Sustainable usage of waste materials as stabilizer in rammed earth structures

Kosarimovahhed, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jclepro.2020.123279
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Rammed earth (RE) is an eco-friendly building material and has been capturing special attention among researchers. Many of the recently studied RE additives are extremely resource- and energy-consuming. On the other hand, the usage of fly ash (FA), which is a sustainable replacement for cement, has been scarcely investigated in RE construction. In this paper, an experimental investigation was performed on the physical and mechanical properties of RE materials stabilized with the combination of cement and alkali-activated FA. This scrutiny consists of density measurements, pulse velocity tests, unconfined compression tests, and direct shear tests. Additionally, the carbon dioxide emission and unit cost of each mix were estimated using the available literature. Finally, a multi-objective optimization was performed using the response surface method to determine the optimum mixture. The optimization goals were the maximization of strength parameters in addition to minimization of cost, density, and carbon footprint. Based on the optimization criteria, it was found that 0.7% of cement and 6.5% of FA was the suitable stabilizer choice for RE contractors. © 2020 Elsevier Ltd
  6. Keywords:
  7. Alkali-activated fly ash ; Cement ; Multi-objective optimization ; Stabilized rammed earth ; Sustainability ; Additives ; Carbon dioxide ; Carbon footprint ; Compression testing ; Fly ash ; Global warming ; Multiobjective optimization ; Shear flow ; Carbon dioxide emissions ; Eco-friendly buildings ; Experimental investigations ; Minimization of costs ; Optimization criteria ; Physical and mechanical properties ; Response surface method ; Unconfined compression tests ; Cements
  8. Source: Journal of Cleaner Production ; Volume 277 , December , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0959652620333242