• Nominal Maximum Size The smallest sieve opening through which the entire amount of aggregate is permitted to pass •Example ASTM C33 requires that 100 of a 57 coarse aggregate MUST pass the 1 5 sieve but 95 - 100 MAY pass the 1 sieve therefore 57 aggregate is considered to have a Maximum size of 1 5 and an
Fine aggregates generally consist of natural sand or crushed stone with most particles passing through a 3 8-inch sieve Grading refers to the determination of the particle-size distribution for aggregate Grading limits and maximum aggregate size are specified because these properties affect the amount of aggregate used as well as cement
ii Maximum sum of soft and chert particles of 4 0 percent by weight MTM 110 and iii Maximum Loss by Washing per MTM 108 of 2 0 percent 3 Fine Aggregate Requirements a Fine aggregate includes all aggregates particles passing the No 4 sieve b The fine aggregate must meet the requirements of subsection 902 08 902 04 Chip Seal Aggregates
Jul 21 2016· 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 …
All of the particles are approximately the same size Very little fine aggregate thus lots of void space between particles D = maximum particle size Produces the highest density and lowest void content CIVL 3137 24 Aggregate gradation curves a maximum density gradations for 37 5 and
Concrete is a mixture of cement sand or other fine aggregate and a coarse aggregate that for most purposes is up to 19… concrete Aggregate s are generally designated as either fine ranging in size from 0 025 to 6 5 mm 0 001 to 0 25 inch or coarse from 6 5 to 38 mm 0 25 to 1 5 inch or larger
Mar 23 2015· 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 to be Used in Concrete The following conditions decide the maximum size of coarse aggregate to be used in concrete
To obtain high strength concrete coarse aggregate size is usually held to a maximum size of 19 mm but additional cement is required for the additional surface area The fine aggregate can generally contain less material passing 300 um and 150 um sieve because of the higher cement content
Jul 23 2020· Nominal maximum size It is defined as the sieve opening size immediately smaller than the smallest through which all aggregates must pass Essentially the nominal maximum size of aggregate is usually one size below the maximum size Nominal maximum size can retain approximately 0 to 15 percent of the material As per IS 456 the nominal
For fine aggregate no weight shall be in excess of 4 gm in 2 7 kg m 2 3 Coarse Aggregates After the material has been sieved remove each tray weigh each size and record each weight to the nearest 0 1 g Be sure to remove any aggregate trapped within the sieve openings by gently working from either or both sides with a trowel or
Jul 03 2014· To describe an aggregate by its maximum and minimum size is not sufficient It has to be graded from its minimum to maximum size IS-383 recommends the following grading limit for fine aggregates Grading Limits For Fine Aggregates Sieve Size Percentage of Passing For Grading Zone-I Grading Zone-II Grading Zone-III Grading Zone-IV 10 mm 100 …
Jan 01 2012· Haque et al 1 studied the effects of size distribution of both fine and coarse aggregate and maximum coarse aggregate size on concrete compressive strength They …
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 37 5 mm 1-1 2 in and a nominal maximum size of 25 0 mm 1 in
Effect of nominal maximum aggregate size and aggregate gradation on the surface frictional properties of hot mix asphalt mixtures Article PDF Available in Construction and Building Materials 244
Mar 27 2017· Fine Aggregate If the aggregate size is less than 4 75mm then it is called as Fine aggregate The minimum size of fine aggregate is 0 075mm is preferred for concreting works Coarse Aggregate If the aggregate size is more than 4 75mm then it
The graded coarse aggregate is defined by its nominal size i e 40 mm 20 mm 16 mm 12 5 mm etc For example a graded aggregate of nominal size 12 5 mm means an aggregate most of which passes the 12 5 mm IS Sieve
1 Maximum Aggregate Size The maximum size of coarse aggregate is one of the factors that controls water demand to achieve certain workability It also dictates quantity of fine aggregate content needed for producing cohesive mix For a given weight higher the maximum size of aggregate lower is the surface area of coarse aggregates and vice
Mar 02 2018· 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
1 Concrete is made with aggregate particles of maximum size between 10 mm and 50 mm 2 Fine aggregate called sand has a size between 75 Micron and 4 5 mm Coarse aggregate has size greater than 4 5 mm 3 Bond between aggregate and cement paste is not important factor in the strength of concrete 4 The specific gravity of an aggregate is the mass of the aggregate in the air divided
Superpave defines nominal maximum aggregate size as one sieve size larger than the first sieve to retain more than 10 percent of the material Roberts et al 1996 It is important to specify whether maximum size or nominal maximum size is being referenced Gradation An aggregate s particle size distribution or gradation is one of its
Jan 24 2013· By the CT 382 definition the maximum aggregate size is 3 4 and the nominal maximum aggregate size is 1 2 In the November 2011 version of CT 202 nominal maximum aggregate size is defined as one sieve size larger than the first size to retain more than 10 By this definition the nominal maximum aggregate size for the material example
Maximum Size Of Concrete Aggregate shows these limits for fine aggregate and for one size of coarse aggregate There are several reasons for specifying grading limits and nominal maximum aggregate size they affect relative 82 Design and Control of Concrete Mixtures EB001 Fig 5-4
The purpose of the fine aggregate is to fill the voids in the coarse aggregate and to act as a workability agent Also See Measuring Workability Properties of Aggregates also has effect on resulting concrete e g variation in size grading texture shape and strength of aggregates means variation in the properties of resulting concrete
Fine aggregate should fall within gradation limits provided in ASTM C 33 Section 6 If there is a deficiency in a locally available fine aggregate concrete may benefit from the addition of air entrainment additional cement or a supplemental cementitious material SCM to address these shortcomings The maximum size of coarse aggregate
Maximum size is 150mm How are aggregates classified by source Natural or artificial Large size up to 150mm Angular and rough Low porosity Low cost Attribute of lightweight aggregate Synthetic Weak 2 3 to 3 and are usually for fine aggregate
The shape and the texture of aggregate particles their grain size distribution and the maximum size of the coarse aggregates may decrease the volume of entrained air Du and Folliard 2005 For a constant cement and AEA dosage the volume of entrained air increases when increasing the dosage of the fine aggregate
