Journal of Civil Engineering Beyond Limits (CEBEL)

Chotan Chowdhury Ashok Kumar

In this paper, description of the results of a study which was primarily directed to the determination of shear strength behaviour of coal mine waste stabilized by cement, lime and fly ash. The mine is found at Parbatipur upazila in Dinajpur, this is often the as it were dynamic mine in Bangladesh. Mining workplaces opened in Dhaka and exchange was helped by British Rail arrange in India. In 1962 the study found 1.05 million ton of coal in Jamalganj, Sunamganj Locale. The another huge revelation came in 1985 when Geographical Overview of Bangladesh found coal in Dinajpur. Bangladesh has an assessed 2 billion tonnes of coal in underground saves within the Northwest locale of the nation. Fine coal waste obtained from Barapukuria to ascertain its suitability for use as a construction material. Coal mine waste samples were stabilized by treating with cement, lime and fly-ash mixtures. In the present investigation, laboratory test of Triaxial tests were conducted on waste samples added with various percentages of cement, lime and fly-ash by the weight of dry waste. It was observed that addition of about 1%, 3% and 5% cement, lime and fly ash to coal waste, increased the shearing strength significantly. The fine coal waste, alone or with cement, lime or fly ash admixtures, possesses acceptable strength characteristics. It appears from the test results that the fine coal waste used in this study can be properly stabilized for use in construction of highway subgrades.

https://doi.org/10.36937/cebel.2022.1744

Md Mahabub Rahman Md Harun Ar Rashid Md Humayun Kabir Razib Ahmed

This research investigates the characteristics of organic soil from southwest Bangladesh and the influence of sand columns on the void ratio (v_0), consolidation coefficient (c_C), and volume compressibility (c_V) of stabilized soil. On the laboratory scale, cylindrical columns of varying diameters were extruded through organic soil samples and stabilized with 3%, 5%, 8%, 10%, and 23% sand in various geometries. After evaluating the engineering parameters, a series of 1-D consolidation experiments were performed to assess the effect of the sand column on stabilized soil samples. According to the Unified Soil Classification System (USCS), the organic soil used in this research is defined as organic silt (OH). According to the findings, the organic soil has a liquid limit of 118% and its particles pass through a 0.075 mm sieve. By incorporating sand columns, rapid consolidation was obtained, and the sample containing 77% organic soil and 23% sand exhibited the best consistent compressibility features. The effects of column number and geometry on the compressibility behavior of organic soil samples were also examined. The results for the 77% organic soil and 23% sand in a single column and the 82% organic soil and 8% sand in a double column are nearly identical. This study reveals that stabilization with sand columns may significantly enhance the physical and consolidation behavior of organic soil in southwest Bangladesh.

https://doi.org/10.36937/cebel.2022.1731

MELEK AKGÜL ORHANGAZİ ODACIOĞLU ORHAN DOĞAN

Concrete has been used in the construction industry for many years as a building material. Concrete and reinforced concrete, which have a wide range of usage areas from bridges to highways, from buildings to utility poles, from sewer lines to treatment and production facilities, also have a significant economic importance. In addition to its many advantages, concrete, which is a brittle building material, needs the use of reinforced concrete steel that supports its ductility feature. Reinforced concrete; It is based on a good adherence relationship between concrete and reinforcement and is also under the influence of different abrasive environmental conditions, especially the loss of adherence and cross-section in reinforcement compared to concrete elements. There are many academic and sectoral studies on the determination of the adherence relationship in reinforced concrete. In this compilation study, the results of many studies were brought together and information about the adhesion tests between reinforcement and concrete, which are widely used, are given. Since the pull-out test method using lolitop core samples required was used for the adherence values in the analyses, this test method was also preferred in the literature studies. However, the usability of the reinforcement pull-out test is very harmful, difficult and limited in determining the adherence value of existing structures. For this reason, since it is a very convenient method to use the push-out method on the reinforced core sample, determining the relationship between these two methods will make a great contribution to many studies on strengthening existing buildings.

https://doi.org/10.36937/cebel.2022.1765

Elif Meriç İlkimen Turan Akar Ali Aydın

This study, it is aimed to determine how soil parameters affect mass movement. The study area was carried out in the Şirinköy District of Merkezefendi District of Denizli. As a basis for the prevention of mass movements; Geophysical methods are of great importance in terms of determining and monitoring the properties of the sliding forces by determining the ground conditions in the region. For this reason, in this study, the characteristics of the mass movement were determined by determining the soil properties of the study area by using the seismic multi-channel surface wave (MASW) method, which is one of the geophysical methods. With the MASW method, it was determined that the seismic velocities of the area were lower than 910 m/s. As a result of the MASW studies carried out in the study area, the ground class is ZC according to the 2018 earthquake regulations; Very tight sand, gravel and hard clay layers or weathered, very cracked weak rocks ZB; It can be defined as slightly weathered, moderately strong rocks. Removability values according to Vp wave velocity were evaluated as Medium for the first layer, and Difficult/Extremely Difficult for the second layer. The Vp/Vs ratio of the area changes as Layer 1 Loose/Solid/Tight-Solid/Strong, Layer 2 Loose/Very Loose. The boundaries and units of the geological formations of the ground in the region have been determined. Limestone and fill surface slip surfaces in the area were observed in MASW sections. By evaluating all these studies together, the mass movement in the region was determined as slow flow (creep).

https://doi.org/10.36937/cebel.2022. 1767

Mohammad Saber SADID Zeynep Yaman Mohammad Manzoor Nasery

The strong column-weak beam principle, one of the earthquake resistant building design theories, require the connection area to be strong enough so that the plastic hinge forms in the beam. One of the proposed solutions is to strengthen the column-beam connection zone in steel connection with haunches. This study aims to look at parametrically behavior of column-beam haunched connections under the 100mm vertical displacement controlled loading using the finite element method. To obtain this, a total number of 21 finite elements model with 15, 30, and 45 degrees angles and 6 various stiffener types has been modeled by ABAQUS software. The research later discussed behavior of underlying components of haunch connections models such as the load-displacement curve, bearing capacity, extended end plate bending, stress distribution, and the position of the plastic hinge's development after finite element analysis. The study found that decrease in haunch angle improve the connection's bearing capacity, while in this case, the failure modes and plastic hinges will occur close to the joints which does not meet the code requirements. The article concludes that the 30-degree haunch angle is the most appropriate one in haunch connection and the three parallel and K-stiffeners is the most suitable reinforcement type for the haunched connections.

https://doi.org/10.36937/cebel.2022.1777