[en] Purpose: To provide a simple radiation shielding method for the shielding wall of a building processing radioactive substances through which pipe lines are passed. Constitution: A concrete shielding block having insertion holes for pipe lines are formed, to which engaging recesses and engaging ridges are provided for the positioning of the pipe line insertion holes. Then, the concrete shielding block is inserted to a sleeve embedded in the shielding wall of the building and shielding plugs are inserted. (Kawakami, Y.)

[en] The form-fitting brick allows to form simple geometric figures like straight lines, angles, polygons and crosses and to cover surfaces homogeneously without making use of another shape of brick. The brick has got superficies consisting of plane rectangular quadrangles part of which showing a concave connecting contour for the adjoining brick which has got a convex connecting contour. According to the invention both external ends of the concave connecting contours are shaped as reinforcing ribs. The bricks may be manufactured from concrete. The description mentions some variants. (UWI)

[en] Specifications are set forth for natural mineral aggregates, consisting of materials such as barite, magnetite, ilmenite, limonite, and serpentine and synthetic aggregates such as ferrophosphorous for use in radiation-shielding concretes. Sizing, composition, specific gravity, and fixed water content are all covered in the standards of specifications

[en] The possibility of using numerical method for the analysis of reinforced concrete structures is limited by the incomplete knowledge of the behavior of concrete under multiaxial stress states. While many experimental and theorectical investigations have been and are presently carried out to clarify this problem, an attempt is being made here to use the available experimental data to achieve an ultimate strength criterion apt to be used in an analytical model. (orig.)

No abstract available

[en] Proceeding from a general and theoretical chapter the textbook deals with individual categories of inorganic non-metallic materials such as mineralic materials, glass and glass ceramics, non-oxidic materials, concrete-like materials, fibrous materials, and composite materials. From the point of view of materials science the presentation of the subject considers in all cases the connection between chamical composition and stucture, physical properties, and application behaviour. 237 figures, 72 tables, and 173 references are included

[en] The velocities of ultrasonic waves in a uniaxially compressed concrete are influenced by microcracking. The experimental results are commented and a model of propagation in a randomly microcracked medium is built. The model shows a high anisotropy of propagation when all cracks have the same orientation

[en] A procedure for the manufacture of concrete vessels with an inner lining to contain hazardous materials is described. The procedure is designed to avoid enclosed air pockets or faults in the concrete like gravel lumps. Protruding reinforcement parts are fitted with rubber buffers to protect the vessel from being damaged in case of accidents (falling from a crane) or rolling away. Also thin-walled vessels can be produced by this method

[en] Following a description of the containments for different types of nuclear reactors, the report summarises the present position concerning national Codes. Design is considered based on limit state principles, and various aspects of design, including the use of single and double barrier containments, are described. Constructional details, such as the placing of tendons, slipforming and prestressing operations are dealt with in a practical manner. The report contains special chapters on testing and on inspection of serviceability. (author)

[en] When the calculated results of the concrete decomposition model are compared with experiments the concrete decomposition enthalpy is found to be in good agreement for silicaceous concrete. For lime-stone concrete, however, a considerable discrepancy exists which needs further investigation. The evaluation of thermite experiments (topic 06.01.12) showed that the transient erosion of a horizontal concrete surface and the time dependent surface temperature of the melt agrees in tendency with the WECHSL calculations. The starting time of solidification processes as well as the maximum erosion depth also agree in order of magnitude with the experimental observations. The results of the extended film model for the heat transfer to inclined walls was checked with model experiments (subliming dry ice slabs in water). (orig.)