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

The purpose of this paper is to evaluate the effects of volume of coal washery rejects (CWR) on the strength properties of concrete.0%, 20%, 30%, 40% and 50% in volume of natural aggregates in the concrete mixes were replaced by an equal volume of CWR aggregates. The compressive, splitting and flexural strength properties were determined at different curing periods and compared to M 25 grade of conventional concrete (CC). From the results, it is observed that the increase in CWR replacement level decreased the strength properties. The percentage decrease in compressive strength from 20% to 30% CWR replacement was 2.55%, 3.29% and 3.72% at 7, 28 and 56 days respectively. But beyond 30%, the decrease was very much significant. Hence, it is concluded that 30% CWR replacement is considered as optimum and can be recommended for safe structural concrete. During coal washing process, large quantities of impure coal so called coal washery rejects (CWR) are getting accumulated and posing disposal problems. As the construction industry is the feasible application to reuse waste materials, this investigation is mainly intended to introduce CWR as an alternative to coarse aggregate and study the mechanical properties of CWR based concrete.

World University root node

Department of Environmental and Water Resources Engineering

School of Civil Engineering

Vellore Campus

Department of Structural and Geotechical Engineering

Asian Journal of Civil Engineering

Strength properties of concrete containing coal washery rejects as coarse aggregate

The use of fly ash and metakoalin in concrete is phenomenal due to superior pozzolanic action which accounts for the strength gain and reduction in concreting cost. Recently there has been a great demand for high quality concrete structures with high performance. The present study aims the influence of fly ash and metakoalin on the hardened properties of concrete. The strength properties of compressive, split tensile and flexural strength and electrical resistivity of ternary blend concrete mixes has been tested at different ages. The addition of metakaolin to concrete mix improves the early age strength. The electrical resistivity values of different concretes measured at different ages. Prediction of electrical resistivity of ternary mixes at 28 day has an error of 4-5%. © 2015, Sphinx Knowledge House. All rights reserved.

International Journal of ChemTech Research

Assessment of strength and electrical resistance of ternary blend concrete

This article examines the capability of Least Square Support Vector Machine (LSSVM) and Relevance Vector Machine (RVM) for determination of compressive strength (f c) of self compacting concrete. The input variables of LSSVM and RVM are Cement (kg/m3)(C), Fly ash (kg/m3)(F), Water/powder (w/p), Superplasticizer dosage (%)(SP) Sand (kg/m3)(S) and Coarse Aggregate (kg/m3)(CA). The output of LSSVM and RVM is f c. The developed LSSVM and RVM give equations for prediction of f c. A comparative study has been done between the developed LSSVM, RVM and ANN models. Experiments have been conducted to verify the developed RVM and LSSVM. The developed RVM gives variance of the predicted f c. The results confirm that the developed RVM is a robust model for prediction of f c of self compacting concrete. © 2014 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg.

VIT Unitversity

KSCE Journal of Civil Engineering

Prediction of compressive strength of self-compacting concrete using least square support vector machine and relevance vector machine

This paper focus on the usage of treated waste water in the production of concrete so that the shortage and cost using potable water can be greatly reduced. In this paper, it t is chosen treated waste water, which give us the exact idea of corrosion and for the construction as well as strength and durability properties of the concrete. To determine the mechanical properties of concrete cast cube specimens using M 20 grade concrete with potable and treated waste water. Water absorption test in order to determine the difference in absorption capacity. The other tests, which are conducted include Rapid Chloride Penetration Test (RCPT), sulphate and chloride test are conducted on potable as well as treated waste water at 7, 14 and 28 days. Concrete cast with treated waste water attained more compressive strength when compared with concrete cast with potable water and the chloride permeability is high for treated waste water concrete compared to potable water concrete.

International Journal of Chemical Sciences

Effect of treated waste water on the properties of hardened concrete

This paper deals with replacement of cement in concrete by ground granulated blast furnace slag (GGBFS) with different replacement levels. The strength and chloride penetration of concrete mixes determined by replacing 40%, 50%, 60% and 70% of cement with GGBFS. Total five slag based concrete mixes of different mix proportions were used. For each mix standard sizes of cubes, cylinders and prisms were cast and tested for mechanical properties and rapid chloride penetration at different ages of curing. The obtained results were compared with control concrete and the mix contains 50% replacement with GGBS perform better strength and chloride penetration compared with all other concrete mixes.

The effect of GGBS on the strength and chloride penetration of concrete

This report investigates the suitability of replacement of river sand by granite fines in proportions, based on laboratory test results such as compressive strength, split tensile strength, and flexural strength of concrete. M25 grade concrete was used and the mix design wasa done according to the IS method. The tests are conducted by using granite fines in proportions with river sand 0%, 20%, 30%, 40%, 50%, 60% and 100% of river sand replaced by granite fines. Standard cubes have been casted and cured for 7 and 28 days for compressive strength and cylinders, prisms have been casted and tested for 28 days for split tensile and flexural strength tests. The test results proved that the compressive strength, split tensile strength, flexural strength increase till about 30% of river sand replaced by granite fines beyond which the strength of concrete decreases. The use of granite dust has increased the strength and durability of concrete considerably upto certain extent. © Research India Publications.

International Journal of Applied Engineering Research

Influence of granite fines as sand replacement in concrete mix

Concrete structures often exhibit distress during their service life due to one or more of the following causes: faulty design, use of substandard materials, poor construction, misuse or overloading. Of these, poor construction practices result in porous concrete which necessitates remedial and strengthening measures, if a structure is to meet the strength, serviceability and durability requirements, for which it has been originally designed. However, before strengthening the structure, the integrity of the concrete should be restored, which is often carried out through grouting using cement slurry, followed by grouting with epoxy or low viscous monomer. Grouting using cement slurry to fill up the voids in porous matrix of the concrete is the most simple and economical method, requiring less capital investment and skills. However, there are problems associated with cement grouting, such as shrinkage, stability of the grouts, etc. These problems associated with cement grouting can be solved by using cementitious grouts, i.e., grouts containing supplementary cementitious materials (SCMs) such as fly ash, ground granulated blast furnace slag (GGBS) and silica fume (SF) as admixtures in cement grout. This paper gives the results of the investigation undertaken to evaluate the flow, strength and durability characteristics of the cementitious grouts. © 2002 Elsevier Science Ltd. All rights reserved.