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In concrete slabs the nominal maximum size should not exceed threefourths of the minimum clear spacing of reinforcing bars or onethird of the section depth ACI 3021R The commentary R26421a5 of ACI 31819 states that the size limitations on aggregates are provided to facilitate placement of concrete around the reinforcement without honeycombing due to blockage by closely
CONCRETE 101 A guide to understanding the qualities of What aggregate size can we pump and size delivery system must be used ACI 304 suggests that the maximum size of angular crushed stone coarse aggregate be limited to onethird of the smallest inside diameter of the delivery system 4 What is lightweight concrete How will it
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Variation in the size of Aggregates changes the water demand cement content microcracking strength in concrete It also effects pumpability and durability of concrete Grading of aggregates depends on the proportions of coarse and fine aggregate If grading of aggregate is varied it also changes cement paste content cost economy workability of the mix
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Size The maximum size of a wellgraded coarse aggregate of a given mineralogy can have two opposing effects on the strength of normal concrete With the same cement content and consistency concrete mixtures containing larger aggregate particles require less mixing water than those containing smaller aggregate
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Maximum size should not be larger than 15 the minimum dimension of structural members 13 the thickness of a slab or 34 the clearance between reinforcing rods and forms These restrictions limit maximum aggregate size to 15 inches except in mass applications Current thought suggests that a reduced maximum aggregate size for a given wc
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Concrete Mix Design Calculation for M20 M25 M30 Concrete with Procedure Example Concrete mix design is the process of finding right proportions of cement sand and aggregates for concrete to achieve target strength in structures
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The total content of fine aggregate in kg per cubic metre of concrete for various maximum size of coarse aggregate is shown in Table 2050 Step by step design calculations for a pumpable concrete mix Step 1 Draw the grading curve of aggregate Fig 2015 shows a more acceptable grading curve for pumpable concrete using 20 mm max size aggregate
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Maximum smallest sieve through which 100 percent of the aggregate sample particles pass Superpave defines the maximum aggregate size as one sieve larger than the nominal maximum size Roberts et al 1996 1 Nominal maximum largest sieve that retains some of the aggregate particles but generally not more than 10 percent by weight
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Maximum Aggregate Size Maximum aggregate size will affect such PCC parameters as amount of cement paste workability and strength In general ACI recommends that maximum aggregate size be limited to 13 of the slab depth and 34 of the minimum clear space between reinforcing bars
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Coarse aggregate is one of the essential components of concrete and occupies the largest volume in the mix That is why it greatly affects the concrete mix design Its properties such as strength maximum size shape and water absorption influence water demand the quantity of cement and fine aggregate in concrete mixture It is reported
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Jul 12 2005 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 WC ratio 050 maximum with 1 inch aggregate passing 95100
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15 X max aggregate size 15 X the bar diameter 15 inches Per the AASHTO spec dropping to 34 max aggregate size doesnt help That assumes the concrete will be vibrated In drilled shafts which do not get vibrated the limit in the newer LRFD spec is 5 X the max aggregate size
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The largest size of aggregate particles present in sufficient quantity to affect the physical properties of concrete generally designated by the sieve size on which the maximum amount permitted to be retained is 5 or 10 by weight
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In general smaller size aggregates have been shown to produce higher strength concretes for a fixed wcp ratio However the use of the largest possible coarse aggregate may be an important consideration in terms of optimizing modulus of elasticity creep and drying shrinkage of the concrete
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Jun 01 2019 Normally socalled pea gravel aggregates of 38 size is the lower bound in local Southern California use Larger aggregates 34 to 1 are more costeffective while aggregates smaller than 38 often result in excessive shrinkage The 3
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Mar 21 2016 Coarse aggregates The nominal maximum size of the coarse aggregate is limited to onethird of the smallest inside diameter of the pump line for crushed aggregates or 40 percent of the smallest inside diameter of the pump line for wellrounded aggregates
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A Cement paste shrinks and most aggregates dont so increasing the aggregate content reducing the paste content reduces shrinkage To produce a workable concrete a small maximumsize aggregate such as pea gravel requires a higher sand content than does a larger maximumsize aggregate
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Typically coarse aggregate sizes are larger than 475 mm 5 mm in British code while fine aggregates form the portion below 475 mm A maximum size up to 40 mm is used for coarse aggregate in most structural applications while for mass concreting purposes such as
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c Aggregates The maximum size of crushed aggregate is limited to onethird of the smallest inside diameter of the hose or pipe based on simple geometry of cubical shape aggregates For uncrushed rounded aggregates the maximum size should be limited to 40 percent of the pipe or hose diameter
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Effects of maximum aggregate size MAS on brick aggregate concrete was studied MAS was varied from 125 to 500 mm cement contents from 375 to 400 kgm 3 Sand to total aggregate ratio was varied from 040 to 045 WC from 045 to 055
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Jan 15 2016 For example coarse aggregate has a standard grading requirement for each different size from 1 to 8 A 1 aggregate is a nominal size of 3 to 1 inches and a 8 aggregate is a nominal size of 38 to 0094 inch More specifically a 57 aggregate is the combination of 5 and 7 aggregates ranging from 1 to 019 inch
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Observing the results in figure 6 it is shown that the maximum aggregate size effect on concrete strength emulates the cement content factor effect as it is clear from the comparison of the
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Aggregate Size Effects As the maximum size aggregate increases the amount of paste needed for a given slump decreases The maximum aggregate size used in a concrete mix is dictated by the size of the structural member and the spacing between reinforcing steel Design Control of Concrete Mixtures 14 th Edition Portland Cement
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The smallest sieve opening through which the entire amount of aggregate is permitted to pass is called the nominal maximum size For example for the aggregate meeting the specification limits shown below would have a maximum size of 375 mm 112 in and a nominal maximum size of 250 mm 1 in
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The effect of maximum size of aggregate on concrete strength Q Does the nominal maximum size of the aggregate affect the strength at a given cementitious material content A As the nominal maximum size of the aggregate is increased the amount of water needed for the same workability is reduced
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