Determination of optimal percent mixing of cardboard waste in production of non-load bearing concrete
Subject Areas : environmental managementDaryoush Yousefi Kebria 1 , Seyyedeh Fatemeh Seyyedalipour 2 , Mehdi Dehestani 3
1 - Assistant professor, Department of Civil & Environmental engineering, Babol Noshirvani University of
Technology, Babol, Iran.
2 - MSc in Environmental engineering Department of Civil & Environmental engineering, Babol Noshirvani
University of Technology, Babol, Iran
3 - Assistant professor, Department of Civil & Eenvironmental engineering, Babol Noshirvani University of
Technology, Babol, Iran.
Keywords: Industrial Wastes, Recycled Paperboard Mill, Non-load Bearing Lightweight C, Compressive Strength,
Abstract :
incineration and disposal methods for their waste production. Hazardous substances contained in thesewastes can contaminate the environment and cause a risk for the human health. Many recent studiesshow that some of the paper and cardboard industry wastes can be used as raw material in theconstruction industry. The aim of this study was to determine the optimal percent mixing of cardboardwaste in production of non-load bearing concrete.Materials and method: In this study, two kinds of recycled paperboard mill wastes (type 1: wastecontains cardboard and sand and type 2: waste containing nylon, cardboard and Yonolit) that have themost volume of the wastes were used. Physical and microbial characteristic of wastes were measuredaccording to ASTM. As well as the chemical composition of the waste consists of various elementswere measured by using an electron microscope. After preparation of the samples, the required testswere carried out to determine the optimal mixture of waste in concrete at the ages of 7, 14 and 28 daysrespectively.Results: Since the pH of fresh concrete containing waste is greater than 12, can be sure that therewill not be any microbiological problem. In general, the use of waste in concrete production reducesthe compressive strength of the samples. Comparing the compressive strength of concrete containingwaste type 1 and concrete samples containing both waste types shows that reducing the amount ofwaste type 2 in compare with waste type 1 improves concrete strength. The results of dry density testshow the density decrease of concrete samples containing waste by increasing the percentage of wastereplacing in the sand. Also using of waste type 2 causes lighter concrete samples in compare withusing waste type 1. Optimal amounts of waste replacement instead of sand for samples containingwaste type 1 and type 2, 70% and 75% ,respectively, as well as for samples containing both wastetypes, 49% of waste type 1 and 21% waste type 2.1- Assistant professor, Department of Civil & Environmental engineering, Babol Noshirvani University ofTechnology, Babol, Iran.2- MSc in Environmental engineering Department of Civil & Environmental engineering, Babol NoshirvaniUniversity of Technology, Babol, Iran.3- 1-Assistant professor, Department of Civil & Eenvironmental engineering, Babol Noshirvani University ofTechnology, Babol, Iran.J.Env.Sci,TechJ.Env. Sci. Tech., Vol 17, No.3, Autumn 2015203Conclusion: According to the results, in terms of economic and environmental benefits, the use ofwaste type 1 in the production of concrete for the lower use of cement is more satisfactory. The use ofpaperboard mill wastes in the production of concrete due to environmental and economical efficiency(profitability and employment, reducing the cost of transferring waste to landfills, reducing structuralweight, using waste instead of buying sand and reduce the environmental pollution caused byincineration and landfilling) is noticeable.
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