Use of Alkaline Activated Cements from Residues for Soil Stabilization
J. Cosa, L. Soriano, M.V. Borrachero, J. Payá, J. Monzó
Abstract. In recent decades, Portland cement (OPC) production has grown significantly as a result of economic and population growth. However, the cement industry is classified as a highly polluting sector and of great environmental impact. The production of one tonne of OPC requires the exploitation of a high volume of raw materials (mainly limestone and clay) and the emission of one tonne of CO2 and other polluting gases (NOx and SOx). The OPC is the most used binder in soil stabilization, one of the alternatives with less environmental impact, is the use of so-called alkaline activated cements (AAC) and / or geopolymers. In the research work, is used a fluid catalytic cracking catalyst (FCC) residue as a precursor and a mixture of rice straw ash (RSA) and sodium hydroxide as activator. Reducing the economic and environmental cost, making it viable in developing countries. To obtain the RSA, a burner has been designed and built in which the rice straw is transformed into RSA. During the burning process, the different burning zones and their temperatures were studied. The objective of these measurements is to obtain the optimum quality RSA to synthesis of the alkaline activator in the geopolymerization reaction. The AAC was used for soil stabilization, the compressive strengths were obtained for ages between 7 and 90 days. Soils were stabilized with OPC and AAC, and the results were compared, being higher the results with OPC. However, the compressive strengths obtained with the AAC were sufficient for the stabilization of the soils.
Sustainable Construction Materials, Waste Reuse, Alkali Activated Cement, Soil Stabilization
Published online , 8 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: J. Cosa, L. Soriano, M.V. Borrachero, J. Payá, J. Monzó, ‘Use of Alkaline Activated Cements from Residues for Soil Stabilization’, Materials Research Proceedings, Vol. 7, pp 257-264, 2018
The article was published as article 23 of the book Non-Conventional Materials and Technologies
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