Effect of Molarity on Development of Fly Ash Based Geopolymer High Performance Concrete

Global Virtual Conference in Civil Engineering (GVCCE) 2023

7 Pages Posted: 31 December 2023

Ram Chatorikar
Government College of Engineering, Chhatrapati Sambhajinagar,
Maharashtra, India.
chatorikar.ram@gmail.com

Sanjay Jamkar

Government College of Engineering, Chhatrapati Sambhajinagar,
Maharashtra, India.
ssjamkar@yahoo.co

Date Written: December 14, 2023 

Abstract

This paper evaluates the effect for molarity of alkaline solution on development of Geopolymer High Performance Concrete (GHPC). The important parameters like alkaline/binder ratio (AL/B), molarity of alkaline solution, curing temperature and fineness of binder plays an important role in the development of GHPC. Alkaline binder solutions like Sodium Hydroxide and Sodium Silicate were used in present investigation. Molarity of alkaline solution of Sodium Hydroxide was varied from M10, M12, M14 and M16. Alkaline binder ratio was considered as 0.35 and processed fly ash (FA) as a binder was used for development of GHPC in the present investigation and tested for compressive strength after 3 hours, 8 hours and 24 hours oven heat curing period. Oven heat curing temperature was maintained at 90˚C. It was observed that as the molarity of alkaline solution increases, compressive strength of cured geopolymer samples also increases moderately but workability of fresh geopolymer concrete mixes reduced from molarity M14 to M16.

Keywords: Geopolymer High Performance Concrete, molarity, fly ash, oven heat curing, compressive strength

Suggested Citation:

Ram Chatorikar, R. C., & Jamkar, S. (2023). EFFECT OF MOLARITY ON DEVELOPMENT OF FLY ASH BASED GEOPOLYMER HIGH PERFORMANCE CONCRETE. In Global Journal in Civil Engineering (Vol. 1, Number 5, p. 1). Zenodo. https://doi.org/10.5281/zenodo.10446643

To Download the full paper:

Available at Zenodo. https://doi.org/10.5281/zenodo.10446643

Preview of Structural Design Parameters for Flyover Under Increasing Spatial Contraints

Global Virtual Conference in Civil Engineering (GVCCE) 2023

16 Pages Posted: 31 December 2023

Ramchandani Jaya Rajkumar

MGM University,Jawaharlal Nehru Engineering College, Chhatrapati Sambhaji Nagar, Maharashtra –431003

jramchandani@mgmu.ac.in

Suddhasheel Ghosh

MGM University,Jawaharlal Nehru Engineering College, Chhatrapati Sambhaji Nagar, Maharashtra –431003
sghosh@mgmu.ac.in

Date Written: December 14, 2023

Abstract
Structural optimization considering twoobjectives simultaneously would generate a set of optimal solutions, which is called a Pareto set, instead of a unique optimal solution and thus may not satisfy the requirements of designers. This paper focuses on proposing a comprehensive criterion to weight each objective and thus convert multi-objective optimization problems to single-objective optimization problems.In recent decades, the failure of bridges during service, as well as new construction has increased with an average of 129 bridges per year during the decade 2007–2017. The average age of the bridges is 34.53 years at failure during service against the prescribed design life of 100 years. The average age of failure of bridges in India is relatively high compared to failures in China (23.60 years) and much lower compared to failures in the USA (at least 51.70 years). Thus considering the local technical issues of Chhatrapati Sambhaji Nagar are considered and based on that a general framework is tried to prepare. In this paper, the factors affecting the design of the flyover are identified. Further they are classified as dependent and independent parameters and the bounds of independent parameters are identified based on the manual design of the flyover.

Keywords: Structural optimization,optimal solutions, Multi-objective optimization, Pareto set.

Suggested Citation:

Ramchandani, J. R., & Ghosh, S. (2023). PREVIEW OF STRUCTURAL DESIGN PARAMETERS FOR FLYOVERS UNDER INCREASING SPATIAL CONSTRAINTS. In Global Journal in Civil Engineering (Vol. 1, Number 5). Zenodo. https://doi.org/10.5281/zenodo.10447102

To Download the full paper:

Available at Zenodo. https://doi.org/10.5281/zenodo.10447102

Partial Replacement of Cement with Marble Dust Powder, Fine Aggregate with Copper Slag, and Coarse Aggregate with Recycled Aggregate in Concrete

Global Virtual Conference in Civil Engineering (GVCCE) 2023

12 Pages Posted: 31 December 2023

Sanjay Yadav
Chandigarh University, Punjab, India
yadavsanjay160598@gmail.com

Shalika Mehta

Chandigarh University, Punjab, India
Shalika.e1976@cumail.com

Date Written: December 14, 2023 

Abstract
Construction companies generate non-biodegradable waste that harms the environment. However, incorporating this waste into concrete can support sustainable and eco-friendly construction practices. The present investigations study the partial replacement of binder materials such as cement with marble dust powder (MDP), fine aggregate with copper slag (CPS), and coarse aggregate with recycled aggregate concrete (RAC), when substituted for coarse aggregate, to analyze concrete mechanical properties. A constant percentage of marble dust powder was added to replace the binder material (cement). Additionally, copper slag replaced 10%, 20%, and 30% of the fine aggregate, and recycled aggregate replaced 10%, 20%, and 30% of the coarse aggregate. According to the M-30 standard, Specimens' compressive, tensile, and flexural strengths were evaluated for (7, 14, & 28) days after cure, respectively. These additives can improve concrete's mechanical characteristics. Thus, these materials have the potential to serve as alternatives to conventional construction materials through partial replacement

Keywords: Concrete, Marble Dust Powder, Copper Slag, Recycled Aggregate, and strength.

Suggested Citation:

Yadav, S., & Mehta, S. (2023). PARTIAL REPLACEMENT OF CEMENT WITH MARBLE DUST POWDER, FINE AGGREGATE WITH COPPER SLAG, AND COARSE AGGREGATE WITH RECYCLED AGGREGATE IN CONCRETE. In Global Journal in Civil Engineering (Vol. 1, Number 5). Zenodo. https://doi.org/10.5281/zenodo.10447155

To Download the full paper:

Available at Zenodo. https://doi.org/10.5281/zenodo.10447155

Comparative Evaluation of Statistical Methods for Mapping Debris Flow Suscetiobility in Himalayas, India
 

Global Virtual Conference in Civil Engineering (GVCCE) 2023

13 Pages Posted: 31 December 2023

Ankit Kumar
Department of Civil Engineering, Delhi Technological University, Delhi - 110042, India
ankitduhoon003@gmail.com
Raju Sarkar
Department of Civil Engineering, Delhi Technological University, Delhi - 110042, India
rajusarkar@dce.ac.in

Date Written: December 14, 2023 

Abstract
Comparing maps from different statistical models or approaches is important for geo-environmental uses. This paper uses various models to compare debris flow susceptibility maps of the same area. The frequency of debris flow in hilly regions requires future developmental planning and study. A crucial step in studying debris flow is weighing the factors causing it. This paper compares different weighting procedures for debris flow susceptibility mapping through map evaluation. The evaluation has been done through frequency ratio and Shannon entropy statistical models. According to the difference image analysis, there is a complete matching (i.e., no difference) of roughly 86.61% of the total pixels between the two debris flow susceptibility maps. It is possible to interchange frequency ratio and
Shannon entropy models based on their similar image analysis values.

Keywords: Debris flow susceptibility zonation; Comparative evaluation; Difference image analysis

Suggested Citation:

Kumar, A., & Sarkar, R. (2023). COMPARATIVE EVALUATION OF STATISTICAL METHODS FOR MAPPING DEBRIS FLOW SUSCEPTIBILITY IN HIMALAYAS, INDIA. In Global Journal in Civil Engineering (Vol. 1, Number 5). Zenodo. https://doi.org/10.5281/zenodo.10447230

To Download the full paper:

Available at Zenodo. https://doi.org/10.5281/zenodo.10447230

Static and Seismic Effect of Constructing a New Tunnel Vertically Above an Existing Tunnel: A Comparative Study
 

Global Virtual Conference in Civil Engineering (GVCCE) 2023

9 Pages Posted: 31 December 2023

Sumee Tabassum Amin

Department of Civil Engineering, JMI, New Delhi

tabassumamin56@gmail.com
S.M. Abbas

Department of Civil Engineering, JMI, New Delhi
Altaf Usmani

3 DGM, ETDD, EIL, New Delhi

Date Written: December 14, 2023 

Abstract
The necessity for underground tunnels is of paramount importance in today's advancing world ofdevelopment and transportation. Construction of twin tunnels have gained momentum due to their optimal utilization of underground space and enhanced structural stability. Particularly in earthquake prone regions, the seismic vulnerability of such subterranean structures is a significant issue. This research studies the impact of constructing a new tunnel vertically above an existing one, by increasing the vertical spacing under both static and seismic conditions. A 2D plane strain model is designed using Mohr-Coulomb criteria in Midas GTS NX software. The seismic simulation is performed using the Loma Preita earthquake in the horizontal direction. For this study, SeismoMatch generates response spectracompatible time history data for Delhi soil. The responses generated within the existing tunnel are compared before and after the construction of the new tunnel, in the form of lining forces and ground settlement contours for static and seismic cases. The findings indicate that due to construction of a new tunnel, lining forces decrease in the existing tunnel. In static analysis, forces such as axial force, bending moment and shear force however increase with greater spacing. Similar trend is observed in seismic analysis, where these forces are greater in single tunnel than in twin tunnel. This can be attributed to the vertical position and spacing of the new tunnel which aids in load sharing mechanism between the two tunnels. This phenomenon plays a pivotal role in the static and dynamic stability of the twin tunnel system.

Keywords: Debris flow susceptibility zonation; Comparative evaluation; Difference image analysis

Suggested Citation:

Amin, S. T., & Abbas, S. M. (2023). STATIC AND SEISMIC EFFECT OF CONSTRUCTING A NEW TUNNEL VERTICALLY ABOVE AN EXISTING TUNNEL: A COMPARATIVE STUDY. In Global Journal in Civil Engineering (Vol. 1, Number 5). Zenodo. https://doi.org/10.5281/zenodo.10447189

To Download the full paper:

Available at Zenodo. https://doi.org/10.5281/zenodo.10447189