Aggregates For Concretes Ppt

2. Shape: Shape of aggregate plays an important role in coarse aggregate rather than fine aggregate. 3. Strength: The strength of aggregate alone cannot ensure strength of concrete. Strength of coarse aggregate is more important. 4. Surface Texture: Generally rough surfaced aggregate is preferable to smooth aggregates.

3. INTRODUCTION: The high demand for concrete in the construction using normal weight aggregates such as gravel and granite drastically reduces the natural stone deposits and this has damaged the environment thereby causing ecological imbalance (Short and Kinniburgh, 1978). In developed countries, the construction industries have identified many …

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.

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 environmental benefits.

Role of Aggregates in Concrete: Concrete is basically a mixture of two components Paste (Portland cement, water, and air) Aggregate (sand, gravel, crushed stone) The aggregate occupies 70-75% of the volume of concrete, so its quality is of great importance.

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), ASTM C 136 …

14. Experimental Study of Light Weight Concrete by Partial Replacement of Coarse Aggregate Using Pumice Aggregate CASE STUDY14 Coarse Aggregate Crushed stone coarse aggregate conforming to IS 383 – …

Aggregates - Download as a PDF or view online for free. 10. 10 Weight Examples of Aggregates Used Uses for the Concrete ultra-lightweight vermiculite, ceramic, diatomite, pumice, scoria, perlite, can be sawed or nailed, also used for its insulating properties (250 to 1450 kg/m3). lightweight expanded clay, shale or slate, crushed brick used primarily for making lightweight …

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 aggregate(RCA) was found from …

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, ASTM C 33.

High density concrete uses heavy aggregates like magnetite, iron ore, or manufactured aggregates like iron or lead shot. It can achieve densities up to 5900kg/m3 with iron aggregates or 8900kg/m3 with lead shot aggregates. ... . Very heavy concretes can be achieved with iron or lead shots as aggregates having densities of about 5900kg/m³ and ...

Learning Objective Develop a basic understanding of aggregates and aggregate properties. Most concrete problems are a result of lack of control of the variables in the materials and …

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 aggregates make up the bulk of a concrete mixture. Sand, natural gravel and crushed stone are mainly used for this purpose. COURSE AGGREGATES. 805 …

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, …

3 Aggregates of Concrete 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 aggregates (left) generally consist of natural sand or crushed stone with most particles smaller than 5 mm (0.2 in.).

3. The aggregate occupies The aggregate occupies ~ ~70-75% of the 70-75% of the volume of concrete, so its quality is of volume of concrete, so its quality is of great importance. great importance. Aggregates may affect the following Aggregates may affect the following properties of concrete: properties of concrete: – Strength Strength – Durability Durability – …

In the modern era of superplasticizer-based concrete technology, water demand (or specific surface) of aggregate is a significantly underestimated factor influencing cement …

Classification of Aggregates • Aggregates are broadly classified as: • Fine aggregates • Coarse aggregates. Fine Aggregates • Particles of fine aggregates pass through 4.75mm(No.4) sieve .Most commonly used fine …

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

In this type of concrete cement is used as a binding material, sand as fine aggregates and gravel, crushed stones as coarse aggregates. 6. In cement concrete useful proportions of its ingredients are 1 part cement:1-8 part sand:2-16 parts coarse aggregates. USES cement concrete is commonly used in buildings and other important engineering works ...

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 196.56 lbs / cubic foot …

Defects from overvibration include (1 ) segregation as vibration and gravity causes heavier aggregates to settle while lighter aggregates rise; (2) loss of entrained air in air-entrained concrete; (3) excessive form deflections or form damage; (4) form failure caused by excessive pressure from vibrating the same location too long.

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 mortar.

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 aggregate is generally produced by …

Materials for Making concrete - 1. aggregates. Aggregate is a term for any particulate material. It includes gravel, crushed stone, sand, slag, recycled …

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 …

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 aggregates …

Studies have shown that concretes made with max agg size greater than 40mm have lower strength. Because of the smaller surface area for the bond ... The PowerPoint PPT presentation: "CONCRETE AGGREGATES" is the property …

Civil engineering is rapidly evolving with the natural, political and environmental development. Due to a shortage of natural resources, to sustainable development and environmental certificationsrequire-ments, recycling of aggregates is increasingly valued.Research is done everywhere in the world (in 2016, more than a hundred doctoral subjects were proposed in this …

9. How toproduce recycle aggregate concrete Crushing and screening systems start with primaryjaws, conesand/or largeimpactor takingrubblefrom 30inches to 4 feet. Asecondary cone or impactor may or may not need to be run, and then primary and secondary screensmayor maynot beused, depending upon the project, the equipment usedand the final …