Porogenic Behavior of Water in High-Alumina Castable Structures

Table 1

Characteristics of the raw materials tested.

Physic-chemical properties	Solid particles
	Calcined alumina (CA)	Hydratable alumina (HA)
^aComposition (wt.%)	α-Al2O3: 99.7; Na2O: 0.2; Fe2O3: 0.03; SiO2: 0.34; CaO: 0.03	α-Al2O3: 99.4; Na2O: 0.05; Fe2O3: 0.02; MgO: 0.07; SiO2: 0.03; CaO: 0.02
^bParticles size (D50/D90, μm)	1.5/9.6	7.6/31
^cSolid density (ρ, g·cm^−3)	3.89	2.72
^dSpecific surface area (SSA, m^2·g^−1)	1.3	95
^eLOI (wt.%, 1000°C)	<0.1	8.2

^aX-ray dispersive spectroscopy (EDX 720, Shimadzu, Japan, after calcination at 1000°C for 5 h). ^bDT-1202 (Dispersion Technology Inc., USA). ^cHelium pycnometer method (Ultrapyc 1200e, Quantachrome Instruments, USA). ^dN₂ adsorption (Nova 1200e, Quantachrome Instruments, USA, ASTM C 1069-09 standard). ^eThermogravimetry (TGA-Q50, TA Instruments, 25–1000°C, 5°C·min⁻¹ heating rate and synthetic air atmosphere).