Abstract
Power generation from biomass is one of the most promising energy sources available today. However, this industry has a series of wastes derived from its activity, mainly biomass fly ash and biomass bottom ash. Biomass bottom ash is a waste that has no current use and, in most cases, is deposited in landfills. In turn, road construction is one of the activities that produces the most pollution, as it requires huge amounts of raw materials. Therefore, this research proposes the use of biomass bottom ashes, in an unaltered form, for the formation of cold in-place recycling with bitumen emulsion. This type of mixture, which is highly sustainable owing to the use of a high percentage of waste, was made with reclaimed asphalt pavement, biomass bottom ash, water, and bitumen emulsion. To this end, the grading curve of the materials was analyzed, different bituminous mixtures were made with varying percentages of emulsion and water, and the mechanical properties of the mixtures were analyzed. At the same time, the same type of mix was made with reclaimed asphalt pavement and commercial limestone aggregate, in order to compare the results. The tests showed a better mechanical behavior of the bituminous mixes made with biomass bottom ash, maintaining physical properties similar to those of conventional mixes. In short, it was confirmed that the production of this type of mix with biomass bottom ash was feasible, creating sustainable materials that reuse currently unused waste and avoid landfill disposal.
Highlights
The development of the population’s well-being has led to a significant consumption of natural resources and a high environmental impact [1]
This section describes the materials used in this research, as well as the tests carried out to evaluate the bituminous mixtures made with reclaimed asphalt pavement (RAP)
Once the constituent materials of the bituminous mix, RAP and biomass bottom ash (BBA), were characterized, we proceeded to determine the percentage of combination of both materials to obtain, on the one hand, a grading curve within the envelope grading defined by the standards; and on the other hand, to incorporate a sufficient percentage of BBA to improve the mechanical characteristics of the bituminous mix conformed, thanks to the cementitious properties of the BBA corroborated by different authors
Summary
The development of the population’s well-being has led to a significant consumption of natural resources and a high environmental impact [1]. Biomass bottom ash in this type of mixture, a cold in-place recycling with bitumen emulsion, has two main functions: to correct the granulometry of the milled pavement by providing the fine fraction of the aggregate, as usually, the milled pavement has a low proportion of fine aggregate and filler; on the other hand, to provide cementitious properties to the mixture of water and bituminous emulsion, developing better mechanical characteristics These cementitious properties of biomass bottom ash derive directly from its chemical composition and have been corroborated by different authors [29,30]. A sustainable material for road construction is obtained
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