scholarly journals Modulus elasticity of the graded concrete, a preliminary research

2018 ◽  
Vol 195 ◽  
pp. 01005 ◽  
Author(s):  
M. Mirza Abdillah Pratama ◽  
B. Sri Umniati ◽  
Bunga Arumsari Mutiara Wulandari ◽  
Ay Lie Han ◽  
Buntara Sthenly Gan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Concrete Strength ◽  
Test Results ◽  
Structural Element ◽  
Concrete Material ◽  
Static Modulus ◽  
Preliminary Research ◽  
Static Modulus Of Elasticity

The elastic modulus of materials plays a role in determining the stiffness of a structural element and its level of serviceability. Previous research indicates that the concrete modulus of elasticity could be improved by combining 2 (two) concrete mixes using a gradual compacting method. In this study, the effect of different concrete strength combinations to the resulting modulus of elasticity is examined. Three types of concrete mixes with a strength of 30 MPa, 40 MPa and 50 MPa are prepared. The graded concrete is moulded in cylindrical concrete casts (150 mm x 300 mm) with the following casting configurations: 30-40 MPa, 30-50 MPa, and 40-50 MPa. The static modulus of elasticity test is performed at an age of 28 days using compressometers in accordance with ASTM C469. The test results show that the modulus of elasticity of the graded concrete is proportionally influenced by the stiffness of the higher and the lower concrete material. Additionally, the resulting compressive strength of the graded concrete is determined by the lower concrete strength.

Repeatability and Reproducibility of the Static Elastic Modulus of Concrete Measurement

2018 ◽  
Vol 272 ◽  
pp. 214-219
Author(s):  
Petr Misák ◽  
Tomáš Vymazal ◽  
Dalibor Kocáb ◽  
Barbara Kucharczyková
Keyword(s):  
Elastic Modulus ◽  
Statistical Methods ◽  
Modulus Of Elasticity ◽  
Interlaboratory Comparison ◽  
Hardened Concrete ◽  
Test Results ◽  
Static Modulus ◽  
Repeatability And Reproducibility ◽  
Expected Values ◽  
Static Modulus Of Elasticity

In recent years, the static modulus of elasticity is one of the most discussed property of hardened concrete. The aim of this article is to show results of 6 performed experiments focused on test results precision. The measurements were made according to the standards ISO 6784 and ISO 1920-10. More than 20 participants (laboratories) from Europe took part in these experiments. Test results were compared using the statistical methods for interlaboratory comparison. Repeatability and reproducibility, which provide more detailed information about range of expected values of elastic modulus, are the most discussed characteristics in the article.

Experimental Assessment of the Influence of Multiple Cyclic Loading on Selected Properties of Lightweight Concrete

2019 ◽  
Vol 292 ◽  
pp. 45-49
Author(s):  
Petr Misák ◽  
Dalibor Kocáb ◽  
Martin Alexa ◽  
Barbara Kucharczyková ◽  
Petr Daněk ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Cyclic Loading ◽  
Modulus Of Elasticity ◽  
Test Specimen ◽  
Lightweight Concrete ◽  
Test Results ◽  
Static Modulus ◽  
Before And After ◽  
The Difference ◽  
Static Modulus Of Elasticity

The paper deals with results of the experiment when ordinary and lightweight concrete was subjected to cyclic loading. Each test specimen was loaded with the force equivalent to one third of the expected compressive strength value similarly to the static modulus of elasticity test with the difference that the total number of loading cycles was nearly 4500. Dynamic modulus of elasticity and compressive strength was measured before and after cyclic loading. The result of this experiment is statistical analysis of the test results and assessment of the influence of multiple cyclic loading.

Evaluation of the Modulus of Elasticity of Different Types of Concrete Compared with Eurocode 2

2016 ◽  
Vol 677 ◽  
pp. 181-185
Author(s):  
Klára Křížová ◽  
Rudolf Hela
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Strength Class ◽  
Raw Materials ◽  
Concrete Strength ◽  
Experimental Part ◽  
Static Modulus ◽  
Eurocode 2 ◽  
Different Types ◽  
Static Modulus Of Elasticity

The comparison of really measured compressive strength static modulus of elasticity with table values stated in Eurocode 2 is essential part of the paper. Since the standard draws from modulus of elasticity - concrete strength class, the set compressive strengths will be classified in concrete particular classes. Experimental part was based on several concrete design compositions differing in particular input raw-materials. Monitored values were set with concretes in different ages with final value 180 days. The experiment tries to demonstrate the impossibility of static modulus of elasticity derivation from table values which do not match the present-date produced concretes.

Experimental Determination of how the Static Modulus of Elasticity is Influenced by the Value of the Upper Loading Stress

2018 ◽  
Vol 272 ◽  
pp. 64-69
Author(s):  
Dalibor Kocáb ◽  
Petr Misák ◽  
Petr Daněk ◽  
Barbara Kucharczyková ◽  
Romana Halamová
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Strong Influence ◽  
Testing Methods ◽  
Static Modulus ◽  
Number Of Factors ◽  
Static Modulus Of Elasticity ◽  
The Impact

There is a large number of factors that have a strong influence on the elastic modulus of concrete. These are technological influences as well as issues connected with the testing methods for its determination, one of which is the choice of the upper loading stress of cyclic loading during testing the static modulus of elasticity of concrete in compression. The upper loading stress should be equal to 1/3 of the specimen’s compressive strength, however, its choice is often made incorrectly. This paper describes an experiment focused on discovering the impact that deviating from the 1/3 upper loading stress has on the measured value of the static modulus of elasticity.

scholarly journals Influence of Hybrid Fibers on Toughness Behavior of High Strength Flowing Concrete

2011 ◽  
Vol 57 (3) ◽  
pp. 249-260 ◽  
Author(s):  
Eethar Thanon Dawood ◽  
Mahyuddin Ramli
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Hybrid Composite ◽  
High Strength ◽  
Steel Fibers ◽  
Hybrid Fibers ◽  
Static Modulus ◽  
Static Modulus Of Elasticity ◽  
Strength And Toughness

Abstract This study investigates the use of steel fibers and hybrid composite with a total fibers content of 2% on the high strength flowing concrete and determines the density, compressive strength, static modulus of elasticity, flexural strength and toughness indices for the mixes. The results show that the inclusion of more than 0.5% of palm fibers in hybrid fibers mixes reduces the compressive strength. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fibers with palm fibers can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fibers (1.5 steel fibers + 0.5% palm fibers) in specimens increases significantly the toughness indices and thus the use of hybrid fibers combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances

scholarly journals Effect of Cement Type on the Mechanical Behavior and Permeability of Concrete Subjected to High Temperatures

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3021 ◽  
Author(s):  
Izabela Hager ◽  
Tomasz Tracz ◽  
Marta Choińska ◽  
Katarzyna Mróz
Keyword(s):  
High Temperature ◽  
Modulus Of Elasticity ◽  
Experimental Investigations ◽  
Test Results ◽  
Cement Type ◽  
High Temperature Exposure ◽  
Static Modulus ◽  
Granulated Blast Furnace Slag ◽  
Temperature Exposure ◽  
Static Modulus Of Elasticity

The paper presents experimental investigations concerning the influence of the cement type (CEMI 42.5 R Portland cement and CEMIII/A 42.5 N slag cement—with 53% granulated blast furnace slag) on the mechanical and transport properties of heated concretes. The evolution of properties due to high temperature exposure occurring during a fire was investigated. High temperature exposure produces changes in the transport and mechanical properties of concrete, but the effect of cement type has not been widely studied in the literature. In this paper, concretes were made with two cement types: CEMI and CEMIII, using basalt (B) and riverbed aggregates (RB). The compressive and tensile strength, as well as the static modulus of elasticity and Cembureau permeability, were tested after high temperature exposure to 200, 400, 600, 800, and 1000 °C. The evaluation of damage to the concrete and crack development due to high temperature effects was performed on the basis of the change in the static modulus of elasticity. The test results clearly demonstrated that permeability increases with damage, and it follows an exponential type formula for both types of cement.

Experimental Analysis of the Development of Compressive Strength, Modulus of Elasticity and Acoustic Emission Parameters of Alkali-Activated Composites

2018 ◽  
Vol 760 ◽  
pp. 266-271
Author(s):  
Dalibor Kocáb ◽  
Libor Topolář ◽  
Vlastimil Bílek Jr. ◽  
Barbara Kucharczyková ◽  
Michaela Hoduláková ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Modulus Of Elasticity ◽  
Stress Test ◽  
Ultrasonic Pulse ◽  
Static Modulus ◽  
Activated Slag ◽  
Static Modulus Of Elasticity ◽  
Non Destructive ◽  
Alkali Activated

This paper describes an experiment focused on monitoring the development of the modulus of elasticity and the compressive strength of composites that are based on alkali‑activated slag (AAS) during the first 28 days of ageing. The test specimens were tested at the age of 3 and 28 days using two non-destructive methods (ultrasonic pulse and resonance methods) to determine the value of the dynamic modulus of elasticity. Subsequently, the same specimens were used to determine the static modulus of elasticity using compressive stress test, during which the behaviour of the composite was monitored by equipment for recording the acoustic emission in the material. The result of the experiment is the evaluation of the behaviour of the AAS composite in regard to the development of its modulus of elasticity and compressive strength, as well as in regard to the acoustic emission method during loading.

Effect of High Proportion of Blended Cement in Concrete

2014 ◽  
Vol 897 ◽  
pp. 230-233 ◽  
Author(s):  
Klára Křížová ◽  
Rudolf Hela
Keyword(s):  
Modulus Of Elasticity ◽  
Strength Class ◽  
Concrete Strength ◽  
Blended Cement ◽  
Mix Design ◽  
Concrete Compressive Strength ◽  
Static Modulus ◽  
Static Modulus Of Elasticity ◽  
The Given

The paper is concerned with assessment of blended cement high proportion in mix design of concrete. A long term development of concrete compressive strength and static modulus of elasticity were monitored. The cement proportion reached even 450 kg per m3 of concrete. The high proportion of blended cement was used with aim to obtain declared modulus of elasticity values for the given concrete strength class according to EN 1992-1-1. And just the blended cement influence was positively verified in the long-term development of both monitored parameters.

Static Modulus of Elasticity of Concrete

2015 ◽  
Vol 824 ◽  
pp. 151-154
Author(s):  
Pavel Reiterman
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Hardened Concrete ◽  
Static Modulus ◽  
Concrete Mixtures ◽  
Compressive Strength Of Concrete ◽  
Static Modulus Of Elasticity

Present paper deals with the experimental investigation of static modulus of elasticity of hardened concrete and its relation to compressive strength of concrete. 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; modulus of elasticity was measured using prismatic specimens of dimensions 100x100x400 mm. Studied concrete mixtures present commonly used concrete of all established strength classes.

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