Comparative study between structural and electrical properties of geopolymers applied to a green concrete

2nd International Meeting for Researchers in Materials and Plasma Technology

物理学;材料科学

Montaño, A.M.^1,2 ; González, C.P.^2 ; Pérez, J.^1 ; Royero, C.^1 ; Sandoval, D.^1 ; Gutiérrez, J.^1

Escuela de Química, Universidad Industrial de Santander, Bucaramanga, Colombia^1

Grupo de Investigación en Materiales-GIM, Departamento de Ciencias Básicas, Universidad Pontifica Bolivariana Seccional Bucaramanga, Floridablanca, Colombia^2

关键词: Cementitious materials;    Comparative analysis;    Comparative studies;    Crystallographic phasis;    Electrical impedance;    Electrical resistances;    Properties of concretes;    Structural and electrical properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/466/1/012013/pdf
DOI  :  10.1088/1742-6596/466/1/012013

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This work shows a comparative analysis of geopolymers obtained by alkaline activation of two aluminosilicates: bentonite and metakaolin. With the goal of to replace some cement percentage, both aluminosilicates were added in several proportions (10, 20 and 30%) to concrete mixes. Portland Type I cement was used to prepare the reference concrete (without geopolymer). X-ray diffraction of geopolymers allowed to find new crystallographic phases that was not present in precursor's minerals. To evaluate mechanical properties of concrete prepared with geopolymers, test tubes with 7, 14, 28 and 90 days as setting time were used. Chemical resistance and Electrical impedance of concrete mixes were also measured. Results shows that cementitious material obtained from metakaolin exhibit the best compressive strength. On the other hand, those materials derived from bentonite, have a high electrical resistance so that, they protected reinforced concrete better that Portland does.