Efek tahan lama bubuk Silika

Durabilitas beton kalebu resistensi fros beton, impermeabilitas, resistensi kimia, resistansi korosi baja lan resistensi erosi. Aku mung bakal ngomong babagan resistensi fros, impermeabilitas lan resistensi kimia menyang beton. Efek erosif.
a) resistensi Frost: Nalika jumlah sakaBubuk Silikacilik, tahan es saka beton asap silika umume padha karo beton biasa. Nalika jumlah bubuk silika ngluwihi 15%, resisten frose kurang. Liwat tes sing akeh, pandhangan iki pancen wis dikonfirmasi. Alesan utamane yaiku yen asap silika ngluwihi 15%, ekspansi beton mundhak, modulus elastis dinamis relatif mudhun, lan kekuatan kompres mudhun banget. Saka perspektif karakteristik internal beton, Area permukaan khusus cilik, lan koefisien jarak gedhe.
b) Impermeability: Because Bubuk Silika particles are small, 20-100 times smaller than cement particles, they can be filled into the voids between cement particles to make concrete compact. At the same time, the secondary hydration of silica powder blocks new products. Permeation channels in concrete, so the impermeability of silica fume concrete is very strong, the permeability of concrete increases with the increase of water-binder ratio, this is because the compactness of water-cement is relatively poorer than that of concrete.
c) Chemical resistance: Mixing Bubuk Silika into concrete can reduce the content of Ca (OH) 2 and increase the compactness of concrete. It can effectively improve the corrosion ability of weak acid. However, it cannot be used in strong acid or high-depth weak acid. CSH decomposes in acid. In addition, it is also resistant to salt corrosion, especially to chlorides and sulfates. The reason why it is resistant to salt corrosion is that the silica fume concrete is denser and the pore structure is improved, thereby reducing The transmission speed of harmful ions is reduced and the formation of soluble Ca (OH) 2 and ettringite (3CaO·Al2O3·3CaSO4 ·32H2) is reduced, and the result of increasing hydrated calcium silicate crystals.