EN 1367-3-2001 pdf download.Tests for thermal and weathering properties of aggregates —Part 3: Boiling test for ‘Sonnenbrand” basalt.
7 Preparation of test portions
7.1 Test portion for the visual examination of a piece of basalt rock for signs of “Sonnenbrand”
For the determination of the presence of signs of Sonnenbrand the laboratory sample shall be taken from a quarry stock pile and shall consist of one rock piece, wtiich shall be large enough to give a sawn surface
equal to or greater than 0,005 m.
NOTE A piece with a minimum dimension of 75 mm should be suffcient.
Cut the rock piece to give two sawn test portions, and mark each for identification. Wash each test portion and remove adherent particles by brushing.
7.2 Test portion for the determination of loss in mass of basalt aggregate after boiling
Reduce the laboratory samples in accordance with EN 932-2.
Remove the oversize and undersize by dry sieving in accordance with EN 933-1.
Wash the sample and dry it to constant mass at (110± 5) °C and allow to cool.
Weigh and record the test portion mass in grams as m0.
The minimum mass of the test portion shall be as specified in Table 1.
NOTE If it is intended to carry out strength tests, the lest porbon should correspond to the test
portions needed for the determination of the loss In strength as specified in 7.3. allowing for some waste.
Place one of the two test portions in the steel can and fill with distilled or demineralized water so that the test poe-hon will remain covered during boding, and cover with a lid. Bring the can and contents to boiling within 0,5 h, and maintain boiling for (36 ± 1) h. During this period check by inspection that the test portion remains covered with water
Remove the warm test portion from the can and check for signs of Sonnenbrand during the drying period.
NOTE At this stage make sure that adequate precautions are taken by personnel to avoid scalding, bums. etc.
lightly moisten the sawn surface with a moist cloth and as the sawn surface dries again, examine for any of the following and record observations
a) foemation of grey/white star shaped spots or radiating hairline cracks;
b) formation of larger cracks;
c) breakage of the test portion.
NOTE 1 A comparison can be made between the test portion under test and the unboiled test portion.
NOTE 2 Several specimens from a number of pieces of basalt can be boiled in the can at the same time,
8.2 DetermInation of mass loss of basalt aggregate after boiling
Place the test portion in the steel can and fin witti water so that the specimen will remarn covered during boding, and cover with lid.
Bring the can and contents to boiling within 0.5 h and maintain boiling for (36 ± 1) h.
Ailow the can and contents to cool to ambient temperature, decant the water and transfer the test portion to suitable ways.
Dry to constant mass at(1 10 ± 5) C and allow to cool.
Dry sieve the test portion on a sieve having an aperture of half the lower nominal size.
Weigh the mass retained on the sieve in grams (m1).
8.3 Determination of strength loss of basalt aggregate after boiling
Boil one test portion and allow to cool and dry at (110 ± 5) C to constant mass as specified in 82.
Test both test portions in accordance with EN 1097-2 and record the strengths obtained on the boiled and unboiled portions as LA1 and L.4 respectively.
NOTE lithe impact test specified in EN 1097-2 is to be used, at least three test specens from the same laboratory sample, as specified in 6.2 of EN 1097-2:1998, should be boiled and the mean strength recorded as SZ1. The mean impact value of the three unboiled test specimens should be recorded as 574).
OBSI l7Augus* 2004
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EN 1367-3:2001
9 Calculation and expression of results
9.1 Percentage loss in mass of basalt aggregate
Calculate the percentage loss in mass to the nearest 0.1 % in accordance with the following equation:EN 1367-3-2001 pdf download.