Figure 7. Microstructure of bricks formed with pressure (a) 1000 psi (b) 2000 psi (c) 3000 psi [All magnification 500X]

From

Experimental Studies on Fly Ash-Sand-Lime Bricks with Gypsum Addition

Tahmina Banu, Md. Muktadir Billah, Fahmida Gulshan, ASW Kurny

American Journal of Materials Engineering and Technology. 2013, 1(3), 35-40 doi:10.12691/materials-1-3-2