Effect of Agricultural Crop Wastes as Partial Replacement of Cement in Concrete Production

Table 9

Morphological, mineralogical, and physical characteristics of RHA.

Authors	Morphology	Mineral	Specific gravity	Particle size D50 (µm)	Color	Surface texture
Khan et al. [56]	Amorphous	Silica	2.1			✓ Particles with micropores
						✓ Irregular shape
Antiohos et al. [57]	Amorphous	✓ Mainly silica and cristobalite		70.46		✓ Interconnected porous network
		✓ Limited tridymite				✓ Coarse with large porosity
						✓ Teeth-like outer shape
Raheem and Kareem [58]	Amorphous	Silica
Krishna et al. [60]		Silica	1.95
Abiodun and Jimoh [61]	Amorphous	Silica	2.36	45	Grey	Fine
Salas et al. [62]	Amorphous	Silica	2.16	19	White and pink