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

Department of Structural and Geotechical Engineering

The flat slab has gained popularity for many years in the construction industry because of its advantages over the conventional slab. Punching shear failure is the major issue in the flat slab system. The most affected portion in the flat slab system is the slab column joint. The test specimen was modelled by using a finite element software known as ABAQUS. This software has good performance quality and ability to solve the complex problems in different fields of engineering. In order to conduct the study, nine slab-column specimens of the flat slab were casted and subjected to test with four, three and two sides rigidly supported. Three flat slabs with control mix and six flat slabs with hooked end steel fibres were used. The tests were conducted to study the capacity of the test specimen to withstand the punching shear. The crack patterns developed on the test specimens was studied. It was observed that the four side supported slab-column connection of the flat slab enhance more punching shear strength capacity than three and two sides supported. Also, it was found that the usage of the steel fibre can improve the stiffness and the load bearing capacity of the test specimens. © BEIESP.

Department of Digital Communications

School of Information Technology and Engineering

Vellore Campus

School of Civil Engineering

International Journal of Innovative Technology and Exploring Engineering

Punching shear behavior of fibre reinforced flat slab under different support conditions

VIT Unitversity

Fulltext

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SUSTAINABLE MATERIALS AND STRUCTURES FOR CIVIL INFRASTRUCTURES (SMSCI2019)

Experimental investigation of strength properties of red mud concrete

The use of concrete in the construction industry is never ending and so are their complementary ill effects. Thus, they should be handled within the stipulated time and in a sustainable manner. The major idea of the present research work is to assess the strength parameters of the concrete specimens made by inducing bacteria along with a suitable cement replacing substance. Therefore, the use of sustainable strategies like inducing bacterial culture into the concrete mix can act as an active support for both nature as well as the economy of construction industries. There are many substitutes which are used for replacing cement. In this paper, control concrete, concrete made by replacing cement with 8% of Micronized Biomass Silica (MBS) and bacteria induced concrete are compared. The bacteria used is Bacillus Sphaericus and is mixed in the concrete specimens at different levels of 10ml, 20ml, 30ml. M60 grade high strength concrete is casted in the form of cubes and cylinders and their compressive strength and split tensile strength at the age of 7and 28 days are compared with that of conventional concrete. From the test results, it was concluded that, specimens with 20ml bacteria and 8% MBS showed optimum results. Hence, this combination of bacteria and MBS would not only increase strength but also help the concrete against moisture and other harmful particles. © 2019 Elsevier Ltd.

World University root node

Materials Today: Proceedings

Experimental Investigation on Bacterial Concrete with Micronized Biomass Silica

This research work aims at studying the influence of fermented organic additive on strength and carbonation of air lime mortar for the conservation of heritage structures. Binder to aggregate ratio of 1:3 by weight and water to binder ratio of 0.7 were considered. Red grape (Vitis vinifera) as an organic additive with 2, 4, 6, 8 and 10 percentages were accounted for fermentation of 0, 1, 2 and 3 days and were added with lime mortar. Experimental investigations were conducted on mechanical and mineralogical properties. 6% of organic addition with 3 days of fermentation resulted in a 49% increase in the mechanical resistance compared to the reference mortar on 90th-day test. XRD records an increased calcite formation due to accelerated carbonation. FTIR indicates the presence of polysaccharides that have helped in accelerating carbonation. TGA-DTA supports XRD and FTIR results in confirming the strength gain through the formation of calcium carbonate. Hence, the results are explicit, revealing that the fermented organic addition in air lime mortar has increased the carbonation rate, as the polysaccharides present in organic played a crucial role in accelerating the transformation of calcium hydroxide to forms of calcium carbonate and thereby enhancing the strength significantly. © 2020, © 2020 Informa UK Limited, trading as Taylor &amp; Francis Group.

European Journal of Environmental and Civil Engineering

Influence of organic additive on carbonation of air lime mortar–changes in mechanical and mineralogical characteristics

Now-a-days fire accidents are occurring more in number. To tackle that a suitable concrete should be made which contains property of fire resistivity. In this research, a material namely Perlite Powder is used, the purpose of PP is to replace with cement for different percentages of PP subjecting to elevated temperatures in concrete. For this purpose, PP with cement replacement of 1, 3, 5, 7% by weight has been made, those specimens kept in a furnace for 1 hr after reaching the target temperature. Experiments conducted in this study include compressive strength, flexural strength, tensile strength at 28 days. Micro-structural analysis such as X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM) were conducted. The researches have focused that the PP with cement replacement of 5% by weight achieved better results at elevated temperatures when compared to normal concrete. © BEIESP.

International Journal of Recent Technology and Engineering

Experimental study on mechanical properties and micro-structure of perlite powder concrete subjected to elevated temperatures

The utilization of combination of different mineral admixtures like fly ash (FA), alcoffine (ALC) and nano silica (NS) which are by-products from industries possess pozzalanic nature and is an environmental friendly material in construction industry. The environmental impact can be minimized by making use of many industrial by products in a sustainable manner. The evaluation of strength and durability study was performed using on concrete with FA, ALC and NS as a partial replacement of Ordinary Portland Cement (OPC). The studied parameters were compressive strength, split tensile strength and flexural strength, as well as the durability study that involves water absorption and sorptivity. The combination of FA 25%, ALC 10% and NS 0, 0.5, 1, 2 and 3% was used in partial substitution of cement at by weight. The results show that among different NS content High performance concrete containing 25%-10%-1% FA-AL-NS exhibited the best results for the strength and durability property tests at 7, 28 days for strength and 28, 90 days for durability properties. © BEIESP.

Experimental study on the strength and durability of high performance nano silica concrete

Nowadays, the quantity of Waste Marble Powder (WMP) as a waste material is significantly increased in India and is not fit for the environment. Therefore, the main objective is to utilize this WMP in Self-Compacting Concrete (SCC) as a filler material. This was done in keeping the view the requirements of fines in the SCC and to find out effective utilization of waste marble powder. Fine aggregate is partially replaced by WMP. Five mixes were prepared, one without WMP and other four with varying amounts of WMP. The fresh concrete properties of SCC were measured by slump flow test, T50 cm, J-Ring test, V-funnel test, and L-Box test and the hardened concrete properties of SCC were tested for compressive strength test, splitting tensile test, flexural strength test and modulus of elasticity. It was found waste WMP can be replaced as filler material in developing the SCC and WMP helps us to reduce the total voids content in concrete. Finally, it showed a good correlation between fresh concrete properties and hardened concrete properties for SCC. © 2019, Institute of Advanced Scientific Research, Inc. All rights reserved.

Journal of Advanced Research in Dynamical and Control Systems

Effect of waste marble powder as filler material on fresh and hardened properties of self-compacting concrete

A new design method, Direct Strength Method (DSM), has been introduced by researchers in recent years for calculating the ultimate design strength of cold-formed steel sections. DSM is basically a stress-based approach, wherein the strength of the section is reduced to take care of buckling effects. The ultimate strengths corresponding to three buckling modes, local, distortional, and global modes are distinguished in DSM, in which the elastic buckling stresses are determined using analytical expressions or by using numerical methods like finite element, finite strip, or spline finite strip method. A finite strip computational procedure for evaluating the critical elastic buckling stresses has been proposed in the present study. Also, decomposition of buckling modes into pure modes can be performed using the formulation. This formulation has been validated for a range of cross-sectional dimensions under uniaxial compression and flexure and can be used as a design utility for IS 801 based on DSM. © 2019, Springer Nature Singapore Pte Ltd.

Lecture Notes in Civil Engineering

Twlight-iitm—a computational utility for elastic buckling stress predictions of cold-formed steel elements

Aesthetics of a structure are given primary importance in the present days and this demands new and challenging designs with large spans and complicated designs. The role of a structural engineer becomes more significant because of these structural irregularities. This makes it necessary to have advanced technologies like post-tensioning if we are not ready to compromise in the aesthetics. Generation of such irregular structures will form varying mass and stiffness distribution which imparts to the effect of torsion. This paper deals with the various structural behaviour of a multi-storied RC Convention Centre building having large spans of around 32 m. The effect on the structure due to these large spans is compared with both RC and prestressed concrete. The roof slab of the auditorium portion of the structure is designed with normal RCC and compared with Slabs resting on Prestressed Post-tensioned Girders using the software Adapt Builder 2016. A comparative study between RCC and prestressed concrete is also done. Diaphragm action of the structure is considered for seismic design in order to provide a monolithic action and hence to counteract the effect of torsion. A comparative study is done with and without considering the effect of torsion into account and the results shows that in higher seismic zones the effect of torsion is predominant and proper care should be given to extreme columns and corner columns which are more vulnerable to failure. Response spectrum analysis of the structure is done in STAAD.Pro and storey response plots are obtained. © Springer Nature Singapore Pte Ltd. 2019.

GCEC 2017 Lecture Notes in Civil Engineering

Comparative Study on Various Behaviours of an RC Structure with Prestressed Concrete Structure

The contribution of the research is to study carbonation process of shell lime mortar on addition of organics. Lime mortar of binder to aggregate ratio 1:3 with addition of Kadukkai (Terminalia Chebula), Jaggery (Unrefined sugar) and combined Kadukkai and Jaggery, in an amount of 1Â kg, 3Â kg and 0.5Â kgÂ +Â 1.5Â kg respectively per 10Â L of water have been used, where the influence of organics towards development of strength and durability is well identified to suggest the use in lime construction. Traditional phenolphthalein test was conducted to measure the carbonation depth and thermo gravimetric analysis with differential thermal analysis (TGA-DTA) was used to verify the degree of carbonation and carbonation profile of lime mortar specimen. On fermentation, the organics reduce to carbon-di-oxide within the mortar, altering the hydrated phases and also resulting in more formation of load bearing forms of calcite (calcium carbonate). XRD results interpret the hydrated phases such as Calcite, Calcium-Silicate-Hydrate (CSH) and Calcium-Aluminate-Hydrate (CAH) of the organic modified mortars under carbonation and it is in confirmation with TGA. © 2019, RILEM.