Figure 5 Typical composite models for predicting Young's modulus (a) Parallel model (b) Series model (c) Counto model and (d) Hashin model Typical composite models for predicting Young's modulus (a) Parallel model (b) Series model (c) Counto model and (d) Hashin model Get price

initially tensile creep strains elastic Young's modulus purely compressive creep strains sample age [h] [kN] static = dynamic modulus no dynamic stiffening [-] age of material [h] [GPa] data from 2 samples data from 2 samples Power-law exponent creep parameters evolve The age- and w/c-dependent creep behavior of cement paste results from Get price

However most often the tensile modulus is considered equal to the compressive modulus and is estimated empirically based on the measurements of compressive strength To evaluate the validity of this approach the tensile Young's moduli of 6 concrete Get price

Early age concrete simulations can be used to minimize the risk of cracking by optimizing the materials and construction techniques for the local environmental conditions These simulations are rarely performed however because of the great expense and time needed to quantify the early age concrete mechanical properties (modulus tensile Get price

An analytical method for prediction of the elastic modulus of concrete Zheng J Li C and Zhou X 2006 'An analytical method for prediction of the elastic modulus of concrete' Magazine of Concrete Research vol 58 no 10 pp 665-673 Get price

This paper provides an overview of the early-age properties of concrete from a materials science and concrete engineering perspective The aim of this manuscript is to contribute to gap analysis and to improve the strategy for evaluation methods of the risk of cracking in mass concrete Get price

30/10/2018Shen et al found that when concrete curing age was less than 7 days the Young's modulus of the concrete was about 1 0 to 1 3 times that of the elastic modulus of the concrete Shariq et al [12] found that for normal concrete and the concrete with 40% of slag their elastic moduli were increased by 16% and 22% respectively from the concrete with ages of 28 days to 180 days Get price

overall view of concrete quality is reﬂected by the concrete strength [1] In addition compressive strength is a structural engineering performance measure employed for designing concrete structures [2] In practice design engineers use differ-ent speciﬁed concrete strengths to Get price

The understanding of stress relaxation and tensile creep behavior is extremely important in accurate stress analysis and crack prediction of early-age concrete The free shrinkage deformations of concrete with different strength grade were examined The early-age tensile elastic modulus of concrete was investigated through temperature-stress testing machine Get price

Incorporation of both distance from root tip and root diameter and root type increased the reliability of predictions for root biomechanical properties from 47 to 57 % for tensile strength and 35 to 62 % for Young's modulus Conclusions The age effect may partly explain some scatter in both Young's modulus and tensile strength to diameter Get price

ties of arches roof and bridge trusses In the meantime shear strength is essential in reinforced concrete beams to control the diagonal cracking under flexure However so far there is no direct practical standardized method to evaluate the tensile and shear strength of concrete despite the different tests suggested by several researchers 1 1 Get price

ACI MATERIALS JOURNAL TECHNICAL PAPER Title no 98-M 11 Proposal for Standard Test of Modulus of Rupture of Concrete with Its Size Dependence by Zdenek P Bazant and Drahomfr Novak Recently accumulated test data on the modulus of rupture as well as Get price

Cracking is investigated both at early ages during hydration and at mature age when the final properties of the concrete are reached One of the most important material characteristics of the concrete at early ages the Young's modulus is determined by means of a dynamic method called the resonance frequency method Get price

Estimation of ultimate modulus of elasticity and Poisson ratio of normal concrete K K Sideris * P Manita the paste changes with age the values of E P and m P in concrete increase with an increase in compressive ultimate modulus of elasticity and Poisson ratio of concrete Get price

overall view of concrete quality is reﬂected by the concrete strength [1] In addition compressive strength is a structural engineering performance measure employed for designing concrete structures [2] In practice design engineers use differ-ent speciﬁed concrete strengths to Get price

Modulus of Elasticity of Concrete 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 45f' c As concrete is a heterogeneous material The strength of concrete is dependent on the relative proportion and modulus of Get price

reinforcement a net tensile stress develops Results show that the hydration modulus is viscoelastic approximately 8-9000 000 MPa and is a constant material property Total stress analysis can now be separated into two components an elastic stress based on the Young's modulus (typically in the rangeGet price

Estimation of ultimate modulus of elasticity and Poisson ratio of normal concrete K K Sideris * P Manita the paste changes with age the values of E P and m P in concrete increase with an increase in compressive ultimate modulus of elasticity and Poisson ratio of concrete Get price

of Concrete Loaded at an Early Age Seung-Gyu Kim Yeong-Seong Park and Yong-Hak Lee * is presented to account for the development of the elastic modulus at an early age This is achieved terms of mechanical properties such as compressive and tensile strength elastic modulus creep and shrinkage Several major properties at the early Get price

Cracking is investigated both at early ages during hydration and at mature age when the final properties of the concrete are reached One of the most important material characteristics of the concrete at early ages the Young's modulus is determined by means of a dynamic method called the resonance frequency method Get price

2 0 REINFORCED CONCRETE SLABS UNDER LOADS The basis for the analysis of reinforced concrete structures has been the theory of elasticity in many countries It was developed and formed on the basis of Hooke's law [6] This method with respect to the perfection it reaches is known as classical method The classical methodGet price

Eurocode 2 Design of concrete structures EN1992-1-1 Symposium Eurocodes Backgrounds and Applications Brussels 18-20 February 2008 • Design tensile strength f ctd f where t = age of concrete at time considered t s= age at beginning of drying shrinkage (mostly end of curing) ca = t t ε β Get price

Modulus Of Elasticity Of Concrete - Civil Engineering thermal stress analysis of massive concrete at early age Fortunately the values of k n α and β given by JCI codes 2008 [3] were confirmed to be suitable for Early age strength prediction in concrete is very useful in reducing construction cost and ensuring safety Get price

Bissonnette et al [8] researched the tensile creep of concrete at early age and presented some measurements of the tensile Young's modulus at the age of 7 and 28 days In an earlier work [ 9 ] the authors investigated the tensile Young's moduli by using a direct tension test and presented a composite model derived from the Hirsh model [ 10 ] to predict the tensile modulus Get price

See also Nano- and mesoscale modeling of cement matrix Nano- and mesoscale modeling of cement matrix Preparation and Mechanical Properties of Graphene Oxide Cement Nanocomposites Preparation and Mechanical Properties of Graphene Oxide Cement Nanocomposites A Prediction Method of Tensile Young's Modulus of Concrete at Early Age A Prediction Method of Tensile Young's Modulus of Concrete Get price

The current paper attempts to develop an analytical method for prediction of the elastic modulus of concrete A three-phase composite circle model for the concrete matrix is proposed to represent the heterogeneous nature of concrete Based on the classic theory of elasticity a closed-form solution to the plane strain bulk modulus of concrete Get price

The understanding of stress relaxation and tensile creep behavior is extremely important in accurate stress analysis and crack prediction of early-age concrete The free shrinkage deformations of concrete with different strength grade were examined The early-age tensile elastic modulus of concrete was investigated through temperature-stress testing machine Get price

properties of concrete for use in eurocode 2 135 Arturs Llama Download with Google Download with Facebook or download with email properties of concrete for use in eurocode 2 135 Download properties of concrete for use in eurocode 2 135 Get price

Table 5 Conditions for simulation of tensile Young's modulus Composite model See Figure 6 Elements 80 80 Air content 4 5% Tensile Young's modulus of mortar see Solid volume content of coarse aggregate 60% Tensile Young's modulus of concrete Average of 10 simulations Get price

Three concrete mixes using Ordinary Portland Cement (OPC) were tested The three concrete mixes were cast and each underwent the ring tests up to cracking Mechanical properties of concrete at the age of 1 3 7 14 and 28 days were tested to find the compressive strength tensile strength and Young's Modulus of concrete Get price

Modulus of Elasticity of Concrete 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 45f' c As concrete is a heterogeneous material The strength of concrete is dependent on the relative proportion and modulus of Get price

However most often the tensile modulus is considered equal to the compressive modulus and is estimated empirically based on the measurements of compressive strength To evaluate the validity of this approach the tensile Young's moduli of 6 concrete Get price

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