Concreto y Aceros — Crisis Estructural

Express simulation 858 (UNAD ECACEN, bilingual). A 12-storey marine-coastal tower in Puerto Colombia returned a 28-day cylinder break of 18.4 MPa on a 28 MPa specification. Teams play the resident engineer / QC lab / procurement triad across four rounds: diagnose the cylinder result, choose between demolish / re-rate / strengthen, lock the steel certification (NTC 2289 vs ASTM A706) and the next pour protocol, and brief the EOR and owner with a defensible service-life number. Trains the separation of strength from durability under chloride exposure, the 0.85·f c investigation threshold, and the discipline of paper-trail under NSR-10.