Why does concrete breakout fail?

Breakout failure is influenced by the tensile and compressive strength of the concrete, the variability of the concrete strength at early age, and the possible additional loads imposed in stripping the concrete from the form and dynamic effects during handling. Background Early-age concrete tensile versus compressive strength

What is tension concrete breakout?

Tension concrete breakout assumes a failure forming a concrete cone based on a prism angle of 35 degrees. This method predicts the strength of a group of anchors by using a basic equation for a single anchor Nb, and multiplied by factors that account for the number of anchors, edge distance, spacing, eccentricity, etc. per ACI 17.6.2.

Does precast concrete age affect breakout strength?

In the precast concrete industry, loads for stripping, lifting, and handling are applied before concrete reaches full maturity. There is little research on the effects of early concrete age on breakout strength as opposed to 28-day low-strength concrete.

What is the break out capacity of a concrete insert?

Regardless, the true break- out capacity of an insert is based on the tensile strength of the concrete. Therefore, if unexpected breakout failures occur, the loads may be higher than assumed, the insert may have a more complex interaction, or the mixture proportion may have a lower-than-average tensile-to- compressive strength ratio.