Aggregates for Concrete Aggregates are inert granular materials such as sand‚ gravel‚ or crushed stone that‚ along with water and cement‚ are an essential ingredient in concrete. Aggregates are the most mined materials in the world. For a good concrete mix‚ aggregates need to be clean‚ hard‚ strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete. Aggregates‚ which account for 60 to 75 percent of the total volume
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Abul Kalam Azad‚ and Mohammed Abdul Hameed A STUDY OF SELF-COMPACTING CONCRETE MADE WITH MARGINAL AGGREGATES Shamsad Ahmad∗‚ Abul Kalam Azad‚ and Mohammed Abdul Hameed Department of Civil Engineering King Fahd University of Petroleum & Minerals Dhahran‚ Saudi Arabia 1. INTRODUCTION Self-compacting concrete (SCC)‚ developed first in Japan in the late 1980s‚ represents one of the most significant advances in concrete technology in the last two decades. SCC was developed to ensure adequate compaction
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CONSTRUCTION METHODS AND TECHNOLOGY READY MIX CONCRETE SUBMITTED TO: SUBMITTED BY: PROF. SACHIN JAIN SONABH DHARIWAL VARUN GOEL [pic] INTRODUCTION: Ready-mix concrete is a type of concrete that is manufactured in a factory or batching plant‚ according to a set recipe‚ and then delivered to a worksite‚ by truck mounted transit mixers. This results in a precise mixture‚ allowing specialty concrete mixtures to be developed and implemented on construction
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built taller than __ stories because of economical considerations. A. 1 B. 3 C. 4 D. 5 4. From a fire fighting standpoint‚ what is the advantage of the exposed wood framing in heavy-timber and post-and-beam construction? A. visibility of structural deterioration B. easier reapplication of fire-proofing materials C. higher combustion temperatures of exposed surfaces D. elimination of combustible voids 5. A typical means of achieving a one-hour fire resistance for Type V-A construction is to
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Engineering B45 Concrete Lab Report Introduction: Concrete is a mixture of sand and rock or similar inert material (aggregates) held together by a cementing material. Usually the cementing material is Portland cement‚ but sometimes binders such as asphalt or gypsum are used‚ in which case the concrete may be called asphaltic concrete or gypsum concrete. Properties of concrete are governed not only by the properties of its ingredients (cement‚ water‚ sand‚ and coarse aggregate) but also‚ to a great
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Corrosion of reinforced concrete Contents 1. Introduction 3 2. Corrosion 3 2.1 Chloride attack 4 2.2 Carbonation 5 3. Minimising corrosion 6 3.1 Metallic coatings 6 3.2 Cathodic protection 7 3.3 Other solutions 8 4. Conclusion 8 References 10 List of Figures 2.1 Chloride attack on reinforced concrete…………………………………………....4 2.2 Carbonation attack of RC due to poor concrete cover…………………………….5 3.1 How impressed current cathodic protection stops corrosion ……………………
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Advantages of mix design Mix design aims to achieve good quality concrete at site economically. I. Quality concrete means • Better strength • Better imperviousness and durability • Dense and homogeneous concrete II. Economy a) Economy in cement consumption It is possible to save up to 15% of cement for M20 grade of concrete with the help of concrete mix design. In fact higher the grade of concrete more are the savings. Lower cement content also results in lower heat of hydration and hence
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Ian Wendt August 17‚ 2011 Roman Pozzolanic Concrete The Roman Empire has contributed a wide variety of knowledge‚ ideas and technology to the world. These include novel concepts regarding the legal system‚ Roman numerals‚ architecture and the Roman calendar. However‚ the development of concrete as a building material is not the first thing that comes to mind when considering the Roman contributions to civilization. While the use of concrete predates the Roman era‚ the Romans discovered important
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Aggregates is a major part of concrete‚ it is of urgent need that we look into the influence of aggregate on the fresh as well as hardened properties of concrete. Better grading of aggregate not only will show better results in the properties of the concrete but will also help in saving expensive materials such as cement‚ fly ash and admixture. In the comparative study of influence of the aggregate on high strength concrete‚ here is an attempt to study strength characteristics of cubes and cylinders
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MECHANICAL COMPACTION OF CONCRETE: A GOVERENING FACTOR FOR DURABILITY AND SERVICEABILITY OF THE CONCRETE Ranchhod Mata1‚ Prof. Jayeshkumar Pitroda2‚ Prof. J. J. Bhavsar3 1Student of first year M.E (C.E & M)‚ B.V.M Engineering College‚ Vallabh Vidyanagar 2Assistant Professor and Research Scholar‚ Civil Engineering Department‚ B.V.M. Engineering College‚ Vallabh Vidyanagar-Gujarat-India 3Associate Professor and PG Coordinator (M.E C E & M)‚ Civil Engineering Department‚ B.V.M. Engineering College
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