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Fineness modulus is an empirical factor obtained by adding the cumulative percentages of aggregate retained on each of the standard sieves ranging from 80 mm to 150 micron and dividing this sum by 100. Fineness modulus is generally used to get an idea of how coarse or fine the aggregate is. More fineness modulus value indicates that the
Fine aggregate means the aggregate which passes through 4.75mm sieve. To find the fineness modulus of fine aggregate we need sieve sizes of 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm and 0.15mm. Fineness modulus of finer aggregate is lower than fineness modulus of coarse aggregate.
An example provided in the ACI 211 standard states that, 34For 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 dryrodded basis, may be used in each cubic meter of concrete.
Therefore, fineness modulus of coarse aggregates sum cumulative retained 100 717100 7.17 Fineness modulus of 7.17 means, the average size of particle of given coarse aggregate sample is in between 7 th and 8 th sieves, that is between 10mm to 20mm.. Limits of Fineness Modulus
The fineness modulus is computed from screen analysis data by adding the cumulative percentages of aggregate retained on each of a specified series of sieves, and dividing the sum by 100. The sieves used for determining the fineness modulus are No. 100 150 m, No. 50 300 m, No. 30 600 m, No. 16 1.18 mm, No. 8 2.36 mm, No. 4 4
Fineness Modulus. Fineness modulus is an empirical factor obtained by adding the cumulative percentages of aggregate retained on each of the standard sieves ranging from 80 mm to 150 micron and dividing this sum by 100. Fineness modulus is generally used to get an idea of how coarse or fine the aggregate is.
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. The larger the fineness modulus, the more coarse the aggregate. A typical fineness modulus for fine aggregate used in PCC is between 2.70 and 3.00.
The appropriate range of fineness modulus of the sand aggregate used in normal concrete is 3.71.6. Both medium sand and coarse sand spiked with some fine sand coarsefine 41 are applicable. Sand aggregate plays a significant role as a skeleton and in passing the stress in concrete.
The proportions between coarse and fine aggregates will change based on the unique characteristics of each aggregate, the placement method, and the finish desired. The dividing line between fine and coarse aggregate is the 38inch sieve. The fineness modulus FM is an index of the fineness of an aggregate.
DETERMINATION OF FINENESS MODULUS OF COARSE AGGREGATES AND FINE AGGREGATE To find fineness modulus of coarse aggregate we need sieve sizes of 80mm, 40mm, 20mm, 10mm, 4.75mm, 2.36mm, 1.18mm, 0
Inspection amp Sampling Procedures for Fine amp Coarse Aggregates . 9113 TABLE OF CONTENTS CHAPTER ONE TESTING EQUIPMENT Laboratory Fineness Modulus Sieve Analysis for Dense Gradation materials Sampling is perhaps the most important step in assuring that good quality aggregates are being used. Since a sample is just a small portion of the
FINENESS MODULUS OF FINE AGGREGATE TxDOT Designation Tex402A Effective Date August 1999 1. SCOPE 1.1 This method determines the fineness modulus of concrete fine aggregate used in evaluation of natural and manufactured sands for portland cement concrete. 1.2 The values given in parentheses if provided are not standard and may not be exact
How to Check Quality of Steel Bar at Construction Site Duration 2943. L amp T Learning
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
Fine Aggregate Gradation Fineness Modulus Coarse Aggregate Gradation Mixture sieve shall be as stated in the Quality Control Plan. 7. For coarse aggregates, 100 CRDC10480 Method of Calculation of the Fineness Modulus of Aggregate
2 METHOD OF CALCULATION OF THE FINENESS MODULUS OF AGGREGATE Fineness Coarse aggregate Fineness 9100 156 900 156 Modulus 100 100 7.44 Combined Coarse and Fine 6535 Modulus Fineness 9100 302 900 302 Modulus 100 100 5.98 5. Significance and Use A method of selecting mixture proportions
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 re34 ect the condition and characteristics of the aggregate from which the sample is obtained.
The application of fineness modulus and particle size distribution of aggregate is to fine the aggregate is coarse or fine wheather it can be used in making mortar or concrete. If not what corrective action as to be taken is decided upon. Then the particles distribution study given an idea as to weather the material well grade or not.
To establish suitability for use in Agency concrete, MnDOT performs concrete aggregate property testing on fine and coarse aggregate sources in accordance with MnDOT Specifications 3126, 3131 and 3137. Concrete Aggregate Properties include Specific Gravity Absorption Sand Fineness Modulus ASR Aggregate Class Use in Bridge
The same value of fineness modulus may therefore be obtained from several different particle size distributions. In general, however, a smaller value indicates a finer aggregate. Fine aggregates range from a FM of 2.00 to 4.00, and coarse aggregates smaller than 38.1 mm range from 6.75 to 8.00.
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