Title: QUALITY CONTROLS OF BITUMEN IN A ROAD CONSTRUCTION COMPANY --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985
Abstract: To evaluate the quality of bitumen from the crude oil's origin as done in earlier days is not sufficient. Standard tests as well as additional viscosity tests do not give enough evidence. Additional test methods and nominal values had to be established to enable a differentiated evaluation of the bitumen's quality. In 1968 these additional quality instructions were established in the company. A revision was made in 1975. The principle requirements concern the behaviour of foam, the adhesion to the aggregates and the ductility at low temperatures. Considerable foaming of the bitumen in the mixture had often caused troubles while laying; insufficient adhesion of the binder to the aggregates could be observed in faulty pavements and the ductility at low temperatures significantly separates the Venezuelan bitumen -which is subjectively considered to be better -from middle-east -bitumen. The ductility at low temperatures corrected to a uniform penetration gives also an indicated on the colloidal structure of the binder. The tests required can be carried out with the usual laboratory equipment and the time required is acceptable even for permanent routine tests. The results proved to be sufficiently reproducible. At the beginning the minimum requirements were often not achieved, bitumen deliveries had to be rejected and occasionally suppliers had to be changed. Soon improvements in quality could be established; really poor results, which occured often before 1970, were hardly to be found in bitumen samples taken from our mixing plants. Concerning the foam behavior and the adhesion to the aggregates, it seems that the results are achieved by additives in the binder, whereas the effect on ductility is caused by the bitumen itself. For the covering abstract of the symposium see IRRD 815173.
Publication Year: 1985
Publication Date: 1985-01-01
Language: en
Type: article
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