Investigation of the Construction Supply Chain Vulnerabilities Under an Unfavorable Macro-Environmental Context

Saeedi, Sarow; Koohestani, Kayvan; Poshdar, Mani; Talebi, Saeed

doi:10.24928/2022/0190

Cited by 4 publications

(1 citation statement)

References 18 publications

(21 reference statements)

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“…In the process of urbanization and construction [17,18], a large number of waste materials are produced, one of which is waste tires in the feld of automobile manufacturing [19]. Urban infrastructure is important to promote sustainable development [20][21][22]. Tese waste rubber materials are difcult to degrade naturally, and incineration and landfll will do some harm to the environment and also bring fnancial losses to societies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crumb Rubber on the Moisture and Rutting Behavior of Low-Energy Asphalt and Determining the Best Flow Number Model

Moghimi

Shafabakhsh

Divandari

2023

Advances in Materials Science and Engineering

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The advancement of technology and the increasing growth of environmental threats have led experts in the field of transportation to find alternatives for hot mix asphalts (HMAs). One of these alternatives is low-energy asphalt (LEA) mixtures. LEA mixture consists of hot asphalt binder and coarse aggregates and wet sand, which, having a lower mixing temperature, has caused a significant reduction in energy consumption and pollutants emitted from asphalt binder. According to previous studies, the influence of crumb rubber (CR) on the rutting and moisture performances of LEAs has not been investigated so far. In this regard, due to the softness of this type of asphalt mixture and its weakness against rutting and moisture, in this study, as an innovation, CR was used to modify LEA mixtures in three weight percentages of 10, 15, and 20. Considering the high moisture sensitivity of LEA mixtures due to the presence of water, the ability of CR to overcome this weakness and its potential to be replaced with antistriping additives were also investigated using the indirect tensile strength (ITS) test. In addition, in order to evaluate the rutting resistance, LEA mixtures were subjected to the dynamic creep test at a temperature of 54.4°C and at two stress levels of 270 and 310 kPa. According to ITS test results, it was found that although the modified LEA mixtures with 10 and 15% CR met the minimum requirement, the tensile strength ratio (TSR) value recorded for mentioned mixtures was still lower than that for HMA. Therefore, it is recommended to use antistripping additives in the use of LEA-containing CR, especially in areas with a high probability of moisture damage. The results of creep curves and flow numbers (FNs) extracted from four different models of three-stage, Fnest, Francken, and stepwise showed that although the LEA sample without additive had lower rutting resistance than HMA, the modification of this mixture to 15% CR significantly increased the rutting resistance. Moreover, considering the variety of variables in the process of making LEA compared to HMA, the comparison of FN determination models and the introduction of the most stable model were conducted in this research. According to the laboratory and statistical analysis results, it was found that the Francken model had less sensitivity to the variables, so it is suggested to determine FN for LEA mixtures.

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Section: Introductionmentioning

confidence: 99%

Effect of Crumb Rubber on the Moisture and Rutting Behavior of Low-Energy Asphalt and Determining the Best Flow Number Model

Moghimi

Shafabakhsh

Divandari

2023

Advances in Materials Science and Engineering

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Supply chain network design concerning economy and environmental sustainability: Crisis perspective

Abbasi,

Abbaspour,

Eskandari Nasab Siahkoohi

et al. 2024

Results in Engineering

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Organizational factors affecting supply chain vulnerability of building project

Nurisra,

Sugiarto,

Mubarak

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The project construction supply chain can be particularly vulnerable to disruptive events because of the dispersed nature of temporary project teams and the unpredictability of the operating environment. Supply chain vulnerabilities are the fundamental elements that leave the business subject to disruption. It is necessary to identify the vulnerabilities in the supply chain before attempting to improve its resilience. This study proposes to identify the primary causes of organizational vulnerability in the supply chain of construction projects based on these problems. The study focuses on medium-sized and large construction companies that work on building projects in Aceh Province between 2018 and 2022. This study used a data collection technique by distributing questionnaires to contractor companies involved in construction projects. The primary data collection was analyzed using descriptive analysis and the Relative Importance Index (RII) method. The results obtained show that management vulnerability is the main vulnerable factor in the organization of the supply chain of construction projects, with the highest index being delayed in information and decision-making with an RII value of 0.9118. The findings of this study may be useful to contractor firms in managing the construction project supply chain.

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Investigation of the Construction Supply Chain Vulnerabilities Under an Unfavorable Macro-Environmental Context

Cited by 4 publications

References 18 publications

Effect of Crumb Rubber on the Moisture and Rutting Behavior of Low-Energy Asphalt and Determining the Best Flow Number Model

Effect of Crumb Rubber on the Moisture and Rutting Behavior of Low-Energy Asphalt and Determining the Best Flow Number Model

Supply chain network design concerning economy and environmental sustainability: Crisis perspective

Organizational factors affecting supply chain vulnerability of building project

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