EN 1367-5-2011 pdf download.Tests for thermal and weathering properties of aggregates – Part 5: Determination of resistance to thermal shock.
This EN 1367-5 specifies methods for the determination of resistance to thermal shock of aggregates, subject to heating and drying in the production of hot bituminous mixtures
This standard descnbes the reference method use for type testing and in case of dispute. For the purpose of type testing and in case of dispute only the reference method should be used, For other purposes, in particular factory production control, other methods may be used provided than an appropriate working relationship with the reference method has been established.
2 Normative references
The following referenced documents are indispensable for the application 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 932-1, Tests for general properties of aggregates — Part 1: Methods for sampling
EN 932-5, Tests for general properties of aggregates — Part 5: Common equipment and calibration
EN 1097-2, Tests for mechanical and physical properties of aggregates — Part 2: Methods for the determination of resistance to fragmentation
ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
thermal shock
change in physical properties of aggregates subjected to 700 °C environment for a 3 mm interval
3.2
test specimen
sample used in a single determination when a test method requires more than one determination of a property
3.3
constant mass
successive weighings after drying at least 1 h apart not differing by more than 0,1 %
NOTE In many cases constant mass can be achieved after a test portion has been dried for a pre-determined period
in a specified oven at (110 ± 5) °C. Test laboratories can determine the time required to achieve constant mass for specified types and sizes of sample dependent on the drying capacity of the oven used.
4 Principle
The test involves two test specimens with the grading required by EN 1097-2. One test specimen is soaked heated to 700 °C for 3 mm. The resistance to fragmentation is then determined in accordance with EN 1097-2 on the first test specimen after heating and the strength loss calculated by comparison with the result of the second test specimen which has not been heated The increase in undersize passing the 5 mm sieve after thermal shock is also calculated.
5 Apparatus
5.1 General
All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5.
5.2 Apparatus for heat test
5.2.1 Distilled or deionised water.
5.2.2 Furnace or oven, heated by radiation only. capable of maintaining test portions at a temperature of:
(700 ± 100) °C for the specified time period using a suitable control system.
The minimum internal dimensions shall be:
a) width—260mm;
b) height — 160 mm;
C) depth — 450 mm.
5.2.3 Test sieves conforming to ISO 3310-2 of 5,0 aperture size will be used.
For Los Angeles or Impact tests, sieves specified in EN 1097-2 will be used.
5.2.4 Balance of adequate capacity, with an accuracy of ± 0,5 g.
5.2.5 Ventilated drying oven, with forced circulation of adequate capacity.
The oven shall be capable of being controlled at (110 ± 5) °C.
5.2.6 Heat resistant metal test plate, thickness (4 ± 0,5) mm, length (440 ± 5) mm, width (240 ± 5) mm and provided with a turned up lip of height (12 ± 1) mm, see Figure 1.
5.2.7 Metal support frame or grid, for the test plate to give a clearance height of at least 10 mm between the base of the test plate and the bottom of the furnace.
NOTE An example is given in Figure 2.
5.2.8 Heat resistant plate, thickness (10 ± 1) mm, length (450 ± 5) mm, width (250 ± 5) mm.
5.2.9 Tongs, to transfer the test plate to and from the furnace.
5.2.10 Scoop, flat based 220 mm wide by 350 mm long, to spread the test portion on the test plate.
5.2.11 Heat resistant metal sieve fabric of approximately 2 mm aperture, size (250 ± 5) mm by (445±5) mm. to cover the test portion.
5.2.12 Metal receiver, large enough to hold the test portion.
5.2.13 Absorbent cloth or towel of adequate size.EN 1367-5-2011 pdf download.