Chile Establishes Standard for Chemical Analysis of Cements
Chile has established a new standard, NCh 147:2020, for the chemical analysis of cements used in pastes, mortars, and concretes. The standard defines procedures for determining the chemical components of cements. This standard applies to the cements defined in NCh148 and used in pastes, mortars and concretes. This standard describes the reference methods and, in certain cases, an alternative method that can be considered equivalent to the reference methods when it has been previously validated considering the provisions of NCh-ISO/IEC 17025. In case of dispute, only reference methods should be used.
Annex A provides general guidelines on the alternative method that uses X-ray fluorescence (XRF) for the determination of Silicon Oxide SiO2, Aluminum Oxide Al2O3, Iron Oxide Fe2O3, Calcium Oxide CaO, Magnesium Oxide MgO , Sulfur Trioxide SO3, Potassium Oxide K2O, Sodium Oxide Na2O, Titanium Dioxide TiO2, Phosphorus Oxide P2O5, Manganese Oxide Mn2O3, Strontium Oxide SrO, Chloride Cl- and Bromine Br.
The alternative method can be applied to other relevant cases when proper calibrations have been performed. This method is based on the use of molten beads or pressed pellets and on analytical validation using reference materials.
This standard does not address safety or environmental issues, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate health and safety practices and to determine the degree of application of regulatory limitations prior to use.