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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ABSTRACT Concrete has been the most preferred construction material for over five decades. It is being increasing day to day all over the world due to its versatility‚ mould ability‚ high compressive strength and many more advantages. For several years beginning in 1983‚ the problem of the durability of the concrete structures was a major topic of interest in Japan. The creation of durable concrete structures requires adequate compaction by skilled workers. One solution for the achievement of durable
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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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PRECAST CONCRETE STRUCTURES VISVODAYA ENGINEERING COLLEGE DEPARTMENT OF CIVIL ENGINEERING KAVALI-524201 PAPER PRESENTATION BY Author 1: Author 2: D.chanikya ‚ Ch.Lokesh
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object thereby strengthening it. The idea of pretensioned concrete has been around since the late 19th century‚ but its use was limited by the quality of materials available at the time. It wasn’t until the 1920s that materials of a suitable quality were available in sufficient quantity to allow pretensioned concrete to be used with confidence. The pioneers of this field were Freyssinet‚ Magnel and Hoyer. Description: In pre-tensioned concrete tensile elements such as cables‚ ribbons‚ or rods are clamped
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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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