Products The Kistner concrete mix was designed for a relatively high flow of 9 inches to facilitate placement and consolidation of reinforced concrete products with minimum vibration This mix contains coarse aggregate as large as 1/2 inch The slump of such concrete can only be determined through the standard ASTM C 143 / C 143M-97 test...

Effect of the maximum size of coarse aggregate on the main ,

2 The consumption of cement with an increase of the size of the aggregate from 40 to 80 mm, other conditions being equal, decreases by 20–30 kg per 1 m 3 of concrete (Figs 1 and 3), which amounts to 10–12% and, accordingly, the density of the concrete mix increas 3 With an increase of the size of the aggregate from 40 to 80 mm for ....

82 Use coarse aggregate size No 57 (one inch to No 4) or No 67 (3/4 83 inch to No 4) for concrete For conc rete placed in bottom slabs and stems of 84 box girders, use No 67 size aggregate If accepted by the Engineer in 85 writing, smaller size aggregates are permitted when encountering limited 86 space between forms and reinforcement...

How to Calculate Quantities of Cement, Sand and Aggregate ,

and Aggregate required = 0144*1450 = 209 kgs Considering water/cement (W/C) ratio of 055 We can also arrive at the Water required = 50*055 = 275 kg So, One bag of cement (50 Kgs) has to be mixed with 115 kgs of Sand, 209 Kgs of aggregate and 275 kgs of water to produce M20 grade concrete...

On Effect of Size of Aggregate on Self-Compacting Concrete

121 Coarse Aggregate 6 122 Fine Aggregate 7 123 Cement 7 124 Water 8 125 Mineral Admixtures 8 126 Chemical Admixtures 11 , The parameters of study include grade of concrete and effect of size of aggregate The existing Nan Su [2001] method of mix design was based on packing factor for a particular grade of concrete, obtained on ....

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 siz 3 The advantage of small aggregate in the water-ratio strength relationship may or may not be sufficient to ,...

What nominal maximum sizes of aggregate are recommended?

Because maximum aggregate size can impact concrete properties such as shrinkage, and also the cost of concrete, the largest aggregate size consistent with the requirements of 26421 should be permitted With the w/cm fixed, the larger the nominal maximum size of aggregates, the lower the cement content for a given consistency Or, stated ....

Gradation of Coarse Aggregate by Sieve Analysis - Civil ,

Coarse aggregate is the one retained on 475 mm IS Sieve When the aggregate contains sizes differently in suitable proportions, it is called graded aggregate The workability of concrete is also improved with well graded aggregate Single size aggregates make the concrete harsh and does not work well with trowel and between the cables, strands ....

Jan 28, 2012· The water-cement ratio required for the target mean strength of 4825 MPa is 040 Adopt W/C ratio of 040 For 20 mm maximum size aggregate, sand confirming to grading Zone II, water content per cubic metre of concrete = 180 kg and sand content as percentage of total aggregate by absolute volume = 25 per cent...

Density of Cement, Sand and Aggregate, Bulk , - Civil Lead

The Nature of the work decides which size of coarse aggregate should be used The maximum size may be 20 cm for mass concrete, such as in dams etc and 63 mm for plain cement concrete work For reinforced cement concrete work usually, 20 mm size aggregate is preferred For structural concrete common materials like gravel and crushed stone are used...

Please Determine The Approximate Amount (by Weight ,

TABLE 75 Bulk Volume of Coarse Aggregate per Unit Volume of Concrete* Nominal Maximum Size of Aggregate, mm (in) Bulk Volume of Dry-Rodded Coarse Aggregate Per Unit Volume of Concrete for Different Fineness Moduli of Fine Aggregate** Fineness Modulus 24020280 300 95 (%) 125 (%) 19 (34) 25 (1) 375 (1%) 50 (2) 75 (3) 150 (6) 050 059 0 ....

enter the specific gravity of the course aggregate and the fine aggregate Volume of coarse aggregate per unit volume of concrete Nominal maximum size of aggregate, in (mm) Volume of oven-dry-rodded coarse aggregate per unit volume of concrete for different fineness moduli of fine aggregate 240 260 280 300 3/8 (95) 05 048 046 044...

Effect of coarse aggregate size distribution on fracture ,

Jun 01, 2021· Table 1 lists the mix propositions of concrete studied Two water/binder ratios (designated as C30 and C60) and three coarse aggregate gradations (designated as A, B and C, see Fig 2) were designed, and a total of six concrete mixes were producedOrdinary Portland cement PO 425R for C30 and PII 525 for C60 were employed in the mixes in compliance with the Chinese ,...

Size numbers (grading sizes) for coarse aggregates apply to the amounts of aggregate (by mass) in percent-ages that pass through an assortment of sieves (Fig 5-5) For highway construction, ASTM D 448 (AASHTO M 43) lists the same 13 size numbers as in ASTM C 33 81 Chapter 5 Aggregates for Concrete Table 52 Characteristics and Tests of ....

Feb 09, 2014· CON 124 Basic Concrete Mix Design Proportioning Session 8 High Performance Concrete , Optimum content of the coarse aggregate depends on its strength potential characteristics and maximum size Once the optimum coarse aggregate content has been chosen, the oven-dry (OD) weight of the coarse aggregate per yd3 of concrete can be calculated using ....

Construction Standard CS3:2013 – Aggregates for Concrete

Aggregates for Concrete Ir Peter W C Leung, SE C/L Ir David C P Lo, E/Lab2 , BS 1881: Part 124:1988 : , Coarse recycled aggregate used in concrete in accordance with WBTC No 12/2002 : 4 Geometrical Requirements : Grading of Coarse Aggregates : 4 Geometrical Requirements...

Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428 A copy of the complete ASTM...

Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428 A copy of the complete ASTM...

Coarse aggregates are any particles greater than 019 inch, but generally range between 3/8 and 15 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...

AGGREGATES FOR CONCRETE E1-3 sieve and predominantly retained on the 75 µm (No 200) sieve is called “fine aggregate” or “sand,” and larger aggregate is called “coarse aggregate” Coarse aggregate may be available in several different size groups, such as 19 to 475 mm (3/4 in to No 4), or 375 to 19 mm (1-1/2 to 3/4 in)...

Firstly the definition of maximum aggregate size in concrete is the smallest sieve through which of the aggregates will pass The nominal size of aggregate is the smallest sieve which can retain more than 15% of the total aggregates, though this is sometimes taken as the next sieve size down from the maximum aggregate size...

Effect of content and particle size distribution of coarse ,

Coarse aggregate fraction is known to strongly influence both fresh and hardened concrete’s properti Consequently, selection of both content and particle size distribution (PSD) for concrete mixture is an important issue regarding the predicted performance of concrete...

Key points • ‘Aggregate’ is a term for any particulate material It includes gravel, crushed stone, sand, slag, recycled concrete and geosynthetic aggregat Aggregate may be natural, manufactured or recycled • Aggregates make up some 60 -80% of the concrete mix They provide compressive strength and bulk to concrete...

How does the maximum size of aggregate affect the ,

Answer (1 of 2): Water present in concrete is used to hydrate cement which mixes with the fine aggregates to form paste and some is absorbed by the aggregates(coarse ....

Design Specification For Ultra High Strength Concrete ,

It is known that the smaller size aggregate produced higher compressive strength; preferably, the maximum particle size of the coarse aggregate should be set to 20 mm or less Fine Aggregate It is preferable that a finer molecule of the fine aggregate be 28 to 30, to ensure derivable fluidity of the concrete and reduce the viscosity...

Aggregate Size Effects: • As the maximum size aggregate increases, the amount of paste needed for a given slump decreas • 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...

HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE TO ,

Mar 23, 2015· On the other hand in smaller size aggregates the surface area is increased which increases w/c ratio and lower strength is achieved In general for strength upto 200 kg/cm 2 aggregates upto 40 mm may be used and for strength above 300 kg/cm 2 aggregate upto 20 mm may be used Conditions That Decide Maximum Size of Coarse Aggregate ,...

Effect of mix design on the size-independent fracture ,

ing concrete mixes with compressive strength vary-ing from 39 to 124 MPa on their fracture behavior In particular, the influence of the coarse aggregate (CA) volume, compressive strength, water to binder (w/cm) and paste to solid (p/s) ratios on the size-independent fracture energy of concrete (G F) will...