A new dynamic apparatus for asphalt mix fatigue and stiffness modulus: development, validation and numerical simulations

The study encompasses various infrastructural amenities such as railways, roads, ports, bridges, tunnels, power plants, hospitals, municipal buildings, and other public-use facilities, which are essential for every country's economic growth. Recognizing the challenges faced by governments in independently providing all infrastructure components, Public Private Partnerships [PPPs] have emerged as a cooperative approach between the public and private sectors. This paper explores the risks, delays, key success factors, contractor selection, and best value selection models in construction project management. In addition, the paper emphasizes the challenges that governments need to address in order to ensure the efficient functioning of the BOT (Built Operate Transfer) network. The challenges in establishing an efficient BOT network are highlighted, and a decision-support system using the .Net framework is developed to aid in the prequalification and rating of BOT marketers. The purpose of this system is to provide the best value to the public procurer by employing regression analysis to rate bidders/applicants and utilizing a composite programming method based on relative weighting.

Section: Analysis Of Time Delaymentioning

confidence: 99%

Analyzing key success factors in public-private partnership BOT projects: an empirical study on financing influences, insights, and analysis in construction management

Krishnaraj,

Subbaiyan,

Viswanathan

et al. 2024

“…In summary, low-grade hard asphalt offers advantages such as rutting resistance, reduced pavement stiffness, and material savings. It can serve as an effective combination for high-modulus asphalt mixtures and long-life asphalt pavements [17,18]. However, further investigation is required to determine the low-temperature performance of low-grade asphalt mixtures.…”

Section: Introductionmentioning

confidence: 99%

Rheological properties and engineering application of low-grade asphalt mixture

Song,

Tu,

Xie

et al. 2023

This study investigates the feasibility of low-grade hard asphalt in high-temperature regions. We conducted an analysis of the high-temperature rheological properties of asphalt before and after short-term and long-term aging using the dynamic shear rheological (DSR) test and multi-stress creep recovery (MSCR) test. Additionally, the road performance of the asphalt mixture was studied by rutting test and low temperature beam bending test. The results indicate that the 30# asphalt demonstrates superior anti-rutting performance compared to the 50# asphalt. Furthermore, the rutting factor and fatigue factor of the 30# asphalt during aging are significantly higher than those of the 50# asphalt. With increasing temperature, stress level, and stress action time, the strain of the asphalt gradually increases. The unrecoverable creep compliance of the 50# asphalt exceeds that of the 30#. Although the high-temperature performance of the 30# asphalt mixture outperforms that of the 50# asphalt mixture, it exhibits lower flexural tensile strength and deformation ability at low temperatures compared to the 50# asphalt mixture. Overall, low-grade asphalt demonstrates relatively stable stress variations and exhibits good high-temperature stability.

“…In addition, the complex pore structure of PAC, which is a high-quality pavement material offering environmental protection and sustainable development capabilities, has been shown to effectively reduce temperature and noise [6,7]. However, the detrimental effects of industrial dust and damaged rubber particles, together with ever-greater vehicle loads [8][9][10], on PAC porosity involve gradually reducing permeability as pores become increasingly plugged with particles [11]. Therefore, after a period of service PAC loses some of its drainage and noise reduction properties, so it is necessary to regularly restore the porosity of PAC [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical pore-clearing method on infiltration rates of pervious asphalt concrete pavement

Zhao

Bai

et al. 2022

Pervious asphalt concrete (PAC) pavement is an environmentally friendly type of pavement due to its highly porous structure. However, with the increase in the service life of PAC, small substances such as damaged rubber particles, industrial dust, sand, and grease collected in rainwater infiltrate the voids of PAC so that it loses its original pervious structure and functions. In order to explore the effects of chemical pore-clearing methods on the infiltration rate of blocked PAC pores in the present study, chemical agents such as sodium hydroxide solution (H 2 O 2 ) and hydrogen peroxide (NaOH) solution were used to rinse the voids in PAC specimens obtained from field sampling and laboratory preparation. The effectiveness of different chemical pore-clearing methods in restoring the permeability and stability of PAC was evaluated by water infiltration rate measurements, Cantabro abrasion tests, and CT scanning. The results showed that the capability of H 2 O 2 solution to restore PAC porosity was greater than that of tap water and NaOH solution, especially when the H 2 O 2 content in the solution was 6%. In addition, the decomposition products of H 2 O 2 are oxygen and water, which are environmentally friendly products, this method proved highly effective in preventing groundwater contamination from pavement-cleansing chemical solutions.