Effect of sodium tripolyphosphate on the hydration process,ion concentration and supersaturation degree in liquid phase,and crystal morphology of building gypsum was systemically investigated.

By testing hydration rate and hydration temperature at different times,the effect of the retarders on the hydration process of calcined gypsum was studied,and by analyzing morphology and pore structure,the effect of the retarders on the microstructure of gypsum was also studied.

The influence of sodium sulfate on the anhydrite hydration process and the crystal morphology of its dihydrate products were studied by the determination of the hydration rate, hydration temperature and the ion concentration in liquid phase, in combina-tion with the investigation of the microstructure of the hardened anhydrite paste.

This paper introduces, by improved mutation probability in evolutionary programming, raising speed of evolutionary computation.

An approach combining genetic algorithms with evolutionary programming is discussed, which can deal with the constrained conditions easily and obtain the global optimal solution.

It is shown by analysis of evolutionary programming algorithm and experiments of it in the path planning of robots that saving the fittest in every generation of evolutionary programming algorithm may be the source of prematurity convergence.

Mutation Influence Analysis of GA Optimization Progress;