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


Volume 3 Issue 4 September - November 2013

Research Paper

Distortional Analysis of Laminated Composite Box Girders

Shitalkumar Chaudhari* , Akhil Upadhyay**
* P.G Student, Indian Institute of Technology, Roorkee.
** Associate Professor, Indian Institute of Technology, Roorkee.
Chaudhari,S.C., and Upadhyay,A. (2013). Distortional Analysis Of Laminated Composite Box Girders . i-manager’s Journal on Civil Engineering, 3(4), 1-15. https://doi.org/10.26634/jce.3.4.2521

Abstract

Analysis of longitudinal bending and pure torsion can be made by means of elementary theories while distortional effects in the box girders cannot be predicted by these theories. The distortional action of the box girder consists of (a) transverse deformation and (b) longitudinal deformation (warping). Laminated composites, which are of orthotropic nature were initially limited to aerospace applications, but now gradually they are being applied in structural applications. The orthotropic nature of FRP has to be taken into consideration in all these analysis. The effect of orthotropy due to fiber orientations is studied by changing the orthotropy ratio of different elements of the FRP single- cell box beam subjected to the distortional loading. Similarly, the effect of cross-sectional parameters on the distortional stresses is also studied. All these analysis is carried out by using the FEM package ANSYS 7.1. Then BEF charts are developed for 0, ± 45, 90 fiber orientations of the box beam and these charts are validated for different cross-sections as well as different geometrical properties.

Research Paper

Experimental Study On Crumb Rubber Hollow Concrete Block

Senthil Vadivel* , M. Doddurani**, R. Thenmozhi***
* Professor & Head, Department of Civil Engineering, Dr.N.G.P. Institute of Technology, Coimbatore, Tamilnadu, India.
** Assistant Engineer, PWD/WRO, Upper Cauvery Basin Circle, Salem, Tamilnadu, India.
*** Associate Professor, Department of Civil Engineering, Government College of Technology, Coimbatore, Tamilnadu, India
Vadivel,S.T., Doddurani.M., and Thenmozhi.R. (2013). Durability Studies On Steel Fiber- Reinforced Self-Compacting Concrete. i-manager’s Journal on Civil Engineering, 3(4), 16-21. https://doi.org/10.26634/jce.3.4.2522

Abstract

Accumulation of discarded scrap tyres are non- biodegradable and have been a major concern. Even after a long – period of land fill treatment unmanaged waste tyre poses environmental and health risk through fire hazard and as a breeding ground for disease carrying mosquitoes. Therefore utilization of crumb rubber from this scrap tyres for the production of building materials in the construction industry would help to preserve the natural resources and also maintain the ecological balance. The study reported in this paper is a development of Crumb Rubber Hollow Concrete Block (CRHCB). The main objective of this paper is to investigate the mechanical properties of hollow blocks at hardened state obtained by a partial substitution of fine and coarse aggregates with different volume percentages of waste tyres rubber particles having the same dimensions of replaced aggregates. Density, water absorption and compressive strength were evaluated and comparison of results of CRHCB with the Conventional Hollow Blocks (CHB) was made. Moreover a preliminary geometrical, physical and mechanical characterization on scrap tyre rubber shreds were made. The CRHCB showed lower unit weight compared to conventional specimens. The results of compressive strength of CRHCB are slightly lesser when replacing coarse aggregate rather than fine aggregate. Also theoretical model on normalized compressive strength versus percentage replacement of rubber shreds is also presented. It has been found that CRHCB can be produced as load – bearing hollow blocks as well as light weight hollow blocks.

Research Paper

Study On The Effect Of Quartz Sand And Hybrid Fibers On The Properties Of Fresh And Hardened High Strength Self Compacting Fiber Reinforced Concrete

B. Narendra Kumar* , Srinivasa Rao Putti**
* Associate Professor, Department of Civil Engineering, VNR VJIET, Hyderabad, India.
** Professor, Department of Civil Engineering, JNTU College of Engineering, Hyderabad, India.
*** P.G Student, Department of Civil Engineering, VNR VJIET, Hyderabad, India.
Kumar,N.B., Rao,S.P., and Rajesh.K. (2013). Study on The Effect of Quartz Sand and Hybrid Fibers on The Properties of Fresh and Hardened High Strength Self Compacting Fiber Reinforced Concrete. i-manager’s Journal on Civil Engineering, 3(4), 22-27. https://doi.org/10.26634/jce.3.4.2523

Abstract

In today's world, there is a huge demand for infrastructure in less space and with high altitudes. For such heavy structures, the space between the reinforcing bars is very less. To overcome these problems High Strength Self Compacting Fiber Reinforced Concrete (HSSCFRC) is developed. To pump concrete for higher altitudes and compact itself, SCC properties are used. To build heavy structures in less space high strength is required. So that M grade of concrete are 100 being developed in India. The finer filler particles like micro silica and quartz powder increase the strength. Quartz in crystalline form is an inert material, but in amorphous form the silica reacts with the calcium hydroxide (which is the waste product) to form gel. The gel formed holds the aggregate and therefore a good bond is formed. This paper presents the results of an experimental investigation carried out to evaluate the mechanical properties of concrete mixtures in which fine aggregate was replaced with Quartz Sand. Quartz Sand was replaced in six percentages i.e. 0%, 20%, 40%, 60%, 80% and 100% of fine aggregate by weight. Tests were performed for properties of fresh and hardened concrete. Compressive strength, splitting tensile strength and flexural strength were determined at 7, 28 and 90 days. Test results indicate significant improvement in the strength properties of high strength self compacting concrete by the inclusion of Quartz Sand as complete replacement of fine aggregate and can be effectively used in structural concrete.

Research Paper

A Web-Based Approach For Construction Management Information System

A.R. Ravish Kumar* , F. Rajak**
* Assistant Professor, Department of Architecture, NIT Patna.
** Professor & Head, Department of Architecture, NIT Patna.
Kumar,R.A.R., and Rajak.F. (2013). A Web-Based Approach For Construction Management Information System. i-manager’s Journal on Civil Engineering, 3(4), 28-40. https://doi.org/10.26634/jce.3.4.2524

Abstract

Technical advancements in construction over the years have allowed us to build faster, safer and bigger. But the goal remains the same- completion of a quality product on time and within budget. To achieve this goal, the management needs to know the progress of the project in a timely and accurate manner. That is how the project progresses, where they are currently in comparison to the initially set plans, whether the deadlines are met, budgets are respected etc. Managing a major project is almost impossible without a comprehensive management plan and a functional Construction Management Information System (CMIS), which is dynamic in nature. The present paper aims to develop a system for the project personnel in construction projects to collaborate on Web to improve the management of the exchanged information. CMIS is a tool to help the project manager as the decision maker in the project site. This system will provide the information needed by project manager to execute his job. CMIS is based on database. The scope of this dissertation is to analyze and systemize the information needs of project personnel in Building Construction Department and apply CMIS to enhance the problem solving and information management abilities of construction site management personnel. The project planning and scheduling has been analysed using the commercial software package Primavera Project Planner. A web based approach has been chosen for CMIS implementation. This approach allows the user to access CMIS from anywhere with user name and password through the internet. It provides several user interfaces which are not new for the construction personnel. CMIS just transfers these user interfaces into an online system. Finally CMIS is applied to a live project, as a case study.

Research Paper

Workability And Strength Characteristics Of Self Compacting Concrete Subjected To Sustained Elevated Temperatures

Shanthappa B.C* , Prahallada M.C.**, Prakash K.B.***
* Professor, Department of Civil Engineering, S. J. M. Institute of Technology, Chitradurga ,Karnataka, India.
** Professor, Department of Civil Engineering, Christ University Faculty of Engineering, Bangalore,Karnataka, India.
*** Principal, Government College of Engineering, Haveri, Karnataka, India.
Shanthappa.B.C., Prahallada.M.C., and Prakash.K.B. (2013). Workability and Strength Characteristics of Self Compacting Concrete Subjected to Sustained Elevated Temperatures. i-manager’s Journal on Civil Engineering, 3(4), 41-49. https://doi.org/10.26634/jce.3.4.2525

Abstract

This paper presents an assessment of effect of sustained temperatures on strength properties of self compacting concrete produced by the combination of admixtures (Superplasticizer + Viscosity modifying admixture + Air entraining agent + Water proofing compound). The concrete testing specimens were prepared by a mix proportion 1:2.7:6.1:5.1 with cement: fly ash: sand: coarse aggregate with a water/binder ratio of 0.38 and water cured for 28days. After 28days of curing the specimens were kept in oven at required temperature (100oC, 200oC, 800oC and 900oC) for 4 hrs at constant temperatures. The specimens after cooling were weighed again to find the percentage loss of weight and were thoroughly observed for their change in colour and cracks. These specimens were tested for their respective strengths like compressive strength, flexural strength, tensile strength and impact strength for different percentage addition of last admixture. SCC produced with the combination of admixtures show better resistance to elevated temperatures. The results obtained were compared with the corresponding properties of normal concrete with the same water, cement and air content.