Goods must comply with the Technical Specification (Annex No. 3).
Specific requirements for concrete mixes include strength class (e.g., C20/25, C30/37), exposure class (e.g., XC2, XD2), water penetration class (e.g., W2, W8), and slump class (e.g., S2, S3).
For reinforced concrete products (lintels), precise dimensions with permissible deviations are specified…