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WebHistorically, Concrete Society Technical Report 11 (CSTR 11) was used in the UK to interpret core strength results, but it was superseded in part by BS EN 13791 and BS 6089. … Weba minimum strength class of C25/30 is set, with a minimum cement or combination content of 320kg/m 3 at a maximum w/c ratio of 0.55 irrespective of cement type. Highest … Web18 May 2024 · 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. form missing cartridge