Cement Hydration Simulation And Algorithm In Cellular Automata Environment

Cement hydration is a very complex process. Computer simulation for cement hydration existing as a part of study of cement hydration, is worthy of studying and predicting the cement performance, and is a focal point of scientific study for cement hydration. CEMHYD3D from NIST is a software package that can construct a three-dimensional computing model to simulate the cement hydration and microstructure evolution process, and is a significant and updated achievement in field of computer simulation for cement hydration.On the basis of careful study and analysis of CEMHYD3D software's source code and guidelines, this thesis elaborates the process about simulation for cement hydration, hydration model program structures, data structures and algorithms, and focus on cellular automata theory's guidance on hydration.Firstly, explaining cement firing process, cement components, hydration mechanism, and hydration reaction equations for key components in cement particle.Secondly, two-dimensional digital information obtained from two -dimensional SEM/X-ray image, such as water-cement ratio, particle size distribution, phase surface area scores, will be used to construct particle's three-dimensional microstructure as parameters.Thirdly, constructing the initial three dimensional cement microstructure on the basis of important corresponding relation that the area of cement score, edge perimeter scores in two-dimensional cement image is respectively equal to the three-dimensional particle respectively in volume fraction, surface area scores in three dimensional structure.Forth, using Cellular Automata as theoretical guide, proposing a new CA model with 26 neighbors on the basis of six neighbors in cellular automata, according to the hydration sequence of dissolution, diffusing and reaction construct hydration rules and algorithm them to simulate the cement hydration process.Fifth, analysis framework of hydration process and its core algorithm based on CEMHYD3D software and each phase of the hydration.The innovation in this thesis lies in that, proposing and using new cellular automata model with 26 neighbors to simulate the hydration process, giving hydration dissolved rules algorithm and diffused rules algorithm. For more complex reaction rules, simulating growth of single-phase structure crystal will be given, using Matlab as visualization tool to show crystal growth process, and comparing the simulation results with existed mature two-dimensional crystal growth model to verify its correctness, providing more intuitive proof for further research.