Journal of Civil Engineering Beyond Limits (CEBEL)

Chotan Chowdhury Dr. Md. Kumruzzaman

The quantity of waste tires, an undesirable surplus, has been growing each year. The probabilities to take away scrap rubber tires to utilize these as a soil stabilizer, which increases the bearing strength of soil and also improved the bearing capacity of the soil. Trouble related to the socio-financial improvement of a rustic is waste tire decomposition. It has been a hard job to dispose of waste rubber tires safely. In this work, the opportunity of the usage of powder form of rubber tires as a supplement to enhance the shear strength of soft soil became evaluated. The bearing capacity of stabilized soils had been an advanced way of means of growing chances of crumb rubber. Besides this improvement, the effects of this kind of stabilizer and its distinctive portions on effluent traits also are analyzed. The addition of processed waste tires which are powdered form in each soil suggests acceptable adjustments in permeability. This research paper affords the improvement of soils the usage of fragmented waste tires at various proportions. The compressibility and unconfined compression strength of soil had been made use to measure the conduct & overall execution of the improved soils. Along with the test carried out with the soil Specimen, it became found, the highest dry unit weight and most efficient water content, material lower together with a boom in the proportion of stabilizer on soils. The value of shear strength increased with an increase in the proportion of mixtures and the highest values had been found at percentages of 5% & 15% for the specimens, S-1& S-2 severally.

https://doi.org/10.36937/cebel.2022.1567

Erfan Najaf Maedeh Orouji

In recent years, there has been significant progress in using FRP materials as masonry in civil engineering. In this regard, researchers have investigated the behaviour of reinforced beams with FRP and steel bars. One way to enhance these sections is pre-stressing FRP bars to increase the bending and shearing strength of sections. Reinforcing with a hybrid bar is a new method in which GFRP and steel bars are combined. In this research, first, the type of GFRP bars is determined, and then samples are pre-stressed. Samples are modelled using LSDYNA software. Bending and shearing failure modes of reinforced beams with FRP, GFRP, steel, and hybrid bars are analyzed, and finally load-displacement behaviour and crack width are compared. By studying bending and shearing behaviour and failure modes of the beam, we found out that using hybrid bars decreases the number of cracks Wider than 0.35 mm in the same displacement and greater loading capacity. By comparing load-displacement diagrams of samples, we conclude that the sample reinforced with hybrid bars has the best function. We can benefit from the anti-corrosion property of GFRP bars by arranging the reinforcements properly. the loading capacity can be increased of the sample by pre-stressing them about 65%, consequently, displacement of samples decreased.

https://doi.org/10.36937/cebel.2022.1542

Akaolisa, C.C.Z. Ofoh, I Okechukwu Agbasi Okoli, E.A. Okechukwu, S

Groundwater contamination near municipal garbage dumpsites was studied in Owerri, a city in southern Nigeria.The purpose of the study was to map aquifer contamination from landfill dumpsites within the Owerri metropolis and its environment using hydrogeochemical data. Groundwater samples were collected and examined at eight locations near landfill dumpsites. The result of the analysis shows that groundwater from the aquifers of all sampled locations is slightly acidic with an average pH value of 6.25. Bicarbonate, calcium and chloride have average concentrations of 26.19 mg/l, 4.25 mg/l and 0.26 mg/l, respectively. The results also show conductivity and total dissolved solids having an average value of 89.13 mg/l and 53.67 mg/l, respectively. These values fall within the maximum permissible Nigerian standards for drinking water quality and the World Health Standard for Drinking Water Quality. All the parameters did not exceed the NSDWQ (2007) standards except magnesium, which had a mean concentration of 1.16mg/l as opposed to the 0.20mg/l proposed by the Nigerian Standard of Drinking Water Quality. Also, future examination of the water resources within Owerri Metropolis should be done at least every two to three years by the government and relevant agencies to protect the health of people living within this environment.

https://doi.org/10.36937/cebel.2022.1571

Chotan Chowdhury Dr. Md. Zahid Husain Khan

Construction of highway embankments on soft clay soils is seriously crucial trouble for the serviceability of subgrade projects. It is a great concern to predict the settlement of the embankment on soft soil. Generally, Geotechnical problem is found where the soils are composed of soft clay. In this case, it is needed to predict the Consolidation settlement of clay. The prefabricated band drains are used for accelerating the consolidation of soft soils. During the Construction of high-way problems on soft soil, it is required to analyze stability related to the reduction of consolidation settlement. In this work, empirical methods of Prefabricated Vertical Drains (PVDs) & Preloading are used to analyze the settlement comprehensively. By the technique of preloading, consolidation of soil can be achieved to a considerable amount before applying of actual construction load. The result of the settlement analysis of the Highway Embankment in the research area is 248 mm, which takes almost 21 years for primary consolidations to achieve a 95% degree of consolidation. To reduce the duration of consolidation settlement Prefabricated Vertical Drains(PVDs)and Preloading are applied. The Kjellman formula is used for the estimation of the consolidation time. A triangular pattern is adopted in the depth of 19 m with a spacing of 1m and the reduced time for primary consolidation settlement is almost 120 days.

https://doi.org/10.36937/cebel.2022.1623

Erfan Najaf Hassan Abbasi Maedeh Orouji

In addition to absorbing much of the vibrational energy due to entering the plastic area, the dampers that give in to the Chevron brace will also prevent the braces from buckling like a fuse. Because the low stiffness of the damper impairs its performance and the excessive stiffness of the damper will cause the buckles to buckle, the lateral stiffness of the damper must be designed in the optimal state. Therefore, to increase the yielding damper's performance, the damper's geometric conditions should be defined so that most of it surrenders before local buckling. This paper uses ABAQUS finite element software to investigate circular, elliptical dampers and T-ADAS dampers in Chevron bracing. After examining the one-story frame, it was found that the TADAS damper had a better performance. Then an irregular 16-story structure equipped with a TADAS damping system under dynamic loading is investigated.

https://doi.org/10.36937/cebel.2022.1684