WO1994023279B1 - Device for determining the binder content of a bituminous construction material sample - Google Patents

Abstract

A device for determining the binder content of bituminous construction material samples, in particular asphalts, has a furnace (14, 100) provided with a heating and a sample chamber (56, 58, 105, 112), as well as a weighing device (30, 104) for determining the weight of the sample. In order to check several samples at short intervals, a cold wall furnace which can be controllably cooled is used. In order to obtain reproducible results, it is further provided that the samples are surface heated.

Claims

AMENDED CLAIMS [received by the International Bureau on 19 October 1994 (19.10.94), original claims 1-12 replaced by amended claims 1-7 (2 pages)] Device for determining the binder content of a sample of bituminous building material 1. Device for determining the binder content of samples of bituminous materials by thermal decomposition, in particular asphaltene, comprising a sample receiving (56, 58, 105, 112) receiving, a heating auf¬ facing furnace (14, 100) and a weighing device (30 , 104) for determining the weight of the sample, characterized in that the furnace (14, 100) has at least one double-jacket (16, 18) which can be cooled with gas in a controlled manner (cold wall oven), that in the cold-wall oven (14, 100 ) at least above the sample receiving the surface receiving sample (56, 58, 106) the sample surface heating heating (116, 118) is arranged, which is arranged above and / or below the sample holder, that the inside of the oven via a bypass (76 ) is connected to a blower having flue gas discharge (78) and that air can be supplied to the furnace during the thermal decomposition of the binder to an extent that an ignition of w is ausge¬ during the decomposition gases resulting closed. 2. Apparatus according to claim 1 or 2, characterized in that the furnace is a cold wall flat furnace (100). 3. Device according to at least one of the preceding claims, characterized that between the surface of the sample and facing planar heating (116) is a clear distance X, which is approximately 1.5 to 5 times the sample layer thickness, wherein preferably the clear distance X is approximately 50 - 100 mm. 4. Device according to at least one of the preceding claims, characterized in that in the oven (100) above the sample receptacle (106) is formed a reaction gases or exhaust air leading transverse flow. 5. The device according to at least one of the preceding claims, characterized in that in a side wall of the furnace (100) has a closable opening or this is or the furnace head side via a pivotable or liftable lid (58) is closable, wherein the lid is preferably inside, for example Having a compressed air source (70) connectable Gasverteiler¬ element (66) as gas distribution ring. 6. The device according to at least one of the preceding claims, characterized in that the sample receptacle comprises a cup-shaped sample container (56, 106) with at least one can be arranged in this sample cup (56, 110), wherein preferably the sample cup (58, 106) spaced from the sample container inside - Wall runs. 7. The device according to at least one of the preceding claims, characterized in that the sample container consists of superimposed screens of different mesh sizes, which are spaced through openings having empty rings.