BS EN 12390-7 pdf free download
BS EN 12390-7-2019 pdf free download.Testing hardened concrete Part 7: Density of hardened concrete.
This document specifies a method for determining the density of hardened concrete. It is applicable to
lightweight, normal-weight and heavy-weight concrete.
It differentiates between hardened concrete in the following states:
1) as-received;
2) water saturated;
3) oven-dried.
The mass and volume of the specimen of hardened concrete are determined and the density calculated.
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 12390-1, Testing hardened concrete — Part 1: Shape, dimensions and other requirements for specimens and moulds
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and JEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp 4 Apparatus
4.1 Calllpers and rules, with a maximum permissible error of 0,5 % of the dimension, for measuring the dimensions of the specimens.
4.2 Balance, equipped with a stirrup for weighing the specimen in both air and water with a maximum permissible error of 0,1 g of the mass.
4.3 Water tank, fitted with a device to maintain the water at a constant level and of sufficient size to allow the specimen on the stirrup to be fully immersed to a constant depth (see Figure 1).
lithe reading of the balance is affected to within the accuracy required due to the displacement of water when immersing the specimen, then the tank should be fitted with a device to maintain the water at a constant level. The tank should be of sufficient size to allow the specimen to be fully immersed.
4.4 Ventilated oven, in which the temperature is capable of being controlled at (105 ± 5) °C. NOTE The apparatus required depends upon the method selected for determining the volume of the
specimen.
4.5 Moist cloth.
5 Test specimens The minimum volume of a specimen shall be 0,785 I. If the declared value of D of the coarsest fraction of aggregates actually used in the concrete (Dmax) exceeds 25 mm, the minimum volume (in mm3) shall be not less than 50 D3, where D is the declared coarsest fraction of the aggregate in mm. Normally, the entire specimen as received shall be used for the determination. If the shape or size of a specimen is such that it is not possible to use all of it, a smaller specimen may be broken or sawn from the original. Capped specimens shall not be used.
6 Procedures
6.1 General
6.1.1 Determination of mass
This European Standard recognizes three conditions under which the mass of a specimen can be determined:
a) as-received;
b] water saturated;
c) oven-dried.
6.1.2 Determination of volume
This European Standard recognizes three methods for determining the volume of the specimen:
a) by water displacement (reference method);
b] by calculation using actual measurements;
c) for cubes, by calculation, using checked, designated dimensions.BS EN 12390-7 pdf download.
