本文件介绍了测量、搅拌、运输和浇筑主要用于核建筑辐射屏蔽的重质混凝土的推荐方法和程序。还包括水泥、重质骨料、水和外加剂的建议。讨论了重质混凝土的配合比。描述了搅拌设备、模板施工、浇筑程序和固结方法。重点介绍了质量控制、检查和测试，并提供了参考文献清单。本版本304.3R中未讨论预先浇筑的重量级混凝土。该文件的2004年版本涵盖了这一点。

This document presents recommended methods and procedures for measuring, mixing, transporting, and placing heavyweight concretes that are used principally for radiation shielding in nuclear construction. Also covered are recommendations on cement, heavyweight aggregates, water, and admixtures. Mixture proportioning of heavyweight concrete is discussed. Mixing equipment, form construction, placing procedures, and methods of consolidation are described. Quality control, inspection, and testing are emphasized, and a list of references is included. Preplaced heavyweight concrete is not discussed in this version of 304.3R. It is covered in the 2004 version of the document.