### HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE

23/03/2015 For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work the use of larger size aggregate will be useful due to the lesser consumption of cement. This will also reduce the heat of hydration and the corresponding thermal stresses and shrinkage cracks. But in practice the ...

More### Aggregate sizes - Concrete

The distribution of particle sizes, known as grading, is important because it effects some properties of the plastic concrete, e.g. water demand and bleeding. A uniform distribution of particle sizes is preferable. Coarse aggregate will not pass through a 4mm sieve. Typically, nearly half the weight of concrete will be coarse aggregate. The nature of the coarse aggregate can have a marked ...

More### How to Choose Quality Coarse Aggregate for Concrete ...

Coarse aggregates with a size of 20 mm or less are commonly used for the majority of concrete construction. One can roughly check the surface texture, particle shape, and cleanliness of the coarse aggregate just by visual observation. However, porosity and gradations require specific laboratory tests.

More### Different Types Sizes of Aggregate for Concrete ...

11/08/2018 [2] COARSE AGGREGATE. Coarse aggregates are particulates that are greater than 9.5mm. The usual range employed is between 9.5mm and 37.5mm in diameter. Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete. Larger aggregate diameters reduce the quantity of cement and water ...

More### PROPERTIES OF AGGREGATES FOR CONCRETE - Civil

These materials can be supplied in either coarse or fine-aggregate sizes. Fine aggregates have 100% of their material passing the 10 mm sieve. Coarse aggregates have the bulk of the material retained on 4.75 mm sieve. Aggregates comprise the greatest volume percentage in portland-cement concrete, mortar, or asphaltic concrete. In a portland cement concrete mix, the coarse and fine aggregates ...

More### Aggregates - Portland Cement Association

Coarse aggregates are any particles greater than 0.19 inch, but generally range between 3/8 and 1.5 inches in diameter. Gravels constitute the majority of coarse aggregate used in concrete with crushed stone making up most of the remainder. Natural gravel and sand are usually dug or dredged from a pit, river, lake, or seabed. Crushed aggregate is produced by crushing quarry rock, boulders ...

More### What is the size of coarse aggregate used in concrete? -

When the size of aggregate is greater than 4.75 mm ( say 5 mm) it is called coarse aggregate. Graded aggregates are used for better particle packing. The larger the size of aggregate lesser the cement required for same strength up to certain grade...

More### Shape, Size - Coarse Aggregates

Coarse aggregates are classified into two main groups: (i) single-size aggregate and (ii) graded aggregate. Single-size aggregate is based on a nominal size specification. It contains about 85 to 100 percent of the material which passes through that specified size of the sieve and zero to 25% of which is retained in the next lower sieve. A graded aggregate contains more than one single-size ...

More### Coarse Aggregates: Types, Properites Applications

The size of the coarse aggregate depends on the use of the concrete is to be poured. For large-scale concreting operations without complex reinforcement, large aggregates of size 80 mm, 40 mm, 20 mm are used. For the simple construction of residential or other buildings, 20 mm is the maximum size will be used. Aggregates are graded in a concrete mix design and the ratio of each size is ...

More### Aggregates for concrete Aggregates sizes for concrete

2) Coarse aggregate:- The aggregate whose size is greater than 4.75 mm is known as coarse aggregate. Stone is also known as coarse aggregate. Stone is also known as coarse aggregate. The size of aggeregates comonly used for prepairing different grade of concrete are given below.

More### PROPERTIES OF AGGREGATES FOR CONCRETE - Civil

These materials can be supplied in either coarse or fine-aggregate sizes. Fine aggregates have 100% of their material passing the 10 mm sieve. Coarse aggregates have the bulk of the material retained on 4.75 mm sieve. Aggregates comprise the greatest volume percentage in portland-cement concrete, mortar, or asphaltic concrete. In a portland cement concrete mix, the coarse and fine aggregates ...

More### Aggregate in Concrete - The Concrete Network

The maximum size of coarse aggregate that can be used in a mix depends on the size, shape, and reinforcing of a member, based on these "not-to-exceed" guidelines (see Photos 5 and 6): 3/4 of the clear spacing between rebar or between rebar and forms (cover distance) 1/3 the depth of the slab. 1/5 the narrowest dimension of a member. Often aggregates are analyzed using combined grading of fine ...

More### What is the size of coarse aggregate used in concrete? -

When the size of aggregate is greater than 4.75 mm ( say 5 mm) it is called coarse aggregate. Graded aggregates are used for better particle packing. The larger the size of aggregate lesser the cement required for same strength up to certain grade...

More### Shape, Size - Coarse Aggregates

Coarse aggregates are classified into two main groups: (i) single-size aggregate and (ii) graded aggregate. Single-size aggregate is based on a nominal size specification. It contains about 85 to 100 percent of the material which passes through that specified size of the sieve and zero to 25% of which is retained in the next lower sieve. A graded aggregate contains more than one single-size ...

More### What is the best size of coarse aggregates for production ...

I need a mix design which can give me 40MPa compressive strength concrete without using coarse aggregates. I am only using sand, water, fly ash, cement and superplasticizer for the mix design ...

More### How coarse aggregate affects the mix design of concrete

07/10/2019 The maximum size of the coarse aggregate dictates how much water will be needed in the concrete mix. It also determines how much fine aggregate will be needed to produce a workable mixture and cohesive concrete batch. The bigger the size of the aggregate, the smaller its bondable surface area becomes for cement, sand and water. This means that less water and fine aggregate is needed

More### Replacement Of Coarse Aggregate In Concrete - [Civil

The size of fine aggregate particles is less than 4.75mm. ... Using the E-waste as a partial replacement of coarse aggregate in concrete is the best solution. We can not fully replace material in concrete because it impacts the workability of concrete. The electronic waste is crushed as required particle size and can be mixed with other aggregates in concrete which will not affect the quality ...

More### Effects of shape and size of aggregates in concrete

Effects of shape and size of aggregates in concrete. Q. How does the shape and size of coarse aggregates affect the properties of concrete? A. Aggregate shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth,

More### Aggregate Properties - The Concrete Portal

Typically, coarse aggregate sizes are larger than 4.75 mm (5 mm in British code), while fine aggregates form the portion below 4.75 mm. A maximum size up to 40 mm is used for coarse aggregate in most structural applications, while for mass concreting purposes such as dams, sizes up to 150 mm may be used. Fine aggregates, on the other hand, have particles up to a minimum size of 0.075 mm ...

More### PROPERTIES OF AGGREGATES FOR CONCRETE - Civil

These materials can be supplied in either coarse or fine-aggregate sizes. Fine aggregates have 100% of their material passing the 10 mm sieve. Coarse aggregates have the bulk of the material retained on 4.75 mm sieve. Aggregates comprise the greatest volume percentage in portland-cement concrete, mortar, or asphaltic concrete. In a portland cement concrete mix, the coarse and fine aggregates ...

More### Classification of Aggregates: Grain Size, Density, Shape ...

Coarse; The size of fine aggregates is defined as 4.75mm or smaller. That is, aggregates which can be passed through a number 4 sieve, with a mesh size of 4.75mm. Fine aggregates include things such as sand, silt and clay. Crushed stone and crushed gravel might also fall under this category. Typically, fine aggregates are used to improve workability of a concrete mix. Coarse aggregates measure ...

More### HOW TO DECIDE MAXIMUM SIZE OF COARSE

For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work the use of larger size aggregate will be useful due to the lesser consumption of cement. This will also reduce the heat of hydration and the corresponding thermal stresses and shrinkage cracks. But in practice the ...

More### Coarse Aggregate - Its 5 [ Grading Shapes ]

13/04/2020 Its size leads to lower water demand in the mixture and has a lower surface area as compared to the small coarse aggregate size and for normal strength concrete rounded shape aggregates provide economical mix design. These aggregates are larger size filler materials in construction and these aggregates are the particles that retain on 4.75mm sieve. Broken bricks,

More### How coarse aggregate affects the mix design of concrete

07/10/2019 The maximum size of the coarse aggregate dictates how much water will be needed in the concrete mix. It also determines how much fine aggregate will be needed to produce a workable mixture and cohesive concrete batch. The bigger the size of the aggregate, the smaller its bondable surface area becomes for cement, sand and water. This means that less water and fine aggregate is needed

More### Effects of shape and size of aggregates in concrete

Effects of shape and size of aggregates in concrete. Q. How does the shape and size of coarse aggregates affect the properties of concrete? A. Aggregate shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth,

More### What is the best size of coarse aggregates for production ...

I need a mix design which can give me 40MPa compressive strength concrete without using coarse aggregates. I am only using sand, water, fly ash, cement and superplasticizer for the mix design ...

More### What's the best size of coarse aggregate in concrete in ...

Generally the size of coarse aggregate used is 10-12.5 mm. If we use the proportional mix of different sizes small to large (>4.5 mm to 20/25 mm), this make the concrete structure compact by align ...

More### (PDF) Aggregates for Concrete Ahmed Ahmed -

The maximum size of coarse aggregate used in concrete has a bearing on the economy of concrete. Usually more water and cement is required for small-size aggregates than for large sizes, due to an increase in total aggregate surface area. for a given water-cement ratio, the amount of cement required decreases as the maximum size of coarse aggregate increases. The increased cost of obtaining and ...

More### Coarse Aggregates: Types, Properites Applications

The size of the coarse aggregate depends on the use of the concrete is to be poured. For large-scale concreting operations without complex reinforcement, large aggregates of size 80 mm, 40 mm, 20 mm are used. For the simple construction of residential or other buildings, 20 mm is the maximum size will be used. Aggregates are graded in a concrete mix design and the ratio of each size is ...

More### Classification Of Aggregates Based On Size And Shape ...

When the aggregate is sieved through 4.75mm sieve, the aggregate retained is called coarse aggregate. Gravel, cobble and boulders come under this category. The maximum size aggregate used may be dependent upon some conditions. In general, 40mm size aggregate used for normal strengths and 20mm size is used for high strength concrete. the size range of various coarse aggregates

More### Classification of Aggregates: Grain Size, Density, Shape ...

Coarse; The size of fine aggregates is defined as 4.75mm or smaller. That is, aggregates which can be passed through a number 4 sieve, with a mesh size of 4.75mm. Fine aggregates include things such as sand, silt and clay. Crushed stone and crushed gravel might also fall under this category. Typically, fine aggregates are used to improve workability of a concrete mix. Coarse aggregates measure ...

More### HOW TO DECIDE MAXIMUM SIZE OF COARSE

For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work the use of larger size aggregate will be useful due to the lesser consumption of cement. This will also reduce the heat of hydration and the corresponding thermal stresses and shrinkage cracks. But in practice the ...

More### Gradation of Aggregate Ultimate Guide - Construction How

04/01/2021 The maximum size of coarse aggregate used in concrete has a bearing on economy. Usually more water and cement is required for small-size aggregates than for large sizes ; The water and cement required for a slump of approximately 3 in. and w/c ratio = 0.54 by wt. is shown in Fig. 4-6; Fig. Cement and water contents in relation to maximum size of aggregates, for air-entrained and non

More### Maximum Aggregate Size - CivilWeb Spreadsheets

For concrete pavements the maximum size of coarse aggregate must be small enough to sit suspended within the fresh concrete mix without breaking the surface of the concrete or impeding the compaction of the concrete. For this reason most national standards limit the maximum size of the aggregate to a proportion of the depth of the slab. BS EN 13877-1 limits the max aggregate size to

More### Classification of Aggregates Based on Size

The size of the aggregate bigger than 4.75 mm is considered as the coarse aggregate i.e. basically, all other aggregates which are retained on 4.75mm IS sieve while sieve analysis is performed. According to sources of coarse aggregates, it can be further classified as: (a) Uncrushed Gravel or Stone: It results from natural disintegration of rock.

More### How coarse aggregate affects the mix design of concrete

07/10/2019 The maximum size of the coarse aggregate dictates how much water will be needed in the concrete mix. It also determines how much fine aggregate will be needed to produce a workable mixture and cohesive concrete batch. The bigger the size of the aggregate, the smaller its bondable surface area becomes for cement, sand and water. This means that less water and fine aggregate is needed

More### (PDF) Aggregates for Concrete Ahmed Ahmed -

The maximum size of coarse aggregate used in concrete has a bearing on the economy of concrete. Usually more water and cement is required for small-size aggregates than for large sizes, due to an increase in total aggregate surface area. for a given water-cement ratio, the amount of cement required decreases as the maximum size of coarse aggregate increases. The increased cost of obtaining and ...

More### Influence of size of aggregates on the Compressive ...

Fresh concrete batches were formulated from each of the coarse aggregate sizes and the slump test was conducted to test for workability. Three cubes (150 mm × 150 mm) were cast from each batch and the compressive strength was determined using a concrete load testing machine after 7 days curing. The results reflected that workability (slump) increased with increasing aggregate size. The ...

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