介绍了硅酸盐水泥混凝土的碳化反应和碳化过程,分析了Ca(OH)_2与水化硅酸钙(C-S-H)的碳化作用.Ca(OH)_2发生碳化反应的同时,C-S-H也会发生碳化反应;Ca(OH)_2的碳化产物是方解石,而C-S-H碳化后会转变成无定形硅胶,可能形成稳定性差、结晶度差的球霰石、文石,其分解温度低于方解石的分解温度;C/S低、结晶度差的C-S-H凝胶易于碳化;水泥浆体孔隙溶液中的碱含量越高,碳化速度越快,深度越大.
Carbonation reaction and carbonation process of portland cement concrete were introduced,and carbonation of Ca(OH)_2 and calcium silicate hydrated(C-S-H)was analyzed. The analysis showed: C-S-H also reacted with CO_2 while Ca(OH)_2 reacted with CO_2. The main carbonated product of Ca(OH)_2 was calcite and that of C-S-H was amorphous silica gel, and maybe unstable, poorly crystallized aragonite and vaterite were formed. Decomposition temperature of aragonite and vaterite was lower than calcite. C-S-H with low C/S and poor crystallinity was prone to carbonation; the rate of carbonation became higher with higher alkali content.
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