軽量発泡コンクリート中のナノシリカ

軽量発泡コンクリート (LFC) エアクリートは、粗骨材を含まず、水を混合して作られる代替軽量コンクリートの一種です。, セメントと発泡体. 自重が軽いです, greater workability and superior insulating properties but less strength than normal-strength concrete. It can be used in load bearing structural applications with the right mixture design and production methods.

This paper is a comprehensive evaluation of the effects of nanosilica (NS) on the compressive strength, 乾燥収縮, thermal conductivity and the sorption of ultra-軽量発泡コンクリートs (ULFCs) with a density lower than 350 kg/m3. The experiments were conducted in a 50 L Eirich mixer using a shear intensity up to 1000 rpm. The fine materials were dry-mixed for 30 s and then water, superplasticizer and stabiliser were added to form the cement slurry. Air was then injected to produce the foamed mass.

The results of the investigation indicated that the addition of NS improved the fresh and hardened characteristics of the ULFCs, particularly its compressive strength. 一般的に, the solid structure of ULFC specimens with NS contained thicker walls, which contributed to its higher compression strength.

It was also found that the hydration process of ULFCs with NS takes place faster than in the case of SF due to its smaller particle size. The NS incorporated in the ULFCs also modifies their pore structure and increases the connectivity between the voids. This significantly reduces the drying shrinkage of ULFC.