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This test is done to determine the bitumen content as per ASTM 2172. The apparatus needed to determine bitumen content are –
i) Centrifuge extractor
ii) Miscellaneous – bowl, filter paper, balance and commercial benzene.
A sample of 500g is taken.
Procedure to determine bitumen content
i) If the mixture is not soft enough to separate with a trowel,place 1000g of it in a large pan and warm upto 100oC to separate the particles of the mixture uniformly.
ii) Place the sample (Weight ‘A’) in the centrifuge extractor. Cover the sample with benzene, put the filter paper on it with the cover plate tightly fitted on the bowl.
iii) Start the centrifuge extractor, revolving slowly and gradually increase the speed until the solvent ceases to flow from the outlet.
iv) Allow the centrifuge extractor to stop. Add 200ml benzene and repeat the procedure.
v) Repeat the procedure at least thrice, so that the extract is clear and not darker than the light straw colour and record the volume of total extract in the graduated vessel.
vi) Remove the filter paper from the bowl and dry in the oven at 110 + 5oC. After 24hours, take the weight of the extracted sample (Weight ‘B’).
REPORTING OF RESULTS
Bitumen content = [(A-B)/B]×100 %
Repeat the test thrice and average the results.
If you have a query, you can ask a question here.
15 comments on "Determining Bitumen Content"
please update me civil engineering IS CODE @ IRC CODE & Speceally various type of test ROAD & BRIDGE Structure.
how can recover clean benzene after the extraction?
After the extraction just dry the bowl to the sun heat and burn the mix with match sticks and take out weigh when the flame is fully off then we weigh it…
where can we use bitumen for important purpose?
Plz update me secives gradation of bitumin
I found ur site vey informative and technically knowledgeable.I want to know how we can calculate the dry volume of bitumen concrete as we calculate in cement concrete.
pls tell about the frame structure design
i thought we have to conduct a sieve analysis test to determine the bitumen content .
Is there any apparatus available in market that can find out bitumen content in asphaltic materials at site itself.
1.WHAT ARE ALL THE VARIOUS Bitumen Content TESTERS AVAILABLE.
2.IS ANY OTHER SIMPLE SYSTEM DEVELOPED IN BETWEEN THE CONVENTIONAL & BURNING METHOD.
PL. SEND ME THE COMPLETE DETAILS INCLUDING THE MANUFACTURE, STANDARDS, COST, RELIABILITY ETC.
Sir, Can there be any tests to determine the bitumen content in post construction core? if so what will be correction factor. Also kindly state the IS code for the test of bitumen sample.
sir, will you please tell me the exact process of how and from where bitumen is isolated…………….
Are bitumen paper classified as hazardous ? Can we dump it at a normal municipal dump site?
excellent description of test method. It is very useful.
While determining bitumen content of Bituminous macadam taking sample from field by core cutter ,the result was found to be 3.5%. Will percentage content reduce after few years ?