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Radon diffusion coefficients for residential concretes

V C Rogers¹, K K Nielson, R B Holt

¹Rogers and Associates Engineering Corporation, Salt Lake City, UT 84110-0330.

|September 1, 1994

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Radon gas diffuses through concrete, impacting indoor air quality. Diffusion rates depend on concrete

Area of Science:

Environmental Science
Building Materials Science
Radiological Protection

Background:

Radon gas entry into homes is a significant indoor air quality concern.
Concrete is a common building material, and its porous nature allows for gas diffusion.
Understanding radon diffusion through concrete is crucial for mitigating indoor radon exposure.

Purpose of the Study:

To quantify radon diffusion coefficients in residential concrete.
To investigate the relationship between concrete properties and radon diffusion.
To provide data for improved radon entry models in buildings.

Main Methods:

Measured radon diffusion coefficients in various residential concrete samples.
Analyzed the correlation between diffusion coefficients and concrete characteristics.

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Employed least-squares regression to model the relationship with concrete density.

Main Results:

Radon diffusion coefficients ranged from 2.1 x 10(-8) to 5.2 x 10(-7) m2 s-1.
Diffusion coefficients increased with higher water-cement ratios.
Diffusion coefficients decreased with increased concrete density (r = -0.73).

Conclusions:

Concrete's pore structure significantly influences radon gas diffusion.
Water-cement ratio and density are key factors affecting radon permeability in concrete.
Findings support the need to consider concrete properties in radon mitigation strategies.