Construction of lightweight and resistant concrete with silica and wooden particles

Abstract

This research is aimed to investigate the possibility of making resistant Light concrete and the effects of different levels of wood and silica particles on physical, mechanical and morphology was performed. Granulation wood particles to 5 levels, 0, 5, 10, 15 and 20% and silica particles in a scale of nanometers and micrometers to 4 levels, 0, 3, 6 and 9% based on dry weight of cement were the variables of this research. Mixing process was is done manually and cement paste produced into a square molds were cast. To amass gel of cement was used from the vibrating table. After making concrete physical properties including water absorption, moisture diffusion coefficient and density in accordance with ASTM standard and mechanical properties including compressive strength and compressive strength index accordance with the regulations for concrete Iran (ABA) was performed. Infrared spectroscopy to evaluate the impact of silica particles were made of concrete. Scanning electron microscope to study the morphology of concrete were used. The results showed that by increasing the amount of wood, density, compressive strength and compressive strength index decreased while water absorption and moisture diffusion coefficient increased. Silica increases to 3 percent, increased compressive strength and compressive strength index and addition of more silica have a negative impact on the properties. Water absorption of samples by adding silica to 3 percent decreased and then increased. Density of samples increased with increasing silica. With increasing of silica to 3 percent, moisture diffusion coefficient was decreased but then the moisture diffusion coefficient increased with increasing silica. Infrared spectroscopy showed that addition of silica peak was reduced to a hydroxyl group. The results of scanning electron microscope showed good distribution of silica particles on the surface of 3 percent.

Keywords

• Lightweight concrete
• Nano silica
• Compressive strength
• Scanning electron microscopy