FUNDAMENTAL STUDY ON CHEMICAL COMPOSITION AND PHYSICAL PROPERTIES

Abstract

  C-S-H is a dominant hydration product of cementitious materials. Therefore, its composition and properties affect the properties of concrete. However, the composition and the properties of C-S-H, and the relation between both have not been completely clarified.
  The purpose of this study is to estimate chemical composition and physical properties of C-S-H, such as density and specific surface area. Chemical compositions of C-S-H were calculated from the mass balance between starting materials and hydration products. The density and specific surface area of synthesized C-S-H and C-S-H generated from various cementitious materials were measured.
  From the experimental results, H/S ratio of C-S-H is in proportional to C/S ratio independent of kind of binder and mix proportion. The density and specific surface area are affected by C/S ratio, and linear relationships between C/S ratio and these physical properties are recognized respectively independent of kind of binder and mix proportion.