Part II of our video series taken from “The Best of VI in ‘25” welcomes Mike Niemet of Jacobs who presents on “Vapor Diffusion Through Concrete.” Here, he discusses the real-world study of chemical vapor intrusion through a concrete slab. While common thought holds that advection is the primary mode of chemical vapor intrusion, Mike's analysis demonstrates that the diffusive flow of chemical vapor through concrete is another factor to consider.
Key points:
- Primary VI mechanisms: Advection and diffusion AND diffusion through microscopic pores of a slab.
- Path sampler acts like a “band-aid” and measures flux through the slab
- Frick’s first law
- J & E model can also be used for concrete
- Warehouse building illustrates how theory was put into practice