A Program to Test Cements for Variations in Strength Producing Properties


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Title: A Program to Test Cements for Variations in Strength Producing Properties

Author(s): Richard H. Campbell

Publication: Journal Proceedings

Volume: 65

Issue: 4

Appears on pages(s): 266-275

Keywords: chemical analysis;compressive strength;cubes;fineness;mortars (materials); portland cements;quality control;testing.

Date: 4/1/1968

Five brands of cement produced in Southern California were sampled and tested monthly by a ready mixed concrete producer. The compressive strength potential of the cements was checked by using a cube test which used a more realistic cement content and a constant water content of 65 percent. The results of 410 sets of cubes, chemical analysis, and fineness determinations are reported for a 5 year period. A sample of a blended control cement was included each month to check the workmanship of the laboratory conduct-ing the tests. An analysis of the variations in reported strength of the controls revealed a pattern. It was felt that this pattern was caused by environmental influences of the laboratory and contributed to a portion of the variations in the cements being tested.