The water proton spin-lattice relaxation time and recovery function of exchangeable water was measured in tricalcium silicate (C3S) gels. The measurements were carried out as a function of the hydration time and grain size. Results show that the hydration of (C3S) is a two stage process. A model is developped.
Two samples of ordinary Portland cement, one consisting of dry powder and the other of hydrated paste 28 days old, were bombarded witb protons, resulting in proton-induced x-ray emission (PIXE). The x-ray yield was measured as a function of the exit angle and the differences between the two samples were interpreted by the hypothesis that the pores of the hydrated cement gel form a fractal. The fractal dimension that was calculated is in good agreement with the values found by small-angle neutron scattering and nuclear magnetic resonance.
In this paper we describe a novel concept for classification of complex parametric geometry based on the concept of the Divider Set. The Divider Set is an alternative concept to maximal disks, Voronoi sets and cut loci. The Divider Set is based on a formal definition relating to topology and differential geometry. In this paper firstly we discuss the formal definition of the Divider Set for complex 3-dimensional geometry. This is then followed by the introduction of a computationally feasible algorithm for com
The behaviour of the soliton density is examined, in the chaotic phase of some incommensurate systems. According to many authors, in this region, very close to the Lock-in transition where the Landau approximation is not valid, a devil's staircase exists . In this letter we try to explain the critical behaviour of the soliton density in the above region with the help of the fractal structure of the devil's staircase. Comparison between theory and experimental data favours this model.
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