BS EN 12697-21:2020 pdf free.Bituminous mixtures – Test methods.Indentation using plate specimens.
BS EN 12697-21 1 Scope This document specifies a test method for measuring the indentation of mastic asphalt when it is penetrated at a given temperature, load and for a fixed time period by a standardized cylindrical indentor pin with a circular flat-ended base. This document applies to mastic asphalt with aggregates of maximum nominal size less than or equal to 16 mm.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 12697-27 Bituminous mixtures – Test methods 一Part 27: Sampling 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses:IEC Electropedia: available at http://www.electropedia.org/ 一ISO Online browsing platform: available at https://www.iso.org/obp/ui 5.1 Sampling The sampling shall take place at fixed plants or at mobile equipment and shall be taken from laid or finished material according to EN 12697-27.The required mass to form laboratory samples is at least three increments of1 kg.5.2 Preparation of the samples If the sample is to be tested in a laboratory, the material has to be cleaned and freed from packaging material and from loose particles.Then reheat the mixture up to the pouring temperature and homogenize the molten material by stirring thoroughly. If the sample is to be tested immediately, a homogeneous sample at the pouring temperature shall be taken. The temperature shall never excess the maximum temperature according to the local regulations.The toughly liquid bituminous mixture shall be filled into the moulds and cooled down only in air.Accelerate cooling with cold water shall not be used. Whether or not the samples were reheated shall be reported.NOTE The reheating of samples in the laboratory is the preferred method.At least two samples shall be prepared.BS EN 12697-21 pdf downlaod.