ASTM C796/C796M − 12 Standard Test Method for Foaming Agents for Use in Producing Cellular Concrete Using Preformed Foam

ASTM C796/C796M − 12 Standard Test Method for Foaming Agents for Use in Producing Cellular Concrete Using Preformed Foam

Scope
1.1 This test method furnishes a way of measuring, in the laboratory, the performance of a foaming chemical to be used in producing foam (air cells) for making cellular concrete.

1.2 This test method includes the following:

1.2.1 Manufacture of laboratory quantities of cellular concrete.

1.2.2 Determination of the air content of the freshly prepared cellular concrete and of the hardened concrete after handling in conventional machinery.

1.2.3 Determination of the following properties of the hardened concrete: compressive strength, tensile splitting strength, density, and water absorption.

It may not be necessary to study all of the above properties in all cases, depending on the proposed use of the material.

ASTM C796/C796M − 12 Standard Test Method for Foaming Agents for Use in Producing Cellular Concrete Using Preformed Foam

Terminology
3.1 Definitions:
3.1.1 cellular concrete—a lightweight product consisting of portland cement, cement-silica, cement-pozzolan, limepozzolan, or lime-silica pastes, or pastes containing blends of these ingredients and having a homogeneous void or cell structure, attained with gas-forming chemicals or foaming agents (for cellular concretes containing binder ingredients other than, or in addition to portland cement, autoclave curing is usually employed).

In cellular concrete the density control is achieved by substituting macroscopic air cells for all or part of the fine aggregate.

Normal-weight coarse aggregate is usually not used but lightweight aggregates, both fine and coarse, are often utilized in cellular concrete.