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CHAPTER III METHOD OF RESEARCH
3.1
Location and Type of Research
This research conducted in the Laboratory of University Muhamadiya Suarakarta UMS. Then, this research was conducted with experimental research because this research use
experiment variable and control variable of research.
3.2 Parameter and Variable
In the context of this research, there are two kinds of variables that will be used, namely dependent and independent variable. The dependent variable are strength and durability while
the independent variable arecrumb rubber 3, 4 and 5, and bitumen content 4.5, 5, 5.5, 6 and 6.5. The desccription about variable and parameter will be discussed in
Table 3.1
Table 3.1.Parameters and Variables Analysis
Value Parameters
Properties of asphalt concrete 6070
- Penetration0.1mm - SpecificGravity
- SofteningPointºC - Ductility Cm
Asphalt specifications value
Properties of coarse and fine aggregate
- Los Angeles Abrasion - Apparent specific gravity
- Absorption - Apparent specific gravity
- Absorption - Sand Equivalent
- Penetration - Softening Point
- Asphalt Density Sieve test, coarse
aggregate and fine aggregate
specification value
Variables Asphalt concrete
modified crumb rubber 3, 4 and
5 - Data Examination
Asphalt. - Data Marshall Properties
Test. - Data Indirect Tensile
Strength Test ITS. - Data Unconfined
Compressive Strength Test UCS.
Marshall Stability, Flow, MQ,VMA,
VIM, VFA
Bitumen content 4.5, 5, 5.5, 6
and 6.5 Bitumen content
Optimum bitumen content OBC
commit to user
15 Based on Table 3.1, it can be seen that the parameter of this research are aggregate, both
coarse and fine; marshall properties. Moreover, this research is presented variable namely asphalt concrete modified crumb rubber 3, 4 and 5 and bitumen content 4.5, 5,
5.5, 6 and 6.5.
3.3 Data
Based on Table 3.1 , it can be seen that this research use both coarse and fine aggregates. The coarse aggregate use should have rough surface, angular sharp and clean from other materials
that could interfere with the binding process. Aggregates are used in the form of crush stone in the dry condition. The types of test conduct on aggregates are as follows.
a. Sieve Analysis
This examination is intended to determine the gradation, both coarse aggregate and fine aggregates. Examination procedures refer to AASHTO T27 - 88
b. Specific Gravity and Absorption
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