52 ABNT NBR 15577-2-2018 2018-07-19 Portuguese Aggregates - Alkali-aggregate reactivity Part 2: Sampling, test sample preparation and test periodicity of aggregates for use in concrete 53 ABNT NBR 14689-2018 2018-07-19 Portuguese Ducts, subducts and microducts systems for telecommunication - D...
52 ABNT NBR 15577-2-2018 2018-07-19 Portuguese Aggregates - Alkali-aggregate reactivity Part 2: Sampling, test sample preparation and test periodicity of aggregates for use in concrete 53 ABNT NBR 14689-2018 2018-07-19 Portuguese Ducts, subducts and microducts systems for telecommunication - D...