The effect of magnesium on the alite phase structural stability and its hydration process

In our study we have evaluated the effect of magnesium (mg) insertion on the stability and the hydration process of tri-calcium silicate which is considered as the main phase of portland cement clinker. we have concluded that the substitution of calcium by magnesium in the silicate phase involves several phenomena,such as a weak increase of portlandite (ca(oh)2) rate,a diminution of the ca/si ratio and an augmentation of the average silicate chain lengths. in addition,we have concluded that these aspects are due only to the dopage of mg into c3s and not to the alteration of its hydration mechanism. then,we confirmed that the insertion of mg is beneficial to maintain the stability of c3s. at first,we synthesized a pure and doped product with mg and then studied the effect of mg insertion on the stability and the hydration of c3s. many investigation techniques have been used such as: x-ray diffraction xrd,thermogravimetric analysis tga,differential scanning calorimetry dsc,nuclear magnetic resonance29si mas-nmr and electron probe micro-analyzer (epma). © 2017,university of mohammed premier oujda morocco.