Calcium Silicate Materials: Substitution of Hydrated Lime by Ground Granulated Blast Furnace Slag in Autoclaving Conditions

• Published in: Journal of materials in civil engineering Vol. 24; no. 9; pp. 1230 - 1236
• Main Authors: Arabi, Nourredine, Jauberthie, Raoul
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01.09.2012
• Subjects: Applied sciences; Autoclaving; Blast furnace slags; Buildings. Public works; Calcium silicates; Ceramic. Refractories. Terra cotta; Civil Engineering; Compressive strength; Engineering Sciences; Exact sciences and technology; Granulation; Lime; Materials; Scanning electron microscopy; Technical Papers; X-ray diffraction; Heat treatment; Hydrated lime; Granular media; Construction materials; Calcium silicate; Lime; Granulated blast-furnace slag; Hydrothermal curing; Substitution; Granular material; Production; Granulated slag; Blast furnace slag; Scanning electron microscopy; Hydration; Bricks; Experimental study; X ray diffraction; Brick; Curing; Slag; Product development; Calcium silicate bricks; Autoclaving; Strength
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000480

AbstractThis paper deals with progressive substitution of hydrated lime by granulated blast furnace slag to produce new calcium silicate materials obtained by autoclaving, representing an alternative economic raw material. The slag grain-size grinding and the heat treatment in saturated vapor pressure autoclave conditions were investigated to study the compressive strength behavior of the new material. The results showed a decrease in compressive strength from the substitution. The microstructure analysis showed that reaction products consist mainly of 11 Å tobermorite and xonotlite. When increasing the autoclave temperature, it results in an increase in xonotlite relative to tobermorite. It is also observed that the amorphous composition of granulated blast furnace slag does not release new distinct phases of hydrates. The autoclaved products were characterized using X-ray diffraction (XRD) technique and scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDX).