Most Important Point In This Article

## Fineness Modulus of Fine Aggregate:

The sand fineness module (fine aggregate) is an index number describing the mean size of sand particles. By doing sieve analysis with normal sieves, it is measured.

The accumulated percentage kept on each sieve is applied and the sum of the fine aggregate is subdivided by 100.

To find the fine aggregate fineness modulus, we require **4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, and 0.15mm sieve sizes**.

The fineness modulus of the finer aggregate is greater than the coarse aggregate fineness module.

## Fineness Modulus of Coarse Aggregate:

The fineness modulus of coarse aggregates is the index number of the total particle size of the coarse aggregate.

By doing sieve analysis with normal sieves, it is measured. The accumulated percentage retained on each sieve is applied and the coarse aggregate valuation is given by subdividing it by 100.

The fineness module is larger than the fine aggregate, thus the fineness module of the coarse aggregate is greater than the fine aggregate.

We require sieve sizes of **75mm, 37.5mm, 19mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm and 0.15mm** and determine the coarse aggregate fineness modulus.

The Fineness module is the number that is identified when we calculate the particle size from the lower order standard sieves to the higher-order sieve. So, we require all sizes of sieves in the coarse aggregate measurement.

## Sieve Analysis:

Analysis of the sieve helps to determine the distribution of the particle size of the coarse and fine aggregates. This is achieved by sieving the aggregates according to IS: 2386 (Part I)-1963.

As standardized by the IS code, we use various sieves in this and then pass aggregates through them and thus collect various-sized particles leftover various sieves.

The equipment used are-

**#1.** 80mm, 63mm, 50mm, 40mm, 31.5mm, 25mm, 20mm, 16mm, 12.5mm, 10mm, 6.3mm, 4.75mm, 3.35mm, 2.36mm, 1.18mm, 600μm, 300μm, 150μm and 75μm.

**#2.** Balance or scale with precision to measure 0.1% of the test sample’s weight.

The available sample weight should not be less than the weight given below:

**Procedure to Determine the Distribution of Aggregates by Particle Size.**

- The test sample is dried and measured at a steady weight at a temperature of 110 + 5
^{0} - A set of IS sieves is used to sieve the sample.
- The substance on each sieve is weighed upon completion of the sieve.
- As a proportion of the overall sample weight, the average weight moving through each sieve is measured.
- The fineness module is obtained by applying to each sieve the total percentage of aggregates maintained and by dividing the sum by 100.

Also, Read: What Is Specific Gravity Cement | Why We Calculate Specific Gravity Cement | Specific Gravity Test on Cement

## Sieve Analysis of Fine Aggregate:

One of the most relevant experiments conducted on-site is the Sieve analysis of Sand. Aggregates are neutral materials which are combined for mortar or concrete manufacture with binding materials such as cement or lime. It’s also found in mortar and asphalt as fillers.

The size of the aggregate ranges from several inches to the size of the smallest sand particle. In general, the aggregates occupy 60 to 75 percent of the concrete volume or 70 to 85 percent by weight and greatly affect the freshly mixed and hardened properties, mixture proportions, and economy of the concrete.

All IS 4.75 mm sieve pass aggregates and known as fine aggregates. In order to determine conformity with the design, quality control criteria, and verification parameters, all aggregate technicians use a sieve analysis (gradation test) to determine the gradation (particle size distribution, by size, within a given sample).

The sieve analysis is really useful for the monitoring and quality acceptance technique used in combination with other studies.

Gradation implies the distribution of the scale of the particles within the overall size range. On a graph, gradation can be classified as well-graded, uniform, or gap graded (sometimes referred to as skip graded), listed below.

- Well graded means the sizes are in nearly equal proportions across the whole range, although the largest and smallest particles would be very different.
- Uniform gradation means that the particles have a significant proportion of the same dimension. Gap graded or skip graded means that with a few particles of an intermediate scale, most particles are high in size or tiny in size.
**Targets:**The whole sieve analysis technique is to determine the distribution of the particle size of the fine aggregates and to determine if it is appropriate for use in concrete mixing.

**Equipment for Testing**

**#1.** Sieves for IS 75 mm, 36 mm, 18 mm, 600 mic, 300 mic, 150 mic, 75 mic.

**#2.**Shovel and Skillet.

**#3.** Balance or scale with an accuracy representing 0.1 percent of the sample’s weight.

**#4.** Mechanical sieve shaker.

**#5.** Fine aggregates of 1000 grams.

### Sieve Analysis Test Procedure-

**Step 1.** Dry the sample at a temperature of 110+ 5^{0} C at a constant weight.

**Step 2.** Next the sieve and put the sample on the top sieve in order to reduce the scale of the opening from top to bottom.

**Step 3.** Shake the sieves for a suitable time, say 15 times or 28 minutes, by hand or by mechanical apparatus. A correct series (forward and backward motion, left and right motion, clockwise (CW) and counter-clockwise (CCW) motion and regular jolting) should be done by the manual process.

**Step 4.** Restricted the volume of material on a given sieve such that all objects have the ability to enter the opening of the sieve several times during the sieving process. For sieves with openings greater than 4.75 mm, the weight maintained on each sieve shall not exceed 6 kg/m2 (4 g/in2) of the sieving surface at the end of the sieving operation.

**Step 5.** In the case of sieves with apertures of 4.75 mm and wider, the weight in kg/m of the sieving surface must not exceed 2.5 of the product (sieve opening in mm). In no case shall the weight be so high as to cause the sieve cloth to be permanently deformed.

**Step 6.** Continue sieving for a reasonable amount of time and in such a way that no more than 1 percent of the residue on any particular sieve can move through the sieve after 1 minute of continuous hand sieving after completion.

**Step 7.** Place the fine aggregate sample in the top sieve, place the cap on top of the sieve stack, and agitate for 10 to 15 minutes by using the mechanical sieve shaker.

**Step 8.** Carefully extract the sieves one at a time and, with its retained aggregate, measure each sieve. Calculate the material mass stored on each sieve, deducting the resulting sieve’s weight. Determine the weight of each rise in size by measuring the nearest 0.1 percent of the overall initial dry sample weight on a scale or balance.

**Step 9.** The overall substance weight after sieving should be carefully checked with the original sample weight put on the sieves. If depending on the initial dry sample weight, the sum varies by more than 0.3 percent, the data can not be considered for approval purposes.

Also, Read: Non-Destructive Testing of Concrete | Type of Non-Destructive Testing Concrete

### Calculation of Sieve Analysis Test

- Calculate passing ratios, cumulative percentage held, or percentages to the nearest 0.1 percent in separate scale fractions on the basis of the total weight of the original dry sample.
- Calculate the fineness modulus (FM) by applying to the sample the average amount of content that is coarser than any of the normal flowing sieves (Cumulative percentage retained) and by dividing the number by 100:150-m (No. 100), 300-m (No. 50), 600-m (No. 30), 1.18-mm (No. 16), 2.23-mm (No. 8), 4075-mm (3/8-in), 37.5-mm (1.5-in) and wider (3 in or 6 in). If any non-standard sieve is used, apply the total percent retention of this sieve during FM measurement to the next lower-sized standard sieve.

### Report of Sieve Analysis Test

The following are included in the report:

- The absolute proportion of material moving through each sieve, or
- The overall proportion of material retained on each sieve or on each sieve
- Percentage of material between consecutive sieves maintained
- Report the fineness modulus to the nearest 0.01 as necessary.

Also, Read: Lab Test on Aggregates at Site

**Sand Zone Classification:**

IS Sieve | Zone 1 | Zone 2 | Zone 3 | Zone 4 |

10 mm | 100 | 100 | 100 | 100 |

4.75 mm | 90 – 100 | 90 – 100 | 90 – 100 | 90 – 100 |

2.36 mm | 60 – 95 | 75 – 100 | 85 – 100 | 95 – 100 |

1.18 mm | 30 – 70 | 55 – 90 | 75 – 100 | 90 – 100 |

600 microns | 15 – 34 | 35 – 59 | 60 – 79 | 80 – 100 |

300 microns | 5 – 20 | 8 – 30 | 12 – 40 | 15 – 50 |

150 microns | 0 – 10 | 0 – 10 | 0 – 10 | 0 – 15 |

## Table for Fine Aggregate:

SIEVE NO. | SEIVE SIZE | SIEVE WITH MATERIAL | WEIGHT OF SIEVE | MATERIAL RETAINED | % MATERIAL RETAINED | CUMULATIVE % RETAINED | % FINER |

TOTAL |

## Table for Coarse Aggregate:

SIEVE NO. | SEIVE SIZE | SIEVE WITH MATERIAL | WEIGHT OF SIEVE | MATERIAL RETAINED | % MATERIAL RETAINED | CUMULATIVE % RETAINED | % FINER |

TOTAL |

Also, Read: Test for Compressive Strength of Brick | Water Absorption | Dimensions Test

### Sieve Analysis Procedure-

**The fineness modulus** of fine aggregate varies from 2.0 to 3.5mm.

**Values of ****Fineness Modulus of Sand**.

Type of Sand | Fineness Modulus Range |
---|---|

Fine sand | 2.2 mm – 2.6mm |

Medium sand | 2.6 mm – 2.9 mm |

Coarse sand | 2.9 mm – 3.2 mm |

### Fineness Modulus of Fine Aggregate-

**Sieve analysis** is a technique used to determine the particle size distribution of a powder. This **method** is performed by sifting a powder sample through a stack of wire mesh **sieves**, separating it into discrete size ranges. A **sieve** shaker is used to vibrate the **sieve** stack for a specific period of time.

### Fineness Modulus of Coarse Aggregate-

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 an FM of 2.00 to 4.00, and **coarse aggregates** smaller than 38.1 mm range from 6.75 to 8.00.

### Sieve Analysis of Sand-

Fineness modulus of **sand** (fine aggregate) is an index number which represents the mean size of the particles in **sand**. 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 fineness modulus.

### Sieve Analysis Test Procedure-

**Step 1:** Take a representative oven-dried sample that weighs approximately 500g.

**Step 2:** If particles are lumped or conglomerated, crush the lumps but not the particles using the pestle and mortar.

**Step 3:** Determine the mass of the sample accurately – Weight (g).

** Step 4:** Prepare a stack of **test sieves**.

**Step 5:** Weigh all the sieves and the pan separately.

**Step 6:** Pour the samples from step 3 into the top of the stack of sieves and put the lid on, place the stack in the sieve shaker and fix the clamps, adjust the timer to between 10 and 15 minutes, and switch on the shaker.

**Step 7:** Stop the sieve shaker and measure the mass of each sieve and retained soil/material.

### Sand Zone Classification-

It divides the **sand** in four **zones** i.e. from **Zone** I to **Zone** IV. **Zone** I–**Sand** being very coarse and **Zone** 4 **sand** is very fine. It is generally recommended by code to use **sands** of **zones** I to **Zone** III for Structural concrete works.

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