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Sintered FA, ed slag. Normal-weight ( 2100 kg/m3) Natural ... Sintered Fly Ash. Mix fly ash with coal slurry, pelletise and sinter at 14000C. Properties ... – A free PowerPoint PPT presentation (displayed as an …
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Lightweight ConcreteLightweight Aggregate Concrete CE 342 Concrete Technology Prof. Ravindra Gettu IIT Madras. Definitions: Lightweight concrete has a maximum density of 1900 kg/m3 and is …
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A presentation on aggregates and aggregate properties for concrete, covering mineralogy, types, specifications, tests, and deleterious substances. Learn about the …
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aggregates.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. This document discusses different types of aggregates used in concrete, including their classification, properties, and common tests. It defines aggregates as inert materials mixed with cement or lime to make concrete or …
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Aggregates Critical to the Water Demand • Aggregates take up the largest amount of volume in concrete. • Aggregate particle size, distribution, shape, and texture affect the amount of water needed in concrete. • Therefore, more than any other material, aggregates have the greatest affect on the water needed for a given concrete workability.
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Aggregates for Use In Concrete * Cook out method – ASTM C566 is the most accurate * Always make sure you adjust your mix for moisture.
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9. Classification of Aggregate III. Classification based on unit weight a. Normal weight aggregates: The commonly used aggregates i.e. sand, gravel, crushed rocks such as granite, basalt, sandstone (sedimentary) and limestone. It has specific gravities between 2.5 and 2.7 produce concrete with unit weight ranging from 23 to 26 …
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This document discusses the classification and properties of aggregates used in concrete. It describes three main classifications of aggregates: 1) based on unit weight as normal, heavyweight, or lightweight, 2) based on size as fine or coarse aggregate, and 3) based on shape as rounded, irregular, angular, or flaky.
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It defines aggregates as fillers used with binding materials that are derived from rocks. Aggregates make up 70-80% of concrete's volume and influence its properties. Aggregates are broadly classified into fine aggregates smaller than 4.75mm and coarse aggregates larger than 4.75mm.
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18 Aggregate Characteristics and Tests Abrasion resistance ASTM C 131 (AASHTO T 96), ASTM C 535, ASTM C 779 Freeze-thaw resistance ASTM C 666 (AASHTO T 161), ASTM C 682, AASHTO T 103 Sulfate resistance ASTM C 88 (AASHTO T 104) Particle shape and surface texture ASTM C 295, ASTM D 3398 Grading ASTM C 117 (AASHTO T 11), …
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Concrete has been in use since 3000 BC when the Egyptians built pyramids. In 1824, Portland Cement was invented by Joseph Aspdin. In 1836, the first compressive and tensile tests took place in Germany. The first concrete street was built in in Bellefontaine, Ohio. Air-entraining agents are added to concrete in the 1930's. The …
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3. Introduction Recycled aggregate are comprised of crushed, graded inorganic particles processed from the materials that have been used in the construction and demolition debris. These materials are generally from buildings, roads, bridges, and sometimes even from catastrophes, such as wars and earthquakes. Recycled …
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With a uniquely simplified design using cement gray, this concrete-focused presentation template is perfect for Google Slides and PowerPoint. It allows you to present all the …
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3. INTRODUCTION Recycling is the act of processing the used material for use in creating new product. Aggregates obtained from recycling of construction and demolition waste. Recycled aggregate are comprised of crushed, graded inorganic particles processed from the materials that have been used in the constructions.
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Top Engineering College in Lucknow - BBDU is considered as top engineering college in Lucknow. It is situated in the capital city of Lucknow, Uttar Pradesh and the university comprises 100 acres. Furthermore, it is equipped with top-class facilities such as an auditorium, health club, sports stadium, Wi-Fi and hostels to name a few.
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Batching Effects on Properties of Recycled Aggregate Concretes for Airfield Rigid Pavements. Batching Effects on Properties of Recycled Aggregate Concretes for Airfield Rigid Pavements. Dr. Andres Salas Prof. David Lange Prof. Jeff Roesler. 2010 FAA Technology Transfer Conference and Exposition April 22, 2010. O'Hare Modernization …
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COMPRESSIVE STRENGTH TEST • Cement, fine aggregate and Coarse aggregate (upto 38mm) to be used for making concrete are weighed in the required ratio to be used in field and are thoroughly mixed, by adding requisite amount of water until the concrete appears homogeneous. • The test SPCIMENS are cast in the required sizes of …
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AGGREGATES There are two types of aggregates Coarse Aggregates Fine Aggregates. AGGREGATES There are two types of aggregates Coarse Aggregates Fine Aggregates Fine and coarse …
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2. By the early 1990's, Japan has developed and used SCC. Self compacted concrete is highly engineered concrete with much higher fluidity without segregation and is capable of filling every corner of formwork under its self weight . Thus SCC eliminates the vibration for the compaction of concrete without affecting its engineering properties. As …
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17. Particle size distribution Sieve analysis is done after crushing and sieving as per IS Code 2386 to separate out coarse and fine aggregate. Recycled aggregate meets all the standard requirements of natural aggregate Specific gravity & water absorption Sp. Gravity(saturated surface dry condition) of recycled concrete …
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17. Tests on aggregates a.Texture and shapes test i.e. test for shapes of aggregates: 1. round shape –usually natural aggregates 2. irregular shape- a combination of different shapes 3. angular shape- usually of crushed stone 4. flaky shape- where the thickness is less than its length and width 5. elongated- usually angular where its length …
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The recycled aggregate obtained from demolished concrete was angular, ... These concretes were crushed and turned into aggregates, which were then utilized to create new concrete samples. At ages ...
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1. CONCRETE AGGREGATES. 2. binding medium (mortar) Portland Cement Concrete. relatively inert. filler materials. (aggregates) In concrete mixtures the proportions of …
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35. CONCLUSIONS (contd.) For HSC 30%-40% recycled coarse aggregates with reduced wc ratio may give same output as normal concrete gives. For low grade concrete 50% RCA replacement will give almost equal results as normal concrete gives. Problem in recycled aggregate concrete is that due to the low wc ratio the workability …
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Alkali-Aggregate Reactivity. Chapter 5 Alkali-Aggregate Reaction 5.1 Introduction 5.2 Types of Reactions 5.3 Evaluating Aggregates ... determine the impact on fresh and hardened concretes (other than ASR) Other Chemicals. 5.5 Tests for Evaluating Preventive Measures
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The Nature of Concrete • It is a composite material • Aggregates are 65% - 80% of the volume – Fine aggregate: sand – Coarse aggregate: stone • Cement: General term & applies to any binder – Portland cement – fly ash – ground slag – silica fume • Water
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make air-entrained concrete. Constituents of Concrete • Aggregate • Cement • Water Ingredients: • Limestone • Cement rock • Clay • Iron ore • + (after firing and grinding) • …
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The aggregates used for making concrete are normally of the maximum size 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 600 micron, 300 micron and 150 micron. The aggregate fraction from 80 mm to 4.75 mm are termed as coarse aggregate and those fraction from 4.75 mm to 150 micron are termed as fine aggregate.
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306866725-CIVIL-PROJECT-PPT-RECYCLED-AGGREGATE-CONCRETE.pptx - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. The document summarizes research on using recycled concrete aggregates in rigid pavements. It discusses advantages like cost savings and …
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5. B.) Sedimentary Rock Types of Aggregate • Such rocks are formed by the deposition and subsequent cementation of these materials at the Earth's surface and within water. • Lime stone and sand stone are the example of such rocks • Could be in weak condition as the porosity level is high in lime stone that ranges from 0% to 37% • More …
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A presentation on the role, properties, classification and examples of aggregates in concrete. Learn about the different types of aggregates, their effects on concrete …
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This document summarizes key information about aggregates used in concrete, including: the importance and benefits of aggregates; factors affecting concrete strength; …
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7. b) Manufactured aggregates - expanded clay, shale & slate are produced from natural materials - fly ash & slag are the main industrial waste used to produce lightweight aggregate - vermiculite and perlite manufactured from natural materials can be used to produce low – density concrete - Only aggregates produced by expansion of …
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An optimum percentage replacement of coarse aggregate with coconut shell aggregate is determined from the study. Coarse aggregate made from coconut shells were used in proportions of 5%, 10%, 15%, 20%, 25%, 30% and 35% to replace coarse aggregate in conventional concrete. A constant water to cement ratio of 0.5 was used throughout the …
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5. Aggregates 5 Fine aggregate (Sand) •Particles having diameter in between 4.75 mm to 75 micron is called Sand. •Fills the voids within coarse aggregates •Assists in hardening of cement by allowing water to seep through its voids •Minimizes shrinking and cracking of concrete •Economizes concrete by varying its proportion for …
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Aggregates make up 65-80% of concrete by volume and come in two sizes: fine aggregates smaller than 4.75mm (such as sand) and coarse aggregates larger than 4.75mm (such as gravel). The physical properties of aggregates like shape, texture and grading impact the performance of fresh and hardened concrete.
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