بحوث سكوبس — عبد الهادي متعب حسن السعدي

An innovated engineering management platform has been adopted to limit the factors affecting epidemics spread, predicting future infection, and development of crowded, healthy, smart, and self-sufficient (HSSS) cities. The platform has proven to be effective in redesigning the city's infrastructure structure according to a developing city and the international standards of HSSS city to insuring a minimum number of infections. The platform itself is based on Weka Software and generalized extreme value distribution for prediction missing historical data of the case study (Covid-19 in Hillah city, mid-Iraq). The output results reveal that the percentage decrease in the number of infections of developing city scenario was between 39.3% - 100% on Jan and between 6.5% - 25.7% on Jul in the year 2030. While for HSSS scenario, the percentage decrease in infections number was found between 60.3% - 100% on Jan and 30.5% - 75.2% on Jun. The findings are that the infections number reducing is mainly depended on the possibility of infrastructures reframing and climatic conditions which are unfortunately uncontrollable. © 2024 American Institute of Physics Inc.. All rights reserved.

Using the ABAQUS software, this article presents a numerical investigation on the effects of various stud distributions on the behavior of composite beams. A total of 24 continuous 2-span composite beam samples with a span length of 1 m were examined (concrete slab at the top and steel I-section at the bottom). The concrete slab used is made of a reactive powder concrete with a compressive strength of 100.29 MPa. The total depth of each sample was 0.220 m. The samples were separated into four groups. The first group involved 6 specimens with shear connectors distributed into 2 rows with different distances (65, 85, 105, 150, 200, and 250 mm). The second group had the same spacing of shear connectors as the first group except that the shear connectors were distributed with one row along the longitudinal axis. The third group consisted of six specimens with single and double shear connectors distributed along the longitudinal axis. The fourth group included six specimens with one row of shear connectors arranged in a staggered distribution along the longitudinal axis. Results show that the optimum spacing was 105 mm in all groups and the deflection in group four fluctuated up and down due to the non-symmetrical distribution of the shear connectors. © 2022 Yasar Ameer Ali et al., published by De Gruyter.

Geotextile reinforcement techniques have been widely used in paving works around the world and have proven to be effective in improving pavement performance. This study has focused on using different positions and numbers of geotextile reinforcement sheets between the layers of flexible pavement for rutting reduction. Fitting depth was measured in the field at seven constructed sections of the pavement of the road model. Each section has been strengthened with different reinforcement approaches. All road sections were subjected to a maximum load repetition of 10,000 cycles. The results indicate that using three layers of geotextile beneath each course of the designed road pavement sections (surface, binder, and base) reduced rutting by 96%. Traffic benefit ratio (TBR) has been employed in this study to reveal the behavior of geotextile reinforcement in increasing the service life of the road. TBR values are the load cycling ratio between the reinforced and unreinforced section for the exact recorded rut depth, it has been found to be minimally equal to 4 for the case of using one layer of reinforcement at interface I, and that value keeps growing up for other reinforcement cases. © 2022 Abdul Hadi Meteab AL Sa'adi et al., published by De Gruyter.

As cement production causes 7% to 8% of global carbon dioxide emissions, many efforts have been made to reduce the consumption of cement. Using pozzolan (usually fly ash) as additional material with cement is one of these methods. In this paper, the impact of adding Nano fly ash as a partial substitution of cement weight was studied in self-compacting concrete for rigid pavement. Three replacement ratios were used which are (5,10 and 15) % of cement weight. The results showed that the greater substitution ratio gave better workability with higher d slump flow value and better passing ability of concrete. Also, the use of Nano fly ash improved the mechanical properties of the self-compacting concrete by increasing the compressive and splitting tensile strength. The best increase in the strength at the replacement ratio (10%) of cement weight. The slump flow for concrete mixes is between (658 to 732) mm and the compressive strength was improved with the increase of Nano fly ash replacement (10%) by about (20%) compared with conventional concrete. The rigid pavement strength able to provide a surface of good riding quality. © Published under licence by IOP Publishing Ltd.