The aggregate modulus of a similar specimen is determined from a unidirectional deformational testing configuration, i. Currently, only the use of coarse aggregate derived from construction or demolition waste is recommended for use in new concrete construction. Desai from civil engineering department of jspms jayawantrao sawant polytechnic, hadapsar, pune28. Effect of coarse aggregate on elastic modulus and compressive. Gradation is determined by passing the material through a series of sieves stacked with progressively smaller openings from top to bottom and weighing the material retained on each sieve. Procedure of calcultion of fineness modulus of coarse aggregate products. Usually, sand, crushed stone, and crushed bricks are used as fine aggregate in concrete or pavement construction. Determining the resilient modulus of soils and aggregate minerals. The aggregate shall be sampled to meet the requirements prescribed.
Influence of aggregate characteristics on concrete. Further, fine aggregate failing to meet the fineness modulus requirement as above may be accepted, provided concrete made with similar fine aggregate from the same source has an acceptable performance record in similar concrete construction. Crdc10480 method of calculation of the fineness modulus. Determination of fineness modulus of fine aggregate particle size distribution of fine aggregates is the operation of dividing a sample of aggregate into various fractions each consisting of particles of the same size. Nov 21, 2016 function and importance of aggregate in concrete 1. Fineness modulus of aggregate is an index number which gives an idea about the finance of aggregate and is an approximate proportion of the average size of particle in the aggregate. So, a river sand natural sand will be in the range of2.
Two kinds of coarse aggregates stiff and soft and three kinds of fine aggregates fm3. Fineness modulus and particle size analysis of fine and. The fineness modulus fm is an empirical figure obtained by adding the total percentage of the sample of an aggregate retained on each of a specified series. Rounded aggregate, such as gravel, requires slightly lower values, while crushed aggregate requires slightly higher values. Textural characteristics of fine aggregate efficiency on. What is fineness modulus of sand fine aggregate and. From several trial mixes of scc it has been shown that a suitable mix for adequate compressive strength can be formulated with marginal aggregate of fine coarse aggregate ratio of 1. Grading, fineness modulus and plasticity index shall be tested to meet the requirements prescribed. A lightweight cementitious composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.
From several trial mixes of scc it has been shown that a suitable mix for adequate compressive strength can be formulated with marginal aggregate of finecoarse aggregate ratio of 1. The importance of fineness modulus concrete construction. Chapter 2 sieve analysis and fineness modulus sampling. Fineness modulus of coarse aggregates represents the average size of the particles in the coarse aggregate by an index number. This will help in filling the voids present between coarse aggregate and they mix with cementaneous materials and form a paste to coat aggregate particles and that affect the compactability of the mix.
This can create a relationship between grading and consistence and. Pdf optimization of gradation and fineness modulus of. Fineness modulus of fine aggregate sand and sieve analysis duration. Fineness modulus of finer aggregate is lower than fineness modulus of coarse aggregate. Specific gravity is the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Why fineness modulus of coarse aggregates is more than. Evaluate the effects of gradation, fineness modulus and mineral constituents of various natural sands on strength of hardened concrete. Standard test method for sieve analysis of fine and coarse aggregates from different sources. A catalog was developed with resilient modulus values for 16 aggregates from virginia. How does the fineness modulus of aggregate affect the.
It is calculated by performing sieve analysis with standard sieves. 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. The importance of fineness modulus download the pdf version of this article. In general, however, a smaller value indicates a finer aggregate. Significance and use a method of selecting mixture proportions. Fine aggregate content is usually 35% to 45% by mass or. For a sand to be suitable for concrete the fineness modulus has to be from 2 to 4.
Is this aggregate finer or coarser than the one shown in table 5. The results of testing will re ect the condition and characteristics of the aggregate from which the sample is obtained. The cumulative percentage retained on each sieve is added. In concrete works, sand is used as a fine aggregate. Fineness modulus article about fineness modulus by the free. The sieve analysis, commonly known as the gradation test, is a basic essential test for all. Finess modulus is just a value number indicating the fineness or coarseness of the aggregate. To assess the efficiency of fine crushed aggregate angularity as well as its percent on the concrete properties, fine crushed aggregates at fixed fmvalues were mixed with different percentage varying from 0% to 100% of the total content of fine aggregates were used instead of fine natural aggregates. It means the average aggregate size is in between 0.
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. A blend of fine aggregate 70% qibla bandi and 30% of chenab river sand having fineness modulus of 2. Sand from the local river cauvery was used as fine aggregate with the fineness modulus of 2. Fine aggregate gradation fine aggregate shall be natural sand and meet the gradation requirements of no.
The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. Coarse aggregate is used to describe particles larger than 4. Functions and importance of aggregate in concrete applications vinod kumar singh cofounder. With the exceptions of relating concrete modulus to aggregate modulus and concrete coefficient of thermal expansion cte to aggregate cte, weak correlations were generally obtained between a single aggregate characteristic and concrete performance properties. The results indicate that the slump and flowability for all fresh concrete in this study right. Physical properties of aggregates rowan university. Fineness modulus from engineerin 2011041037 at atma jaya catholic university of indonesia. Fine aggregate is derived from natural sand or crushed stone sand or crushed gravel with particle capable of passing a 5mm sieve by kong and.
Dec 01, 2014 aggregate is classified into two general sizes. Crdc10480 method of calculation of the fineness modulus of. Efficiency factor and modulus of elasticity of lightweight. Fineness modulus is an empirical factor obtained by adding the cumulative percentages of aggregate retained on each of the standard sieves ranging from 4. Effect of fineness of sand on the cost and properties of. Oct 03, 2018 fineness modulus is an indication grading of particle size. An example provided in the aci 211 standard states that, for a fine aggregate having a fineness modulus of 2. Astm d1073 16 standard specification for fine aggregate for. The effect of very fine aggregate on the water requirement and strength evolution of superplasticized concrete was studied. The larger the fineness modulus, the more coarse the aggregate. Fineness modulus how is fineness modulus abbreviated. The process of mixing, transporting, placing and compacting concrete using ordinary port land cement should not take more than.
Fine aggregate is the essential ingredient in concrete that consists of natural sand or crushed stone. To find the fineness modulus of fine aggregate we need sieve sizes of 4. Determination of fineness modulus of fine and coarse. Defined as the product of division of the the total weights retained on a set of designated sieves divided by the original weight of the sample. Development of a catalog of resilient modulus values for. An aggregate is said to be flaky, if its least dimension is less than. The resilient modulus values ranged from approximately 10,000 to 30,000 psi. Fineness modulus is generally used to get an idea of how coarse or fine 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.
To characterize the overall coarseness or fineness of an aggregate, a. Concrete elastic modulus for various aggregate types. This abstract is a brief summary of the referenced standard. Which indicates mean particle size in sand fine aggregate fm is obtained by adding cumulative percentage retainedpercentage. What is fineness modulus of sand fine aggregate and calculation. Physical properties of aggregates 10 fine aggregate angularity measured on 2. To avoid this ambiguity fineness modulus could be used as a yard stick to indicate the fineness of sand. Optimization of gradation and fineness modulus of naturally fine sands for improved performance as fine aggregate in concrete conference paper pdf available in procedia engineering 145 may.
What the supplier terms as fine sand may be really medium or even coarse sand. Typical values substance specific gravity density lbft3 water 1. More the value of fm more coarser the aggregate is. This specification covers fine aggregate for use in bituminous paving mixtures. The cumulative percentage retained on each sieve is added and subtracted by 100 gives the value of fineness modulus. It is used to determine degree of uniformity of the grading. This is natural sand from a good source free of impurities and contaminations that is capable of achieving the cohesiveness of the mix and desired strength. Fineness modulus of sand fine aggregate is an index number which represents the mean size of the particles in sand. What is fineness modulus of coarse aggregates and its calculation. The quality and fine aggregate density strongly influence the hardened properties of the concrete the concrete or mortar mixture can be made more durable, stronger and cheaper if you made the selection of fine aggregate on basis of grading zone, particle shape and surface. Fineness modulus of fine aggregate fine aggregate sand grading affects consistence and finishability. The sieve analysis is conducted to determine the particle size distribution in a sample of aggregate, which we call gradation.
Fine aggregate consists of natural sand, manufactured sand, or a combination. For aggregates used in pcc, another common gradation description for fine aggregate is the fineness modulus. The cumulative percentage retained on each sieve is added and subtracted by 100 gives the value of fine aggregate. Jan 21, 2018 this video contains about the fineness modulus in aggregate. Procedure of calcultion of fineness modulus of coarse aggregate. It is found out by sieve analysis test of standard size in the l. It means the average value of aggregate is in between the 2 nd sieve and 3 rd sieve. In relation to biomechanics, the aggregate modulus ha is a measurement of the stiffness of a material at equilibrium when fluid has ceased flowing through it. Therefore, fineness modulus of aggregate cumulative % retained 100 275100 2. The aggregate modulus of a similar specimen is determined from a unidirectional deformational testing. Excel sheet for sieve analysis of aggregate and to calculate fineness modulus. Then the particles distribution study given an idea as to weather the material well grade or not. The same value of fineness modulus may therefore be obtained from several different particle size distributions.
A typical fineness modulus for fine aggregate used in pcc is between 2. Determination of fineness modulus of fine aggregate. Excel sheet for sieve analysis of aggregate and to. Fineness modulus fm the fineness modulus fm is a factor obtained by adding the percentages of material in a sample of aggregate that is retained on each of the. The maximum aggregate size was 6 mm, fine aggregate content 015% of the total aggregate, binder opc and silica content 80800 kg m.
Calculate the fineness modulus for the aggregate below. Combined effect of fineness modulus and grading zones of. Before calculating fm, lab technicians perform a sieve analysis to determine the particle size distribution, or grading, of the aggregate sample. Resilient modulus development of aggregate base and subbase. The cumulative percentage retained on each sieve is added and subdivided by 100 gives the value of fine aggregate. Effect of specific gravity on aggregate varies the weight of. These classifications do not give any precise meaning. Fineness modulus is used to know the size of aggregate grains particles for various measurements used in civil engineering.
The fine aggregate was washed natural quartz sand with a fineness modulus of 2. Sieve analysis aggregate gradation sieve analysis is the distribution of particle sizes expressed as a percent of the total dry weight. Fineness modulus fineness modulus concrete technology. The fineness modulus fm is an empirical figure obtained by adding the total percentage of the sample of an aggregate retained on each of a specified series of sieves, and dividing the sum by 100. Revised application of fineness modulus in concrete proportioning. Develop an optimization technique to optimize the grain size distribution and fineness modulus of fine sands and to make them suitable for concreting works. Fineness modulus of coarse aggregates and its calculation. Determination of fineness modulus of sand to determine the fineness modulus, we need. It is an empirical number relating to the fineness of the aggregate. Fine aggregate is classified as coarse sand, medium sand and fine. Effect of very fine aggregate on concrete strength springerlink.
As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any sizereduction requirements including, procedure of calcultion of fineness modulus of coarse aggregate, quarry, aggregate, and different kinds of minerals. Excel sheet for sieve analysis of aggregate and to calculate fineness modulus 8. Pdf standard test method for sieve analysis of fine and. Calculate the fineness modulus for the following fine aggregate. Combined effect of fineness modulus and grading zones of fine. Fineness modulus of fine aggregate txdot designation. Fineness modulus fm is an empirical calculation used to support the optimisation of a concrete mix design. Optimization of gradation and fineness modulus of naturally. Jan, 2018 many a time, fine aggregates are designated as coarse sand, medium sand and fine sand. Abstract the effects of various fineness moduli fm of fine aggregate on the engineering properties of high. Susceptibility of jhelum river bed aggregate to alkali silica reaction and its potential as construction aggregate. When the fineness of combined aggregate is expressed in terms of fineness modulus instead of as gravelsand ratio, a single determination of opti mum fineness serves for all reasonable gradations of fine or coarse aggregates of a given type and maxi mum size. If not what corrective action as to be taken is decided upon.
223 501 1014 1076 405 1580 433 513 760 1151 196 383 831 176 732 558 1510 1098 472 951 1105 902 924 1444 1170 605 593 409 253 237 1377 404 112 1429 676