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Calcium leaching of cement-based materials induces detrimental effects on diffusion properties related to long-term durability. This paper investigates the effect of calcium leaching on the chloride diffusivity of hydrated tricalcium silicate (C3S) pastes. Different concentrations of ammonium nitrate solutions were used to accelerate the calcium leaching of C3S pastes. The degree of alternation of C3S pastes was characterized by Ca/Si. The chloride diffusivity of the leached C3S pastes was obtained by the steady-state electro-migration test. Results show that the chloride diffusivity of the leached C3S pastes increases with the increasing degree of alteration. Compared with the sound C3S pastes, the diffusivity of the leached C3S pastes is increased 1.8-3.6 times depending on the degree of alteration.

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Aiming at the problems of location and time limitations arising from the field visits in life, and then taking Changchun Institute of Technology as an example, a virtual campus roaming system based on Unity3D was developed to solve the problem of poor environmental simulation of traditional inspection methods. The system can improve the visual tension and expressiveness of users visiting the campus online, so that we can facilitate school publicity and promotion. First of all, the system uses 3DMax to accurately model the campus site, and then uses Unity to design and implement the functions, so that the system has the characteristics of high presence and strong interaction, thereby improving the user experience.