Question: What Is Meant By Fineness Modulus?

Which aggregate is best for concrete?

Both gravel and crushed stone are generally acceptable for making quality concrete (Photo 9), although gravel is usually preferred for exposed aggregate.

The use of recycled concrete, crushed to proper-size concrete aggregate, has also demonstrated successful performance..

What is fineness of cement?

The fineness of cement is property of cement which indicate the particle size of cement and specific surface area and thus indirectly effect heat of hydration. Importance/effect of fineness of cement; 1. Fineness of cement affects hydration rate hence the rate of strength gain.

Which type of the following mix will be produced if the fineness modulus of an aggregate is high?

A higher FM index indicates coarser aggregate that will produce a “harsh” mix, prone to segregation and difficult to place and finish properly. A low FM indicates finer aggregate that will require additional cement and increase water demand.

What is the size of fine aggregate?

– Fine aggregates are usually sand or crushed stone that are less than 9.55mm in diameter. Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete. Larger aggregate diameters reduce the quantity of cement and water needed.

What does ASTM stand for?

the American Society for Testing and MaterialsThe letters “ASTM” used to stand for the American Society for Testing and Materials.

What modulus means?

The modulo (or “modulus” or “mod”) is the remainder after dividing one number by another. Example: 100 mod 9 equals 1. Because 100/9 = 11 with a remainder of 1.

How is Young’s modulus calculated?

The stress of the medium relates to the ratio of the applied force with respect to the cross-sectional area. … Young’s modulus equation is E = tensile stress/tensile strain = (FL) / (A * change in L), where F is the applied force, L is the initial length, A is the square area, and E is Young’s modulus in Pascals (Pa).

Which zone of sand is good for concrete as per IS code?

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.

What is ASTM 33?

Frequently referred to as washed concrete sand or manufactured sand, ASTM C33 refers to a type of sand that meets specific ASTM guidelines for concrete aggregates and/or the items that are added into the concrete in order to prepare it for use. … C33 sand also specifies the grading of the aggregate materials.

What do you mean by workability?

Explanation: The workability is defined as the ease with which a freshly mixed concrete can be properly compacted and also that it can be transported, placed, and finished.

What are the different sizes of stone?

Crushed Stone GradesCrushed stone #5 – Sizes are from 1″ down to fine particles. … Crushed stone #67 – Sizes from 3/4″ down to fine particles. … Crushed stone #1 – Sizes are from 2″ to 4″. … Crushed stone #8 – Sizes from 3/8″ to 1/2″. … Crushed stone #3 -Sizes from 1/2″ to 2″. … Crushed stone #10 (also called stone dust) – Screenings or dust.More items…•

What is bulking of sand?

Bulking of fine aggregate or sand is the phenomenon of increase in sand volume due to the increase of moisture content.

What is the size of cement?

What is the average particle size of cement? Explanation: Approximately 95% of cement particles are smaller than 45 microns and the average particle size is 15 microns.

What is modulus strength?

Tensile Modulus is defined as the. “ratio of stress (force per unit area) along an axis to strain (ratio of deformation over initial length) along that axis” It can be used to predict the elongation or compression of an object as long as the stress is less than the yield strength of the material.

What are the 4 main types of aggregates?

The Different Types Of Aggregate. The categories of aggregates include gravel, sand, recycled concrete, slag, topsoil, ballast, Type 1 MOT, and geosynthetic aggregates (synthetic products commonly used in civil engineering projects used to stabilise terrain).

Is Young’s modulus yield strength?

Traditionally, Young’s modulus is used up to the material’s yield stress. (Yield stress is the stress at which a material begins to deform plastically.

What is the meaning of fineness?

(ˈfaɪnnɪs ) 1. the state or quality of being fine. 2. a measurement of the purity of precious metal, expressed as the number of parts per thousand that is precious metal.

How do you test the fineness of cement?

Fineness of Cement is measured by sieving cement on standard sieve. The proportion of cement of which the cement particle sizes are greater than the 90 micron is determined.

Is cement a 4031 test?

distilled water shall be used in preparing the cubes. combined mass of cement and sand, whether P is the per- centage of water required to produce a paste ofstandard consistency determined as described in IS: 4031 ( Part 4 ) – 1988* 6.1.

What is fineness modulus used for?

The significance of fineness modulus (FM) is in specifying the proportions of fine and coarse aggregates when designing concrete mixes. The higher the value of FM, the coarser the aggregate. Generally, a lower FM results in more paste, making the concrete easier to finish.

What is meant by fineness modulus 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.