scholarly journals Influence of Microfibrillated Cellulose Additive on Strength, Elastic Modulus, Heat Release, and Shrinkage of Mortar and Concrete

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6933
Author(s):  
Yurii Barabanshchikov ◽  
Hien Pham ◽  
Kseniia Usanova
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Heat Release ◽  
Modulus Of Elasticity ◽  
Evaporation Rate ◽  
Microfibrillated Cellulose ◽  
Water Evaporation ◽  
Additive Content ◽  
Reference Specimens

This work aimed to study the effect of a microfibrillated cellulose additive on strength, elastic modulus, heat release, and shrinkage of mortar and concrete. The dosage of the additive varies from 0.4 to 4.5% by weight of the cement. The change in strength with an increase in the dosage of the additive occurred in a wave-like manner. The uneven character of the change in the results also took place in the determination of heat release and shrinkage. In general, heat release and shrinkage decreased at increasing additive dosage. The additive showed the greatest decrease in the heat release of concrete at a content of 2%. The heat release of concrete practically differed little from the exotherm of the standard at an additive content of 1 and 1.5%. The addition of microfibrillated cellulose additive in small (0.5%) and large (1.5%) amounts reduced shrinkage compared to the reference, and at an intermediate content (1%), the shrinkage was higher than in the reference specimens. In this case, the water evaporation rate from concrete increased with an increase in the additive. With an increase in the additive dosage, the modulus of elasticity decreases. Thus, the microfibrillated cellulose additive provides concrete with lower values of the modulus of elasticity, heat release, and shrinkage, and the additive is recommended for use in concretes with increased crack resistance during the hardening period. The recommended additive content is 0.5% by weight of cement. At the specified dosage, it is possible to provide the class of concrete in terms of compressive strength C35/45.

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.

Performance Deterioration of High Strength Concrete under Mixed Erosion and Freeze-Thaw Cycling

2010 ◽  
Vol 163-167 ◽  
pp. 1655-1660
Author(s):  
Jian Zhang ◽  
Bo Diao ◽  
Xiao Ning Zheng ◽  
Yan Dong Li
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Mass Loss ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
High Strength Concrete ◽  
High Strength ◽  
Freeze Thaw ◽  
Strength Concrete ◽  
Dynamic Modulus Of Elasticity

The mechanical properties of high strength concrete(HSC) were experimentally investigated under mixed erosion and freeze-thaw cycling according to ASTM C666(Procedure B), the erosion solution was mixed by weight of 3% sodium chloride and 5% sodium sulfate. The mass loss, relative dynamic modulus of elasticity, compressive strength, elastic modulus and other relative data were measured. The results showed that with the increasing number of freeze-thaw cycles, the surface scaled more seriously; the mass loss, compressive strength and elastic modulus continued to decrease; the relative dynamic modulus of elasticity increased slightly in the first 225 freeze-thaw cycles, then decreased in the following 75 cycles; the corresponding strain to peak stress decreased with the increase of freeze-thaw cycles. After 200 cycles, the rate of deterioration of concrete accelerated obviously.

Elastic Modulus Calculation of GRT Fiber-Rubberized Haydite Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 423-427
Author(s):  
Bing Hua Xia ◽  
Yuan Cai Liu ◽  
Qing Wen Zhang
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Test Data ◽  
Apparent Density ◽  
Modulus Of Elasticity ◽  
Compression Modulus ◽  
Regression Method ◽  
Orthogonal Test ◽  
Intensity Level ◽  
Static Compression

Experiment with intensity level for the LC30 ceramsite concrete as the research object, changing the content of cement, GRT fiber, rubber powder by the orthogonal test to configure GRT fiber—rubberized haydite concrete samples, maintenance samples 28d in standard conditions and respectively testing their modulus of elasticity、standard compressive strength and apparent density. Through the analysis of the test data, using regression method to establish the GRT fiber—rubberized haydite concrete static compression modulus of elasticity experiential formula and use new test data to compare the value of calculation. By comparing test values and calculated values proved availability of the regression formula.

scholarly journals Chemical, Physical, and Mechanical Properties of 95-Year-Old Concrete Built-In Arch Bridge

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 20
Author(s):  
Andrzej Ambroziak ◽  
Elżbieta Haustein ◽  
Maciej Niedostatkiewicz
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Modulus Of Elasticity ◽  
Ph Value ◽  
Water Soluble ◽  
Dry Density ◽  
Chloride Salt ◽  
Concrete Core ◽  
Arch Bridge

This research aimed to determine the durability and strength of an old concrete built-in arch bridge based on selected mechanical, physical, and chemical properties of the concrete. The bridge was erected in 1925 and is located in Jagodnik (northern Poland). Cylindrical specimens were taken from the side ribs connected to the top plate using a concrete core borehole diamond drill machine. The properties of the old concrete were compared with the present and previous standard requirements and guidelines. The laboratory testing program consisted of the following set of tests: measurements of the depth of carbonated zone and dry density, water absorption tests, determination of concrete compressive strength and frost resistance, determination of modulus of elasticity, measurement of the pH value, determination of water-soluble chloride salt and sulfate ion content, and X-ray diffraction analyses. Large variations in the cylindrical compressive strength (14.9 to 22.0 MPa), modulus of elasticity (17,900 to 26,483 MPa), density (2064 to 2231 kg/m3), and water absorption (3.88 to 6.58%) were observed. In addition to the experiments, a brief literature survey relating to old concrete properties was also conducted. This paper can provide scientists, engineers, and designers an experimental basis in the field of old concrete built-in bridge construction.

Experimental determination of elastic modulus of elasticity and Poisson’s coefficient of date palm tree fiber

2018 ◽  
Vol 16 (3) ◽  
pp. 357-367 ◽  
Author(s):  
Youcef Djebloun ◽  
Mabrouk Hecini ◽  
Tarek Djoudi ◽  
Belhi Guerira
Keyword(s):  
Elastic Modulus ◽  
Experimental Determination ◽  
Modulus Of Elasticity ◽  
Date Palm ◽  
Palm Tree

The Study of Mechanical Properties of Structural Lightweight Concrete

2010 ◽  
Vol 97-101 ◽  
pp. 1620-1623 ◽  
Author(s):  
Hong Zhi Cui ◽  
Feng Xing
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Bond Strength ◽  
Modulus Of Elasticity ◽  
Lightweight Concrete ◽  
Experimental Studies ◽  
Lightweight Aggregate ◽  
Experimental Results ◽  
The Relationship

Many investigations have been conducted on compressive strength of lightweight aggregate concretes (LWAC), but there are few experimental studies on the relationship between compressive strength, bond strength and elastic modulus of LWAC. In this paper, the specimens of twenty kinds of LWACs with different mix proportions were made. Properties of compressive strength, bond strength and modulus of elasticity of the LWACs were tested. Based on the testing resulting, equations for relationship between bond strength and compressive strength of the LWAC were established. For LWAC modulus of elasticity, the experimental results of this study can fit well with predicted equation of ACI 318

Observation of the Development of the Elastic Modulus and Strength in a Polymer-Cement Mortar Using the Acoustic Emission Method

2018 ◽  
Vol 272 ◽  
pp. 76-81
Author(s):  
Dalibor Kocáb ◽  
Libor Topolář ◽  
Barbara Kucharczyková ◽  
Petr Pőssl ◽  
Michaela Hoduláková
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Cement Mortar ◽  
Resonance Method ◽  
Ultrasonic Pulse Velocity ◽  
Pulse Velocity ◽  
Acoustic Emission Method ◽  
Emission Method

The paper describes an experiment focused on observing the development of the elastic modulus and compressive strength in a polymer-cement mortar during the first 28 days of aging. The specimens (aged 3 and 28 days) were tested for the static and dynamic modulus of elasticity using two methods – the ultrasonic pulse velocity test and the resonance method. During the test of the modulus of elasticity in compression the mortar’s behaviour was also examined by means of the acoustic emission method, which is based on the recording of mechanical pulses caused by dilation waves generated by microcracks that form during loading. The outcome of the experiment is an evaluation of the polymer-cement mortar’s behaviour in terms of the development of its elastic modulus and compressive strength as well as in terms of the material’s acoustic response during loading.

Determination of Elastic Modulus of Steel Wire Ropes for Computer Simulation

2014 ◽  
Vol 683 ◽  
pp. 22-27 ◽  
Author(s):  
Ján Boroška ◽  
Alena Pauliková ◽  
Vladimír Ivančo
Keyword(s):  
Computer Simulation ◽  
Elastic Modulus ◽  
Influencing Factors ◽  
Modulus Of Elasticity ◽  
Steel Wire ◽  
Wire Rope ◽  
Wire Ropes ◽  
Real Value ◽  
Construction Type

Modulus of elasticity of steel wire rope (elastic modulus) is a characteristic value, which is important not only for users of the steel rope, but also for designers of machines and machinery that are equipped with the steel wire rope. Values of the elastic modulus depends predominately on the elastic modulus of the material, which the rope is manufactured from as well as it depends on the various other factors. The most important influencing factors are as follows: rope construction, type of core, angle and way of wire stranding, angle and way of rope lay as well as kind of lubricant. The real value of the elastic modulus has also impact on prolongation of the steel wire rope and on intensity of its dynamical loading. The rope elastic modulus value can be determined by means of the various methods. There are analysed in this article such methods for determination of the rope elastic modulus, which can be applied for a computer simulation.

Sign in / Sign up

Export Citation Format

Share Document