High Resistance Polymermodified Binders to Secure ... - Nynas

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The value D for the compaction resistance is resulting from the iteration calculation of the exponential function of the compaction. The function is build with the decreased thickness of the specimen in connection with the number of blows. The figure 4 shows the result for the stone mastic asphalt 0/16 S by using the Nypol 25 HR. Figure 4: Evaluation of the Compactability – Stone Mastic Asphalt 0/16 S by using Nypol 25 HR In comparison with the Nypol 25 HR you can see in table 3 the results of the German compactability test from the higher polymermodified binder that was advertised for the bid from the tender of the Container Terminal Hamburg. For the mixture of the binder course it is again similar the same behaviour. For the stone mastic asphalt the Nypol 25 HR reach a better result of roughly 10 percentage for the compactability and out of it for the workability. Table 3: Results of German Compactability Test – Container Terminal Hamburg Binder Course Asphalt 0/16 S Stone Mastic Asphalt 0/16 S Compaction Resistance D [21 Nm] Nypol 25 HR Compaction Resistance D [21 Nm] Tender Product 40,6 40,4 37,7 41,1
3.2 Application Example Bus Station Due to the good experiences of the high resistance PmB the Nypol 25 HR was also used for the remediation of several areas of the bus station in Hamm (Germany). The old areas made out of asphalt around the central platform had huge deformations and had to be rehabilitated. The old asphalt binder course and the old stone mastic asphalt were participating in the huge deformations. The optical impression of the whole Bus Square should not be changed, i.e. other constructions like concrete or composite pavement structures was not possible. The rehabilitation had to be done in an asphalt construction. After milling of the both old layers a new construction with binder course asphalt 0/22 S and with stone mastic asphalt 0/11 S by using the Nypol 25 HR was build. In the following table 4 the results of the wheel tracking tests are shown. The results are extremely good compare with the German limit of 3,5 mm for binder courses. The rut depth for the surface course is below 1,0 mm. Table 4: Results of German Wheel Rutting Test – Nypol 25 HR (Steel Wheel at 50 °C) Binder Course Asphalt 0/22 S Stone Mastic Asphalt 0/11 S Binder Content [M.-%] Air Void Content [Vol.-%] Rut Depth at 50 °C [mm] 4,2 6,3 2,2 6,8 4,2 0,8 The paving of the asphalt mixtures were made with a conventional paver by using a 9,5 t smooth-wheeled vibration roller. The compaction was controlled with a Troxler probe. Due to the good workability of the HR PmB paving temperatures between 160 and 170 °C were used without any problems for the compaction of the asphalt mixture. The demand compaction degree of 97 % was achieved. The laying was done during the hot summer period in August 2004. Referring to this the Bus Square was closed for three days to guarantee the cooling down. On Monday morning the bus traffic started again. 4. Conclusions Based on the experiences of the high resistance high polymermodified binder is resulting that with the Nypol 25 HR and the Nypol 45 HR two binders are available which are able to ensure durable asphalt pavement for different applications. The range of plasticity of these high resistance binders amounts nearly 100°C. The heat stability amounts more than double measured by complex shear modulus and compared with a standard PmB. The behaviour at low temperatures is not affected measured with the Bending Beam Rheometer. The asphalt performance for binder course asphalt and stone mastic asphalt tested with the wheel-rutting tester (steel wheel at 60°C) is exceptional well. 5. References Barth, R.: Das Nynas - Spezialbindemittel für sehr hoch beanspruchte Verkehrsflächen, Performance, Issue 3, 2003
Page 1 and 2: Dr.-Ing. Ingo Nösler Product Suppo
Page 3 and 4: In the table 1 is shown the tender
Page 5 and 6: 3. Application of High Resistance P
Page 7: Table 2: Results of German Wheel Ru

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