摘要
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 CO2 while Ca（OH）2 reacted with CO2.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.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2009年第6期1225-1229,共5页
Bulletin of the Chinese Ceramic Society
