Alkali Activated Paste and Concrete Based on of Biomass Bottom Ash with Phosphogypsum

Applied Sciences

Aras Kantautas¹  Vytautas Bocullo²  Andrius Kielė²  Danutė Vaičiukynienė²  Dalia Nizevičienė³ 

[1] Faculty of Chemical Technology, Kaunas University of Technology, Radvilėnų Pl. 19, LT-50254 Kaunas, Lithuania;Faculty of Civil Engineering and Architecture, Kaunas University of Technology, LT-44249 Kaunas, Lithuania;Faculty of Electrical and Electronics Engineering, Kaunas University of Technology, Studentu St. 48, LT-51367 Kaunas, Lithuania;

关键词: biomass bottom ash;    phosphogypsum;    alkali activated fine-grained concrete;   

DOI  :  10.3390/app10155190

来源: DOAJ

【 摘 要 】

There is a growing interest in the development of new cementitious binders for building construction activities. In this study, biomass bottom ash (BBA) was used as aluminosilicate precursor and phosphogypsum (PG) was used as a calcium source. The mixtures of BBA and PG were activated with the sodium hydroxide solution or the mixture of sodium hydroxide solution and sodium silicate hydrate solution. Alkali activated binders were investigated using X-ray powder diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM) test methods. The compressive strength of hardened paste and fine-grained concrete was also evaluated. After 28 days, the highest compressive strength reached 30.0 MPa—when the BBA was substituted with 15% PG and activated with NaOH solution—which is 14 MPa more than control sample. In addition, BBA fine-grained concrete samples based on BBA with 15% PG substitute activated with NaOH/Na₂SiO₃ solution showed higher compressive strength compered to when NaOH activator was used −15.4 MPa and 12.9 MPa respectfully. The NaOH/Na₂SiO₃ activator solution resulted reduced open porosity, so potentially the fine-grained concrete resistance to freeze and thaw increased.

【 授权许可】

Unknown