ASTM C1634-20 PDF Download

The ASTM C1634-20 standard provides requirements for solid, dry-cast concrete facing brick and other concrete masonry facing units intended for use in both interior and exterior construction projects. These units are made from materials such as portland cement, water, and suitable mineral aggregates, with the option to include other materials.

The specification classifies concrete facing bricks into different density classifications, namely lightweight, medium weight, or normal weight. The physical properties of the units, such as oven-dry density, maximum water absorption, and minimum net area compressive strength, are tested and must conform to the specified requirements based on their density classification.

The standard also includes informative notes and footnotes that provide additional explanatory material. These notes and footnotes, excluding those in tables and figures, are not considered as requirements of the standard. It is important to note that concrete facing brick and other concrete masonry facing units covered by this specification can be made from lightweight or normal weight aggregates, or a combination of both.

Furthermore, the specification acknowledges that specific features may be desired for these concrete facing units, such as density classification, high compressive strength, surface textures, finish, color, fire resistance, insulation, acoustical properties, or other special features. In such cases, the purchaser should specify these properties separately, and suppliers should be consulted regarding the availability of units with the desired features.