Impact From Fly Ash as Additive to Concrete on the Radiation Exposure in Dwellings

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Govert de With
Keyword(s):  
Fly Ash ◽  
Radiation Dose ◽  
Radiation Exposure ◽  
Bulk Material ◽  
Cementitious Material ◽  
External Radiation ◽  
Supplementary Cementitious Material ◽  
Concrete Mixtures ◽  
Total Radiation Dose ◽  
The Impact

Fly ash is widely used as a supplementary cementitious material in the production of cement and concrete, and improves durability and strength of the concrete. However, as for all materials of mineral origin, fly ash is a source for natural radioactivity; hence, its need for responsible use. The aim of this study is to investigate the radiation impact from fly ash as an additive to concrete compared against concrete without fly ash. For this purpose, eight concrete mixtures are experimentally tested, followed by a computation of the radiation dose when used as bulk material in building constructions. The results demonstrate an increase in the total radiation dose from around 0.8 mSv with no fly ash up to 0.92 mSv when fly ash is used. The increase mostly comes from external radiation, while the radon exhalation factor is reduced and sometimes even reduces the radon dose despite the higher radium content. The work has demonstrated that the impact from fly ash on the radiation exposure is limited when applied as a supplementary cementitious material. At the same time, fly ash provides real benefits to the quality and durability of the concrete. For this reason, exemption strategies for such applications should be developed.

scholarly journals Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Martin Keppert ◽  
Jamal Akhter Siddique ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Fly Ash ◽  
Waste Incineration ◽  
Cementitious Material ◽  
Mswi Fly Ash ◽  
Supplementary Cementitious Material ◽  
Before And After ◽  
Heavy Metal Immobilization ◽  
Common Technique ◽  
Strength And Durability ◽  
The Impact

Municipal solid waste incineration (MSWI) is a common technique in treatment of domestic waste. This technique annually produces approximately 25 Mt solid residues (i.e., bottom and fly ash) worldwide which is also a major issue in current research. In this research we are concerned with reusing the fly ash (FA) as supplementary cementitious material (SCM) in concrete. Such application solves the problem with heavy metal immobilization as well. To remove the high content of undesired soluble salts, number of washing treatments has been applied. Chemical composition of FA has been examined before and after treatments. The impact of cement substitution by FA in concrete was evaluated by measurement of its compressive strength and durability.

IMPACT OF THE TABLE HEIGHT AND THE OPERATOR’S HEIGHT ON THE LEVEL OF RADIATION DELIVERED TO INTERVENTIONAL CARDIOLOGISTS

2019 ◽  
Vol 187 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Laurent Faroux ◽  
Thierry Blanpain ◽  
Anthony Fernandez ◽  
Pierre Nazeyrollas ◽  
Sophie Tassan-Mangina ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Radiation Dose ◽  
Radiation Exposure ◽  
Primary Endpoint ◽  
Health Professionals ◽  
Maximum Distance ◽  
X Ray ◽  
Coronary Interventions ◽  
Coronary Procedures ◽  
The Impact

ABSTRACT Interventional cardiologists count among the health professionals that are most exposed to ionising radiation. To minimise exposure, it is recommended that the patient be placed at the maximum distance possible from the X-ray source, but this recommendation has not been clinically validated. We aimed to investigate the impact of the average table height on the level of radiation delivered to cardiologists performing coronary interventions. The population for analysis included all invasive coronary procedures performed in our centre from March to June 2017. The primary endpoint was operator radiation exposure, as assessed using personal electronic dosimeters located on the operator’s left arm. In total, 225 invasive coronary procedures were analysed. When the average table height was 1126 mm or more, the operators received a radiation dose that was, on average, 53% lower than when the table was lower than 1126 mm. This reduction remained significant by multivariate analysis adjusted for the operator.

scholarly journals Radiation Dose Reduction during Radial Cardiac Catheterization: Evaluation of a Dedicated Radial Angiography Absorption Shielding Drape

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Andrew Ertel ◽  
Jeffrey Nadelson ◽  
Adhir R. Shroff ◽  
Ranya Sweis ◽  
Dean Ferrera ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Radiation Exposure ◽  
Cardiac Catheterization ◽  
Patient Comfort ◽  
Bleeding Complications ◽  
Catheterization Laboratory ◽  
Cardiac Catheterization Laboratory ◽  
Radiation Scatter ◽  
The Right ◽  
The Impact

Objectives. Radiation scatter protection shield drapes have been designed with the goal of decreasing radiation dose to the operators during transfemoral catheterization. We sought to investigate the impact on operator radiation exposure of various shielding drapes specifically designed for the radial approach. Background. Radial access for cardiac catheterization has increased due to improved patient comfort and decreased bleeding complications. There are concerns for increased radiation exposure to patients and operators. Methods. Radiation doses to a simulated operator were measured with a RadCal Dosimeter in the cardiac catheterization laboratory. The mock patient was a 97.5 kg fission product phantom. Three lead-free drape designs were studied. The drapes were placed just proximal to the right wrist and extended medially to phantom’s trunk. Simulated diagnostic coronary angiography included 6 minutes of fluoroscopy time and 32 seconds of cineangiography time at 4 standard angulated views (8 s each), both 15 frames/s. ANOVA with Bonferroni correction was used for statistical analysis. Results. All drape designs led to substantial reductions in operator radiation exposure compared to control (P<0.0001). The greatest decrease in radiation exposure (72%) was with the L-shaped design. Conclusions. Dedicated radial shielding drapes decrease radiation exposure to the operator by up to 72% during simulated cardiac catheterization.

scholarly journals Towards the sustainable use of granite powder waste for manufacturing of cementitious composites

2020 ◽  
Vol 322 ◽  
pp. 01005
Author(s):  
Adrian Chajec
Keyword(s):  
Sustainable Use ◽  
Cementitious Material ◽  
Cementitious Composites ◽  
Cement Composites ◽  
Research Gaps ◽  
Supplementary Cementitious Material ◽  
Current State ◽  
Granite Powder ◽  
The Impact ◽  
Harmful Effects

The article is devoted to the description of the current state of knowledge about the possibilities of sustainable use of granite powder waste for manufacturing of cementitious composites. Granite powder waste is waste material resulting from the treatment of granite stone. In dry form, it is harmful to the environment and causes its degradation. One way to reduce its harmful effects is to use it for the sustainable production of cement composites and to use it as supplementary cementitious material (SCM). The results of researches carried out so far related to the impact of granite powder waste on the properties of fresh and hardened cementitious mixes are described. These results were compared and research gaps related to these studies were indicated. In summary, conclusions have been pointed out that indicate that granite powder waste can potentially be used as supplementary cementitious material, but comprehensive, comprehensive research related to this additive should also be carried out.

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