Abstract
Today with rapidly increasing population and their housing demands, the whole world has been victimized by critical consequences of global warming and climate change. From simple to complex construction, materials being used not only consume massive energy and resources during their life cycle but also deteriorate the environment releasing an enormous amount of dust, solid waste, and greenhouse gases. With an intention to provide immediate solution in the form of sustainable alternative materials, rammed earth is chosen in this study where, natural sub-soil is used as primary constituent, i.e. clay (15–25%), sand (50–60%), gravel (15–20%) with/without small percentage of stabilizer like cement (3–5%), and minimum water (8–12%), and finally tamping the mix in required formwork using simple methods/tools, have clearly justified this construction as low consumer of resources and energy compared to other conventional building materials like brick and cement. This paper outlines environmental impacts of building construction and justifies suitability of rammed earth as an ideal sustainable housing both in terms of environmental and structural stability, based on results obtained from lab tests (compressive strength: 1.5–6.5 MPa, water resistivity, optimum water content) of 100 mm stabilized and un-stabilized cube samples (with variation in moisture content, soil and stabilizer types), site investigation for around 6 years, constructing and demonstrating two small-scaled stabilized and un-stabilized rammed earth houses, discussion with local people, builders and masons. Comparatively, cement-stabilized (5% cement) samples had better overall results than un-stabilized and dung-stabilized samples. In addition, cost comparison showed that 360-mm-thick rammed earth wall was 10–15% cheaper than 230-mm-thick brick wall. Similarly, further verifying and comparing the obtained findings with previous-detailed studies is one of the highlighting parts of this paper.
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Acknowledgements
The author wants to thank all the team members (B.E. Civil batch 2010, Khwopa Engineering College) who participated in model preparation of rammed earth house and the respective faculties. Similarly, the author also wanted to thank Dr. Manjip Shakya and Santosh Shrestha for their valuable suggestions. The suitable working environment provided by Khwopa Engineering College and Rammed Earth Solution Pvt. ltd. is gratefully acknowledged.
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Khadka, B. Rammed earth, as a sustainable and structurally safe green building: a housing solution in the era of global warming and climate change. Asian J Civ Eng 21, 119–136 (2020). https://doi.org/10.1007/s42107-019-00202-5
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DOI: https://doi.org/10.1007/s42107-019-00202-5