Jul 30, 2016· Fineness modulus of coarse aggregates represents the average size of the particles in the coarse aggregate by an index number. It is calculated by performing sieve analysis with standard sieves. The cumulative percentage retained on each sieve is added and subtracted by 100 gives the value of fine aggregate.
An example provided in the ACI 211 standard states that, "For a fine aggregate having a fineness modulus of 2.8 and a 37.5mm nominal maximum size of coarse aggregate, the table indicates that 0.71m3 of coarse aggregate, on a dry-rodded basis, may be used in each cubic meter of concrete.
Mar 14, 2018· To find fineness modulus of coarse aggregate we need sieve sizes of 80mm, 40mm, 20mm, 10mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm and 0.15mm. Fineness modulus is the number at which the average
Sep 01, 2014· Fitness modulus of coarse aggregate with maximum size 20 mm is 6.00 -6.90 Fitness modulus of mixed aggregate with maximum size 20 mm is 4.70 -5.10
The finest fractions of the fine aggregate are no longer essential to increase workability or prevent segregation; a coarser grading (fineness modulus 2.7 to 3.0 or BS 882 Class C) (British Standards Institution, 1992) is therefore appropriate. The gradings curve of the fine aggregate should, however, generally be smooth and free of gap grading to optimize the water demand.
To find fineness modulus of coarse aggregate we need sieve sizes of 80mm, 40mm, 20mm, 10mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm and 0.15mm. Fineness modulus
Aggregates which mainly pass a 4-mm sieve are termed ‘fine’ aggregates. The coarseness or fineness of sands is described by d/D sizes in mm of 0/1, 0/2 and 0/4. A further classification is provided based on either the percentage passing a 500-μm sieve (Table 15.7) or the fineness modulus, for coarse, medium and fine grading sands (C, M and F).
According to the fineness modulus (MX), the specifications of machine-made sand can be divided into 4 types: coarse, medium, fine and extra fine: 1. Coarse Sand: the fineness modulus is 3.7-3.1, and the content of particles larger than 0.5mm exceeds 50% of the total weight, and the average particle size is
Fineness Modulus of grading of aggregate Fineness modulus is an empirical factor computed from the sieve analysis. It is defined as the sum of the cumulative percentages retained on the sieves of the standard series ranging from 80mm to 150microns and dividing the sum by 100.
For aggregates used in PCC, another common gradation description for fine aggregate is the fineness modulus It is described in ASTM C 125 and is a single number used to describe a gradation curve It is defined as: The larger the fineness modulus, the more coarse the aggregate.
Oct 03, 2018· Fineness Modulus is an indication grading of particle size. More the value of FM more coarser the aggregate is. Now because density vary with particle size, and also the void spaces inside the concrete is a function of aggregate size, it is very i...
Mar 07, 2016· How to calculate Fineness Modulus Procure to determine Fineness Modulus. Sieve the aggregate using the appropriate sieves (80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron & 150 micron) Note down the weight of aggregate retained on each sieve.; Calculate the cumulative weight of aggregate retained on each sieve.; Find out the cumulative percentage of aggregate
Nov 12, 2016· Coarse sand. Good for concrete works. • Others. FM is Fineness Modulus (Click here to see how its calculated) VARIOUS LAB TESTS ON SAND. Fineness Modulus, Silt test, Specific Gravity, Water absorption, Bulk density etc. (All These Tests are available here) QUALITIES OF GOOD SAND. 1. Good sand should have coarse and angular grains of pure
fineness modulus has more voids in it and more particle surface, thus, more paste is needed to fill voids and cement the particles together than would be needed for a coarser sand. Below is an example of the mechanical sieve analysis results of a fine and coarse aggregate with the fineness modulus computed. FINE AGGREGATE COARSE AGGREGATE SIEVE
Sep 25, 1970· 2.1.2 Crushed Stone Sand Fine aggregate produced by crushing hard stone. 2.1.3 Crushed Grace1 Sand line aggregate produced by crushing natural gravel. . 2.2 Coarse Aggregate -- Aggregate most of which is retained on 4*75-mm IS Sieve and containing only so
This video contains about the fineness modulus in aggregate. This video contains about the fineness modulus in aggregate.
Fineness Coarse aggregate Fineness = 9(100) 156 = 900 156 Modulus 100 100 = 7.44 Combined Coarse and Fine 65:35 Modulus Fineness = 9(100) 302 = 900 302 Modulus 100 100 = 5.98 5. Significance and Use A method of selecting mixture proportions for concrete based on the fineness modulus of the combined fine and coarse aggregate was proposed
SIEVE ANALYSIS AND FINENESS MODULUS Sampling Since the reason for sampling aggregates is to determine the gradation (particle size) of the aggregate, it is necessary that they be sampled correctly. The results of testing will re" ect the condition and characteristics of the aggregate
modulus hence fineness modulus of coarse aggregate is higher than fine aggregate. To find fineness modulus of coarse aggregate we need sieve sizes of 75mm, 37.5mm, 19mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm and 0.15mm. Fineness modulus is the number at which the average size of particle is known when we counted from lower order sieve