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Radiation barite concrete mix design and its properties

Author: ChenQingJi
Tutor: HuXiaoBo；LiShiQiu
School: Central South University
Course: Civil Engineering Materials
Keywords: Barite concrete radiation Mix Performance Construction Engineering application
CLC: TU528
Type: Master's thesis
Year: 2010
Downloads: 200
Quote: 3
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Abstract

In addition to radiation barite concrete building structure should meet the general features, more important is to have a protective function rays. With the development of nuclear technology and long-term nuclear power development plan and national implementation of radiation protection barite concrete applications will become increasingly widespread. In this paper, experimental study and theoretical analysis of the combination of methods, materials and their properties, radiation barite concrete mix design, performance and construction technology and process parameters for a more systematic study of the characteristics for its easy segregation proposed in relative sedimentation coefficient as an anti-segregation evaluation. The results showed that: (1) should adopt concrete barite radiation density, combined with more water, lower heat of hydration of cement; Barite aggregate apparent density should be selected to meet the apparent density of the concrete requirements, coarse and fine aggregate grading should be continuous gradation, gradation poor, should be adjusted. (2) apparent density of barite radiation concrete and aggregate increase the apparent density between linearly; density decreased with the increase of water. Ordinary concrete mix designs, barite concrete should first select the appropriate radiation barite raw materials, their water consumption choices can refer to ordinary concrete water consumption choices to achieve the same slump, the water selectivity ordinary concrete small 5kg/m3; sand rate selection in ordinary concrete sand ratio, based on the increase of 3% -5%. Incorporation of ordinary sand and gravel aggregate, reducing the apparent density of barite concrete; incorporation ordinary coarse aggregate can increase the strength of concrete, while the incorporation of ordinary fine aggregate, concrete strength did not change significantly. (3) can be used to evaluate the relative sedimentation coefficient of barite concrete aggregate relative settlement radiation and anti-segregation capabilities, relative sedimentation coefficient, the greater the ability of anti-segregation worse. (4) Radiation barite concrete compressive strength and water-cement ratio in line Bolomy formula, gray water ratio and strength with good linear correlation, the correlation analysis results αa = 0.50, αb = 0.35; its axis anti- compressive strength of the cube compressive strength 75% -80%; splitting tensile strength of cube compressive strength of 6% -8%; elastic modulus ratio of ordinary concrete with strength class small. (5) barite concrete radiation at 100 ℃, the internal moisture loss serious, and loss of strength is small; its linear expansion coefficient bigger than ordinary concrete, at a temperature below 80 ℃, linear expansion coefficient may be taken as (1.6- 2.0) × 10-5 / ℃. (6) cellulose thickener barite radiation can significantly improve the workability of concrete to prevent segregation and bleeding, but it will reduce the capacity and strength of concrete radiation, the optimum dosage of 0.05%. (7) Radiation barite concrete construction needs to grasp its apparent density, easy segregation characteristics, establish a complete construction program, to ensure the quality of concrete construction.

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