Effect of fly and bottom ash mixture from combustion of biomass on strength of cement mortar

A. Wieniewski,A. Chmielarz,Małgorzata Ulewicz,Jakub Jura

doi:10.1051/e3sconf/201712301029

A. Wieniewski, A. Chmielarz + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/201712301029

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Abstract

The preliminary results of fly and bottom ash mixture form combustion od biomass (80% of tree waste and 20% of palm kernel shells) for the produce of ceramic mortars has been presented. Currently, bio- ash from fluidized bed are deposited in landfills. Use of this ash to production of cement mortar instead of sand will reduce the consumption of the mineral resources. The chemical composition of this waste materials was determined using X-ray fluorescence (spectrometer ARL Advant ‘XP). Cement mortar were made using CEM I 42.5 R. The ash were added in an amount 20% of cement weight (in different proportions of fly and bottom ash). The results showed, that the compressive strength (after 28 days) of cement mortar containing ash is higher regardless of the type of ash mixture used. The highest compressive strength (increased by 7.0% compared to the control sample) was found for cement mortars in which the ratio of fly ash to bottom ash was 10/90. This mortars also showed the highest frost resistance (after 150 cycles freezes and unfreeze). The largest decrease the compressive strength (over 18.7%) after the frost resistance test. While cement mortars in which the ratio of fly ash to bottom ash was 90/10 showed the highest frost resistance (after 150 cycles freezes and unfreeze).

Highlights

The replacement of traditional raw material in building materials by fly ash and bottom ash coming from cocombusion of biomass leads to relevant environmental benefits
The highest compressive strength was found for cement mortars in which the percent ratio of fly ash to bottom ash was 10/90
Cement mortars with addition of ash mixture PD/proportions of fly (PL) in percent ratio equal 10/90 and 20/80 showed an increase in frost resistance about 5.7 and15.2% compared with the control sample

Summary

Introduction

The replacement of traditional raw material in building materials by fly ash and bottom ash coming from cocombusion of biomass leads to relevant environmental benefits. It avoids the extraction of large quantities of raw materials from the earth, reduces energy costs and prevents landfill problems. It is important to determine the characteristics of the fly ash and bottom ash produced by the combustion of biomass, because organic and mineralogical composition of the waste and its grain size determine the possibilities of their economic use or utilization. There are no reports on the possibility of the use of fly ash from the combustion only of biomass to production of building materials. Investigations should be carried out, especially for the ashes from combustion of biomass

Experimental

Results and discussion

Conclusion