Self-Compacting Recycled Concrete Using Biomass Bottom Ash.

Manuel Cabrera,Mónica López-Alonso,M J Martinez-Echevarria,Francisco Agrela,Julia Rosales

doi:10.3390/ma14206084

Manuel Cabrera, Mónica López-Alonso + Show 3 more

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https://doi.org/10.3390/ma14206084

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Journal: Materials	Publication Date: Oct 14, 2021
Citations: 10	License type: CC BY 4.0

Affiliation: University of Córdoba

Abstract

In recent years, the use of self-compacting concrete has been a great advantage and garnered undoubted interest in construction. Due to the environmental impact caused by the consumption of natural aggregates in the manufacture of concrete, a more sustainable approach is needed. An approach for more sustainable construction is to use industrial waste such as bottom ash from the combustion of biomass as a replacement for natural aggregates. This research aims to use biomass bottom ash as a replacement for natural sand (10%, 20% and 30% replacement); in addition, by utilizing a crushing process of the bottom ash, the ash has been used as a filler replacement (replacement 20%, 40% and 60%). The fresh and hardened properties have been evaluated according to the standard. The results show the feasibility of using biomass bottom ash in self-compacting concrete, providing a sustainable alternative in order to minimise environmental impacts related to the extraction and depletion of natural resources.

Highlights

One of the most significant advances in the construction industry has been the development of self-compacting concrete (SCC), called high-performance concrete by some authors
The compressive strength was determined on 100 mm × 100 mm cubic samples for ages 7, 28, 90 and 256 days according to EN 12390-3: 2019
Some authors focus on the substitution of coarse and fine fraction of natural aggregates, obtaining substitution ranges depending on the type of industrial by-product used [39]

Summary

Introduction

One of the most significant advances in the construction industry has been the development of self-compacting concrete (SCC), called high-performance concrete by some authors. This type of concrete is known for its excellent deformability and resistance to segregation. In general, has undergone great changes in its dosage to achieve better strengths and obtain better durability. To this end, many studies have included materials such as fly ash [5,6], fly ash with polymers [7], silica fume [8], metakaolin [9] additives, etc

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