how does the fineness modulus of aggregate affect the strength of concrete
The modulus of elasticity of concrete is denoted by Ec .Ec = 5000 sqrt fck as per IS standardswhere, fck- The compressive strength of concrete at 28 days in N/mm2 .
Per ASTM C78, the flexural strength of concrete (or the Modulus of Rupture) can be derived from the following equation:fc' = R2 / 100where:fc' = compressive strength (psi)R= Modulus of Rupture (psi)
the ability of beam or slab to resist failure in bending is called Flexural Strength of concrete.IIt is measured as modulus of rupture
section modulus is a measure of the strength of a beam. The more the section modulus the more is the strength.
According to the "Structural Engineer's Pocket Book" concrete commonly has a modulus of elasticity in the range of 17 - 30 GPa.The exact value of modulus of elasticity depends on the concrete's uniaxial compressive strength after a cure time of 28 days.These values are related using the following:Emc = 4700 x sqrt(UCS)Where:Emc = Elastic Modulus (MPa)UCS = Uniaxial Compressive Strength of Concrete after 28 days (MPa).Source:Cobb, F. (2009). Structural Engineer's Pocket Book, Second Edition. London, Butterworth-Heinemann.
how does the fineness modulus of aggregate affect the strength of concrete
how does the fineness modulus of aggregate affect the strength of concrete
Fineness modulus defines the size of the of the aggregates on concrete mix design. There area some limits on it though. If you have high modulus of fineness, the tendency of mixture is to have less pores as possible. The less pores you have, the good is your bonding between each elements. However,less pores means less breathing space for your concrete. This inhibits hydration. Once moisture doesnt escape from concrete, then the strength is very difficult to achieve. On the other hand, low modulus of fineness tend to have lower bonding between concrete elements. However, you can have better curing condition of you have optimum pores on your concrete. The strength can be achieve quickly.
Fineness modulus defines the size of the of the aggregates on concrete mix design. There area some limits on it though. If you have high modulus of fineness, the tendency of mixture is to have less pores as possible. The less pores you have, the good is your bonding between each elements. However,less pores means less breathing space for your concrete. This inhibits hydration. Once moisture doesnt escape from concrete, then the strength is very difficult to achieve. On the other hand, low modulus of fineness tend to have lower bonding between concrete elements. However, you can have better curing condition of you have optimum pores on your concrete. The strength can be achieve quickly.
Optimum for grading of aggregates and for surface texture of constructions.
Fineness Modulus is a measurement of the coarseness or fineness of a given aggregate.
Fineness Modulus is used to know the size of aggregate grains (Particles) for various measurements used in Civil Engineering. To characterize the overall coarseness or fineness of an aggregate, a concept of fineness modulus is developed. The Fineness Modulus is defined as Fineness Modulus = Σ(Cumulative Retained Percentage) 100 To calculate the fineness modulus, the sum of the cumulative percentages retained on a definitely specified set of sieves needs to be determined, and the result is then divided by 100. The sieves specified for the determination of fineness modulus are No. 100, No. 50, No. 30, No. 16, No. 8, No. 4, 3/8", 3/4", 1.5", 3", and 6". Mirza Usman http://www.facebook.com/Mirza.Usman.Blogger
The modulus of elasticity of concrete is denoted by Ec .Ec = 5000 sqrt fck as per IS standardswhere, fck- The compressive strength of concrete at 28 days in N/mm2 .
Fineness Modulus is used to know the size of aggregate grains (Particles) for various measurements used in Civil Engineering. To characterize the overall coarseness or fineness of an aggregate, a concept of fineness modulus is developed. The Fineness Modulus is defined as Fineness Modulus = Σ(Cumulative Retained Percentage) 100 To calculate the fineness modulus, the sum of the cumulative percentages retained on a definitely specified set of sieves needs to be determined, and the result is then divided by 100. The sieves specified for the determination of fineness modulus are No. 100, No. 50, No. 30, No. 16, No. 8, No. 4, 3/8", 3/4", 1.5", 3", and 6". Mirza Usman http://www.facebook.com/Mirza.Usman.Blogger
fm 25 to3.5
Finess Modulus is just a value (number) indicating the fineness or coarseness of the aggregate. So, a river sand (natural sand) will be in the range of2.5 or so to 2.7 and P-gravel (P-stone, Birds-eye) may be around 5.0 Natural sand is used to make concrete block. Natural sand is also used to make ready mixed structural concrete along with water, cement powder, and a coarse 3/8" to 3/4" aggregate like limestone or gravel. SO, there are ASTM standard that regulate the gradation of aggregates for concrete masonry and structural concrete (ASTM C33 is one of them). Mason sand is used in precast concrete to emulate a fine limestone-like texture. It is also used in mortar and grout.
Per ASTM C78, the flexural strength of concrete (or the Modulus of Rupture) can be derived from the following equation:fc' = R2 / 100where:fc' = compressive strength (psi)R= Modulus of Rupture (psi)