Three hundred 150 by 300 mm concrete cylinders were prepared from three different mixtures with target compressive. The formula is in excellent agreement with recognized empirical formulas for normal weight concrete. Experimental determination of the dynamic modulus of. Determination of modulus of elasticity of concrete testing of cube or cylinder in uniaxial compression test. Keywords high strength concrete, model, modulus of elasticity, silica fume. The relationships are basically empirical but an attempt is made to allow for density and for strengths in tension and in compression. Modulus of elasticity and strength linkedin slideshare. Relation between static and dynamic modulus of elasticity. The modulus of elasticity of concrete is a fundamental parameter in analysis and design of reinforced. Development of a new correlation to determine the static. As expected for a system not containing coarse aggregates, the static modulus of elasticity of foamed concrete is lower than that of normal concrete of equal density and is in the range of 8000 mpa for dry densities between 500 and 1500 kgm 3 british cement association, 1994. Equation 1 is the calculation for the modulus of elasticity of concrete e c according to the pre2005 aashto lrfd specifications eq. Strain dial gauge readinggauge length dll stress loadcross sectional area pa use compressometer and extensometer to measure.
Measure load and the corresponding deformation as the load is increased. Pdf modulus of elasticity of low strength concrete researchgate. Aerated concrete block acb, initial rate of absorption ira, dry density, compressive strength, modulus of elasticity, shear strength, flexural strength. Study on estimation of compressive strength of concrete in. To know the accurate value of elastic modulus of a. Influence of the type of measuring device in determining.
The elastisitymodulus or emodulus is a property of a material like concrete or steel whichs tells how much tension is needed to make it a little bit longer or shorter when you pull at 2 ends of a steal beam itll be a bit longer then when you press it together. The shape of stressstrain curve affects the static modulus of elasticity of concrete e c, but not the dynamic modulus e d hence the ratio of e c and e d is not fixed. The dynamic modulus of elasticity can be determined from equation 3 for the longitudinal dynamic test method ldtm and from equation 4 for the ultrasonic pulse method upm. Taking into account the increasing use of highstrength concrete as a structural material in colombia, this paper shows the results of research carried out to investigate the effect of different types of coarse aggregate on the static elastic modulus, the compressive strength, the concrete density, and the pulse velocity. It is defined as ratio of normal stress to longitudinal strain within th. Present paper deals with the experimental investigation of static modulus of elasticity of hardened concrete and its relation to compressive strength of concrete. Jan 20, 2018 you could do an moe test, such as as 1012. Static and dynamic elastic moduli of calcare massiccio mudstonelimestone, the typical seismogenic rock in the italian apennines, are measured using a standard uniaxial static compression test, a dual cantilever forced oscillation test and ultrasonic measurement of elastic wave velocities. Linger, associate professor of civil engineering, university of arizona this paper presents the results of a preliminary investigation of the effect of stress intensity on the modulus of elasticity of concrete. The dynamic modulus of elasticity can be determined from equation 3 for the longitudinal dynamic test method ldtm and from equation 4 for the. Normal weight concrete density 2400 kgm3 for computing loads. For granites and limestone the modulus of elasticity in compression is in the range 2,000,000 7,000,000 psi. Modulus of elasticity, ec mpa modulus of rupture, fr mpa class c 28 25 400 3. Relationships between the static and the dynamic moduli of elasticity are presented for a range of cement stabilised materials and discussed in relation to published data for materials of this type and for concrete.
The strength of concrete is dependent on the relative proportion and modulus of elasticity of the aggregate. The behavior of these parameters is similar to that found previously in the modulus of elasticity density. Static and dynamic elastic modulus of concrete as affected by. The youngs modulus observed is compared with the value used by aci318 aci. The elastic modulus of concrete is an important parameter in reinforced. The strength and deformability of lwac seems to be little affected by the. Youngs modulus of concrete samples of different compositions have been tested by static and. Differences between static and dynamic elastic moduli of a. In addition the entire static modulus venus strength relationship for each concrete can be predicted from early age up to 3 days measurements of dynamic modulus and compressive strength. Evaluation of static and dynamic residual mechanical.
Relation between static and dynamic modulus of elasticity of wood. Pauw, static modulus of elasticity of concrete as affected by density, aci journal proceedings, vol. Astm c 469 static modulus of elasticity and poissons ratio of concrete in. The porous concretes using cement mortar as binder are prepared with the percentage of target voids of 10, 15, 20, 25 and 30%, watercement ratios of 22. Elastic modulus of concrete is tested by using 150 mm x 300 mm cylinder specimens in accordance with. To assess the dynamic modulus of elasticity in the interior where the effect of drying is minimal, the density of the core specimens that were not affected by drying an age of 3 days for the slab specimen and an age of 7 days for the wall specimen and the ultrasonic velocity measured using the proposed method were used for calculating the. There are a few normalised methods of assessing the elastic properties of material using the vibration. Static and dynamic modulus of elasticity of structural lightweight and. Assessment of elastic modulus of concrete and its influence. Elastic modulus and compressive strength for masonry samples test bricks mortar elastic modulus nmm. The increase in amount of plastic waste decreases the density of concrete which leads to decrease in the mechanical and to improvement in thermal properties. Pdf estimation of the static modulus of elasticity of concrete using.
In turkey, many existing reinforced concrete buildings are in urgent need of seismic retrofitting. Pdf modulus of elasticity of low strength concrete. Determination of compressive strength of repair mortar bs 1881119. International journal on recent and innovation trends in. What are the factors affecting young modulus of elasticity. This calculation evaluates the applicability of the elastic modulus equation provided.
Evaluating the dynamic elastic modulus of concrete using. Further it was found that for the concretes investigated the static modulus can be predicted from the dynamic modulus using the resonant frequency technique. The dynamic modulus is usually significantly higher than the static moduli as originally noted by zisman 1933 and idle 1936. Effect of sedimentary and metamorphic aggregate on static modulus of elasticity of highstrength concrete. The objectives of this study are to investigate the relationship between static and dynamic elastic moduli determined using shearwave velocity measurements and to demonstrate the practical potential of the shearwave velocity method for in situ dynamic modulus evaluation. Static and dynamic elastic modulus of concrete as affected by mix composition and compressive strength authors. M2, showed the lowest elastic modulus and compressive strength compared to the other masonry samples.
Most design standards and studies propose empirical relations relying on compressive strength and concrete density to compute the modulus of elasticity of normalweight concrete 42. Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete, but using of recycled aggregate has a negative impact of concrete characteristic. Youngs modulus can be either calculated from the sonic and density logs dynamic youngs modulus, or measured directly in the laboratory static youngs modulus. The modulus of elasticity can be defined as a relation between the applied stress and the measured strain below yield stress.
However, because the codes of practice do not standardize the internal moisture content of the concrete and disregard the use of recycled aggregates when proposing equations for the estimation of the modulus of elasticity, discrepancies between the values measured and. Stressstrain diagrams are shown which were constructed for static. Jan 22, 2017 elastic modulus of concrete is tested by using 150 mm x 300 mm cylinder specimens in accordance with. How to estimate the modulus of the elasticity of the. The elastic modulus of concrete is an important parameter in reinforced concrete design and analysis. Aci committee 469, standard test method for static modulus of elasticity and poissons ratio of concrete in compression, american concrete institute, farmington hills, mich, usa, 2014. Elastic constants are relevant parameters whenever stresses and strains are considered. Static modulus of elasticity of concrete measured by the ultrasonic method lately, a huge number of accidents caused by problems found in the durability of concrete structures due to inappropriate project design, lack of control of quality during the project \s execution, inadequate maintenance practices and an aggressive environment has been. The static and the dynamic modulus of elasticity of. Jan 15, 20 the modulus of elasticity of concrete increases with increase in the modulus of aggregate used in its manufacture. Particularly, emodulus and shape of aggregate and cement paste. Modulus of elasticity for concrete determined from an experimental stressstrain relation curve, as described above, is generally termed as static modulus of elasticity ec whereas the modulus of elasticity determined through the longitudinal vibration test is termed as dynamic modulus of elasticity ed. The influence of concrete composition on youngs modulus core.
Static modulus of elasticity probability density functions. Relationships between the static and the dynamic moduli of. Structure concrete international journal of civil engineering. The modulus of the elasticity is the ratio of stress to corresponding strain below the proportional limit. The modulus of elasticity youngs modulus e is a material property, that describes its stiffness and is therefore one of the most important properties of solid materials. Effect of stress on the dynamic modulus of concrete. When a stress wave of velocity v is induced in a bar of density. Abstract the elastic modulus of concrete is an important parameter in reinforced concrete design and analysis. Effect of stress on the dynamic modulus of concrete d.
The value of modulus of elasticity of wet specimen is found higher from 3 to 4 gpa 3. Static and dynamic elastic modulus of concrete as affected. An investigation was carried out to study strength, modulus of elasticity and shrinkage of concrete containing palm oil fuel ash pofa. The value obtained by ndt cannot match exactly with the static modulus of elasticity but have certain relationship with it. Pdf modulus of elasticity of low strength concrete alper.
Lflong 1 moestr is the modulus of elasticity determined by this method. Cm is very difficult to predict because the properties of cm is affected by the. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. A better understanding of the relationship between density, strength and. To do this, concrete mixes were cast using three different.
Fip manual of lightweight aggregate concrete, 2nd edition. Though, you would probably be best to find the equivalent in your national code. Modulus of elasticity of concrete the modulus of elasticity of concrete e c adopted in modified form by the aci code is given by with normalweight, normal density concrete these two relations can be simplified to where e c modulus of elasticity of concrete, lbin 2 mpa. In the same way as the static modulus of elasticity, the probability density functions for the pulse velocity and concrete unit weight are shown in figs. The elastic behavior of the concrete is estimated from its strength or determined by static or dynamic tests. Studied concrete mixtures present commonly used concrete of all established. Astm c 469 static modulus of elasticity and poissons ratio of concrete in compression. In this study the static modulus for a large variety of aggregates and concrete strengths was analyzed and an empirical formula was derived which is applicable to both lightweight and normal weight structural concretes. Static modulus of elasticity of concrete as affected by density. Modulus of elasticity of concrete can be defined as the slope of the line drawn from stress of zero to a compressive stress of 0. While there are many factors for high seismic vulnerability of existing buildings, poor quality of concrete is a major and widespread problem for. The relationship between the compressive strength, static modulus of elasticity and dynamic modulus of elasticity of porous concretes is discussed.
Experimental studies were conducted on the static youngs modulus of normal. The relationship between the modulus of elasticity and strength is not much affected by the temperature upto 230c as both these properties vary with temperature in the same way. Pdf in turkey, many existing reinforced concrete buildings are in urgent need of seismic. The dynamic modulus is usually significantly higher than the static moduli as.
Modulus of elasticity of concrete civil engineering. Reasonable correlations are found between the elastic modulus and the compressive strength or concrete density. The average measured static modulus of elasticity are found less than the predicted static modulus of elasticity and splitting tensile strength aci 3182008 and aci 2r2003. Method for determination of compressive strength using. Validity and reliability of estimated modulus of elasticity. These 3 methods cover a wide range in characteristic time to be defined later from 1 ms to 600 s. Pdf effect of sedimentary and metamorphic aggregate on. In this study the static modulus for a large variety of aggregates and concrete strengths was analyzed and an empirical formula was.
Effect of cylinder size on the modulus of elasticity and. Determination of modulus of elasticity of concrete from. The porous concretes using cement mortar as binder are prepared with the percentage of target voids of 10, 15, 20. The ratio between static and dynamic modulus of elasticity in normal and high strength concrete abstract there is a simple linear relationship between the static and dynamic elastic module, this lead to hope that using dynamic elastic modulus may remove the problems in measuring the static elastic modulus of concrete. For this reason, the dynamic modulus of elasticity is approximately equal to the tangent modulus at the origin of the stressstrain curve determined in the static test, and is therefore larger than the static secant modulus. Creep and shrinkage of concrete are also affected by the modulus of elasticity of the aggregate112099 author. Method for determination of static modulus of elasticity in compression status. Standard test method for static modulus of elasticity and. For an existing structure static modulus of elasticity of concrete cannot be determined but dynamic modulus of elasticity can be determined by using non destructive testing ndt method.
The present aci approach for youngs modulus is based on normal strength concrete. Modulus of elasticity approximations from aci 318 building code the modulus of elasticity of concrete is a function of the modulus of each constituent cementitious matrix, lightweight and normal density aggregates and their relative proportions in the mixture. An empirical equation for youngs modulus of normal. Effect of moisture content on static compressive elasticity. Modulus of elasticity of concrete concrete technology. Static modulus of elasticity of concrete scientific. Based on the number of measurement was derived expression of dependence of modulus of elasticity on compressive strength of concrete which was determined using cubic specimens. Elasticity modulus, shrinkage, and creep of highstrength. E t 2 this qualitative observation can be attributed of tercelj et. Static modulus of elasticity of concrete as affected by. Static modulus of elasticity of concrete measured by the.
438 1213 639 621 1395 369 36 19 1429 109 659 470 604 1002 1378 1517 209 280 1068 1156 1530 760 753 893 1094 250 629 980 1118 318 786 1014 521