ASTM C143/C143M − 12 Standard Test Method for Slump of Hydraulic Cement Concrete

Scope of ASTM C143/C143M − 12 Standard Test Method for Slump of Hydraulic Cement Concrete

1.1 This test method covers determination of slump of hydraulic-cement concrete, both in the laboratory and in the field.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

Significance and Use of ASTM C143/C143M − 12 Standard Test Method for Slump of Hydraulic Cement Concrete

4.1 This test method is intended to provide the user with a procedure to determine slump of plastic hydraulic-cement concretes.

NOTE 1—This test method was originally developed to provide a technique to monitor the consistency of unhardened concrete.

Under laboratory conditions, with strict control of all concrete materials, the slump is generally found to increase proportionally with the water content of a given concrete mixture, and thus to be inversely related to concrete strength.

Under field conditions, however, such a strength relationship is not clearly and consistently shown.

Care should therefore be taken in relating slump results obtained under field conditions to strength.