Effect of curing time on microstructure and mechanical strength development of alkali activated binders based on vitreous calcium aluminosilicate (VCAS)

Bulletin of materials science

L Soriano¹  J Monzó¹  M M Tashima¹  J Payá¹  M V Borrachero¹ 

[1] Instituto de Ciencia y Tecnología del Hormigón, Universitat Politècnica de València, Camino de Vera s/n, Edificio 4G, 46022 Valencia, Spain$$Instituto de Ciencia y Tecnología del Hormigón, Universitat Politècnica de València, Camino de Vera s/n, Edificio 4G, 46022 Valencia, SpainInstituto de Ciencia y Tecnología del Hormigón, Universitat Politècnica de València, Camino de Vera s/n, Edificio 4G, 46022 Valencia, Spain$$

关键词: Compressive strength;    alkali activation;    vitreous calcium aluminosilicate;    geopolymerization.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The aim of this paper is to study the influence of curing time on the microstructure and mechanical strength development of alkali activated binders based on vitreous calcium aluminosilicate (VCAS). Mechanical strength of alkali activated mortars cured at 65 °C was assessed for different curing times (4�??168 h) using 10 molal NaOH solution as alkaline activator. Compressive strength values around 77MPa after three days of curing at 65 °C were obtained. 1.68MPa/h compressive strength gain rate was observed in the first 12 h, decreasing to 0.95MPa/h for the period of 12�??72 h. The progress of geopolymeric reaction was monitored by means of TGA and, electrical conductivity and pH measurements in an aqueous suspension. Significant decrease in pH and electrical conductivity were observed in the 4�??72 h period, demonstrating the geopolymerization process. Furthermore, SEM images showed an important amount of (N, C)ASH gel and low porosity of the developed matrix.

【 授权许可】

Unknown