Preprint Article Version 1 This version is not peer-reviewed

Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin

Version 1 : Received: 15 December 2019 / Approved: 16 December 2019 / Online: 16 December 2019 (11:15:41 CET)

A peer-reviewed article of this Preprint also exists.

Bonet-Martínez, E.; García-Cobo, P.; Pérez-Villarejo, L.; Castro, E.; Eliche-Quesada, D. Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin. Materials 2020, 13, 901. Bonet-Martínez, E.; García-Cobo, P.; Pérez-Villarejo, L.; Castro, E.; Eliche-Quesada, D. Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin. Materials 2020, 13, 901.

Journal reference: Materials 2020, 13, 901
DOI: 10.3390/ma13040901

Abstract

In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75 and 100 wt. % substitution) for the synthesis of geopolymers. As alkaline activator an 8 M NaOH solution and a Na2SiO3 have been used. The geopolymers were cured 24 hours in a climatic chamber at 60 ° C in a water-saturated atmosphere, subsequently demoulded and cured at room temperature for 28 days. The results indicated that the incorporation of OPBA waste, which have 19.7 wt. % of Ca, modifies the characteristics of the products formed after alkaline activation. In general terms, the incorporation of increasing amounts of calcium-rich ashes results in geopolymers with higher bulk density. The compressive strength increases with the addition of up to 50 wt. % of OPBA with respect to the control geopolymers, contributing the composition of the residue to the acquisition of a better behaviour mechanical. The results indicate the potential use of these OPBA waste as raw material to produce unconventional cements with 28-day curing strengths greater than 10 MPa, and thermal conductivities less than 0.35 W/mK.

Subject Areas

geopolymers; metakaolin; biomass bottom ash; mechanical properties

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