Qomaruddin, Mochammad (2024) METODE PYROLYSIS PADA AGREGAT RECLAIMED ASPHALT PAVEMENT UNTUK MENINGKATKAN KINERJA MORTAR. Doctoral thesis, UNDIP.

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Abstract

The low utilization of Reclaimed Asphalt Pavement (RAP) waste as the main material for
rigid pavement is due to weaknesses in the bond of the existing aggregate asphalt layer.
Many researchers admit that the use of RAP for rigid pavement construction is ineffective
and inefficient. The objectives of this research are (1) to develop a pyrolysis method for
extracting asphalt from RAP, (2) to find chemical elements that cause a decrease in the
quality of RAP mortar, (3) to analyze the effect of RAP pyrolysis on the mechanical
properties of mortar, (4) to analyze the interface between aggregates with cement paste.
The novelties proposed for in this research are (1) The extraction of asphalt through
pyrolysis (2) Mechanical properties of mortar using pyrolysis aggregate on compressive
strength, flexural strength and failure pattern. The research method used is experimental
in the chemistry laboratory and in the construction materials laboratory. The test methods
used in the laboratory are: SEM, EDX, FTIR, asphalt content extraction test, mortar
compressive strength test and mortar flexural tensile strength test. The results obtained
were (1) Extraction of RAP aggregate asphalt using the pyrolysis process was 0.95%
lower than asphalt extraction using the centrifugal method. (2) The chemical elements of
asphalt attached to the RAP aggregate are hydrocarbons and sulfur, where a thin layer
of RAP asphalt is the cause of a decrease in the quality of the mortar. In PYRO, there
exists sulfur which led the mortar produced is lower compared to mortar of NA, which
caused by the loss of hydrocarbon from pyrolysis process (3) The ability of PYRO mortar
to increase compressive strength by 23% and tensile strength by 20% compared to RAP
mortar. The PYRO mortar can be used as rigid pavement which fulfill the requirement of
SNI 8457 (2017) with flexural strength of 3.5 to 4.1 MPa on 28 days which resulted in
5.86 MPa (4) The thin asphalt layer of RAP aggregate has micro cracks at the interface
of the RAP aggregate and cement paste. The relationship between compressive strength
and flexural strength obtains a relationship coefficient value of ft c for mortar aged
28 days for each aggregate NA 1.28; RAP 0.97 and PYRO 1.02. The failure pattern of the
mortar cubes occurs crushing and the failure pattern of the blocks occurs with broken
cracks located in the middle of the span due to moments with the surface area of loose
aggregate due to ITZ being RAP of 15.44%.
Keywords : Mortar, RAP, Pyrolysis

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