Performance of Warm Mix Asphalt containing Sasobit®: State-of-the-art

The COVID-19 pandemic has resulted in unprecedented measures changing travel habits in many countries. Many users have started to prefer traveling by private cars, which is against the sustainability policies of the European cities. The necessity of gaining a deeper understanding of road users’ travel habit changes, their feelings on public transport use, and their perceptions of using sustainable urban mobility modes has emerged for future transport planning. Considering these facts, the study in this paper aimed to investigate the influence of the COVID-19 pandemic on road users’ perceptions, needs, and use of sustainable travel modes (i.e., public transport, walking, and cycling). An online survey was carried out during the period from March to May 2020 in the case study area, Sicily of Southern Italy. Regarding the population of the case study, the survey was representative, with 431 individuals. The survey included variables, namely gender, age, city of residence, private car ownership, walking and cycling frequency before and during the pandemic, public transport use frequency for leisure activities before and during the pandemic, need for remote working, and the stress and anxiety perception of using public transport during the pandemic. The analysis started with descriptive statistics and it was followed by correlation analysis in order to explore the characteristics of the dataset and relationship between variables. It was found that these were not statistically significantly correlated at a 95% confidence level. An ordinal regression model was applied for determining the predictions. The results suggested that women were less likely to walk during the pandemic than men. Participants were more likely to resume remote work even after the second phase in order to reduce their daily travel needs and keep their isolation. Participants have expressed a positive opinion on the use of micromobility during pandemic situations. These results can be considered as a basis for sustainable urban planning and a guide for decision-makers who aim to encourage the use of public transport, walking, cycling, and micromobility.

The Impact of COVID-19 Pandemic on the Resilience of Sustainable Mobility in Sicily

Morphology, thermal analysis and rheology of Sasobit modified warm mix asphalt binders

A factor that influences transit ridership but has not received much attention is weather. This paper examines the effects of weather on bus ridership in Pierce County, Washington for the years 2006-2008. Separate ordinary least squares regression models were estimated for each season, as weather conditions may have different effects depending on the time of year. Four weather variables were considered: wind, temperature, rain, and snow. High winds negatively affected ridership in winter, spring, and autumn. Cold temperatures led to decreases in ridership in winter. Rain negatively impacted ridership in all four seasons, and snow was associated with lower ridership in autumn and winter. These results suggest that adverse weather conditions can have a negative effect on transit ridership.

The Impact of Weather on Bus Ridership in Pierce County, Washington

This paper discusses the engineering properties of waste glass (WG), including its structural and environmental performance, as an alternative material for the construction of various types of paving systems, including asphalt, concrete, and block pavements. As a first step, an overview of the asphalt, cement, and glass manufacturing industries is provided. Then, a large volume of data is analyzed from various sources in the literature. Particular emphasis is given to laboratory studies of the structural performance and durability of WG. Additionally, the effect of WG on the field performance of the pavements is discussed. The sustainability of the pavements is also evaluated in terms of energy consumption, greenhouse gas emissions, safety, and the heat island phenomenon. In conclusion, the use of WG can improve various phases of pavement life and structure by enhancing the structural performance, durability, environmental friendliness, and aesthetic features of pavements.

Performance of pavements incorporating waste glass: The current state of the art

Summary of analysis of variance (ANOVA) for AI. Source Sum of squares df Mean square F p-Value Significant Corrected model 22.41 a 45 .498 16.01 <0.001 YesIntercept 407.07 1 407.07 13090.28 <0.001 YesM 8.05 1 8.05 259.07 <0.001 YesB 0.78 2 0.39 12.53 <0.001 YesS 2.44 2 1.22 39.25 <0.001 YesT 1.79 2 0.89 28.77 <0.001 YesM * S 1.87 2 0.94 30.10 <0.001 YesM* T 1.19 2 0.596 19.17 <0.001 YesB * S 0.43 4 0.11 3.50 <0.001 YesB * T 0.63 4 0.16 5.09 <0.001 YesS* T 1.28 4 0.32 10.31 <0.001 YesM * B * S 0.48 4 0.12 3.82 <0.001 YesM* B * T 1.21 4 0.30 9.78 <0.001 YesM* S * T 0.89 4 0.22 7.20 <0.001 YesB* S * T 0.49 8 0.06 1.99 <0.001 YesError 5.28 170 0.03Total 482.25 216Corrected total 27.69 215 a R Squared =0.81 (Adjusted R Squared 0.76), M: Method or type of rheological property; T: Temperature, B: Binder type; S: Sasobit ® content; *: Interaction. Figure 13. Relationship between the high failure temperatures of unaged (FT U ) and short-term-aged (FT

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Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures

Pedestrian level of service (LOS) is an overall measure of walking conditions on a route, path, or facility. This is linked directly to factors that affect mobility, comfort and safety, reflecting pedestrian's perceptions of the degree to which the facility is pedestrian-friendly. A unique model called FOOT-LOS (short for pedestrian footpath level of service) was developed to facilitate the LOS measurement. The factors considered fall into three categories; physical, location and user attributes. Pedestrian conditions can be described through a grading system, i.e. from LOS A (ideal pedestrian condition) to LOS F (unsuitable pedestrian condition), based on an assessment of the factors affecting LOS. The assessment includes desktop and on-site assessment of LOS factors. The development of the model involved an iterative process that included testing and refinement. The research undertaken and the LOS model developed provide a sound basis for the measurement of LOS for pedestrian footpaths. The model not only provides a methodology for determining LOS, but also determines which factors predominantly contribute to the LOS of pedestrian footpaths. © Owned by the authors, published by EDP Sciences, 2016 Language: en

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Pedestrian footpath level of service (FOOT-LOS) model for Johor Bahru

Incorporation of warm asphalt additives in conventional asphalt binder affects its rheological properties. This paper presents two Superpave™ binder parameters that were used to characterise the rheological properties of PG64 and PG70 asphalt binders blended with various Sasobit® contents and subjected to high and intermediate temperatures as well as under different ageing conditions. The parameters used to characterise the binder rheology at high and intermediate temperatures were the non-dimensional viscosity gradient (∇ η S ) and non-dimensional Superpave™ rutting parameter (NSRP), respectively). The results indicated that the ∇ η S trends differ depending on binder types, test temperatures and ageing conditions. The NSRP exhibited a significantly different trend for each Sasobit® content, depending on binder type and ageing conditions.

Parameters to characterise the effects of Sasobit® content on the rheological properties of unaged and aged asphalt binders

Pedestrians are most vulnerable of all road users. This research
aims to investigate and model pedestrian road crossing behaviour at
crossing facilities. In particular, they have two aspects of pedestrians
crossing behaviour are examined, namely the size of traffic gaps
acceptance by pedestrians and the decision of pedestrians either to cross
the road or not. A fields survey was carried out at six crossing facilities
which from a zebra crossing at midblock. In this survey, the data were
recorded in real traffic condition using video recorder. Determine the
associations between characteristics of pedestrians, crossing facilities and
vehicular traffic through on-site observations of pedestrian behaviour. This
data will analysis using statistical analysis which is multiple regression and
binary logit regression method. It is hope that through this research, the
model of pedestrian gap acceptance and pedestrian crossing decision can
be reached and what are the indicators that pedestrians look for when
accepting gaps to cross the road.

/pdf/analysis-of-pedestrian-gap-acceptance-and-crossing-decision-4g4e689jpk.pdf

Analysis of pedestrian gap acceptance and crossing decision in Kuala Lumpur

Presence of water in porous asphalt pavement may lead to adhesive failure at binder-aggregate interface and cohesive failures within the binder-filler mastic which attribute to stripping. This paper presents the effects of porous asphalt incorporating Sasobit ® prepared with hydrated lime and a newly developed anti-stripping known as Pavement Modifier (PMD). Specimens were compacted at various temperatures and tested on air voids, coefficient of permeability and the indirect tensile strength test (ITS) for dry and conditioned specimens. The resistance to moisture damage was determined from the ratio of dry and conditioned specimens. It was found that, specimens prepared with PMD exhibits better tensile strength and greater resistance to moisture damage at 125°C compared to specimens prepared with hydrated lime. The decreasing of compaction temperature significantly decreases ITS value but increased the air voids and coefficient of permeability. Increase of air voids resulted in a decrease of resistance to moisture damage. Therefore, incorporating PMD filler in porous mixes has improved moisture damage compared to those specimens incorporating hydrated lime.

Mohamad Yusri Aman

Papers

Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures

Pedestrian footpath level of service (FOOT-LOS) model for Johor Bahru

Parameters to characterise the effects of Sasobit® content on the rheological properties of unaged and aged asphalt binders

Analysis of pedestrian gap acceptance and crossing decision in Kuala Lumpur

Effects of Anti-Stripping Additives on Moisture Sensitivity of Warm Porous Asphalt Mixtures