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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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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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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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Aggregates for Use In Concrete * Cook out method – ASTM C566 is the most accurate * Always make sure you adjust your mix for moisture. * * * When you dealing with specific gravity you are using it to calculate absolute volumes …..Do not confuse with Bulk Volumes (An Example (1) Cement bulk volume 94 lbs / cubic foot (2) Cement absolute volume …
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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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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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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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Geopolymer concrete ppt - Download as a PDF or view online for free ... no further strength loss -no visible cracks up to 600 οC -minor cracks at 800 οC -GPC with more compatability between aggregates and matrix led to less strength loss • Bond strength -very high -about one third of its compressive strength -four times than that 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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12. Pumice aggregate Pumice stone is a natural lightweight aggregate which is formed by the sudden cooling of molten volcanic matter. Pumice is formed during the volcanic eruption of viscous magma. Pumice is notably one of the most common and the oldest of naturally occurring aggregates utilized lightweight coarse aggregates …
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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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The function of the coarse aggregate is to act as the main load- bearing component of the concrete. >Fine aggregate: Aggregate passing No.4(4.75mm) sieve and predominately retained on the No.200 (75µ) sieve. The fine aggregate serve the purpose of filling all the open space in between the coarse particles. 4
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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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Recycled Asphalt Market to see huge growth by 2029 - Recycled concrete is a recently popular material for contractors in developing countries. Manufacturing recycled concrete aggregates is economical and straightforward. While recycled concrete can be transported virtually anywhere, reusing the concrete at its original site has several benefits that can …
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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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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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Aggregates generally occupy 60% to 75% of the concrete volume and strongly influence the concrete's fresh and hardened properties, mixture proportions, and economy. Fine …
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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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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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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 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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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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Recycled-Concrete-Aggregate.pptx - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. The document discusses recycled concrete aggregate which can be obtained from demolishing old concrete structures. It notes that rapid construction has increased costs and depleted …
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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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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 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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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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15 Deleterious Substances Item Mass % of Total Sample Clay lumps and friable particles 3.0 Material finer than 75 micron (No. 200) sieve: Concrete subject to abrasion 3.0* All other concrete 5.0* Coal and lignite: Where surface appearance of concrete is of importance 0.5 1.0 Source: Table 1 Limits for Deleterious Substances in Fine Aggregate for Concrete, …
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