Relationship Between the Microstructure and Strength of Cement Paste

2 Relationship Between the Microstructure and Strength of Cement Paste 

The types of bonds which can occur in cement paste have been analysed by numerous authors [28-32], There is a common opinion that two types of bonds can be consider the ionic-atomic bonds, acting only on a very small distance and the van der Waals forces. Initially a significance was attributed to the interlocking of needle-like, fibrous C-S-H particles. However, this was rejected because in the hardened, old pastes there is a very low content of fibrous components. The occmrence of these elongated needle-like C-S-H forms has been questioned recently (see Sect. 3.2.3). 

The formation of bonds between the C-S-H ciystalhtes was the subject of numerous discussions. Rebinder et al. [28] presented the hypothesis that the formation of these bonds (the intergrowths) in the contacts of crystalhtes is controlled by the 

The particular concepts of stmcture models of cement paste are based mainly upon the speciQc surface area measurements and the sorption properties of this material, as well as on the smdies of porosity and pore size distribution. 

Water in cement paste, considering the relativity of the base of its quantitative division, can be divided as follows  

---