The broad band in the region of 3,438 and 3,643 cm can be attributed to Ca(OH),. Similar results were also reported by Lecomte et al. (2006), who synthesized portland cement by mixing portland clinker CEMI (clinker+fly ash+ground-granulated blast furnace slag) and saw a sharp band at 3,640 cm associated with the O-H of portlandite (Ca (OH)2). The Ca(OH)2 from CCR is similar to the product obtained from cement hydration