of building materials, experimental studies of cement mortars containing various amounts of fine-grained waste aggregate were carried out. The waste aggregate was based on an incinerated municipal sewage sludge which was mechanically crushed to an appropriate grading. Chemical and physical properties of the waste aggregate are presented. Mortars with varying amounts of waste aggregate as a replacement for natural sand were prepared. Study determines compressive strength and flexural strength up to 56 days. Properties such as capillary action, air content and thermal conductivity were determined. The results of the tests has shown that the incinerated waste sludge can be used as a partial or total replacement for natural aggregate. In mortars with waste aggregate, a favorable relation between flexural and compressive strengths was observed, which translates into increased strength of the interfacial transition zone. A significant increase in water absorption was observed for mortars containing high amounts of waste aggregate, which is directly related to its porous structure. Conducted studied prove that the aggregate obtained from incineration of the municipal sewage sludge can a feasible alternative for natural aggregates in production of masonry and rendering mortars for construction purposes.
Highlights
In light of the increasing demands for environmental protection [1,2,3] and, above all, restoring water quality, a growing number of newly build and modernized wastewater treatment plants is being observed
To those obtained during the treatment processes we can include, screenings, sand, fats, and initial and secondary sludges, which are removed in the largest amount
While the ash from the incineration collected in the lower part of the boiler is removed periodically, the exhaust gases are directed to the secondary combustion chamber, to the heat exchanger, and last but not least are purified by filters
Summary
In light of the increasing demands for environmental protection [1,2,3] and, above all, restoring water quality, a growing number of newly build and modernized wastewater treatment plants is being observed. This study determines the basic parameters of cement mortars with fine aggregate obtained from the process of incineration of municipal sewage sludge. TThhee mmiiccrrooggrraapphh aanndd eelleemmeenntt iiddeennttiiffiiccaattiioonn bbyy mmeeaannss ooff EEDDSS aarree pprreesseenntteedd iinn FFiigguurree 11. The ash-slag generated from thermal disposal of municipal sewage sludge (Figure 4), comes from the Pomorzany Waste Water Treatment Plant (Szczecin, Poland). It was produced by drying the sludge in a contact dryer and incinerating it in a moving. The ash-slag generated from thermal disposal of municipal sewage sludge (Figure 4), comes from the Po(ma)orzany Waste Water Treatment Plant (Szc(zbe)cin, Poland). That was not consumed by the hydration, evaporates during maturation of concrete, leaving the micropores, which weaken the structure of the composite
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