Scientists Come up with Nanoconcrete for Casting Under Negative Temperature Conditions 28 February 2020
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An Investigation of High-Performance Self Compacting Concrete Under Flexural Loading
Civil Engineering and Architecture 8(6): 1414-1418, 2020 http://www.hrpub.org DOI: 10.13189/cea.2020.080624 An Investigation of High-Performance Self Compacting Concrete under Flexural Loading Theerthananda M P1,*, P C Srinivasa1, G M Naveen2 1Department of Civil Engineering, Government Engineering College, Kushalnagar, India 2Department of Civil Engineering, Government Engineering College, Chamarjanagar, India Received October 20, 2020; Revised November 25, 2020; Accepted December 30, 2020 Cite This Paper in the following Citation Styles (a): [1] Theerthananda M P, P C Srinivasa, G M Naveen, "An Investigation of High-Performance Self Compacting Concrete under Flexural Loading," Civil Engineering and Architecture, Vol. 8, No. 6, pp. 1414 - 1418, 2020. DOI: 10.13189/cea.2020.080624. (b): Theerthananda M P, P C Srinivasa, G M Naveen (2020). An Investigation of High-Performance Self Compacting Concrete under Flexural Loading. Civil Engineering and Architecture, 8(6), 1414 - 1418. DOI: 10.13189/cea.2020.080624. Copyright©2020 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract To shorten construction period, to assure compaction in the structure especially in confined zones where vibrating compaction is difficult and to eliminate noise due to vibration effective especially at concrete 1. Introduction products plants SCC is developed in practice. Also, SCC is applied to tunnel lining for preventing the cold joint High Performance Self Compacting Concrete (HPSCC) Self-compacting concrete has been used. Currently, the is the one which ability to Flow, good viscosity, main reasons for the employment of self-compacting segregation resistance and passing ability. -
Fiber in Continuously Reinforced Concrete Pavements 6
Technical Report Documentation Page 1. Report No. 2. Government 3. Recipient’s Catalog No. FHWA/TX-07/0-4392-2 Accession No. 4. Title and Subtitle 5. Report Date January 2006; Revised December 2006 Fiber in Continuously Reinforced Concrete Pavements 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Dr. Kevin Folliard, David Sutfin, Ryan Turner, and David P. 0-4392-2 Whitney 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Center for Transportation Research 11. Contract or Grant No. The University of Texas at Austin 0-4392 3208 Red River, Suite 200 Austin, TX 78705-2650 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Technical Report 9/1/01–8/31/03 Research and Technology Implementation Office 14. Sponsoring Agency Code P.O. Box 5080 Austin, TX 78763-5080 15. Supplementary Notes Project conducted in cooperation with the Federal Highway Administration and the Texas Department of Transportation. Project Title: Use of Fibers in Concrete Pavement 16. Abstract Continuously reinforced concrete pavement (CRCP) is a major form of highway pavement in Texas due to its increase in ride quality, minimal maintenance, and extended service life. However, CRCP may sometimes experience pavement distress that results in early failure, either due to under-design or the use of poor construction materials. Significant effort has been made to improve the performance of some of these materials (e.g. siliceous river gravel) to achieve an acceptable level of performance but has been unable to provide a practical solution. This research study investigates whether fiber reinforcement may solve some of the problems associated with siliceous river gravel, particularly spalling. -
Experimental Investigation on Nano Concrete with Nano Silica and M-Sand
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 EXPERIMENTAL INVESTIGATION ON NANO CONCRETE WITH NANO SILICA AND M-SAND Mohan Raj.B1, Sugila Devi.G2 1PG Student, Nadar Saraswathi College of Engineering and Technology, Theni, Tamilnadu, India. 2Assistant Professor, Nadar Saraswathi College of Engineering and Technology, Theni, Tamilnadu, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - The influence of Nano-Silica on various material is Nano Silica (NS). The advancement made by the properties of concrete is obtained by replacing the cement study of concrete at Nano scale has proved the Nano silica is with various percentages of Nano-Silica. Nano-Silica is used as much better than silica fume used in conventional concrete. a partial replacement for cement in the range of 3%, 3.5%, Now, the researchers are capitalizing on nanotechnology to and 10% for M20 mix. Specimens are casted using Nano-Silica innovate a new generation of concrete materials that concrete. Laboratory tests conducted to determine the overcome the above drawbacks and trying to achieve the compressive strength, split tensile and flexural strength of sustainable concrete structures. Evolution of materials is Nano-Silica concrete at the age of 7, 14 and 28 days. Results need of the day for improved or better performance for indicate that the concrete, by using Nano-Silica powder, was special engineering applications and modifying the bulk able to increase its compressive strength. However, the density state of materials in terms of composition or microstructure is reduce compared to standard mix of concrete. -
To the One Who Loved Me, Died for Me and Has Been Raised
To the One Who loved me, died for me and has been raised. (Bible 2 Corinthians 5:14-15) Acknowledgements In this age, with the next millennium fast approaching, no one can carry out research work alone. Therefore, the author would like to show his appreciation to the many people who assisted with this study. First, I would like to give thanks to my supervisor Dr. P. L. Domone, who helped with this work, gave valuable suggestions and also corrected my written English patiently. I also appreciated Dr. Y. Xu's kind suggestions and encouragement, and both Dr. K. Ozawa and Dr. J.C. Liu supplied useful information concerning this study. I also enjoyed discussing this research work with my junior colleagues: Mr. V. Sheikh, Mr. E.M. Ahmed and Mrs. J. Jin. Furthermore, Mr A. Tucker and Miss H. Kinloch carried out several mixes concerning the early strength of SCC as their final year project under my guidance. The help I received from the technical staff of the Elvery Concrete Technology Laboratory cannot be ignored, especially from Mr. 0. Bourne and Mr. M. Saytch. Furthermore, I would like to acknowledge the scholarship from my government, without which the dream of studying in this country could not have come true, after having spent 12 years teaching. I especially want to give thanks to my family - my mother, my wife Priscilla and May and Boaz for their support. I owe them very much. I also appreciated the care from the saints in the church - it is impossible to list all of them. -
Proposing a New Method Based on Image Analysis to Estimate the Segregation Index of Lightweight Aggregate Concretes
materials Article Proposing a New Method Based on Image Analysis to Estimate the Segregation Index of Lightweight Aggregate Concretes Afonso Miguel Solak 1,2 , Antonio José Tenza-Abril 1 , Francisco Baeza-Brotons 1 and David Benavente 3,* 1 Department of Civil Engineering, University of Alicante, 03080 Alicante, Spain; [email protected] (A.M.S.); [email protected] (A.J.T.-A.); [email protected] (F.B.-B.) 2 CYPE Ingenieros S.A., 03003 Alicante, Spain 3 Department of Earth and Environmental Sciences, University of Alicante, 03080 Alicante, Spain * Correspondence: [email protected] Received: 18 October 2019; Accepted: 1 November 2019; Published: 5 November 2019 Abstract: This work presents five different methods for quantifying the segregation phenomenon in lightweight aggregate concretes (LWAC). The use of LWACs allows greater design flexibility and substantial cost savings, and has a positive impact on the energy consumption of a building. However, these materials are susceptible to aggregate segregation, which causes an irregular distribution of the lightweight aggregates in the mixture and may affect the concrete properties. To quantify this critical process, a new method based on image analysis is proposed and its results are compared to the well-established methods of density and ultrasonic pulse velocity measurement. The results show that the ultrasonic test method presents a lower accuracy than the other studied methods, although it is a nondestructive test, easy to perform, and does not need material characterization. The new methodology via image analysis has a strong correlation with the other methods, it considers information from the complete section of the samples, and it does not need the horizontal cut of the specimens or material characterization. -
(AUTONOMOUS) Dundigal, Hyderabad- 500 043 CONCRETE TECHNOLOGY (ACE010) IARE-R16 B.Tech V SEM
INSTITUTE OF AERONAUTICAL ENGINERRING (AUTONOMOUS) Dundigal, Hyderabad- 500 043 CONCRETE TECHNOLOGY (ACE010) IARE-R16 B.Tech V SEM Prepared by Mr. N. Venkat Rao, Associate Professor Ms.B.Bhavani, Assistant Professor COURSE GOAL • To introduce properties of concrete and it constituent materials and the role of various admixtures in modifying these properties to suit specific requirements, such as ready mix concrete, reinforcement detailing, disaster-resistant construction, and concrete machinery have been treated exhaustively the and also special concrete in addition to the durability maintenance and quality control of concrete structure. COURSE OUTLINE UNIT TITILE CONTENT I CEMENT Portland cement, chemical composition, Hydration, ADMIXTURE Setting of cement, Structure of hydrate cement, Test & on physical properties, Different grades of cement. AGGREGATE Mineral and chemical admixtures, properties, dosage, effects, usage. Classification of aggregate, Particle shape & texture, Bond, strength & other mechanical properties of aggregate, Specific gravity, Bulk density, porosity, adsorption & moisture content of aggregate, Bulking of sand, Deleterious substance in aggregate, Soundness of aggregate, Alkali aggregate reaction, Thermal properties, Sieve analysis, Fineness modulus, Grading curves, Grading of fine & coarse Aggregates, Gap graded aggregate, Maximum aggregate size. COURSE OUTLINE UNIT TITILE CONTENT II FRESH Workability, Factors affecting workability, CONCRETE Measurement of workability by different tests, Setting times of concrete, Effect of time and temperature on workability, Segregation & bleeding, Mixing and vibration of concrete, Steps in manufacture of concrete, Quality of mixing water. COURSE OUTLINE UNIT TITILE CONTENT III HARDENED Water / Cement ratio, Abram’s Law, Gel space ratio, CONCRETE Nature of strength of concrete, Maturity concept, TESTING Strength in tension & compression, Factors affecting OF strength, Relation between compression & tensile HARDENED strength, Curing. -
Vysoké Učení Technické V Brně Brno University of Technology
VYSOKÉ UČENÍ TECHNICKÉ V BRNĚ BRNO UNIVERSITY OF TECHNOLOGY FAKULTA STAVEBNÍ FACULTY OF CIVIL ENGINEERING ÚSTAV TECHNOLOGIE STAVEBNÍCH HMOT A DÍLCŮ INSTITUTE OF TECHNOLOGY OF BUILDING MATERIALS AND COMPONENTS VLIV VLASTNOSTÍ VSTUPNÍCH MATERIÁLŮ NA KVALITU ARCHITEKTONICKÝCH BETONŮ INFLUENCE OF INPUT MATERIALS FOR QUALITY ARCHITECTURAL CONCRETE DIPLOMOVÁ PRÁCE DIPLOMA THESIS AUTOR PRÁCE Bc. Veronika Ondryášová AUTHOR VEDOUCÍ PRÁCE prof. Ing. RUDOLF HELA, CSc. SUPERVISOR BRNO 2018 1 2 3 Abstrakt Diplomová práce se zaměřuje na problematiku vlivu vlastností vstupních surovin pro výrobu kvalitních povrchů architektonických betonů. V úvodní části je popsána definice architektonického betonu a také výhody a nevýhody jeho realizace. V dalších kapitolách jsou uvedeny charakteristiky, dávkování či chemické složení vstupních materiálů. Kromě návrhu receptury je důležitým parametrem pro vytvoření kvalitního povrchu betonu zhutňování, precizní uložení do bednění a následné ošetřování povrchu. Popsány jsou také jednotlivé druhy architektonických betonů, jejich způsob vyrábění s uvedenými příklady na konkrétních realizovaných stavbách. V praktické části byly navrženy 4 receptury, kde se měnil druh nebo dávkování vstupních surovin. Při tvorbě receptur byl důraz kladen především na minimální segregaci čerstvého betonu a omezení vzniku pórů na povrchu ztvrdlého betonu. Klíčová slova Architektonický beton, vstupní suroviny, bednění, separační prostředky, cement, přísady, pigment. Abstract This diploma thesis focuses on the influence of properties of feedstocks for the production of quality surfaces of architectural concrete. The introductory part describes the definition of architectural concrete with the advantages and disadvantages of its implementation. In the following chapters, the characteristics, the dosage or the chemical composition of the input materials are given. Besides the design of the mixture, important parameters for the creation of a quality surface of concrete are compaction, precise placement in formwork and subsequent treatment of the surface. -
Calculating the Compressive Strength of Concrete Structures Using Effects of Freeze-Thaw Cycles on Electrical Resistivity
Research Article iMedPub Journals Global Environment, Health & Safety 2018 www.imedpub.com Vol.2 No.1: 6 Calculating the Compressive Strength of Concrete Structures Using Effects of Freeze-Thaw Cycles on Electrical Resistivity Soroosh Sobhkhiz1*, Mohammad Hossein Eftekhar2 and Mohammad Shekarchi Zadeh2 1School of Civil Engineering, College of Engineering, University of Tehran, Iran 2Institute of Construction Materials, University of Tehran, Tehran, Iran *Corresponding author: Soroosh Sobhkhiz, School of Civil Engineering, College of Engineering, University of Tehran, Iran, Tel: +989128996097; E-mail: [email protected] Received date: April 06, 2018; Accepted date: May 20, 2018; Published date: May 30, 2018 Copyright: © 2018 Sobhkhiz S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Citation: Sobhkhiz S, Eftekhar MH, Zadeh MS (2018) Calculating the Compressive Strength of Concrete Structures Using Effects of Freeze-Thaw Cycles on Electrical Resistivity. Glob Environ Health Saf. Vol. 2 No. 1: 6. human beings, while they are constantly exposed to harms caused by the environment. Sustainable development involves Abstract meeting present needs without compromising the ability of future generations to meet their needs [2]. The ecological Traditionally, one of the influential parameters in criteria for sustainable development are the preservation of concrete structures sustainability has been the number of biodiversity and adoption of human activities to the natural freeze-thaw cycles over the life period of concrete resources and tolerance of nature [3]. structures. Since some regions in the world have highly variable climates, freeze-thaw cycles are one of the most Fatigue-induced damages are one of the main contributor important factors that decreases the lifetime service of factors in structural components failure [4-6]. -
Nano Concrete and Its Classified Applications in Nano Technology
NANO CONCRETE AND ITS CLASSIFIED APPLICATIONS IN NANO TECHNOLOGY 1ANUPRIYA P. JADHAV, 2A. P. PATIL, 3 D. D. PARKHE, 4S. D. BHAGAT, 5RAJENDRA PAWAR 1,2,3,4,5 MAHARASHTRA ENGINEERING RESEARCH INSTITUTE, NASHIK, MAHARASHTRA, INDIA . Email: [email protected] Abstract - This paper presents a modified design of Nanotechnology, which is one of the most active research areas that include a Number of disciplines including civil engineering and construction materials. In this paper, nano –silica has been replaced in various properties such as 2.5%, 3%, 3.5% to the weight of cement. Then the properties of concrete such as compressive strength of respective specimens were tested after 7 & 28 days of curing. Result has been obtained & compared with normal concrete mix. Nano concrete was concluded to have a higher strength than the ordinary concrete. Nanotechnology is the understanding, control, and restructuring of matter on the order of nano meters (i.e., less than 500nm) to create materials with fundamentally new properties and functions. The main advances have been in the nano science of cementitious materials with an increase in the knowledge and understanding of basic phenomena in cement at the nano scale. Keywords - Nano Scale, Asr, Nano Tube, Nano Silica, Polycarboxylates, Atomic Scale, Nano Concrete. I. INTRODUCTION C. WHAT IS NANO CONCRETE? A concrete made with portland cement particles that A. GNERAL are less than 500nm as a cementing agent. Nano Nanotechnology encompasses main approaches: (i) concrete is concrete made by filling the pores in the top down” approach, in which larger structures are conventional concrte using nano particals of size less reduced in size to the nano scale while maintaining than 500 nm.Currently cement particle sizes range their original properties order constructed from larger from a few nano-meters to a maximum of about 100 structures in to their smaller, composite parts and (ii) micro meters. -
Experimental Study on Partial Replacement of Cement with Fly Ash and Complete Replacement of Sand with M Sand P.SRIDEVI1, DR
Experimental Study On Partial Replacement Of Cement With Fly Ash And Complete Replacement Of Sand With M sand P.SRIDEVI1, DR. K. CHANDRAMOULI2 1Assistant Professor, Dept of Civil Engineering, NRI Institute of Technology, Visadala(V), Medikonduru(M), Guntur, AP, India, E-mail: [email protected]. 2 Professor& HOD, Dept Of Civil Engineering, NRI Institute Of Technology ,Visadala(V), Medikonduru(M), Guntur, AP, India, E-mail: koduru [email protected]. ABSTRACT Due to rapid growth in construction activity, the available sources of natural sand are getting exhausted & also, good quality sand may have to be transported from long distance, which adds to the cost of construction. In some cases, natural sand may not be of good quality. Therefore, it is necessary to replace natural sand in concrete by an alternate material partially, without compromising the quality of concrete. Quarry sand is one such material which can be used to replace sand as fine aggregate. The present study is aimed at utilizing Quarry sand as fine aggregate replacing natural sand and also the compressive strength of the water cured specimens is measured on the 7,14,28 Days. Split Tensile strength, Flexural Strength, Here we have conducting a test on concrete by using fly ash and m sand. By using these materials we have find out strength on a concrete by adding partial replacement on cement with fly ash and complete replacement of sand with m sand. Key words:: Experimental Study, Partial Replacement, Cement, Fly Ash, Sand, M sand. 1.INTRODUCTION Concrete is the most widely used construction material in civil engineering industry because of its high structural strength, stability, and malleability. -
Eindhoven University of Technology MASTER Study on Bond Capacity Of
Eindhoven University of Technology MASTER Study on bond capacity of 3D printed concrete with cable reinforcement Dezaire, S. Award date: 2018 Link to publication Disclaimer This document contains a student thesis (bachelor's or master's), as authored by a student at Eindhoven University of Technology. Student theses are made available in the TU/e repository upon obtaining the required degree. The grade received is not published on the document as presented in the repository. The required complexity or quality of research of student theses may vary by program, and the required minimum study period may vary in duration. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain STUDY ON BOND CAPACITY OF 3D PRINTED CONCRETE WITH CABLE REINFORCEMENT GRADUATION THESIS S. Dezaire Eindhoven University of Technology Department of the Built Environment Master Architecture, Building and Planning Specialization Structural Design Title: STUDY ON BOND CAPACITY OF 3D PRINTED CONCRETE WITH CABLE REINFORCEMENT Report number: A-2018.225 Version: Published Date: 12-8-2018 Student: S. (Steven) Dezaire ID-number: 0810235 E-mail: [email protected] [email protected] Graduation committee: First supervisor: dr. -
Mechanical Properties of Circular Nano-Silica Concrete Filled Stainless Steel Tube Stub Columns After Being
Nanotechnol Rev 2019; 8:600–618 Research Article Qingjie Lin, Yu Chen*, and Chao Liu Mechanical properties of circular nano-silica concrete filled stainless steel tube stub columns after being exposed to freezing and thawing https://doi.org/10.1515/ntrev-2019-0053 Received Dec 04, 2019; accepted Dec 20, 2019 Nomenclature Abstract: Experimental research on circular nano-silica f c Nano-silica concrete strength concrete filled stainless steel tube (C-CFSST) stub columns C-CFSST Circular nano-silica concrete-filled stainless after being exposed to freezing and thawing is carried steel tube out in this paper. All of forty specimens were tested in Es Elastic modulus of steel this paper, including nine C-CFSST specimens at normal D Outside diameter of circular stainless steel tube temperature, 28 short columns of C-CFSST for freeze-thaw H Height of the column treatment and three circular hollow stainless steel stub N Number of freezing and thawing cycles columns. The failure mode, load-displacement curves, Nu Ultimate strength of specimens load-strain curves and load-bearing capacity were ob- Neu Experimental ultimate load-bearing capacity tained and analyzed in this paper. The main parame- Nau Ultimate strength of C-CFSST stub columns without ters explored in the test include the number of freeze- being exposed to freezing and thawing thaw cycles (N=0, N=50, N=75, and N=100), wall thick- Ncu Calculated ultimate load-bearing capacity of C-CFSST ness (T=1.0mm, T=1.2mm, T=1.5mm) andnano-silica con- stub columns after being exposed to freezing and crete strength (fc=20MPa, fc=30MPa, fc=40MPa).