3RD INTERNATIONAL CONGRESS ON TECHNOLOGY - ENGINEERING & SCIENCE - Kuala Lumpur - Malaysia (2017-02-09)

Evaluation Of Bna-r And Zeolite As An Additives On Performance Of Warm Mix Asphalt

Asphalt mixture can be used as road pavement materials and the airport with certain requirements, including the need to have rigidity and durability in receiving pressure wheels during the service. It's been a long time, the industry mix asphalt process of technical improvement, and one of the latest innovations is Warm Mix Asphalt (WMA). Some of WMA mixing process has been developed in recent years is mainly used in the field of road and some on the airfield. The decrease of the temperature has energy savings in the heating process bitumen. The use of additives on WMA in some studies still has the potential to cause problems on rutting, moisture susceptibility, stripping, cracking and fatigue resistance. WMA is expected to have the same performance or better than Hot Mix Asphalt (HMA). Indonesia has deposits of natural resources to be used as an additive in asphalt mixtures, such as rock asphalt Buton (Asbuton) and zeolite. Asbuton has been widely used as an additive in the form of: aggregate, powder, extracting half to full extraction. This is known as bitumen Asbuton. Rock Asphalt from Buton Island has a low penetration; even the extraction of bitumen Asbuton has a very low penetration. Buton Natural Asphalt Rubber (BNA-R) is one of the products of extraction Asbuton mixed with crumb rubber. BNA-R as a function of the additive has been able to improve the performance of HMA. In other studies have proved that Zeolites have been used as an additive in the process of lowering the temperature of the asphalt mix. This study was use WMA with added Zeolite material. This material has been able to reduce the temperature of the mixture, while BNA-R to modify the properties of the bitumen base. Aggregate composition using the composition of aggregate grading specifications for airport pavement, with the composition of BNA-R 5% and 10% and Zeolite content of 2%. Warm mix asphalt with additive materials have produced Resilient Modulus value by using the Universal Material Testing Apparatus (UMATTA) on optimum bitumen content each of which has been obtained from the Marshall test. Furthermore, the value of permanent deformation of asphalt mixtures tested using Wheel Tracking Machine (WTM). From this research it is known there have been changes in the characteristics of resilient modulus and permanent deformation due to the addition of BNA-R for type of aggregate composition. The FAA requires that minimum modulus of 1,380 MPa for the surface layer of flexible pavement with pavement temperature is 32ËšC. The use of BNA-R as modifier bitumen for WMA is not suitable except on the temperature test of 25 ËšC. The result shows that BNA-R modified binder for WMA can decrease the rutting potential. The rate of deformation (di/Ni) versus the cycle Ni for different samples types and temperatures of 40Ëš C is presented in a graph. At the beginning of the loading time, the value di/Ni is high, and the value decreases rapidly to near zero. The relationship between di/Ni and Ni is a power function that can be written as: di/Ni = a.(Ni)-b .........................(1) The value of the coefficient "a" and "b" is a parameter of WMA characteristics that can be identified through a series of tests WTM. The value of "b" can be concluded have had almost the same value at a certain temperature tests. In this study, the coefficient "b" is influenced by the characteristics of aggregates and asphalt mixture. The coefficient "b" was examined using WTM series of tests with different types of asphalt, aggregate composition and different variations of temperature testing. From a series of test results has been known to influence the characteristics of materials (aggregate composition or asphalt). The additive of local materials has improved the performance of the WMA for airport pavement with certain restrictions. Keywords: additives, modulus resilient, permanent deformation, warm mix asphalt
Muhammad Anis, Sigit Pranowo Hadiwardoyo, R. Jachrizal Sumabrata, Nurul Wahjuningsih