Chaturabong, Preeda

Preferred name

Chaturabong, Preeda

Main Affiliation

School of Engineering

preeda.ch@kmitl.ac.th

Now showing 1 - 10 of 15

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Evaluation of analysis methods of the semi-circular bend (SCB) test results for measuring cracking resistance of asphalt mixtures
(2019-09-01)
Mandal, Tirupan
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Ling, Cheng
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Chaturabong, Preeda
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Bahia, Hussain U.
This paper includes a large study to investigate the effect of different mixture design parameters (percent binder replacement, binder modification, low-temperature binder grade, aging, and mix design traffic level) on resistance to fracture using the Semi-Circular Bending (SCB) test at Intermediate Temperatures. The results show that the Jc parameter estimated from the SCB test cannot be directly related to the controlled parameters investigated in the study. Therefore, post-peak data analysis using the concept of Flexibility Index (FI) parameter from the Illinois Flexibility Index Test (I-FIT) is used in this study to analyze the data obtained from the SCB test. Statistical analysis (ANOVA and multi-linear regression analyses) are used to show which of the response parameters are statistically affected by mixture design factors. The study shows that although the SCB tests provide results that allow determination of various parameters such as Jc, peak load, FI parameter, and post-peak-slope, only the FI parameter can detect the effect of aging and show clear sensitivity to specific mixture design factors.
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Advanced characterization of bio-rejuvenated asphalt systems using agricultural waste pyrolytic oils: Integrated assessment of chemical composition, rheological, and aging performance
(2026-04-04)
Hutabarat, Multazam
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Chamwon, Suwaphit
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Chaturabong, Preeda
Reclaimed asphalt pavement (RAP) requires rejuvenation to restore binder flexibility lost due to oxidative aging. This study evaluated sugarcane bagasse oil (SBO) and rice straw oil (RSO) as bio-rejuvenators using an integrated chemical (GC–MS, FTIR), rheological (master curves), and mechanical (LAS fatigue) framework. GC–MS confirmed distinct feedstock chemistries—SBO enriched with methoxy-phenolics and aromatics, and RSO dominated by catechol, nitrogenous species, and oxygenated sugars—suggesting different rejuvenation pathways. FTIR results showed reduced sulfoxide index (SI) in fresh rejuvenated binders, indicating dilution of S O groups; however, changes in carbonyl index (CI) largely reflected the inherent bio-oil composition rather than true oxidative reversal. Several FTIR indicators therefore contrasted with rheological and fatigue behavior, demonstrating that chemical indices alone cannot fully describe rejuvenation or aging progression. Rheological master curves and LAS testing provided the decisive evidence of performance. Fresh rejuvenated binders exhibited substantial stiffness reduction and improved relaxation, with optimum dosages of ≈ 15% SBO and 10–15% RSO achieving 2–5 × higher fatigue life than aged binder at moderate to high strains. Following secondary aging (P-series), rejuvenation benefits were substantially diminished, with fatigue performance returning to aged-binder levels at most strain ranges. Only minimal-dosage formulations (5% SBO) demonstrated statistically significant protection against unprotected secondary aging (2AB, p < 0.05), while moderate-to-high dosages (10–20%) showed equivalent or inferior performance. FTIR indices revealed reduced sulfoxide formation in all P-series binders compared to 2AB, suggesting partial oxidation mitigation through alternative carbonyl-forming pathways, though this chemical protection did not translate to sustained mechanical performance. Thus, while hypotheses on feedstock-dependent chemistry and dose–response behavior were validated, sustained antioxidant protection from phenolics was only partially supported. In conclusion, chemical findings indicate potential rejuvenation mechanisms, but performance tests ultimately govern evaluation, and long-term durability will require hybrid formulations incorporating stabilizing additives.
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Rheological, adhesive, and chemical characterization of asphalt mastic modified with spent coffee grounds: A comparative study with limestone filler
(2026-06-01)
Thairueng, Manita
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Chamwon, Suwaphit
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Hutabarat, Multazam
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Chaturabong, Preeda
Spent coffee grounds (SCG) were evaluated as an organic filler in asphalt mastic at 10 %, 15 %, and 20 % by volume, benchmarked against limestone (LM). The experimental program combined DSR temperature sweeps, pull-off adhesion tests on basalt, granite, and marble substrates, SARA fractionation, and SEM, performed under fresh, RTFOT-aged, and PAV-aged conditions. At 20 wt% replacement, SCG reduced the complex shear modulus G* from 3637 to 2885 kPa at 16 °C (−21 %) and lowered the isostiffness temperature from 31.22 °C to 25.43 °C after PAV aging (−5.79 °C), while limestone at 20 wt% raised G* to 6461 kPa (+78 %). The rutting factor G*/sinδ decreased by 19–23 % with SCG and increased by 71–80 % with LM at 64 °C, whereas the fatigue factor G*sinδ at 25 °C dropped by 18–22 % with SCG, indicating improved fatigue resistance potential. Limestone mastics exhibited 25–83 % higher pull-off force than SCG ( p < 0.05, all 18 comparisons, Benjamini–Hochberg-corrected), yet SCG mastics maintained moisture retention of 83–97 % on basalt, comparable to LM (75–97 %). Failure mode analysis showed all mastics cohesive under dry conditions, with SCG transitioning to adhesive failure under moisture exposure (notably at 15–20 % SCG on marble and granite after PAV aging). SARA analysis confirmed aromatics rose from 60.6 % to 65.7 % and asphaltenes fell from 10.7 % to 8.2 % with increasing SCG, yielding an Instability Colloidal Index decrease from 0.187 to 0.154. These results establish SCG not as a direct limestone substitute but as a complementary modifier suited to fatigue-prone warm-climate binder courses and hybrid SCG–LM filler blends, offering environmental benefits through agricultural waste valorization.
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Rheological Performance of Asphalt Mastics Incorporating Shale and Pumice as Alternative Mineral Fillers
(2026-05-01)
Chamwon, Suwaphit
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Hutabarat, Multazam
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Chaturabong, Preeda
This study investigates the hypothesis that mineral fillers with distinct surface characteristics, mineralogical compositions, and morphologies exhibit different reinforcement mechanisms in asphalt mastics. Shale and pumice were evaluated as alternative mineral fillers and compared with conventional granite and limestone at 20% and 30% filler-to-asphalt (F/A) ratios by volume. Filler characterization included X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), specific surface area (SSA), and hydrophilicity coefficient (HC) measurements. Rheological characterization was performed using dynamic shear rheometer, including temperature sweep, frequency sweep master curves, multiple stress creep recovery (MSCR), linear amplitude sweep (LAS), and Glover–Rowe (G–R) analyses. Pumice, dominated by amorphous volcanic glass with the highest SSA (59.18 m²/g), exhibited rutting-dominant modification with the highest complex modulus enhancement (7.3–9.4 times at 30% F/A) and lowest non-recoverable creep compliance. Shale, composed primarily of quartz and kaolinite with layered morphology and moderate SSA (43.00 m²/g), demonstrated balanced rheological response and achieved the longest fatigue life (Nf,5% = 45,200 cycles at 20% F/A). These findings demonstrate that filler-specific reinforcement mechanisms are governed by mineralogical composition and morphology, supporting performance-based filler selection tailored to climatic and loading conditions.
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Evaluating the Effect of Curing Time and Resting Time on Moisture Damage Resistance of Asphalt Mixtures Using the Pull-Off Tensile Strength (POTS) Test
(2023-04-01)
Nimsanor, Adulwit
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Chaturabong, Preeda
This article explores the effectiveness of the Pull-off Tensile Strength (POTS) test as a tool for evaluating the moisture damage resistance of asphalt mixtures. Currently, indirect tensile strength (ITS) and the Hamburg Wheel Tracking (HWT) test are used, but they have limitations such as expensive equipment and being heavy. The POTS test is a low-cost and portable alternative. This study investigated the effect of curing time and resting time on the POTS of asphalt-aggregate systems by subjecting samples to different curing times and resting times before testing their tensile strength under dry and wet conditions. The results show that the tensile strength decreases with increasing curing time or exposure to water, indicating that the debonding process between asphalt and aggregates occurs more rapidly with aging. The tensile strength ratio (TSR) of the POTS test for all three asphalt binder types increases with resting time and curing time, with the highest values observed at a curing time of 2 h and a resting time of 5–15 min. Additionally, this study found a strong linear relationship between the tensile strength ratios of ITS and POTS tests, regardless of curing time and resting time. Overall, the POTS test is a promising alternative for evaluating moisture damage resistance in asphalt mixtures.
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Willingness-to-pay for estimation the risk pedestrian group accident cost
(2020-06-01)
Puttawong, Chompoonut
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Chaturabong, Preeda
The proven willingness-to-pay with contingent valuation (WTP-CV) method is an effective tool for evaluating the cost of road accidents in many countries. In Thailand, the most fatalities on Thailand’s roads involve the vulnerable road users (VRUs) including motorcycle users, bicyclists, and pedestrians. With the effectiveness of using WTP-CV in analyzing the accident cost of motorcycle users and lack of specific accident cost for pedestrians, this research focuses on evaluating the accident cost on the pedestrians which is the second most VRU fatality. In this research, the road accident cost of pedestrians aged 15-39 years in Bangkok by WTP-CV method was determined. The WTP-CV questionnaire was employed as a tool to measure the payment of which each pedestrian is willing to pay to reduce the fatality and injury risk from road accidents. One thousand and two hundred pedestrians in Bangkok were interviewed. With the results, the value of statistical life (VOSL) for pedestrians in Bangkok is valued at US$ 0.43 million, while the value of statistical injury (VOSI) is estimated at about US$ 0.014 million, respectively. In addition, it is found from the regression analysis that for the fatality risk reduction, higher educational levels and private business pedestrians are likely to pay more to save their lives. In order to reduce the risk of injury, respondents, who are single in marriage status, are likely to pay more to reduce the risk of pedestrian injury. However, a high perception of safety is less likely to pay for the reduction of injury risk.
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Decoupling Chemical Composition from Viscoelastic Recovery in Rejuvenated Asphalt Binders
(2026-04-01)
Hutabarat, Multazam
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Chamwon, Suwaphit
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Chaturabong, Preeda
This study investigates the decoupling between bulk chemical composition and high-temperature viscoelastic recovery in rejuvenated asphalt binders. A pressurized aging vessel (PAV)-aged binder (AC60/70) was rejuvenated using pyrolytic bio-oils from sugarcane bagasse (SBO) and rice straw (RSO) at 5–20 wt% dosages. SARA fractionation, colloidal instability index (Ic), penetration, and multiple stress creep recovery (MSCR) testing at 0.1 and 3.2 kPa were conducted before and after a rolling thin film oven (RTFO) aging. Both bio-oils restored SARA fractions to nearly identical levels (Ic = 0.541– 0.572), yet penetration diverged substantially (79 vs. 36 dmm at 20% for SBO and RSO, respectively). After RTFO aging, MSCR responses converged across all formulations regardless of pre-aging differences, yielding identical an Equivalent Single Axle Load (ESAL) classification. This convergence is attributed to selective volatilization of low-molecular-weight bio-oil components during thermal conditioning, consistent with findings from a companion rheological–fatigue study. The results reveal a fundamental decoupling: bulk chemical indices, while useful for compositional assessment, do not correspond to stress-dependent viscoelastic recovery mechanisms governing rutting resistance. Performance-based rheological testing is therefore essential for reliable evaluation of rejuvenated binders under field-relevant conditions.
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Willingness to Pay for Active Mobility Infrastructure in a Thai University: A Mixed-Methods Analysis of User Preferences and Policy Implications
(2025-08-01)
Meesit, Ratthaphong
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Puntoomjinda, Shongwut
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Sontikul, Sumethee
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Arunnapa, Supattra
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Hutabarat, Multazam
This research examines road users’ willingness to pay for enhanced active mobility infrastructure at King Mongkut’s Institute of Technology Ladkrabang (KMITL), a suburban university campus in Bangkok, Thailand. The study addresses the need for sustainable transportation solutions in middle-income urban environments by analyzing factors that influence walking and cycling adoption among university community members. The research employed a comprehensive mixed-methods framework combining qualitative SWOT analysis, a stated preference survey of 400 participants, and regularized logistic regression modeling with cross-validation. The analysis revealed that specific infrastructure improvements significantly increase the likelihood of active mobility adoption. Rest areas demonstrated the strongest positive association (OR = 2.15, 95% CI: 1.08–4.27, p = 0.029), followed by CCTV security systems (OR = 1.89, 95% CI: 0.98–3.65, p = 0.047), and improved public transport connectivity (OR = 2.84, 95% CI: 1.42–5.68, p = 0.003). Demographic analysis uncovered notable resistance patterns, with male participants (OR = 0.48, 95% CI: 0.26–0.89, p = 0.020) and higher-income individuals showing reduced willingness to transition from motorized transportation. Using the Contingent Valuation Method with proper bias mitigation strategies, the study quantified potential behavioral changes, projecting a 12–18 min daily increase in active mobility engagement. This enhancement would generate measurable health benefits valued at 2840–4260 THB per person annually using WHO-HEAT methodology. The research contributes valuable insights to the limited body of active mobility literature from Southeast Asian suburban contexts, providing a replicable framework for similar investigations.
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Mineral filler characteristics and non-Newtonian viscosity of asphalt mastic at high temperature: A response surface methodology approach
(2026-12-01)
Chamwon, Suwaphit
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Hutabarat, Multazam
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Chaturabong, Preeda
Asphalt mastic—composed of asphalt binder and mineral filler—strongly governs the high-temperature viscosity of asphalt concrete during mixing and compaction. This study investigates the effects of four mineral fillers (granite, limestone, shale, and pumice) on the viscosity and flow behavior of asphalt mastics at elevated temperatures (130–170 °C). Comprehensive filler characterization was performed, encompassing morphological analysis by scanning electron microscopy (SEM), physical property evaluation (particle density, specific surface area, and Rigden voids), hydrophilic coefficient determination, particle size distribution by laser diffraction, and mineralogical identification by X-ray diffraction (XRD). Response surface methodology (RSM) with a central composite design (CCD) was employed to model the combined effects of temperature (130–170 °C), filler content (5–30% by volume), and rotational speed (10–30 RPM) on apparent viscosity measured by a Brookfield rotational viscometer. The non-Newtonian index, derived from the power-law (Ostwald–de Waele) model, was used to classify flow behavior. Results demonstrate that temperature and filler content are the dominant parameters governing viscosity, while rotational speed controls the degree of non-Newtonian behavior in a filler-dependent manner. A critical transition from quasi-Newtonian to pronounced non-Newtonian flow was identified at 15–20% filler content by volume, coinciding with a sharp increase in the effective solid volume fraction that approaches the colloidal packing threshold (φ* ≈ 32–34%). Pumice exhibited the strongest shear-thickening (n up to 1.22) while granite showed consistent shear-thinning (n ≈ 0.88–0.94), with limestone and shale showing mixed behavior. Pumice and shale produced the strongest viscosity stiffening, consistent with greater binder immobilization due to their higher Rigden voids. AASHTO T316 workability analysis indicates that under base-binder conditions, the maximum filler content within practical mixing limits at 160 °C is approximately 30% for granite and limestone but only ∼22% for pumice. The validated quadratic RSM models (R² = 0.84–0.96) provide a practical framework for optimizing filler selection and processing temperatures in asphalt mixture design.
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Evaluation of using natural fillers to improve moisture damage resistance and the use of pull-off tensile test in determining moisture damage resistance in asphalt mixture
(2020-06-01)
Rachabut, Kroekphon
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Chaturabong, Preeda
Moisture is one of the critical failures affecting asphalt pavement. It has been recently found that moisture created by rainwater and undrained water deteriorate the bonding interface between asphalt mastic and aggregate. Using different mineral fillers can lead to different moisture resistance in the same mix design. Nowadays, waste natural materials allow agriculturists to receive more income by recycling in many industries. In this study, the researchers adopted bagasse and coconut peat grinding into very fine particle passing through the sieve number 200 (0.075 mm) to replace the mineral fillers. Although the indirect tensile strength (ITS) test is commonly used for evaluating the moisture damage resistance of hot-mix asphalt (HMA) in a laboratory, there are some shortcomings in using this test, such as costly, heavy and indirect equipment. Another potential test that is likely to be more advantageous than the ITS test for evaluating the moisture damage resistance is the pull-off tensile strength (POTS) test. However, it is typically measured on a concrete surface, and no results using an asphalt mixture have been reported. The objectives in this study were to investigate the effects of waste natural fillers in asphalt mixture on adhesive bonding caused by moisture, and to determine whether the POTS test is a potential method in measuring moisture damage resistance in a laboratory. Results showed that the tensile strength ratios (TSR) of asphalt mixture with bagasse and coconut peat fillers are approximately equivalent to those with mineral fillers. Results also showed that asphalt mixtures with bagasse and coconut peat fillers can effectively prevent the moisture damage resistance. In addition, with the preliminary result, it was found that the POTS test showed a very good R square (R<sup>2</sup>) for a relation of TSR with the ITS test. As a result, the POTS can be a valid tool of quantifying moisture damage resistance with better simulating to field behavior, lower cost of equipment, and light weight.

Chaturabong, Preeda

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