Anisotropy of Concrete Strength

Abstract

Results obtained by numerous researchers concerning concrete strength anisotropy are analyzed. In some cases, the researchers have found that the compressive strength of specimens loaded at a right angle to a direction of concrete placing, f′c, is greater than for those loaded parallel to the above direction, f″c; in other cases, it is lower. This fact has been elucidated. In the cases where anisotropy is caused by the “internal” mix segregation, we come across f′c/f″c > 1; when the cause is in the “external” mix segregation, the result is f′c/f″c < 1. Given are recommendations for taking into account such anisotropy in core testing.

Effect of Compaction during Casting on Anisotropic Compressive Strength of Baked Clay

“…The research suggests that concrete is anisotropic in compressive strength. In general, compressive strength of concrete specimen tested in a direction parallel to casting layers is more than that tested in a direction perpendicular to casting layers [16].…”

Redefining Existing Concrete Compressive Strength Acceptance Standard in Iran Concrete Code (ABA), by Experimental Data

“…On the other hand the difference in experimental conditions and devises cause significant differences in concrete strength. Despite the relevance and the potential impact on current practices for strength assessment of existing structures, the subject of compressive strength has received little attention in the literature [1,[10][11][12][13][14][15][16][17].…”

Need to Identify Parameters of Concrete in the Weakest Zone of the Industrial Floor

“…This problem is mentioned in EN-13791 [6] standard in which the opinion was expressed that concrete strength in the upper cross-section can be lower than in the bottom one by as much as 25%. The possibility that this problem may appear was highlighted also by researchers, among others in [7,8]. However, this difference was determined for zones located at the distance of approx.…”