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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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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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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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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Date | 16 April 2013 | Page No. | 1 | Title: Standard Operating Procedures of Making a Concrete Block. | Department/ Unit: | This Standard Operating Procedures has been done by Department of Production and Manufacturing of Concrete Block | Purpose: | The purpose of this Standard Operating Procedures of making a concrete block is to provide instructions in order to manufacture a concrete block. | Who can perform this SOP: | Skilled worker technician. | Equipment/ Tools Needed:
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Introduction Concrete mixtures can be designed to provide a wide range of mechanical and durability properties to meet the design requirements of a structure. The compressive strength of concrete is the most common performances measure used by engineer in designing buildings and other structures. The compressive strength is measured by breaking concrete specimen in a compression-testing machine. The compressive strength is calculated from the failure load divided by the cross-sectional area resisting
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placed between the two BS 5400 results‚ or close to the lower values. The Eurocode 2 results were usually reasonably close to the mean of the other results. The CEB-FIP-1990 results were consistently the lowest for high steel stresses and high concrete cover values. Results with varying spacing were close to Eurocode 2 results. The ACI 318 results were consistently the highest‚ being close to and
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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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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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introduction of concrete as a construction medium and the true arch as a structural component made it possible for the Romans to build strong‚ elaborate‚ expansive structures that would endure the test of time. Concrete Roman concrete‚ called opus caementicium‚ was made by mixing traditional lime mortar with stone aggregate called caementa. This material used less water and was very thick compared to modern concrete; therefore it was laid rather than poured (Roman Architecture‚ n.d.). Concrete was an important
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