i-manager's Journal on Civil Engineering (JCE)


Volume 10 Issue 3 June - August 2020

Research Paper

Synthesis of Kudremukh Iron Ore Tailing Based Geopolymer Coarse Aggregate using Fly-Ash as Precursor in the Construction Industry

Guruba Savaraja H.* , Sunil C. L. **, H. K. Ramaraju***
*-**** Department of Civil Engineering, Dayananda Sagar College of Engineering, Bengaluru, Karnataka, India.
Savaraja, H. G., Sunil, C. L., and Ramaraju, H. K. (2020). Synthesis of Kudremukh Iron Ore Tailing Based Geopolymer Coarse Aggregate using Fly-Ash as Precursor in the Construction Industry. i-manager's Journal on Civil Engineering, 10(3), 1-6. https://doi.org/10.26634/jce.10.3.17526

Abstract

Fact that the large-scale dumping of the mining and industrial waste causes various environmental impacts and health issues in human and animals. It is necessary to use the wastes in an effective manner to prevent such environmental problems. Fly ash and iron ore tailings are the two major wastes of such kind. Even though these two wastes are being used in various sector, the utilization of these waste is less than the waste generated. This study mainly concerns with the usage of fly-ash and iron ore tailings in construction industry in sustainable manner. Geopolymer coarse aggregates are synthesized by using the fly-ash and iron ore tailing with alkaline activator solution which activates geopolymeric source. The cubes of side 75 mm x 75 mm x 75 mm are prepared by mixing fly-ash and IOT in 70:30 proportion respectively with varying molarity of alkaline activator as 6M, 8M, 10M up to 12M. Compression test are carried out on the prepared cubes. It has been observed that as the molarity of alkaline activator increases, the compressive strength also increases. 10M of Alkaline activator is used for the synthesis of geopolymer coarse aggregates. Aggregates are prepared by crushing of cubes. XRD and SEM analysis are preferred for the characterization of raw materials.

Research Paper

Effect of Counterforts and Buttresses on Retaining Wall

Karthik Thipparthi* , Srikanth Kandalai **, Kastro Kiran V. ***
*-*** Department of Civil Engineering, Vignan Institute of Technology and Science, Bhuvanagiri, Telangana, India.
Thipparthi, K., Kandalai, S., and Kiran, V. K. (2020). Effect of Counterforts and Buttresses on Retaining Wall. i-manager's Journal on Civil Engineering, 10(3), 7-11. https://doi.org/10.26634/jce.10.3.17412

Abstract

The design of rigid retaining wall (Cantilever, Counterfort, Buttress) is based on pressure exerted by the retaining material, wall slope, height, ease of construction and stability. When the retaining wall height is more than 8 m, the selection of extra supports, i.e., either counterforts or buttresses is based upon the designer's experience. By conducting comparative study on resisting forces for varying heights, the behavior of these supports on retaining wall can be depicted. The depiction of forces can be achieved by running an analysis in STAAD.Pro with preliminary dimensions and soil parameters respectively. Resisting forces from counterfort and buttress supports on retaining wall are equal when the height is in between 9 m to 24 m but buttress support has shown less resisting forces when the height is less than 9 m.

Research Paper

An Overview of Jointed Plain Concrete Pavement Aggregate Proportioning Enhancement

Hossein Khazaei* , P. Sravana **
*-** Department of Civil Engineering, Jawaharlal Nehru Technological University, Hyderabad, Telangana, India.
Khazaei, H., and Sravana, P. (2020). An Overview of Jointed Plain Concrete Pavement Aggregate Proportioning Enhancement. i-manager's Journal on Civil Engineering, 10(3), 12-20. https://doi.org/10.26634/jce.10.3.17579

Abstract

Most of the specifications restricted the maximum nominal size of coarse aggregate up to 25 mm for Jointed Plain Concrete Pavement, while this maximum nominal size of coarse aggregate can be increased up to 31 mm by considering certain steps. These recommendations might contain amendments to the selection of the maximum nominal size and combined aggregate gradation constraint to enhance and improve the quality of the concrete pavement criteria. In the present study, two similar concrete mix designs with a maximum nominal size of 25 mm (PQC-20) in accordance with the Indian specifications and proposed samples with a nominal size of 38 mm (PQC- 40) have been prepared. The effect of increasing the maximum nominal size of coarse aggregates and change of combined gradation limit on air voids, packing density, compressive, flexural strength and the initial cost of the mixes were investigated.

Research Paper

Study on the Flexural Behaviour of SCC with Nano-Particles and Steel Fibers

Mohit Kambanna* , Shrithi S. Badami**
*-** Rashtreeya Vidyalaya College of Engineering, Bangalore, Karnataka, India.
Kambanna, M., and Badami, S. S. (2020). Study on the Flexural Behaviour of SCC with Nano-Particles and Steel Fibres. i-manager's Journal on Civil Engineering, 10(3), 21-31. https://doi.org/10.26634/jce.10.3.17432

Abstract

Self-computing concrete (SCC) is a highly workable type of concrete which does not require any further external compaction or vibration. Super plasticizers are used to increase the ease and flow ability of SCC to a remarkable extent. Many experiments have been conducted by researchers to understand the properties and behaviour of SCC. Validation of finite element modelling with experimental data helps engineers in parametrically characterizing and analyzing the large structural components, which in turn saves time, energy and cost. Incorporation of fibres into SCC to increase its flexural strength is an ongoing research which has gained worldwide attention. This study is an effort to evaluate the behaviour of SCC with steel fibres by incorporating nano silica. Nan-su method of mix design is adopted in this study to obtain the control mix of SCC (SCC-CM) through experimental research. This analysis of FE modelling using Abaqus / CAE proposes to study the behaviour of SCC beam with and without incorporation of nano-silica and steel fibre. Analytical response of SCC beam is in good correspondence with the experimental results which is then compared to SSC beam containing nano-silica and steel fibres (SCC-NS). Response obtained from FEM indicates that SCC beam with nano-silica and steel fibre exhibits significant improvement in load deflection comparison at first crack and failure load, resistance against deflection, load carrying capacity and flexural strength in comparison with normal SCC (NSCC) beam.

Research Paper

Assessment of Groundwater-Surface Water Interaction Based on Hydro-Geochemical Characteristics: A Case Study of Jhelum Basin, Kashmir, India

Dar Sarvat Gull * , Ishfaq Amin **, Shoib Bashir Wani***, Ayaz Mohmood****, Tariq Ahmad Mir *****, Mir Rayees Rashid ******
*-**** Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, India.
***** Department of Civil Engineering, Maharshi Dayanand University, Rohtak, Haryana, India.
****** Junior Engineer, Jammu and Kashmir Power Development Corporation, Jammu and Kashmir, India.
Gull, D. S., Amin, I., Wani, S. B., Mohmood, A., Mir, T. A., and Rashid, M. R. (2020). Assessment of Groundwater-Surface Water Interaction Based on Hydro-Geochemical Characteristics: A Case Study of Jhelum Basin, Kashmir, India. i-manager's Journal on Civil Engineering, 10(3), 32-45. https://doi.org/10.26634/jce.10.3.17283

Abstract

The current examination has been done as a fundamental advance to contemplate the general groundwater – surface water interaction along River Jhelum in Valley of Kashmir. Generally, water table occurs at relatively deeper levels in plateau lands and at shallower depths in low-lying areas. The precise sampling has been carried out throughout the River Jhelum and its tributaries in the months of January and February in Srinagar and other districts, with a view to understand the source of major ions (Ca2+, Mg2+, Na+, HCO3-, Cl-, SO42-) in the groundwater of the territory under examination. About nineteen representative wells (bore wells, dug wells, springs) were selected for a baseline study to comprehend the groundwater – surface interaction along River Jhelum and to assess the overall hydro-geochemical characteristics and suitability of groundwater for drinking and agricultural purposes. The predominant chemical character of groundwater and surface water as well as relative abundance of major ions has been evaluated on Piper Tri-linear diagram and three water groups were identified. The concentrations of major ions in the groundwater and surface water of the area under study are well within the maximum permissible limits as per the specifications of the World Health Organization for drinking purposes. The low sodium hazard and slightly high salinity along with safe to moderate category of water in terms of left over sodiumcarbonate (RSC) document the suitability of groundwater for agricultural purposes.