STUDIES ON HYDRATION OF ALITE-CALCINED KAOLINITE SYSTEM

Abstract

This paper reports the hydration of cementitious materials using synthetic C₃S and calcined kaolinite. A result shows that a pozzolanic reaction occurred from the early hydration stage, and C-S-H and stratlingite were formed as the main hydrates. The silicate chain of the formed C-S-H consisted of Q¹ and Q², and a part of the pairing site （Q²） and the bridging site （Q²） were substituted with four-coordinated Al. The bridging site （Q²） was also substituted with 6-coordinated Al. Furthermore, structural analysis of the stratlingite formed in this system showed that crystallization proceeds by the formation of an interlayer in addition to the main layer of stratlingite and that the growth of the interlayer increases in the order of Q² connected to Al and Q² not connected to Al.