Abstract
C-S-H is a dominant hydration product of hardened cement materials. Thus, changes of composition of C-S-H have a huge effect on the physical-chemical properties of that. These properties are diffusivity of ion in concrete and shrinkage, and all that. Therefore, it is important to figure out the specific surface area of C-S-H accurately.
The purpose of this study is to figure out the specific surface area which is physical properties of C-S-H. Specific surface area of C-S-H generated from alite was checked up already in our laboratory. So we measured the specific surface area of C-S-H generated from belite, and compared with the specific surface area of C-S-H generated from alite. As the result, it was found that composition of each C-S-H generated from alite and belite were about the same. Furthermore, both specific surface area were in the same range.
Next, we measured amount of gel water at relative humidity 11％ to examine the experimental results. The volume of gel pore can be calculated from the amount of gel water. As the results, the amount of gel water of C-S-H generated from alite and that of C-S-H generated from belite were the same. Therefore, validity of experiment results of the specific surface area was recognized. Finally, the specific surface area of C-S-H is not affected by clinker minerals.
