נאַנאָסיליקאַ אין לייטווייט פאָומד באַטאָנען

lightweight foamed concrete (לפק) אָדער ערקרעטע איז אַ טיפּ פון אָלטערנאַטיוו לייטווייט באַטאָנען וואָס כּולל קיין פּראָסט געמיינזאַם און איז געמאכט דורך מיקסינג וואַסער, צעמענט און פּינע. It has a lower self-weight, 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, דריינג שרינגקידזש, thermal conductivity and the sorption of ultra-lightweight foamed concreteס (ULFCs) with a density lower than 350 קג/מ3. The experiments were conducted in a 50 L Eirich mixer using a shear intensity up to 1000 רפּם. 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. אין אַלגעמיין, 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.