In Testing Hardened Concrete—Part 3: Compressive Strength of Test Specimens; AENOR: Madrid, Spain, 2011. 66. AEN/CTN 83—HORMIGÓN. UNE-EN 12390-7:2009. In Testing Hardened Concrete—Part 7: Density of Hardened Concrete; AENOR: Madrid, Spain, 2009. 67. AEN/CTN 83—HORMIGÓN. UNE-EN...