Dr. Venu Malagavelli | Institute Of Aeronautical Engineering (original) (raw)
IOP Conference Series: Materials Science and Engineering
Concrete is the most durable, versatile and reliable building material in the world. Next to wate... more Concrete is the most durable, versatile and reliable building material in the world. Next to water, concrete is the most used material. Ordinary Portland cement production accounts for 5-7% of total greenhous e gas emissions. It also consumes a lot of energy. Today, Geo-polymer concrete (GPC) has become a more sustainable concrete compared to conventional concrete. This research work focuses on the performance of Fly Ash and GGBS based geo-polymer concrete cured in outdoor conditions using a single alkaline activator solution (Geo activator). The variations of Fly Ash and GGBS were (FA100-GGBS0; FA90- GGBS10; FA70-GGBS30; FA50-GGBS50). In this study, only the Geo activator is used to activate Fly Ash and GGBS in the mixtures. Geo polymer concrete of size 100 mm x 100 mm x 100 mm was used in this research work to measure compressive strength at different ages of 7 days and 28 days. The results reveal that the increase in the proportion of GGBS content in the mix increases compression...
An open problem in the research of building materials is the selection of an appropriate algorith... more An open problem in the research of building materials is the selection of an appropriate algorithm to model compressive strength of High Performance Concrete (HPC) effectively. It is because there is no data mining algorithm that outperforms others for all performance measures. Every measure is equally important as each of them highlights different features of the data and of model behavior. The field Multi-Criterion Decision Making (MCDM) involves structuring and solving the decision problems involving multiple criteria where there does not exist a unique optimal solution, and it is necessary to use the preferences of a decision maker to differentiate between solutions. This paper makes an effort to address the problem of algorithm selection by posing it as a MCDM problem, and suggest a solution using Analytical Hierarchy Process. Experimental results show that the proposed technique facilitates the user to select an appropriate algorithm to model compressive strength of HPC.
IOP conference series, Nov 8, 2018
This work aims to improve the flexural behaviour of Geopolymer Concrete (GPC). GPC is an ecofrien... more This work aims to improve the flexural behaviour of Geopolymer Concrete (GPC). GPC is an ecofriendly concrete in which Ordinary Portland Cement (OPC) is completely replaced by pozzolanic materials i.e. Fly Ash or GGBS or Rice Husk Ash and activated alkaline solutions like NaOH or KaOH and Na2SiO3 to act as a binder in the concrete mix. GPC having its own advantages over the OPC concrete, like faster setting time, early age strength and also GPC is a good alternative material for OPC to control the emission of green house gases. But GPC required heat curing. This problem was overcome with partial replacement of fly ash by lime or GGBS or cement. In this study, 2 to 6% of fly ash was replaced by cement or GGBS in GPC. Among the above combination, partial replacement of Fly Ash by cement in GPC shows better performance in mechanical properties of GPC. A comparative study of flexural behaviour of beam with RCC, Geopolymer Concrete beam with 6% replacement of GGBS in fly ash (GGPC) and Geopolymer Concrete beam with 6% replacement of cement in fly ash (CGPC) has been done. The test results revealed that CGPC beams shows better results in compressive strength as well as in flexure and setting time is also reducing considerably when compare with GGPC. CGPC beam shows that less amount of deflection and greater moment of resistance than that of GGPC beam.
International journal of innovative technology and exploring engineering, Oct 30, 2019
Concrete is a building material which is being utilized excessively in the world adjacent to wate... more Concrete is a building material which is being utilized excessively in the world adjacent to water. The nature is influenced due to the extraction of raw matter and also because of the evolution of gases like CO 2. In the ongoing years, there is a speedy growth in the production of waste materials like glass wastes, plastic, Ground Granulated Blast furnace Slag, silica fume, coal ash, wood ash, rice husk ash, etc. Controlling and discarding issues emerge due to these wastes and inflict havoc on the nature. So as to curtail these issues, the waste materials are used as additives or partial substitutions for cement and aggregates in construction field. This paper focuses on strength properties and durability of concrete containing glass fibers by partial substitution of cement and fine aggregate with GGBS and Coal ash respectively. For this work, mix design using IS method is prepared for M30 grade and the tests are conducted for various dosages of glass fibers as 0.5, 1%, 1.5% and 2% by weight of cement. The substitution degree of GGBS is 30% and that of coal ash is 20%. The obtained outcomes are contrasted with conventional concrete.
International Journal of Materials Engineering, Feb 1, 2012
Concrete, a composite material made with cement, aggregates, admixtures or super plasticizers and... more Concrete, a composite material made with cement, aggregates, admixtures or super plasticizers and water comprises in quantity the largest of all man-made materials. Although aggregates make up three fourths of the volume of concrete, the active constituent of concrete is cement paste. The properties and performance of concrete are largely determined by the properties of the cement paste. Super plasticizers in concrete confer some beneficial effects such as acceleration, retardation, air entrainment, water reduction, plasticity etc., and these effects are due to their action on cement. The scientists are mainly concentrating to develop the specialized concretes, to enhance the service life of the buildings, and to provide satisfactory performance under aggressive environments. In the present experimental investigation M 30 concrete is used as control mixture with four different super plasticizers namely SNP (Sulphonated Naphthalene Polymer) 1, SNP 2, SNP 3 and SNP 4. Strength of modified concrete is compared with the normal concrete i.e. without super plasticizer. The results show that the significant improvement in the strength and workability of modified concrete.
IOP conference series, Sep 1, 2022
Masonry components are frequently limited to increase structural capacity. Concrete confinement m... more Masonry components are frequently limited to increase structural capacity. Concrete confinement models are commonly used to develop generalised approaches for assessing the behaviour of confined masonry columns. Concrete and masonry, on the other hand, differ significantly in terms of physical and mechanical qualities. Recent scientific studies on the experimental behaviour of constrained masonry columns have supplied useful knowledge. When two confined and unconfined masonry columns were exposed to vertical loads, an experimental study was conducted to compare their seismic behaviour. The first wall turned into built with conventional clay brick units, at the same time as the second one wall turned into built with modern concrete units. Both types of bricks have been synthetic at factories. The simple masonry homes have been decided via way of means of trying out 4 prisms of every brick kind beneathneath axial compression plus 4 small partitions subjected to diagonal compression, in addition to the unit homes, the one-of-a-kind mortars used for laying the bricks, and the obvious masonry homes received via way of means of trying out 4 prisms of every brick kind beneathneath axial compression plus 4 small partitions subjected to diagonal compression. The purpose of this study is to conduct an experimental analysis of brick masonry columns in order to assess the strength of specimens after 28 days. Clay substance that is both contained and unconfined.
International journal of innovative technology and exploring engineering, Sep 30, 2019
Addition of glass fibers into concrete significantly modifies its tensile strength. The fibers ar... more Addition of glass fibers into concrete significantly modifies its tensile strength. The fibers are placed at desired locations and orientations by the matrix surrounding it, thereby making the fibers as principal load carrying members and also protecting them from environmental damage. Glass fibers provide resistance to high temperature, and the ease of incorporating them into the matrix either in continuous or discontinuous lengths. In this work, carbonation test representing the durability of Glass Fiber Reinforced Concrete (GFRC) was carried out, and then experimental program determines the properties like compressive strength, split tensile strength and flexural strength of GFRC for 7 days and 28 days of curing, with percentage of fibers in ratios 0.5%, 1%, 1.5%, 2% and performance of GFRC at elevated temperatures of 300°c, 500°c, 700°c, 1000°c are compared with conventional concrete. The results depict that, the residual compressive strength capacity of GFRC is greater than unreinforced concrete both at elevated and normal temperatures.
Jordan Journal of Civil Engineering, Apr 1, 2016
A large number of studies, experiments and practical test projects have been undertaken throughou... more A large number of studies, experiments and practical test projects have been undertaken throughout the world to assess the modifications in the properties of concrete after addition of rubber aggregates. These rubber aggregates are used to replace fine or coarse aggregates in various proportions. This experimental investigation attempts to study the strength properties and non-destructive evaluation of rubberized concrete with coarse aggregates being partially replaced with rubber aggregates from recycled tyres, in order to assess its suitability for use in structural and non-structural components. Effort was also made to determine the change in thermal properties. It was learnt that the inclusion of rubber in concrete makes the material a better thermal insulator, having a lower coefficient of thermal conductivity. This lower thermal conductivity is a property which could be very useful for meeting energy conservation requirements. Attempt was also made to assess the impact resistance of rubberized concrete. A marked improvement in this property was also observed.
ABSTRACT High performance concrete (HPC) is a mixture of cement, fine aggregate, coarse aggregate... more ABSTRACT High performance concrete (HPC) is a mixture of cement, fine aggregate, coarse aggregate, water and other ingredients. Modeling the compressive strength of HPC (or concrete strength) is a difficult task in building materials because it is influenced by the proportions of various ingredients within the HPC. Researchers have tried to confront this difficulty by modeling the strength of concrete using artificial neural networks (ANN). The influence of ingredients on concrete strength still remains unknown due to the "black box" nature of ANN. This paper investigates the influence of ingredients on concrete strength modeling using feature selection. A robust ANN-model using the knowledge from feature selection has been developed to predict the strength effectively. Experimental results have shown that the proposed model is efficient with respect to runtime and prediction.
Advanced Materials Research, May 1, 2011
Construction field has experienced a growing interest in Fiber Reinforced Concrete (FRC) due to i... more Construction field has experienced a growing interest in Fiber Reinforced Concrete (FRC) due to its various advantages. The disposal of industrial waste especially non biodegradable waste is creating a lot of problems in the environment. In the present investigation, an attempt has been made by using non biodegradable waste (polyester fibers) in the concrete to improve the crack resistance and strength. Concrete having compressive strength of 25MPa is used for this study. Samples were prepared by using various fiber contents starting from 0 to 6% of with an increment of 0.5% for finding Compressive strength, split tensile strength and flexural strengths. It is observed that, compressive strength, split tensile strength and flexural strengths of concretes is increasing as the fiber content is increased up to some extent.
The entire work is aimed to study the behavior of concrete with locally available Industrial wast... more The entire work is aimed to study the behavior of concrete with locally available Industrial waste materials like Ground Granulated Blastfurnace Slag(GGBS) and ROBO sand(quarry dust) as supplementary materials for cement and fine aggregates respectively. Also the plastic waste i.e. High Density Polyethylene (HDPE), Polyethylene Terephthalate (PET), High Density Poly Propylene (HDPP) and POLYESTER in the form of fibers are added to the concrete for further study. Detailed experimental investigation has been carried out to understand the behavior of concrete with these supplementary materials and fibers, results are compared with the conventional design mix concrete. The results are quite encouraging with these supplementary materials in the concrete. The combination of GGBS as cement replacement and ROBO sand as fine aggregates can be replaced in the concrete by 50% and 25% respectively. Use of plastic waste as fibers (3.5%) in the concrete, the strength properties of concrete (load carrying capacity) is increased. Overall the compressive, split tensile and flexural strengths are increasing with the addition of non-biodegradable waste products as fibers and supplementary material.
Materials Today: Proceedings, 2022
International Journal of Civil and Structural Engineering, 2010
... 2 Professor Department of Civil Engg, BITS, Pilani Hyderabad Campus, Jawahar Nagar, Shameer... more ... 2 Professor Department of Civil Engg, BITS, Pilani Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, Ranga Reddy District, Andhra ... OneWay Concrete Slabs Reinforced with GFRP Rebars" International Meeting on Composite Materials, PLAST 2000, Milan, Italy, pp ...
Concrete is one of the most popular building materials. The construction industry is always incre... more Concrete is one of the most popular building materials. The construction industry is always increases its uses and applications. Therefore, it is required to find alternative materials to reduce the cost of concrete. On the other hand, Non-biodegradable waste i.e. water bottles, cool drink bottles and disposable glasses, shredded or crumbed rubber etc., is creating a lot of problems in the environment and its disposal becoming a great difficulty. The objective of this paper is to investigate the use of rubber pieces as coarse aggregate in the concrete. Concrete tested with varying percentages of rubber from 10 to 50% of normal aggregates. Compressive strength, split tensile strength and flexural strength of concrete is measured and comparative analysis is made.
Procedia - Social and Behavioral Sciences, Dec 1, 2013
Cement concrete pavement slabs used in highway construction are planer structures. Apart from reg... more Cement concrete pavement slabs used in highway construction are planer structures. Apart from regular factors considered in analysis of concrete pavements, temperature effects influence the slab size, joint spacing and temperature reinforcement design. The thermal performance of concrete pavement is governed by its thermal properties viz. coefficient of thermal expansion, specific heat and thermal conductivity. Studies have been undertaken to assess the thermal properties of normal concrete. The measurement of thermal conductivity for Self Compacting Concrete (SCC) has been proposed in this paper. SCC is a highly flowable and non-segregating concrete. SCC has the ability to flow through congested reinforcements efficiently irrespective of the structure geometry. An experimental program has been undertaken, to assess the thermal conductivity values for M-40 grade of SCC mixes with manufactured sand. Class C flyash has been used as a cement replacement material. Perlite has been used as fine sand replacement material. The thermal conductivity values were measured using Guarded Hot Plate method (ASTM C177) as recommended in ACI 122R. This paper is an attempt to present the experimental results obtained for thermal conductivity studies undertaken on M-40 grade of SCC with optimized flyash dosage and perlite dosage.
of non bio degradable waste in Concrete slabs
IOP Conference Series: Earth and Environmental Science
Due to urbanization and industrialization, which paved the door for the development of tall, mult... more Due to urbanization and industrialization, which paved the door for the development of tall, multi-story structures on mountainous terrain, land is scarce in emerging nations like India. Buildings built on hilly terrain differ from those built on flat terrain due of their uneven and asymmetrical vertical and horizontal structures. These buildings are also significantly more vulnerable to earthquake pressures when located in mountainous terrain. The primary goal of the current endeavor is to investigate how structures behave on level and sloping terrain. Hilly places require different construction configurations than level areas. Hill structures vary from those on lowlands in that they are torsionally linked, highly irregular, and asymmetrical in both the horizontal and vertical planes. As a result, they are vulnerable to severe damage when an earthquake strikes. The behavior of a multi-story structure with two distinct slope angles was attempted to be studied in this paper, and a co...
International Journal of Engineering and Advanced Technology, 2020
Road widening is the solution for the problem of traffic density and road accidents, transportati... more Road widening is the solution for the problem of traffic density and road accidents, transportation infrastructure is the ever green problem facing all over the world, as day by day with the growth of economic status the people are switched to use four wheelers from two wheeler vehicles, the roads at present are mean for the capacity of the present situation, as the traffic density increases the improvements in road infrastructure and widening of roads are required. We concentrated on the different road widening problems and solutions carried out and mainly focused on the Mysore Bantwal Road (SH-88). The need of this research is to design Road transport model to ensure safe and effective moment of traffic. We even discussed different principles, policies and procedures of the design standards and guidelines. The major aim is to reduce economic losses and to improve capabilities for overlay design that are provided to meet today’s highway traffic needs. Finally we used IIT PAVE softw...
Turkish Journal of Computer and Mathematics Education (TURCOMAT)
In this present study the durability characteristics of Steel fiber reinforced Self compacting co... more In this present study the durability characteristics of Steel fiber reinforced Self compacting concrete (SFRSCC) is determined for M30 and M40 grade concrete mixes. Along with durability strength and sorptivity is carried out and comparison is made with Plane self-compacting concrete (SCC) by chemical resistances, Initial Surface Absorption Test (ISAT). In the present study, the rational mix design procedure for self-compacting concrete is used. SCC mixes contains large quantity of powder (material whose parcel size is 0.125 mm) to maintain the plastic yield of the properties of fresh concrete as per the general guidelines for design of SCC mixes given in the EFNARC (2005). The present project consists of two phases. In the first phase, SCC mixes for different grades are developed without steel fibers and with steel fibers. The mechanical properties like compressive strength of the different grades were studied. In the second phase, based on the experimental results, durability prop...