Assessing Suitability of Delibina, Hamessa and Kayle Rivers Sand for Structural Concrete, Southern Ethiopia
Evaluation of Material Consumption and Cost Efficiency in RCC Intze Tanks: Is Vs. ACI Design Codes
LULC Change Detection and its Impact on Storm Water Runoff using RS and GIS: A Case Study of Dahisar, Mumbai
Sustainability of Bio-Concrete in Marine Waters
Performance Enhancement of RC Structures through Concrete Jacketing: A Structural Rehabilitation Approach
Study on Strength Properties of Lightweight Expanded Clay Aggregate Concrete
A Step By Step Illustrative Procedure to Perform Isogeometric Analysis and Find the Nodal Displacements for a Two Dimensional Plate Structure
Lateral - Torsional Buckling of Various Steel Trusses
A Step by Step Procedure to Perform Isogeometric Analysis of Beam and Bar Problems in Civil Engineering Including Sizing Optimisation of a Beam
Comparative Study on Methodology of Neo-Deterministic Seismic Hazard Analysis Over DSHA and PSHA
Investigation on the Properties of Non Conventional Bricks
Analysis on Strength and Fly Ash Effect of Roller Compacted Concrete Pavement using M-Sand
Investigation on Pozzolanic Effect of Mineral Admixtures in Roller Compacted Concrete Pavement
Effect of Symmetrical Floor Plan Shapes with Re-Entrant Corners on Seismic Behavior of RC Buildings
Effect of Relative Stiffness of Beam and Column on the Shear Lag Phenomenon in Tubular Buildings
Sand with impurities creates cracks and failure of structural concrete, which leads to loss of investment, lives, and injuries. The objective of this study was to assess the suitability of Delibina, Hamessa, and Kayle rivers' sand for structural concrete. 18 sand samples were collected by using BS 812 standards per depth and stream stations, and 126 concrete (C-30) specimens were cast with constant quality of concrete ingredients but sand with impurities. The standards testing methods used in this study were ASTM, ACI, BS 882, IS, and the Ethiopian standard for testing sand properties and impurities. The results of this study indicated that 66.67% moisture content of sand was a suitable value per depth and stream station, whereas the silt content and clay content of sand were 50%, 11.11%, 33.34%, and 27.78% passed per stream station and per depth, respectively. The particle size distribution of sand was 62.5% coarser and 37.5% fine sand per six stream stations, while the specific gravity, water absorption, and loose and compacted unit weight of sand were 100% past the limit. The organic impurities of sand per depth had 11.11%, 72.22%, and 16.67% darker, lighter, and colorless than the standard solution, respectively. The slump and unit weight of fresh concrete was 66.67% acceptable for normal concrete, whereas the compressive strength at 7 and 14 days was 75%, and at 28 days, 100% passed the limit. The study concluded that the quality of Delibina River sand was better than Hamessa and Kayle rivers' sand, and it recommended that Delibina, Hamessa, and Kayle River sand source users have to wash, dry, and screen sand before use.
This paper explores the structural design of RCC Intze water tanks through a comparative approach using two prominent international design standards: the Indian Standard (IS 3370) and the American Concrete Institute (ACI 350) code. Elevated water tanks, particularly those of the Intze type, are vital for ensuring a dependable water supply in both urban and rural settings. Their unique configuration, featuring a cylindrical body with a conical base, enhances load distribution and promotes material efficiency. In this study, STAAD.Pro software was employed to model the tank and perform structural analysis under various load conditions, including gravity, hydrostatic pressure, and wind forces. The findings reveal notable differences in reinforcement detailing and concrete usage between the two codes. Designs based on the ACI code demonstrated a slight reduction in steel requirements, indicating potential material savings. Overall, the study offers insights into how code selection can impact design outcomes, enabling engineers to make informed decisions based on cost, safety, and regional practices.
This study provides a technical analysis of Land Use and Land Cover (LULC) changes and their impact on stormwater runoff in Dahisar, Mumbai, India, from 2003 to 2023. Utilizing high-resolution Landsat satellite imagery processed through Remote Sensing (RS) and Geographic Information System (GIS) techniques, significant urban expansion is observed, with built-up areas increasing from 40.40% to 58.60%. Despite these changes, there was no significant increase in water bodies. The study identifies a peak stormwater discharge of 1433.44 cubic meters per second, attributed to the rise in impervious surfaces caused by urbanization. This research offers crucial insights into the challenges of rapid urbanization in coastal megacities like Mumbai, where climate change intensifies the risks associated with extreme weather events. The study highlights the urgent need for adaptive urban planning that incorporates sustainable practices, such as green infrastructure and resilient water management systems, to effectively mitigate flood risks and manage stormwater runoff. These findings are particularly significant for policymakers and urban planners, stressing the importance of addressing environmental and hydrological challenges in rapidly urbanizing coastal regions.
This research explores the sustainability of bio-concrete in marine environments, focusing on its workability, compressive strength, and self-healing capabilities compared with conventional concrete using Bacillus subtilis bacteria. A total of 27 cubes were cast to study compressive strength and the self-healing mechanism of bio-concrete. Samples were cured in both normal water and marine water. After 28 days of curing, microcracks were induced in the cubes by applying one- third of the load, and the specimens were then exposed again to normal and marine water to evaluate healing. The findings demonstrate a compelling self-healing mechanism, with bio-concrete showing remarkable recovery in both curing conditions. Notably, the healing process was faster and more efficient in marine water, highlighting the adaptability of bio-concrete in harsh environments. Overall, the study emphasizes bio-concrete as a sustainable alternative for marine infrastructure, offering improved workability, enhanced compressive strength, and efficient self- healing, thereby contributing to the durability and resilience of coastal structures.
Concrete buildings are facing some serious issues around the world. There are a few reasons for this, natural disasters such as earthquakes, lack of knowledge about important building codes, and poor supervision during construction. Because of these problems, many buildings are weaker than they should be. If these structures are under too much weight, they can bend and corrode, which means immediate repairs are needed. To tackle these problems with reinforced concrete, repair and strengthening methods have become really important in construction today. Even new buildings sometimes end up needing fixes because of design mistakes or problems during building. Structures that have been damaged by unexpected events like fires or earthquakes need special techniques to make them strong again. Fixing up buildings helps protect them from earthquakes and reduces the risk of damage. It's all about boosting a building's strength to meet safety standards. Many studies have looked into effective ways to reinforce them. This paper will take a brief look at some new and cost-effective methods for repairing damaged buildings.
