DEFLECTIONS IN BEAMS OF SELF-COMPACTING CONCRETE AND CONVENTIONAL CONCRETE FOR ALONG-TERM PROCESS (original) (raw)
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Development trends for high rise constructions, modern skyscrapers are indicating that building of such constructions with normal concretes and low consistency is impossible, therefore there is a need for concrete with high processes because of great amount of reinforcement in cross section of concrete elements. Solution for such construction is self-compacted concrete because of ability to fill good formworks without compaction and vibration. In this line, we conducted an experimental research to determine the mechanical characteristics of concrete, cracks, strains, deflections, strains on long term process and strains at failure test. The experimentally-obtained results will be presented for both types of concrete for: compression strength, splitting tensile strength, strains on concrete and strains on reinforcement for duration failure testing time t = 40 days. .
Development trends for high rise Building or structures, modern skyscrapers request the different workability of fresh concrete to cast in properly way and to achieve the requested results. The many of factors such are: highest of the cast concrete, sections of concrete elements, request the concrete with more plasticity and higher class of consistency, the smaller size of aggregate, the compacted process, etc. The fulfilling the previous condition, using the Self Compacted Concrete is one of the aims in this paper. Considering this fact, researches for deflections, mechanical characteristics of concrete and strains have been conducted worldwide. In this line, we conducted an experimental research to determine the deflections on beams of self-compacted concrete and compared it with conventional concrete. The experimentally-obtained results will be presented for both types of concrete for: module of elasticity and deflections tests for duration testing time t=40 days.
Concrete is a material which has found a wide usage in engineering especially in construction engineering and road infrastructure facilities. Development trends for high rise constructions, modern skyscrapers indicate that building such constructions with normal concretes and low consistency is impossible, therefore there is a need for concrete with high processes because of great amount of reinforcement in cross-section of concrete elements. Solution for such construction is self-compacting concrete because of its ability to fill good formworks without compaction and vibration. Considering this fact, researches for cracks, mechanical characteristics of concrete and deformations have been conducted worldwide. In this line, we conducted an experimental research to determine the cracks on beams of selfcompacting concrete and compared it with conventional concrete. The experimentallyobtained results will be presented for both types of concrete for: module of elasticity, compression strength, crack with and cracks spacing for duration failure testing time t = 400 days.
Development trends for high rise constructions, modern skyscrapers indicate that building such constructions with normal concretes and low consistency is impossible, therefore there is a need for concrete with high processes because of great amount of reinforcement in cross-section of concrete elements. Solution for such construction is self-compacting concrete because of its ability to fill good formworks without compaction and vibration. Considering this fact, researches for cracks, mechanical characteristics of concrete and deformations have been conducted worldwide. In this line, we conducted an experimental research to determine the cracks on beams of self-compacting concrete and compared it with theoretical results on the middle of beam on long term process.
Mechanical and Structural Behavior of Reinforced Self-Compacting Concrete Beam
International Journal of Innovative Research in Engineering & Management (IJIREM), 2023
In this study, the punching shear of slabs and the flexural and shear behaviour of reinforced concrete beams were investigated in connection to the type of concrete (self compacting concrete (SCC) and normal concrete (NC)), and compressive strength (40 MPa). To achieve these objectives, two beam have been furnished, tested, and reviewed. First, one consists of SCC beam and the second one consists of NC beam. We are add admixtures like fly ash and GGBS. According to test results, for beams that failed in flexure, SCC beams showed a similar ultimate load to NC beams. When it came to slender beams collapsing in shear, NC beams showed a 6.75% higher ultimate load than SCC beams for beams , whereas beams with fc' 40 MPa showed nearly the same ultimate load value. The final loads for SCC and NC beams for beams did not differ noticeably. It was discovered that SCC slabs displayed a 17.25% higher ultimate punching shear load than NC slabs for the six geometrically similar slabs (three slabs made with SCC and three slabs made with NC of various concrete strengths) that were intended to fail in punching shear.
FLEXURAL BEHAVIOUR OF SELF COMPACTING CONCRETE BEAMS
This paper presents the detailed investigation of the combined effect of the cementitious materials (Fillers) in the fresh and hardened properties of Self Compacting Concrete (SCC). The investigation includes blend of Ordinary Portland Cement (OPC) and Fly ash (FA) in which OPC is partially replaced with certain percentage of FA(25%, 30%, 35%, 40%, 45%).The Control mixture contained Ordinary Portland Cement (OPC) replaced with 20 % of Fly ash (FA) by the weight of OPC. The use of fillers (FA) reduced the hydration in cement and provides cohesion to the concrete. The total binder content of 550 kg/m 3 and water binder ratio of 0.34 were taken as constant for all the mixes. This paper presents the experimental investigation of fresh properties like Slump flow test, L Box, U Box ,V funnel and T 50 time and the Hardened properties in the strength aspects like Compressive strength, Split tensile strength and Flexure strength of beams for all the mixes were compared. Based on the results optimum replacement percentage of FA and flexural behaviour of beams was studied. But the mix with 35%FAexhibits better performance than all other mixes.
Mechanical Characteristics of Self-Compacting Concrete
Self-compacted concrete is a material that recently has been widely used in construction engineering structures and therefore research into its mechanical characteristics is of particular importance as the materials used for its manufacture in terms of quantity differ from composite materials of normal concrete. Based on this we have realized practical proofs for the analysis of these characteristics, which have been carried out according to the respective standards depending on the type of evidence. In this paper, we will present the laboratory results for solidity in printing, Solidity in curvature through cracking, solidity in curvature of curvature prism specimens, concrete precision, velocity of sound penetration in concrete samples, elastic modulus. In the wet concrete phase, self-compacted concrete has a certain number of tests that are not performed on normal concrete, thus we will present laboratory results for L-box, J-ring and V-funnel.
Deformations in the Short-Term Process on Self-Compacting Concrete for Repaired Beams
EngRN: Structural Engineering (Topic), 2020
Based on the very good properties for putting on the work of self-compacting concrete, today in the world has increased its use in the construction of high-rise buildings. Self-compacting concrete has very good viscosity which makes it suitable for pumping and at the same time compacting.<br><br>Based on the fact that self-compacting concrete does not have the same content of its constituent components as normal concrete, then we can say that both mechanical characteristics and deformations in concrete as in the short time process as well as deformations in the long process can not be same.<br><br>To verify the difference in the results of the information from the action of loads in the short time process as well as from the action of loads in the long process we conducted an experiment on beams from normal concrete, beams from self-compacting concrete and beams repaired with self-compacting concrete.<br><br>To determine the mechanical characteris...
Mechanical properties of conventional and self-compacting concrete: An analytical study
h i g h l i g h t s " We developed new modulus of elasticity models for self-compacting and conventional concrete. " We developed new tensile strength models for self-compacting and conventional concrete. " We developed new compressive stress-strain model for self-compacting and conventional concrete. " We verified proposed models against experimental results.
Cement and Concrete Research, 2001
An experimental and numerical study on mechanical properties, such as strength, elastic modulus, creep and shrinkage, of selfcompacting concrete (SCC) and the corresponding properties of normal compacting concrete (NC) is outlined in this article. The study included eight mix proportions of sealed or air-cured specimens with water ± binder ratio (w/b) varying between 0.24 and 0.80. Half of the mixes studied were based on NC. The age at loading of the concretes in the creep studies varied between 2 and 90 days. Four different stress to strength levels were studied. Parallel studies were performed on strength (f c) and relative humidity (RH). The results show that elastic modulus, creep and shrinkage of SCC did not differ significantly from the corresponding properties of NC. The ongoing study was started in 1997.