Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Civil

It's well known that due to increase in population and abundant use of materials, there is a scarcity of materials in the construction industry. In this modern era, people prefer to have a modern construction which made usage of conventional building materials abundantly. Though increase in the usage of these materials leads to the scarcity, it also opens way for an unsustainable environment. In order to overcome this both scarcity and environmental issue and to develop an eco-friendly environment, many researchers were going on to replace these building materials by any other natural material. Bamboo is one of the exact alternative materials to be replaced in the construction industry because of its mechanical and chemical properties. Bamboo has a major application in the construction industry and used in roofs, flooring, foundations, trusses etc. Bamboo is preferred as the best sustainable material and suggested for low cost housing projects. In this paper all the physical and mechanical properties of bamboo reinforced structural elements, influence of bamboo materials in cement and geopolymer concrete is reviewed. © Published under licence by IOP Publishing Ltd.

World University root node

School of Civil Engineering

Chennai Campus

Fulltext

IOP Conference Series: Earth and Environmental Science

Bamboo materials in cement, geopolymer and reinforced concrete as sustainable solutions for better tomorrow

The primary advantage of geo polymeric concrete is the decrease in ecological effect in agreement with the concept of sustainable development. The present investigation thinks about the quality, and transport properties of GGBS-and fly debris based geopolymer mortars with different level of steatite powder. The main variables investigated were the hybrid binder of geopolymer mortar. In this present study fly ash and GGBS is partial replacement with different amounts of steatite powder (soap stone) 0%,10%, 20%, 30%, 40% &amp; 50% to obtained the mechanical properties such as compressive strength and split tensile strength. For comparison, one mixture of ordinary portland cement mortar (OPC) is also studied. The alkali activators are prepared by combining NaOH and Na2SiO3 solution in the ratio of 2.5 and NaOH concentration 10M. The flyash based Geopolymer mortar specimens are heat curing (oven dry) at 70C for 48 hours and ambient curing was done in GGBS based Geopolymer mortar. Test results were obtained that, when increasing percentages of fly ash partial replaced with the steatite powder is gradually increased the strength and the proportion of steatite powder 30% are the optimum range value. © Published under licence by IOP Publishing Ltd.

IOP Conference Series: Materials Science and Engineering

Study on mechanical properties of alkali activated binary blended binder containing steatite powder and fly ash / GGBS

This study aims to study topology Optimized Hammerhead Pier Beam (TOHPB) designed with a density-based technique. TOHPB is made with Preplaced Aggregate Fibrous Concrete (PAFC), which comprises two main preparation processes. First, the fibers and coarse aggregates filled into empty formwork to develop a skeletal system. Second, voids in the skeletal system are filled with cement grout; hence a type of PAFC was obtained. Besides, alleviating the self-weight of the concrete beam is a top priority of design engineering without compromising its strength and durability. The effect of topology optimization in association with the safety of factors and elastic design case is considered in this study. Explicitly, (i) compliance is scaled down to a minimum under a perimeter on the utilized material (ii) the principle Drucker-Prager is employed to impose the stress limitations even though utilization of material is minimized. The problem is designed with imposed stress limitation and generates keys that involve an essential part of post-processing before fabrication. In total, ten TOHPB were prepared with and without the combined shape of crimped-hooked end steel fiber. Two different types of fiber reinforcement schemes were used; first, the fibers were reinforced to full beam cross-section; then, the fibers were reinforced to the top half of the beam cross-section. Results revealed that the TOHPB beam reinforced full cross-section exhibited better ultimate load performance than that of the beam with half reinforced cross-section. © 2020, Budapest University of Technology and Economics. All rights reserved.

Department of Mathematics

School of Advanced Sciences

Vellore Campus

Periodica Polytechnica Civil Engineering

Study of topology optimized hammerhead pier beam made with novel preplaced aggregate fibrous concrete

In the present scenario where there are no standard procedure/codal provisions for the mix design of ferrosialate geopolymers, this study proposes a new and efficient way to predict the compressive strength of these mortar specimens by generating prediction equations. This work also studies the influence of various parameters on the strength gain of ferrosialate geopolymers and compares that with conventional fly ash/sialate based geopolymers. Red mud (RM) and fly ash are used as a precursor for geopolymerization, and Gene Expression Programming (GEP) is used for predictive analytics. Ferrosialate mortar samples displayed 112.4% higher compressive strength than sialate mortar samples with denser microstructure and least unreacted phases in the binder. Ideal RM replacement in the binder is determined as 30% and 35% for the oven and ambient curing conditions, respectively. If RM is used as raw feed for ferrosialate geopolymers, the optimum molarity of NaOH solution is found to be 8 M. Oven curing type has higher possibility of strength gain than ambient curing type, and increased curing time leads to a higher possibility of strength gain in ferrosialate geopolymers. The average r2 values for GEP I and GEP II models are 0.88 and 0.92, respectively. Errors of training and validation sets also suggest that a good fit is obtained between observed and predicted values. This indicates that both the models performed well in predicting the compressive strength. Though this model is generated for ferrosialate geopolymer, a similar procedure can be adapted to any geopolymer for the strength prediction. © 2019 Elsevier Ltd

VIT Unitversity

Construction and Building Materials

Experimental investigations and GEP modelling of compressive strength of ferrosialate based geopolymer mortars

The Multi-layer Two Stage Fibrous Composite (MTSFC) is an innovative type of composite that has gained popularity in recent years and pulled the attention of researchers on global level. The process of preparation composes the subsequent two key actions; first, the natural coarse aggregate skeleton is formed by piling the coarse aggregates and fibres in a particular way; second, the artificially formed skeleton is fully filled with cement grout by gravity method. In the present study, the effect of Glass Fibre Mesh (GFM) insertion on MTSFC is researched by subjecting to falling mass and projectile impacts. Totally, twenty one mixtures with insertion of GFM of varied diameters and with different layout in between the layers are designed and tested under falling mass and projectile impacts. Additionally, the hooked end fibre at a dosage of 2.5% volume of composite was constantly used for all designed mixtures. The purpose of inserting glass fibre mesh in between the top-middle and middle-bottom layer is to play a role of trapping layer in order to prevent/delay the crack propagation. The multiple number of hits to provoke crack initiation and crack ultimate, impact energy at crack initiation and crack ultimate, impact ductility index, front damage area, bottom damage area, damage ratio, depth of penetration and damage pattern are studied hereby. The findings revealed that the GFM reinforcement stratagem combined with steel fibres in MTSFC, turned out to deliver high resistance against impact load and extends the failure duration by absorbing more energy. Also, findings indicated that the depth of penetration, damage area and damage ratio were raised with the number of hits and were lessened by the high content steel fibres together with GFM and coarse aggregate. Consequently, the effect of GFM insertion is minimal when it is placed inbetween top-middle layer. Preferably, it is best to insert GFM inbetween mid-bottom layer in the MTSFC, which extends to delay the crack proliferation while tensile stress are being transformed and offers more impact energy absorbance. The research outcomes obtained from this study is to deliver a baseline information for continuing a deeper research work on MTSFC under impact. © 2020 Elsevier Ltd

Multi-layered two stage fibrous composites against low-velocity falling mass and projectile impact

This paper presents the design and development of stretchable and deformable broadband antenna using low-cost silicone rubber-based dielectric substrate. A slot is introduced in the substrate to improve the stretchable behaviour. The dielectric properties of the substrate are measured using suspended ring resonator method. The proposed antenna uses silver elastomeric Lycra fabric as the conductive medium. The resistivity of the conducting Ag fabric is 1 Ω per sq. mm. The conducting patch and ground plane are attached with the substrate using silicone-based adhesive. The fabricated antenna is tested for its resonant characteristics using the vector network analyser. © 2020, Indian Academy of Sciences.

School of Electronics Engineering

Pramana - Journal of Physics

Dynamic frequency analysis of stress–strain-dependent reversibly deformable broadband RF antenna over unevenly made elastomeric substrate

The recent technology of geopolymer concrete is a substitute material for ordinary portland cement concrete which is produced from the polycondensation reaction of aluminosilicate materials with alkaline activator solutions. The cost of river sand is high since the demand for the same is also high. Manufactured sand is used as a replacement material for river sand in geopolymer concrete. This paper mainly focuses to find the properties of fly ash (FA) – based geopolymer concrete under ambient cured temperature like compressive strength, stress strain behaviour, modulus of elasticity, Poission’s ratio and impact resistance. The result of geopolymer concrete is compared with ordinary portland cement concrete. The elasticity modulus and Poission’s ratio of geopolymer concrete are lower than conventional concrete. The Stress-strain behaviour of geopolymer concrete is similar to conventional concrete. The impact resistance of geopolymer concrete is very good when compared with conventional concrete. © 2020 De Gruyter. All rights reserved.

Journal of Polymer Engineering

Experimental investigations on compressive, impact and prediction of stress-strain of fly ash-geopolymer and portland cement concrete

Nowadays many techniques have been developed to make buildings taller and more efficient. Moreover, if unsymmetrical tall buildings are considered, the stability of structure plays a vital role and these are majorly effected by the lateral loads like wind and earthquake. In order to resist from lateral loads, different structural systems have been followed practically like bracing system, outrigger system, dia grid, hexa grid systems. This paper deals with the use of outrigger system for unsymmetrical tall building of 30 storey and its Comparision with the same building without outrigger system. This paper also emphases on determining the exact position of outrigger in tall buildings. Also, in the second case, keeping the height of the building same as that of the conventional building the floor areas are increased by reducing the number of interior columns with and without outrigger system and the stability is checked. The results reveal the ideal position of outrigger at top position and other at 0.5 times the height of the building. and with the use of outrigger system the displacement is reduced to 26.69% which improves the stiffness and efficiency of unsymmetrical building. © IJSTR 2020.

International Journal of Scientific and Technology Research

Ideal location of outrigger system and its efficiency for unsymmetrical tall buildings under lateral loadings

This paper presents the seismic data analysis and visualization using R programming for the state of Maharashtra, India. Maharashtra has witnessed a significant number of earthquakes ranging from low to high in magnitude. The past earthquake data of a particular location are useful to the civil and structural engineers for the safe and efficient planning, designing and construction of seismic resistant buildings in that locality. In this paper the past earthquake data of Maharashtra from the year 1912 to 2009 are collected and analyzed. There are 53 earthquake data with magnitudes ranging from 3.6 to 7.2. This analysis shows the relationship between magnitude and depth, intensity and PGA, visualization of classification of earthquakes depends on magnitude and intensity. © 2020 Institute of Physics Publishing. All rights reserved.

Computer Science

School of Computer Science and Engineering

Earthquake data analysis and data visualization of Maharashtra state, India from 1912 to 2009 using R programming

Steel fenders are frequently employed in bridge pier shields to engross collision energy due to vessel impact. However, vulnerability to corrosion is a major drawback in existing steel fenders. To end this, an innovative composite fender structure consisting of corrugated steel and Preplaced Aggregate Fibre Reinforced Concrete (PAFRC) is introduced. Corrugated plates of steel are intended to absorb energy and stiff guard outer panels made with PAFRC exhibit enhanced resistance to impact and ductility. Six steel-PAFRC fenders were prepared with the steel plates of two different thicknesses, where the four top panels of the PAFRC are reinforced with short and long hooked end steel fibres while bottom panels are made with non-fibrous preplaced aggregate concrete (PAC). All steel-PAFRC fenders were tested through a drop weight impact testing device to investigate their impact behaviour and failure mechanism. Collision energy at crack initiation and the ultimate crack of PAFRC panels, crushing deformation of corrugated plates and failure configuration were also examined. Additionally, a numerical model of composite fenders was developed and verified through experimental evidence. Research revealed the crashworthiness of PAFRC panel was higher when compared to the PAC panel. The relative resistance of corrugated plates of steel and the PAFRC panels had a dramatic effect on the composite fender's impact response. © 2020 Institution of Structural Engineers