Path: Top S2-Theses Highway Systems and Engineering 1998

Penelitian laboratorium dari split mastic asphalt dengan serat selulosa CF-31500

Master Theses from JBPTITBPP / 2007-04-16 12:32:39
Oleh : Ilham, S2 - Highway Systems Engineering
Dibuat : 1998-00, dengan file

Keyword : Split Mastic Asphalt (SMA); Laboratory investigation

Split Mastic Asphalt (SMA) mixes are made with an open-graded aggregate and consequently can hold more bitumen than continuously-graded mixes such as asphalt concrete. It is usual to include an additive in SMA mix to prevent outflow of the bitumen and provide micro-reinforcement. One
such additive is CF-31500, a product derived from ground wood pulp and which contain about 85 cellulose fibres. This thesis describes a laboratory investigation of SMA mixes made with 0, 0.2, 0.3, 0.4 and 0.6 % CF-31500 by weight of aggregate plus bitumen. For purposes of comparison an asphalt concrete surfacing mix was also investigated. Preliminary investigations showed that the effect of adding CF-31500 to bitumen was to increase softening point and reduce penetration, thereby indicating a reinforcing effect. Marshall analysis of the SMA mixes showed that the mixes made with 0.2 and 0.3 % CF-31500 were satisfactory in terms of Bina Marga design criteria and had optimum bitumen content that were almost identical. Specimens of these mixes prepared at optimum bitumen content were investigated using the Marshall immersion, indirect tensile strength and wheel tracking tests. With the exception of the wheel tracking test almost identical performance was observed for the mixes made with 0.2 % and 0.3 % CF-31500. In the wheel tracking test the performance of the mix made with 0.3 % CF-31500 was superior, with rate of deformation and dynamic stability value of 0.018 mm/min and 2362 passes/mm as compared with values of 0.022mm/min and 1908 passes/mm observed for the mix made with 0.2 % CF-31500. The LASTON mix complied with Bina Marga design criteria at a Bitumen content of 6.1 %. The stability of the mix was about 46 % higher than that of the SMA mixes but its performance in the wheel tracking test was poorer; permanent deformation after 2520 passes of the wheel was 8.85 mm as compared to 3.11 mm for the SMA with 0.3 % CF-31500. The relatively low Marshall Quotient value and greater bitumen film thickness of the SMA mixes, when compared with the LASTON mix, should provide, and retain for a longer period, the flexibility required to minimized cracking.
However other type of tests, e.g. creep tests and stiffness modulus tests, should be conducted to establish with greater certainty which mix type, SMA or LASTON, provides better resistance to permanent deformation.

Deskripsi Alternatif :

Split Mastic Asphalt (SMA) mixes are made with an open-graded aggregate and consequently can hold more bitumen than continuously-graded mixes such as asphalt concrete. It is usual to include an additive in SMA mix to prevent outflow of the bitumen and provide micro-reinforcement. One
such additive is CF-31500, a product derived from ground wood pulp and which contain about 85 cellulose fibres. This thesis describes a laboratory investigation of SMA mixes made with 0, 0.2, 0.3, 0.4 and 0.6 % CF-31500 by weight of aggregate plus bitumen. For purposes of comparison an asphalt concrete surfacing mix was also investigated. Preliminary investigations showed that the effect of adding CF-31500 to bitumen was to increase softening point and reduce penetration, thereby indicating a reinforcing effect. Marshall analysis of the SMA mixes showed that the mixes made with 0.2 and 0.3 % CF-31500 were satisfactory in terms of Bina Marga design criteria and had optimum bitumen content that were almost identical. Specimens of these mixes prepared at optimum bitumen content were investigated using the Marshall immersion, indirect tensile strength and wheel tracking tests. With the exception of the wheel tracking test almost identical performance was observed for the mixes made with 0.2 % and 0.3 % CF-31500. In the wheel tracking test the performance of the mix made with 0.3 % CF-31500 was superior, with rate of deformation and dynamic stability value of 0.018 mm/min and 2362 passes/mm as compared with values of 0.022mm/min and 1908 passes/mm observed for the mix made with 0.2 % CF-31500. The LASTON mix complied with Bina Marga design criteria at a Bitumen content of 6.1 %. The stability of the mix was about 46 % higher than that of the SMA mixes but its performance in the wheel tracking test was poorer; permanent deformation after 2520 passes of the wheel was 8.85 mm as compared to 3.11 mm for the SMA with 0.3 % CF-31500. The relatively low Marshall Quotient value and greater bitumen film thickness of the SMA mixes, when compared with the LASTON mix, should provide, and retain for a longer period, the flexibility required to minimized cracking.
However other type of tests, e.g. creep tests and stiffness modulus tests, should be conducted to establish with greater certainty which mix type, SMA or LASTON, provides better resistance to permanent deformation.

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