Concrete Strength and Deformation Property under Sea Water Erosion Environment

2012 ◽  
Vol 446-449 ◽  
pp. 2554-2559
Author(s):  
Jian Jun Cai ◽  
Feng Zhang ◽  
Wei Cui ◽  
Shou Shan Chen ◽  
Pu Lun Liu
Keyword(s):  
Deformation Property ◽  
Sea Water ◽  
Concrete Strength ◽  
Water Erosion ◽  
Strength And Deformation ◽  
Erosion Environment

Concrete Strength and Deformation Property under Sea Water Erosion Environment

2012 ◽  
Vol 446-449 ◽  
pp. 2554-2559 ◽  
Author(s):  
Jian Jun Cai ◽  
Feng Zhang ◽  
Wei Cui ◽  
Shou Shan Chen ◽  
Pu Lun Liu
Keyword(s):  
Large Scale ◽  
Failure Modes ◽  
Deformation Property ◽  
Sea Water ◽  
Dynamic Stiffness ◽  
Concrete Strength ◽  
Strain Curve ◽  
Water Erosion ◽  
Strength And Deformation ◽  
Erosion Environment

In order to effectively assess the concrete strength and deformation property under sea water erosion environment, concrete stress and strain curve was researched with the number of wet and dry cycle of 0 times, 10 times , 20 times, 30 times, 40 times, 50 times and 60 times based on the large-scale static and dynamic stiffness servo test set. The stress - strain curves of concrete was tested for the lateral pressure 10.8MPa, 14.4MPa, and 18.8MPa at different dry-wet cycles, The failure modes and superficial cracking characteristics of specimens are reported at different dry-wet cycles. Concrete elastic modulus and compressive strength were researched. Based on concrete mechanical theory , the classic Kufer-Gerstle strength criteria of concrete was used, a large number of test samples of multivariate data were nonlinear regressed, a biaxial concrete strength criterion was established taking into account the stress ratio and the number of dry-wet cycles.

Experimental Study on Mechanical Properties of Axially Loaded PVC Tubed Short Concrete Columns

2011 ◽  
Vol 99-100 ◽  
pp. 715-718 ◽  
Author(s):  
Jun Dong ◽  
De Ping Chen ◽  
Ju Mei Zhao ◽  
De Shan Shan ◽  
Xin Yue Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carrying Capacity ◽  
Loading Condition ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Load Carrying Capacity ◽  
Composite Columns ◽  
Load Carrying ◽  
Strength And Deformation ◽  
Axially Loaded

Twelve PVC tubed short concrete columns and four columns without PVC tube confined were tested under axial load to investigate mechanical properties of axially loaded PVC tubed short concrete columns . The principal influencing factors such as concrete strength, loading condition and ratio of height to diameter were studied. Test results indicated that strength and deformation performance of core concrete increased as a result of the confinement of PVC tube. The PVC tube confinement effect on concrete will decrease with an increase in strength of concrete. Load- carrying capacity and deformation of short composite columns with different loading condition made some difference. As the ratio of height to diameter increases, load- carrying capacity and plasticity of short composite columns decreased gradually.

scholarly journals POSSIBILITIES OF OPERATIONAL USE OF RELIABILITY THEORY METHODS/PATIKIMUMO TEORIJOS METODŲ PRAKTINIO TAIKYMO GALIMYBĖS

2001 ◽  
Vol 7 (5) ◽  
pp. 339-344
Author(s):  
Josifas Parasonis
Keyword(s):  
Statistical Data ◽  
Concrete Strength ◽  
Reliability Theory ◽  
Point Of View ◽  
Reliability Estimation ◽  
Geometrical Parameters ◽  
New Approach ◽  
Industrial Buildings ◽  
Deformation Properties ◽  
Strength And Deformation

The possibilities of using methods of a reliability theory are considered from the point of view of solving three problem groups. At first, collecting representative statistical data about loadings, design schemes, physical-mechanical characteristics of materials, geometrical parameters of structures, etc. Secondly, it is necessary to investigate reliability of the applied deterministic calculation and to evaluate statistically possible inaccuracies in calculations. At last, rated probabilities of the failure of structures. Use of reliability theory methods can be extended. It is necessary to accumulate statistical data about changes in time of strength and deformation properties of structural materials for reinforced concrete structures, variability of concrete strength in structures. It is necessary to accumulate statistics about actions and to solve the problem of values of factors. It has been marked that the studies of reliability of the design methods are realized for rather simple members subjected to bending and compression without consideration of materials properties in time. The expediency of experimental research on reliability of structures is discussed. Taking into account our experience of influence on reliability of frames of one-storey industrial buildings of the precision of geometrical parameters of mounting, it is expedient study reliability separately from design, mounting and maintenance stages. The new approach to a reliability estimation on the basis of ensuring functional reliablity of buildings is discussed. Thus the probability of failure should be equal to the magnitude of probability.

scholarly journals Microstructure Characteristics of Self Compacting Concrete using Sea Water

2018 ◽  
Author(s):  
erniati ◽  
muhammad wihardi tjaronge ◽  
Rudy Djamaluddin ◽  
Victor Sampebulu
Keyword(s):  
Compressive Strength ◽  
Sea Water ◽  
Concrete Strength ◽  
Infrastructure Development ◽  
Self Compacting Concrete ◽  
Microstructure Characteristics ◽  
Dense Microstructure ◽  
Water Curing ◽  
The Relationship ◽  
Mixing Water

In the cycle of life, the needs of freshwater more and more. Infrastructure development is increasing. On the concrete industry, several billion tones of water used in earth as mixing water, treatment water (curing) and cleaner water every year, where using of sea water is obstructed. For that, the using of sea water which consists of 97% of the total water on earth is absolutelynecessary. Self-compacting concrete (SCC) has dense microstructure. Knowledge about the microstructure and properties of each component a concrete and their relationship is useful to control the behavior. This research aims to know the relationship between compressive strength and microstructure characteristics of Self Compacting Concrete which using seawater up to the age of 90 days. The results of this study were the compressive strength of SCC using sea water is higher than the SCC using fresh water. Seawater does not reduce the strength of SCC concrete until the age of 90 days, but instead of Seawater is accelerating the development of SCC concrete strength at an early age. The compressive strength of concrete SCC is influenced by the phase microstructure (especially with tobermorite and portlandite) formed in the concrete.

Recipe and Technological Factors’ Influence on Vibrocentrifuged Basalt Fiber Concrete Strength and Deformation Properties

2021 ◽  
Vol 1043 ◽  
pp. 15-25
Author(s):  
Levon Maylyan ◽  
Sergey Stel'makh ◽  
Evgeniy Shcherban' ◽  
Alla Smolyanichenko ◽  
Diana El'shaeva
Keyword(s):  
Vibration Mode ◽  
Concrete Strength ◽  
Basalt Fiber ◽  
Fiber Reinforcement ◽  
Technological Parameters ◽  
Technological Factors ◽  
Deformation Properties ◽  
Fiber Concrete ◽  
Aggregate Fractions ◽  
Strength And Deformation

In order to optimize the basalt-fiber-concrete mixtures compositions, as well as to determine the most effective technological parameters in vibrocentrifugation technology, a compositional plan of experiments has been developed. Within the framework of the proposed experimental setup for creating vibrocentrifuged samples of annular cross-section with a variatropic structure, the following technological factors have been identified and considered: the clamps’ technological protrusions height; vibration mode (asynchronous - A, punctuational - P, synchronous - S). The clamps’ technological protrusions height varied within the following limits: 2.5 mm; 5 mm; 10 mm. The change in the percentage of coarse aggregate fractions and the percentage of fiber reinforcement was considered as the prescription factors. The percentage of fiber reinforcement varied within the following limits: 3.5%; four %; 4.5%. The content of fraction 5-10 in relation to fraction 10-20 varied within the following limits: 40 %; 50 %; 60 %. Based on the results obtained, it can be concluded that the most effective will be the use of clamps with a height of technological protrusions equal to 5 mm, with an alternating vibration mode, a percentage of fiber reinforcement equal to 4, and with a content of fractions of 5-10 mm and 10-20 mm equal percentage.

The Behavior Study of Reinforced Concrete in an Aggressive Environment

2019 ◽  
Vol 32 ◽  
pp. 53-61
Author(s):  
Nassima Khial ◽  
Youcef Bellal
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Characteristics ◽  
Sea Water ◽  
Concrete Strength ◽  
Fundamental Parameter ◽  
Concrete Durability ◽  
Corrosion Initiation ◽  
Surrounding Environment ◽  
Behavior Study ◽  
Physical And Chemical

Concrete is today the most widely used building material in the world; it has experienced a real boom in its association with steel in reinforced concrete. The mechanical and chemical complementarity between these two materials has made it possible to build economically and reliably the structures required for all human activities, hence sustainability becomes both a requirement and a major concern of manufacturers. It is therefore essential that the functions of the reinforced concrete are not reduced and that its properties are not altered. However, it is a reactive and a porous material able to the physical and chemical degradations in contact with its environment, due to a chemical reaction between these two media.In this work, we are interested in characterizing and monitoring the ions chloride penetration in reinforced concrete. For this purpose, specimens of the reinforced slab type are made with a composition standardized according to the DREUX-Gorisse method, and we have followed the concrete’ mechanical characteristics evolution in parallel with the immersion / drying cycles’ slab in the sea water. This development was followed with an ultrasound device for a period of about thirty two (32) months. After this period, the reinforcements’ electrochemical behavior by cyclic voltammetry, in these slabs was studied in order to determine the corrosion rate.The results indicated that there is a relationship between the concrete’ strength and the state of its reinforcements with the surrounding environment. On the other hand, the coating thickness is a fundamental parameter of the reinforced concrete durability which makes it possible to lengthen the corrosion initiation.

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