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What! How do engineers specify the CJ requirements, other than "intentionally roughened"? Even with reinforcement tying two separate pours together I would still expect the surface to be roughened, not smooth.

Hi, NZS has quite a clear definition on the requirements of a construction joint. Typically a Type B construction joints (where it is necessary to develop shear friction across the joint) are specified and NZS 3109 has clear definition of what a type B CJ is, and how the contractor is to create...

Thanks for the responses. Assuming a fan-shape strut would remove the requirements for bursting reinforcement (according to AS 3600). However there is no guidance on when to apply a fan-shape vs bottle shape. The commentary to AS3600 notes: "If the stress field along the strut axis can...

In designing a pile cap using strut and tie method, AS3600 notes the compression strut area, Ac, as the ‘smallest cross-sectional area of the concrete strut at any point along its length and measured normal to the line of action of the strut’ (cl.7.2.3). It is also shown in Figure 7.2.4(A) that...