Pengaruh Residu Cat Marka Water-Based Terhadap Kuat Geser Interlayer Lapisan Aspal Beton Overlay
Aditya Pratama, Ir. Taqia Rahman, S.T., M.Sc., Ph.D., IPM.
2025 | Skripsi | TEKNIK SIPIL
Marka jalan berperan penting bagi keselamatan
dan keteraturan lalu lintas. Pada rehabilitasi overlay HMA dengan cat
marka water-based, residu marka lama sering tersisa sebagai lapisan non-bitumen
pada antarmuka. Residu ini menurunkan Interlayer Shear Strength (ISS)
dan berpotensi memicu slippage, shoving, serta delaminasi. Tantangan meningkat
pada suhu tinggi dan beban berat. Stabilitas antarlapisan terhadap gaya geser
ditinjau melalui Stress to Shear Ratio (SSR), yaitu perbandingan
tegangan geser aktual dengan kuat geser antarmuka.
Interface menghubungkan AC-WC eksisting dengan AC-WC overlay
menggunakan aspal PG 60/70 berkadar optimum 5,28% serta agregat andesit sesuai
spesifikasi AC-WC. Variabel penelitian meliputi ketebalan residu 0, 1, 2, dan 3
mm; suhu 25, 40, dan 60 °C; serta beban normal 1, 2, dan 3 kN. Pengujian
mencakup geser langsung (Leutner) dan geser dengan beban normal memakai
alat pegas. Prosedur meliputi pembuatan HMA bawah, pengaplikasian cat marka dan
tack coat, pembuatan overlay, serta pengujian geser. Nilai kuat
geser digunakan dalam analisis SSR untuk menilai keamanan antarmuka pada beban
lalu lintas model MST 8 Ton, 10 Ton, dan Truk 1.2H.
Pada suhu 25 °C, kuat geser tertinggi terjadi
pada residu 0 mm (1,098 MPa dengan displacement 1,780 mm), turun pada
1–3 mm (0,780–0,594 MPa) dengan displacement hingga 3,407 mm. Kenaikan
suhu menurunkan kuat geser di semua ketebalan (0 mm: 1,098 menjadi 0,614 hingga
0,168 MPa). Penambahan beban normal meningkatkan kuat geser, namun memperbesar displacement
(0 mm; 25 °C: 1,098 menjadi 1,345 MPa; 1,780 menjadi 4,550 mm). Failure
envelope residu 3 mm selalu di bawah 0 mm. Analisis BISAR menunjukkan
skenario full slip lebih kritis dibanding full bonding. SSR pada
60 °C mencapai ? 1 sehingga overlay gagal, sedangkan MST 8 Ton aman (SSR <
1>slippage
failure.
Road markings play an important role in ensuring traffic safety and order.
During HMA overlay rehabilitation using water-based paint, residual markings
often remain as non-bituminous layers at the interface. These residues reduce
the Interlayer Shear Strength (ISS) and may trigger slippage, shoving, and
delamination. Challenges become more significant at higher temperatures and under heavy loads. The interlayer stability
against shear stress is evaluated through the Stress to Shear Ratio (SSR),
defined as the ratio between actual shear stress and interlayer shear strength.
The interface connects the existing AC-WC with the AC-WC overlay using PG
60/70 asphalt with an optimum binder content of 5.28% and andesite
aggregate mix in accordance with
AC-WC specifications. The research variables include residue thicknesses of 0,
1, 2, and 3 mm; temperatures of 25, 40, and 60 °C; and normal loads of 1, 2,
and 3 kN. The tests consist of direct shear (Leutner) and shear under normal
load using a spring-based device. The procedure includes preparing the lower
HMA layer, applying paint marking and tack coat, constructing the overlay, and
performing shear tests. The obtained shear strength values are used in SSR
analysis to evaluate interface safety under traffic load models of Maximum Axle
Load (MST) 8 Ton, 10 Ton, and Truck 1.2H.
At 25 °C, the highest shear
strength occurred at 0 mm residue (1.098 MPa with 1.780 mm displacement),
decreasing at 1–3 mm (0.780–0.594 MPa) with displacement up to 3.407 mm.
Increasing temperature reduced shear
strength across all thicknesses (0 mm: 1.098 to 0.614 to 0.168 MPa). Increasing
normal load raised shear strength but also increased displacement (0 mm; 25 °C:
1.098 to 1.345 MPa; 1.780 to 4.550 mm). The failure envelope of 3 mm residue consistently lay below that of 0 mm. BISAR
analysis showed that full slip scenarios were more critical than full bonding.
SSR at 60 °C reached ? 1, indicating overlay failure, while MST 8 Ton remained
safe (SSR < 1>
Kata Kunci : BISAR 3.0, cat marka water-based, interlayer shear strength, overlay, stress-to-strength ratio
