Journal of Civil and Environmental Engineering

ISSN: 2165-784X

Open Access

Current Issue

Green building technology: sustainable civil engineering design and construction (2020)

    Research Article Pages: 1 - 11

    Implementing an Urban Bicycle Highway on Pedestrian Traffic - Finding a Traffic Control Strategy with Optimal Coordination for the City Center of Munich

    Arifin Islam and Tasminur Mannan Adnan

    Bicycle highways are specially designed infrastructures allowing cyclists to travel at a considerable speed through different environments. These elements in densely built urban areas are difficult to understand, since many requirements and standards need to be met. Serving all modes of traffic with acceptable efficiency and implementing a bicycle highway design is a challenge and therefore the aim of this study is to define a strategy for bicycle road traffic control in an urban area, the city center of Munich, which will improve its traffic efficiency. The current situation of the studied area was developed in PTV VISSIM to achieve the objective. Firstly, the base model was calibrated and validated to match the present state and synchronized separately for bicycles and cars. Five alternative models were developed based on coordinating and developing the bicycle highway infrastructure. Attempts were made to compare the models on efficiency measurements and the models were evaluated to analyze traffic safety parameters. In this assessment, interaction between pedestrians and bicycles was given priority. The research result shows improvement of the traffic efficiency of bicycle highways within the alternatives proposed. The loop pause time decreased up to 7%, the number of stops decreased by 28%, bicycle travel time has been reduced up to 7%. The results of this research show improvement of the traffic efficiency of bicycle highways within the alternatives proposed.

    Research Article Pages: 1 - 6

    Effects of Partially and Totally Substitution of Marble Waste as a Fine Aggregate on Workability and Mechanical Performance of Concrete

    Jawad Ahmad, Aneel Manan, Asif Ali, Talha Ihsan M, Osama Zaid and Rahat Ullah

    It has been recommended that; the disposal of industrial waste would be greatly reduced if it could be incorporated in concrete production. One of these possibilities is the substitution of the fine aggregate by marble waste (MW), which contributes to the reduction of natural resources consumption, while solving a waste management problem. The basic objective of this investigation is to examine the characteristics of concrete using MW as fine aggregate in proportions 0%, 20%, 40%, 60%, 80% and 100% by weight of cement. Several fresh and harden properties have been reviewed in the current paper. The results observed from the various tests depict that increase the slump value with the increase the percentage level of MW. Moreover, strength was increase up to 60% substitution of MW and then decreases gradually. Therefore, it is recommended to MW as fine aggregate up to 60% substitution.

    Research Article Pages: 1 - 8

    Suitability of Crushed Manufactured Sand for Replacement of Natural River Sand to Produce C-25 Concrete

    Dessalegn Mamaru

    The global consumption of natural sand is very high, due to the extensive use of concrete or mortar. The fine and coarse aggregates generally occupy 60% to 75% concrete volume (70% to 85% by mass) and strongly influence the concrete’s fresh and hardened properties. Now a day’s sand is becoming a very scarce material. Natural sand deposits are being depleted and causing serious threats to the environment and society. The culture of using alternative ingredients to produce materials is weak in Ethiopia. Around Jimma town, quality sand is not readily available and it is transported from Worabe, Gambella, and Chewaka that needs high transportation costs. In this situation, research began for an inexpensive and easily available alternative material to natural sand. The main objective of this study was aimed to determine the fresh and hardened properties of C-25 concrete by replacing natural sand with manufactured sand in Jimma town. This experimental study was conducted by preparing three concrete cubes for each percentage replacement. The replacement was done at 0%, 10%, 20%, 40%, 60%, and 100%. According to this study, the slump values for the above percentage replacement were 48.91 mm, 45.23 mm, 38.98 mm, 32.56 mm, and 26.14 mm respectively. The compressive strengths were 27.08 MPa, 29.34 MPa, 31.25 MPa, 27.25 MPa, and 29.22 MPa, and the flexural strengths were 3.28 MPa, 3.35 MPa, 4.37 MPa, 3.26 MPa, and 4.26 MPa respectively. The maximum compressive strength was obtained at 40% replacement with the corresponding compressive and flexural strengths were 31.25 MPa and 4.37 MPa respectively. From this result it is concluded that manufactured sand can be used as natural sand partial and fully replacement

    Research Article Pages: 1 - 8

    Impact of Indoor Physical Environment on Employee Productivity after Pandemic Period the Case of Arab Bank Jordan

    Mohammad Mahmoud Mraweh Alkhatib and Parastoo Pourvahidi

    Corona virus has changed the way of life and generally effects the expectations of employees in what they expect from office environments while they are returning to the physical office. Since, their time in the office is limited after the pandemic and most of the workers should be in office on rotation, therefore worker in the partial of time should have maximum productivity. One of the major determinants of employee productivity is the indoor physical environment. Today, organizations can improve their outcomes significantly when adequate attention is paid to promote the indoor workplace environment. This research aims to examine the effect of the workplace environment on the productivity of employees working in the ARAB bank in Jordan. Primary data was used in a form of self-reporting questionnaires distributed to 382 employees of ARAB bank in Jordan, 322 were analyzed using the version 26 of SPSS software. Outcomes of the research reveal that the indoor environment has a compelling impact on the employees' self-assessed productivity. The research is carried out during the Corona virus pandemic hence it is shared that most employees were working from home during the data collection phase.

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