Abstract
The disposal and treatment of solid and hazardous industrial waste is quite expensive for any industry; therefore it brings challenges to find a solution that permits to obtain new, usable products by waste utilization in a technically and economically sustainable as well as environmentally friendly way.The production of lightweight concrete by using aggregates made by industrial by-products and hazardous solid waste such as expanded fly ash, slag, sludge etc. is well known. This research provides possibilities to reuse waste called non-metallic product (NMP) from aluminium scrap recycling factories for the manufacturing of lightweight expanded clay aggregates and lightweight concrete. Characterization of NMP is described in the preliminary publications (Bajare et al. 2012).The manufacturing cycle of lightweight expanded clay aggregates were simulated in laboratory by sintering the clay - waste mixes in the rotary furnace up to 1200°C. Lightweight expanded clay aggregates with rather different pore structure were obtained due to slight variations of mixture composition and sintering temperature. Produced aggregates were with bulk density from 320 kg/m3 to 620 kg/m3. Different types of lightweight aggregates were used to produce lightweight concretes. Mechanical, physical and thermal conductivity tests were performed for hardened concrete specimens according to standard procedures.DOI: http://dx.doi.org/10.5755/j01.sace.4.5.4188
Highlights
Lightweight aggregates are granular and porous materials with a bulk density in a range of 280 kg/m3 to 1100 kg/m3, depending on the type and grading size (Owens, 1993)
Lightweight aggregate with different density and crushing strength can be produced by using laboratory rotary kiln with the identical sintering temperature of 1180°C and regime, but changing non-metallic product (NMP) amount in composition of raw materials
Laboratory sintered aggregates LA and LB are with significantly lower water absorption up to 12% compared with the commercially available aggregates A1 and A2 (~18%)
Summary
Lightweight aggregates are granular and porous materials with a bulk density in a range of 280 kg/m3 to 1100 kg/m3, depending on the type and grading size (Owens, 1993). For their low density, good thermal and acoustic insulation, and good fire resistance properties, lightweight aggregates have become a focus of interest. When the water/cement ratio of concrete increases, the number of pores within the cement paste and in the aggregate/cement paste interfacial zone increases as well. An increase in pore numbers within the cement paste and in the aggregate/cement paste interfacial zone leads to a corresponding decrease in concrete strength (Tommy and Tang, 2007)
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