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Radon diffusion coefficients for aged residential concretes

V C Rogers1, K K Nielson, R B Holt

  • 1Rogers & Associates Engineering Corporation, Salt Lake City, UT 84110-0330, USA.

Health Physics
|June 1, 1995
PubMed
Summary
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Older Florida residential concrete exhibits higher radon gas diffusion. Measurements show pore diffusion coefficients are significantly greater in aged concrete compared to new materials, impacting indoor radon levels.

Area of Science:

  • Environmental Science
  • Geology
  • Building Materials Science

Background:

  • Radon gas intrusion into homes is a significant public health concern.
  • Concrete is a primary building material, and its properties influence radon transport.
  • Understanding radon diffusion in aged concrete is crucial for indoor air quality assessments.

Purpose of the Study:

  • To measure the radon gas pore diffusion coefficient in aged residential concrete from Florida.
  • To compare diffusion coefficients in aged concrete with those previously reported for new concrete.

Main Methods:

  • Collected concrete samples from residential buildings aged 12 to 45 years in Florida.
  • Measured radon gas pore diffusion coefficients using established laboratory techniques.

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Main Results:

  • Radon diffusion coefficients ranged from 1.5 x 10(-7) m2 s-1 to 5.5 x 10(-7) m2 s-1.
  • The average diffusion coefficient was approximately 1.6 times higher than reported values for new Florida residential concrete.

Conclusions:

  • Aged residential concrete demonstrates increased radon gas permeability.
  • The findings suggest that older homes may have a higher potential for radon gas intrusion.
  • Further research into the aging mechanisms affecting concrete's radon diffusion properties is warranted.