Performance of local fly ash geopolymers under different types of acids

International Conference on Innovative Research - ICIR EUROINVENT 2019

Burduhos Nergis, D.D.^1 ; Vizureanu, P.^1 ; Andrusca, L.^1 ; Achitei, D.C.^1

Gheorghe Asachi Technical University of Iasi, Blvd. Mangeron No. 51, Iasi

700050, Romania^1

关键词: Civil engineering applications;    Corrosive environment;    Degradation degree;    Environmental conditions;    Mineralogical compositions;    Ordinary Portland cement;    Sulfuric acid and hydrochloric acid;    Three-dimensional structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/572/1/012026/pdf
DOI  :  10.1088/1757-899X/572/1/012026

来源: IOP

【 摘 要 】

A new class of ceramic materials, known as geopolymers, possess comparable or even higher mechanical and chemical properties than ordinary Portland cement-based materials. Because geopolymers can be used in a wide variety of areas, from civil engineering applications to decorative objects manufacturing, they can get in contact with different types of acidic corrosive substances. The degradation degree depends mostly on the acidic solution concentration and the exposure time. Due to the interaction between the geopolymer compounds, Al, Si and Fe ions solubility and the corrosive environment substance, there may follow severe consequences on the material mechanical properties. These consequences are highly related to the geopolymers three-dimensional structure degeopolymerization. The performance of geopolymers under severe environmental condition depends on the raw material, mineralogical composition and activation method. The aim of this paper is to present the effects of nitric acid, sulfuric acid and hydrochloric acid exposure on the local fly ash geopolymers compressive strength and microstructure.