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Performance Analysis of Resilient Modulus and Fatigue Resistance of AC-BC Mixture with Full Extracted Asbuton and Reclaimed Asphalt Pavement (RAP) : Performance Analysis of Resilient Modulus and Fatigue Resistance of AC-BC Mixture with Full Extracted Asbuton and Reclaimed Asphalt Pavement (RAP)

Abstract

One way to be developed to overcome challenges in providing flexible pavement materials is to apply the green roads principle by reusing some or all of the old road pavement material or Reclaimed Asphalt Pavement (RAP) as a material for new road pavement, which if reused will affect the performance of the mixture, such as decreasing the level of durability and premature pavement damage, so an effort must be made to improve the performance of the recycled material, namely by adding full extracted Asbuton and rejuvenating materials. The RAP material was obtained from scratching the asphalt of the Jagorawi Toll Road. The mixture used was asphalt concrete-binder course (AC-BC) layer using 30%, 40%, and 50% RAP material, using full extracted Asbuton at 6%, and Nichireki rejuvenating material. Then, on mixtures with RAP material, Marshall Test, Resilient Modulus test with UMATTA, and resistance to fatigue with four points loading test with strain control were conducted. The use of RAP material with modified asphalt in the form of an addition of full extracted Asbuton into the Pen 60/70 Asphalt can increase the asphalt stiffness. Marshall test results showed that a mixture with 6% full extracted asbuton content and 0% RAP material content (A6RAP0) gave the highest stability value. The results of the Resilient Modulus test showed that the mixture with 6% full extracted asbuton content and 50% RAP material content (A6RAP50) gave a high Resilient Modulus value at a test temperature of 45oC. The results of the fatigue resistance test showed that the mixture with 6% full extracted asbuton content and 50% RAP material content (A6RAP50) at a strain level of 300 µε gave the longest fatigue life. Keywords: Reclaimed asphalt pavement (RAP), full extracted asbuton, asphalt concrete -binder course, modified asphalt, resilient modulus, fatigue life. Abstrak Salah satu cara dikembangkan untuk mengatasi tantangan dalam penyediaan material perkerasan lentur adalah menerapkan prinsip greenroads dengan memanfaatkan kembali sebagian atau keseluruhan material perkerasan jalan lama atau Reclaimed Asphalt Pavement (RAP) sebagai material untuk perkerasan jalan yang baru, dimana jika digunakan kembali akan mempengaruhi kinerja dari campuran seperti penurunan tingkat durabilitas dan kerusakan dini perkerasan, sehingga harus dilakukan suatu upaya untuk memperbaiki kinerja dari material daur ulang tersebut, yaitu dengan penambahan Asbuton murni dan bahan peremaja. Material RAP didapatkan dari hasil garukan aspal Jalan Tol Jagorawi. Campuran yang dipakai adalah Laston Lapis AC-BC menggunakan kadar material RAP sebanyak 30%, 40%, dan 50%, dengan penggunaan Asbuton murni sebesar 6%, serta bahan peremaja Nichireki, dan kemudian selanjutnya pada campuran dengan penggunaan material RAP dilakukan pengujian Marshall, Modulus Resilien dengan alat UMATTA dan ketahanan terhadap kelelahan (fatigue) metode four points loading test dengan kontrol regangan. Penggunaan material RAP dengan aspal modifkasi berupa penambahan Asbuton murni kedalam Aspal Shell Pen 60/70 dapat meningkatkan kekakuan aspal. Hasil pengujian Marshall menunjukkan campuran dengan kadar Asbuton murni 6% dan kadar material RAP 0% (A6RAP0) memberikan nilai stabilitas tertinggi. Hasil pengujian Modulus Resilien menunjukkan campuran campuran dengan kadar Asbuton murni 6% dan kadar material RAP 50% (A6RAP50) memberikan nilai Modulus Resilien yang tinggi pada temperatur pengujian 45oC. Hasil pengujian ketahanan terhadap kelelahan menunjukkan campuran dengan kadar Asbuton murni 6% dan kadar material RAP 50% (A6RAP50) pada regangan 300 µε memberikan umur kelelahan yang paling panjang. Kata-kata kunci: Reclaimed asphalt pavement (RAP), Asbuton murni, laston lapis antara, aspal modifikasi, modulus resilien, umur kelelahan.

Keywords

3.2 Full extracted asbuton Test Results

Physical test of full extracted asbuton was conducted to determine the characteristics of full extracted asbuton to be used in the AC-BC mixture. The results of the full extracted asbuton physical properties test are shown in Table 4.

1

Figure 2. Comparison of specifications for mixture gradation and aggregate gradation of RAP material

Table 4. Test results for full Extracted asbuton properties

Test TypeTest Result
Penetration (dmm)13,50
Softening Point (°C)73,00
Asphalt Specific Gravity1,055

3.3 The addition of Full extracted asbuton and Pen 60/70 Hard Asphalt to RAP Material Extracted Asphalt and Rejuvenating Material

Determination of the content of Nichireki rejuvenating material used was conducted based on the penetration value approach. Asphalt extracted from the RAP Material was heated up to 120°C and then was added with rejuvenating material based on the weight ratio. The asphalt extracted from the RAP material was heated to 120°C and then a rejuvenating material was added based on the weight ratio. The penetration value refers to the basic asphalt requirements, namely Pen 60/70 hard asphalt from the 2010 Bina Marga General Specifications (rev. 3). Along with the increase in the content of Nichireki in the RAP material asphalt, the penetration value will also increase. Based on the test results, it is known that the addition of Nichireki of 42% of weight of RAP material asphalt will provide a penetration value that is in accordance with Shell Pen 60/70 Asphalt.

To determine the physical properties of the combination of Shell Pen 60/70 Asphalt and full extracted asbuton with asphalt extraction of RAP and Nichireki, a test of the physical properties of asphalt from the mixture of these materials was conducted,

Table 5. Relationship of nichireki content with RAP asphalt penetration

Content NichirekiRAP Asphalt Penetration Value
(%)(dmm)
010,80
1018,63
2027,00
3039,79
4058,75
4261,90
5078,60

Table 6. Asphalt mixing physical properties test results

TestSpecificationsTest Result
TypeMinMaksA6RAP0A6RAP30A6RAP40A6RAP50
Asphalt
Penetration
607955,3863,6066,5067,10
Softening
Point
48-52,2550,7550,2549,25

where the composition of full extracted asbuton was 6%, RAP Material asphalt content were at 0%, 30 %, 40%, and 50%, and Nichireki was 42% of the test sample weight.

Table 6 shows that the addition of full extracted asbuton to the Shell Pen 60/70 Asphalt shows that this asphalt mixture is stiffer and has the ability to resist better surface temperatures. Asphalt mixture with the use of RAP and Nichireki materials of 42% results in a higher penetration value and lower softening point temperature along with the addition of RAP material content and the addition of Nichireki making the asphalt mixture softer.

The results of test and analysis of kinematic viscosity data show that the addition of full extracted asbuton to the Shell Pen 60/70 Asphalt and the use of RAP asphalt will make the mixture thicker, resulting in an increase in the mixing temperature and the temperature of the asphalt mixture, where the mixing temperature and compaction temperature range on the Pen 60/70 Shell Pen Asphalt (150-156°C and 142-147°C) was lower compared to the mixture of Shell Pen 60/70 Asphalt and the addition of full extracted asbuton (153,2-159,1°C and 141-146,4°C) and the addition of full extracted asbuton to the Shell Pen 60/70 Asphalt and the use of RAP Asphalt and Nichireki generated the highest mixing temperature and compaction

Table 7. Marshall parameter values under OAC<sub>Ref</sub> condition for each mixture variation

CriteriaA6RAP0A6RAP30A6RAP40A6RAP50
OAC (%)5,255,405,445,70
Stability (kg)2.135,671.446,311.410,991.348,54
Flow (mm)3,625,106,416,92
VIM (%)3,643,303,063,11
VMA (%)14,3414,6814,1614,18
VFA (%)74,0876,5677,6477,23
MQ (kg/mm)589,96283,59220,12194,88

352 Jurnal Teknik Sipil

temperature of Shell Pen 60/70 Asphalt (155-159°C and 147-151°C).

3.4 AC-BC mixture test

In this test, the mixtures used were:

  • a. A6RAP0 Mixture is a mixture with 0% RAP Material with an addition of 6% of full extracted asbuton;
  • b. A6RAP30 Mixture is a mixture with 30% RAP Material with an addition of 6% of full extracted asbuton:
  • c. A6RAP40 Mixture is a mixture with 40% RAP Material with an addition of 6% of full extracted asbuton;
  • d. A6RAP50 Mixture is a mixture with 50% RAP Material with an addition of 6% of full extracted asbuton.

3.4.1 Marshall test and absolute density approach

Marshall test was conducted to obtain the Optimum Asphalt Content (OAC) from each mixture variation. OAC was obtained based on asphalt content that met the Marshall parameter specifications and mixture volumetrics, namely stability, flow, VIM, VMA, and VFA based on Marshall test results to obtain Marshall OAC and Absolute Density Approach to obtain OAC<sub>Ref</sub> according to the 2010 Bina Marga General Specifications (rev. 3). The OAC value of each mixture is presented in Table 7.

3.4.2.Marshall immersion test

The Marshall Immersion test was conducted to determine the durability of the asphalt mixture against water damage by immersing the specimens in water at a temperature of 60°C for 24 hours, then comparing them with the specimens immersed in standard condition (immersion for 30 minutes). The percentage of stability comparison is called the Residual Strength Index (RSI). The test specimen used for this test was a mixture of asphalt under OAC<sub>Ref</sub> condition. Marshall immersion test results are shown in Table 8.

Table 8. Marshall immersion test Results

3.4.3 Resilient modulus test with UMATTA

Resilient Modulus Test was conducted using the UMATTA tool, where the test specimen used was diametrically shaped like the Marshall test specimen and made under OAC<sub>ref</sub> condition. The test method referred to AASHTO TP31 and ASTM D 4123-82 with test temperatures of 35°C and 45°C. The results of the Resilient Modulus test for each mixture variation are shown in Table 9.

3.4.4 Resistance to fatigue test with the four point loading test method

This test was conducted on every mixture variation under OAC<sub>Ref</sub> condition. The test object was a beam where each mixture variation was tested at two levels of strain, namely 300 and 500. According to AASHTO T 321-07, the fatigue test temperature was \(20\pm0.5\)°C. Fatigue test results can be seen in Table 10.

4. Data Analysis

4.1 RAP material extraction test analysis

The asphalt in the RAP material had undergone an oxidation process which caused the evaporation of the light fraction in the asphalt and the change in the liquid fraction (maltenes) to solid (asphaltenes) so that the asphalt became harder or stiffer, as seen from the average penetration value of 10.80 dmm and softening point at a temperature of 75.50°C, so a higher temperature or the addition of a rejuvenating material was needed to make the asphalt softer.

While for the aggregate of RAP material, the results of the sieve analysis show that the gradation of the aggregate of RAP material tended to be smooth, because the aggregate experienced wear due to friction with traffic loads and due to the asphalt stripping process using a recycler machine (milling machine)

Missterna DuamantesCharificationMixture Variation
Mixture PropertySpecification -A6RAP0A6RAP30A6RAP40A6RAP50
Standard Immersion Stability (kg), A>1.0001749,42.164,42.198,61.947,8
24-hour Immersion Stability (kg), B-1632,02.094,72.172,81.925,6
RSI (%) =B/A>9093,3096,8098,8098,90

Table 9. Resilient modulus test with UMATTA tool

Test Mixture TemperaturTest
Temperature
Resilien Modulus
(RM)
RM Standar
Deviation
MR Coefficient of Variance
Type(°C)(µm)(N)(MPa)DeviationOI Variance
ACDADO3510,541.5011.53536,132,35
A6RAP04514,131.4061.09044,014,04
A CD A DOO3515,621.4741.03719,971,93
A6RAP304518,84133978031,334,02
A CD A D 40359,1415251.86120,771,12
A6RAP404515,71133695029,753,13
A CD A DEO3512,3215061.38132,292,34
A6RAP504520,71134073421,552,93

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