Study of radon emanation from polymer-modified cementitious materials

Burke, Anthony; Stancato, Augusto Cesare; Paulon, Vladimir Antonio; Guedes, S.; Hadler, J.C.

doi:10.1016/s0360-1323(03)00111-2

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…The study of radon diffusion coefficient for polymer, plastic and polyesters was carried out by various investigators [14][15][16][17][18][19]. While the study on granite, sandstone, limestone and concrete was done by Keller et al [15], the effect on radon emanation by polymer modified coating on cementitious materials was carried out by Burke et al [16] and reported decrease in emanation rates with reduced porosity. The radon diffusion coefficient measured by them varies 10 -6 -10 -12 m 2 /s orders of magnitude.…”

Section: Introductionmentioning

confidence: 97%

“…The determination of diffusion coefficient based on either the steady-state measurement of radon concentration in two containers (source chamber and receiver chamber) separated by test specimen or by simultaneous measurement of time-varying radon concentrations on both sides of the test material in two chambers were studied by many researchers [11][12][13]. The study of radon diffusion coefficient for polymer, plastic and polyesters was carried out by various investigators [14][15][16][17][18][19]. While the study on granite, sandstone, limestone and concrete was done by Keller et al [15], the effect on radon emanation by polymer modified coating on cementitious materials was carried out by Burke et al [16] and reported decrease in emanation rates with reduced porosity.…”

Section: Introductionmentioning

confidence: 99%

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Radon diffusion and exhalation from mortar modified with fly ash: waste utilization and benefits in construction

Kumar

Chauhan

2015

J Mater Cycles Waste Manag

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The utilization of fly ash in construction and cement industry increases from last few decades. But the question on utilization of fly ash for construction purpose was raised by many investigators as it causes a source of radioactive gas radon and increase in the gamma dose. In order to optimize the utilization of fly ash in cement with additional benefit of reducing radon diffusion coefficient and exhalation rate were studied. The compressive strength of mortar is the key factor for cement industry, thus it should not be sacrificed for utilization of fly ash. Keeping this in mind, compressive strength, porosity, radon diffusion and exhalation rate study was carried out through the mortar reinforced with the blending of fly ash with cement. The results indicated decrease in effective radon diffusion coefficient from 0.363 9 10 -7 to 0.013 9 10 -7 m 2 /s for fly ash up to 50 % substitution. The addition of fly ash in cement first decreased the radon exhalation rates up to 25 % substitution then increases and similar trends were observed for compressive strength. Thus, the addition of fly ash exerts a positive effect up to a 20-25 % replacement beyond which it may introduce negative effect depending upon the level of substitution.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Radon diffusion and exhalation from mortar modified with fly ash: waste utilization and benefits in construction

Kumar

Chauhan

2015

J Mater Cycles Waste Manag

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“…The radon exhaled from building materials will accumulate in houses, buildings, and workplaces [7][8][9][10]. Radon exhalation rate is crucial in the estimation of radiation risk from various materials [11][12][13][14][15][16][17], and it can be measured by accumulation chamber technique [18]. We proposed that a RAD7 (Durridge Company) based on electrostatic collection method can be used to monitor the changes of radon concentration in the accumulation chamber, and the evolution of radon concentration can be measured with time automatic [19].…”

Section: Introductionmentioning

confidence: 99%

Measuring radon exhalation rate through three cycles

Tan

Xiao

2012

J. Inst.

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This paper proposes that the radon exhalation rate can be calculated through three measurement cycles performed by a radon monitor based on the electrostatic collection method. The first cycle time is 20 min, the measured value in this cycle falls into disuse. The radon concentrations in the next two long cycles can be accurately measured. Because the 218 Po concentration in the internal cell of the RAD7 is only dependent on the radon exhalation rate and the effective decay constant of radon, the radon exhalation can be obtained through two accurately measured values. The two equations that express the measured value in the second and third cycle can't be solved for the variable of radon exhalation rate. However, the numerical root of the radon exhalation rate can be searched. The radon exhalation rates are in good agreement with the reference value (1.48 ± 0.05 Bq•m −2 •s −1 ). This method can be applied to develop and improve instruments for measuring the radon exhalation rate.

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“…A study for uranium mill tailings of Monticello, Utah, United States shows that 98% of harmful factors of uranium mill tailings come from gamma rays and radon emanation [2] . There is a complex nonlinear dynamic process existence in the exhalation and precipitation of radon from uranium mill tailings which is often subject to multiple internal factors and external factors [3][4][5][6][7][8][9] . Internal factors are medium composition [3] , radium content [4] , porosity, particle size [5] , permeability and water content [6] ; external factors are the temperature [7] , pressure [8] , and relative humidity [9] , precipitation and so on.…”

Section: Introductionmentioning

confidence: 99%

Fractal Analysis of Spatial Distribution of Radon Exhalation Rates of Uranium Mill Tailings

Xie

Tan

Chen

et al. 2012

AMR

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A uranium mill tailings, located in Guangdong, was selected for spatial distribution of the radon exhalation rates measured by local static method. The two-dimension surface of radon exhalation rates was established by Surfer using the data of spatial distribution of radon exhalation rates measured at August 14, 2007 to 19 and 21, which was analyzed by fractal method of projective covering. The results show that the two-dimension surface of radon exhalation rates is of fractal structure. The fractal dimension of surface of radon exhalation rates from August 14, 2007 to 19 and 21 are 2.0535, 2.0173, 2.0029, 2.0084, 2.0079, 2.0057 and 2.0034, respectively, which indicates that the complexity of spatial distribution of the radon exhalation rates at 14 and 15 are larger than that of the other days. The phenomenon results from the change of precipitation and temperature, as well as the features of uranium mill tailings, including mineral composition, particle size, radium content, porosity and pore connectivity, etc.

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Study of radon emanation from polymer-modified cementitious materials

Cited by 6 publications

References 3 publications

Radon diffusion and exhalation from mortar modified with fly ash: waste utilization and benefits in construction

Radon diffusion and exhalation from mortar modified with fly ash: waste utilization and benefits in construction

Measuring radon exhalation rate through three cycles

Fractal Analysis of Spatial Distribution of Radon Exhalation Rates of Uranium Mill Tailings

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