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The Potential of Recycled Locally-Sourced Waste Materials for Green Roof Soil Mixtures

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Abstract:

The increase in surface runoff has become a serious environmental problem and concern in Malaysia. Hence, promoting the use of green roofs in urban areas will potentially allow some storage area and time attenuation for any rainfall. Initial studies on a few substrate mixtures were done in order to find out the properties of green roof media. These included vermiculite (V), perlite (P) and peat moss (PM) together with locally-sourced waste materials such as empty fruit bunches (EFB) and wet diaper gel (D) which are expected to potentially retain more storm water runoff. A test on the substrate mixture properties and evaporation tests were conducted on seven types of soil mixtures. The results show that a basic substrate mixture of PVPM3,5,2 has a maximum water capacity of 50%. The modification and addition of diaper gel in DVPM1,3,2 and empty fruit bunch (EFB) in PEFBPM1,0.3,2 show an increment in both mixtures’ water holding capacity (54%). All the proposed mixtures have shown permeability values larger than 0.0005 cm/s. To investigate the maximum water storage availability, the evaporation tests show that both mixtures could provide 60 - 62 mm of water storage after 34 days without rainfall under ambient climatic condition (32 ̊ to 34 ̊) whereas under extreme heat temperatures (50 ̊), both mixtures took only 1 day to provide the same storage as the ambient condition. Therefore, this study has provided an initial understanding of the properties of the substrate mixture as well as the evaporation rate of the materials tested. This information can be used to demonstrate the relationship between soil characteristics and local climatic factors (temperature).

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Info:

Periodical:

Key Engineering Materials (Volume 730)

Pages:

445-451

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.730.445

Citation:

Cite this paper

Online since:

February 2017

Authors:

Hartini Kasmin*, Siti Nur Ummiah Munir, Nur Syafira Razak, Nor Azizi Yusoff, Rosniza Kassim, Hanim Ahmad, Zulhazmi Sayuti

Keywords:

Evaporation Rates, Evapotranspiration Rates, Green Roof, Recycle Material, Soil Materials, Substrate Mixture

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* - Corresponding Author

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