Abstract: To improve the action mechanism of water glass on the hydration of slag-based cementitious materials (SCM), the influence of water glass modulus on the compressive strength and the hydration products of SCM was investigated by means of mechanical test, X-ray diffraction and thermogravimetric analyses. Meanwhile, the correlations between the kinetic parameters of crystallization nucleation and crystal growth (NG), phase boundary reaction (I) and diffusion (D) process of SCM and the water glass modulus were discussed using isothermal calorimetry and the Krstulovic-Dabic kinetic model. The results showed that the main hydration products of SCM were calcium (aluminum) silicate hydrate gels. The amount of hydration products decreased with the increase of water glass modulus in the range of 0.7—2.5. Under the condition of low water glass modulus (Ms=0.7), the formation of a large amounts of calcium (aluminum) silicate hydrate gels with low polymerization degree resulted in the reduction in compressive strength. Kinetic studies indicated that the hydration process of SCM conformed to the Krstulovic-Dabic kinetic model that the control process was shown as NG→I→D. The action mechanism of water glass modulus on the hydration of SCM lies in its effect on the reaction rate constants of NG, I and D processes, which decreased with the increase of water glass modulus, leading to the reduction in hydration reaction rate of SCM.
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2020, Vol. 34 
