COMMENTARY
Contrary to commonly-held beliefs, recycled materials are actually not secondary and, in some cases, they even improve the engineering properties.
tensile and flexural strength of the concrete4
. Adding this aggregate at 25
per cent into a concrete mixture can yield better performance under the conditions of sulphate attack, carbonation, chloride ion penetration and rising temperature5
.
CONCLUSION & RECOMMENDATION Tyre and tile waste can increase strength, index properties, compaction parameters, compressibility and settlement of soft soils, as well as concrete admixtures. Thus far, these two additive materials have only been used separately. Future research and development may be needed to look into the possibilities of using them together. Also, we should further explore the impact of different microstructural sizes—such as finer grains of less than 63 microns—because the smaller the size, the better the stabilising effect could be.
But the real question is, why does the use of sustainable materials like this remain lacking in the construction industry? One possibility is because companies are not aware of the availability and quality of these materials; or they are, but the market demand is low. Collaboration between researchers and the industry should,
therefore, be encouraged to
increase the awareness and expedite the development of material technologies and innovations.
For further reading: Al-Bared, M. A. M., Marto, A., & Latifi, N. (2018). Utilization of recycled tiles and tyres in stabilization of soils and production of construction materials–A state-of-the-art review. KSCE Journal of Civil Engineering, 22(10), 3860-3874.
1Prasad, D. S. V. and Raju, G. V. R. P. (2009). “Performance of waste tyre rubber on model flexible pavement.” ARPN Journal of Engineering and Applied Sciences, Vol. 4, No. 6,
pp. 89-92. 2
Baraiya, N. D. (2013). “Use of waste rubber tyres
in construction of bituminous road – an overview.” International Journal of Application or Innovation in
ZAHIRANIZA MUSTAFFA, PhD, is an associate professor at the Department of Civil and Environmental Engineering, Universiti Teknologi Petronas for more than 15 years. Her specialisation is in the field of pipeline engineering, hydraulic engineering, urban hydraulics and probabilistic structural designs. She is currently an Honorary Secretary of the women engineers’ section of the Institute of Engineers (IEM), Malaysia; as well as a Chartered Engineer of the Engineering Council, UK, and graduate member of Board of Engineer Malaysia (BEM).
Daud, N. N. N., Yusoff, Z. M., and Muhammed, A. S. (2015). “Ground improvement of problematic soft soils using shredded waste tyre.” 6th International Conference
Engineering & Management, Vol. 2, No. 7, pp. 108-110. 3
on Case History in Geotechnical Engineering, pp. 1-5. 4
Singh, S., Nagar, R., and Agrawal, V. (2016a). “A review
on properties of sustainable concrete using granite dust as replacement for river sand.” Journal of Cleaner Production,
Vol. 126, pp. 74-87 5
Singh, S., Nagar, R., and Agrawal, V. (2016b). “Performance
of granite cutting waste concrete under adverse exposure conditions.” Journal of Cleaner Production, Vol. 127, pp. 172-182, DOI: 10.1016/j.jclepro. 2016.04.034.
AMINATON MARTO, PhD, is currently a
visiting professor at the Disaster Preparedness and Prevention Centre of Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia. Her specialisations are in soft soil engineering, geotechnical investigation, geotechnical earthquake engineering, disaster mitigation and forensic engineering. She pioneered research on bamboo-geotextile composite, as well as coal ash for soft soil improvements and other applications.
C M Y CM MY CY CMY K
MOHAMMED ALI AL-BARED, PhD, is a post- doctoral research scientist at the Department of Civil and Environmental Engineering, Universiti Teknologi Petronas, Malaysia. He has extensive research experience and published numerous articles in journals and international conferences in the areas of civil engineering, geotechnical and geological engineering. He is currently working on soft soil improvement techniques in terms of dynamic and static loading effect.
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