HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE TO BE …

For heavily reinforced concrete members the nominal maximum size of the aggregate should be usually restricted to 6 mm less than the minimum clear distance between the main bar or 5 mm less than the minimum cover to the reinforcement, whichever is less.

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Minimum Aggregate Size for Flatwork - -Concrete ...

2005-07-12· I have numerous school site projects in Southern California, that require new concrete flatwork. The specificatons, which I wrote, specify a mix design of compressive strength minimum 4000psi, W/C ratio 0.50 maximum, with 1 inch aggregate passing 95-.

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Aggregates for Concrete - Civil Engineering

The important characteristics of aggregates for concrete are listed in Table 5-2 and most are discussed in the following section: Grading. Grading is the particle-size distribution of an aggregate as determined by a sieve analysis (ASTM C 136 or AASHTO. 80. Design and Control of Concrete Mixtures EB001. Table 5-1. Rock and Mineral Constituents in Aggregates. Minerals Igneous rocks Metamorphic ...

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What is the effect of coarse aggregate size in compressive ...

When we design mix the concrete, its target strength is much less than the compressive strength of the aggregates used in the formation. It can also be clearly seen in the mix design procedure that greater the maximum size of coarse aggregate used, less is the cement required to achieve the target strength.

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Ontario Provincial Standards For Roads & Public Works

The nominal maximum size of the aggregate shall be that MTO Sieve Designation larger than the largest designated sieve on which a minimum of 10% of the aggregate is retained. a. Concrete Structures, Sidewalks, Curb and Gutter

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What are the advantages of using maximum sized aggregate ...

The maximum size of aggregates generally used in concrete can be as large as possible within the specified limit. However, in any case, it should not greater than the minimum thickness of the structural …

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Designing Concrete Mixtures - Civil Engineering

ACI Mix Design Table 1. Recommended Slumps for Various Types of Construction ACI Mix Design 3. Maximum aggregate size-- The largest maximum aggregate size that will conform to the following

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Concrete Mix Attributes, Instructions and Slumps

Select the maximum aggregate size, the larger the aggregate of the concrete mix, the better for minimizing shrinkage and curling. Using ACI table 6.3.3, estimate the water and air content. Select the water-cement ratio for the concrete mix.

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ACI 211.1: Maximum Aggregate Size For Concrete Mix Design

Hence, concretes with the larger-sized aggregates require less mortar per unit volume of concrete, and of coarse it is the mortar which contains the most expensive ingredient, cement. Thus the ACI method is based on the principle that the maximum size of aggregate should be the largest available so long it is consistent with the dimensions of the structure.

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Aggregate size| Concrete Construction Magazine | Concrete ...

At a given water ratio, within the range employed in most structural concrete, smaller maximum sizes of aggregate will tend to produce higher concrete strengths than larger ones. 2. The larger sizes will require less mixing water and hence, for a given cement factor, will produce concrete of lower water-ratio than the smaller sizes. 3. The advantage of small aggregate in the water-ratio ...

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Example Specification for Concrete using Current Building ...

Example Specification for Concrete using Current Building Code Requirements DISCLAIMER: This specification is an example that accompanies a seminar titled The P2P Initiative: Performance-based Specs for Concrete and is used for demonstration purposes only .

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MATERIAL SPECIFICATION FOR AGGREGATES - CONCRETE - …

C 330-99 Lightweight Aggregates for Structural Concrete . C 666-97 Resistance of Concrete to Rapid Freezing and Thawing . 1002.03 DEFINITIONS . For the purposes of this specification, the following definitions apply: Air-Cooled Blast-Furnace Slag means the material resulting from solidification of molten blast-furnace slag under atmospheric conditions. Subsequent cooling may be accelerated by ...

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AASHTO Pavement Thickness Design Guide - CECALC.com

Concrete properties – Modulus of Elasticity (Ec) and Modulus of Rupture (S’c). S’c is the 28 S’c is the 28 day Flexural Strength of the concrete.

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GENERAL SPECIFICATION FOR CIVIL ENGINEERING WORKS …

16.14 (1) The minimum cementitious content of designed mix concrete of Grade 20 or above using 20 mm nominal maximum aggregate size shall be as stated in Table 16.2.

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Classification of Aggregates Based on Size and Shape ...

Classification of Aggregates Based on Size. Aggregates are available in nature in different sizes. The size of aggregate used may be related to the mix proportions, type of work etc. the size distribution of aggregates is called grading of aggregates.

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Specification Limits on Slab-on-Grade Placement Size

ACI 301-10 "Specifications for Structural Concrete" added a new section on Industrial Floor Slabs. This section includes minimum default specification provisions for ground-supported industrial ...

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Aggregate Size - Concrete Engineering general discussion ...

2007-02-18· For 24" thick concrete I would use 1-1/2" aggregate minimum (I wouldn't consider 3/4"). I don't know what ACI 3.3.2 stipulates but use the max size aggregate you can to minimize shrinkage and temperature gain. Also gradation is quite important for temp gain.

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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 ...

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What is the minimum concrete column dimension in ACI 318 ...

There is a limitation on C1/C2 , that minimum amount is 3 . Where C1 and C2 are dimensions of column . iii. 4/3 Max. Aggregate size. 3- Least dimension of the column should be equal to or greater ...

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minimum aggregate size for structural concrete

Maximum Aggregate Size Information . ACI 318 recommends that the maximum aggregate size not exceed one-fifth of the narrowest dimension between the sides of the forms, one-third of the depth of slabs, nor three-quarters of the minimum clear spacing between individual reinforcing bars or prestressing tendons.

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Too Little Cover| Concrete Construction Magazine ...

The minimum concrete cover requirements are based on exposure conditions and rebar size. In your case, the slab is not exposed to weather or in direct contact with ground, allowing for the 3/4-inch cover, provided the rebar is No. 11 or smaller.

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Concrete Mix Design Guide - CECALC.com

Step 2, Choice of maximum aggregate size: If the maximum aggregate size is not specified, determine the maximum aggregate size for the mix. Take into consideration

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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)

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What is the minimum thickness of a slab? - Quora

In residential buildings , the slab thickness is kept as 115mm. However, there could be locations where this is 150mm( for example in the sunk slabs.) In case of any industrial buildings, the slab thickness could go up-to 200mm specially if there ...

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