Ketahanan konkrit merangkumi ketahanan fros konkrit, ketelapan, ketahanan kimia, ketahanan kakisan keluli dan ketahanan hakisan. Saya hanya akan membincangkan ketahanan fros, ketelapan dan ketahanan kimia terhadap konkrit. Kesan hakisan.
a) Rintangan fros: Apabila jumlahSerbuk Silikakecil, ketahanan fros konkrit asap silika pada dasarnya sama dengan konkrit biasa. Apabila jumlah serbuk silika melebihi 15%, daya tahan frosnya kurang. Melalui sebilangan besar ujian, pandangan ini pada dasarnya telah disahkan. Sebab utama ialah apabila asap silika melebihi 15%, pengembangan konkrit meningkat, modulus elastik dinamik relatif menurun, dan kekuatan mampatan turun dengan mendadak. Dari perspektif ciri dalaman konkrit, Luas permukaan tertentu kecil, dan pekali jaraknya besar.
b) Impermeability: Because Serbuk 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 Serbuk 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.