Evaluation of compressive strength of concrete members laterally confined by various FRP composites and exposed to high temperatures

2015 ◽  
Vol 20 (6) ◽  
pp. 2410-2419
Author(s):  
WooYoung Jung ◽  
MinHo Kwon ◽  
BuSeog Ju
Keyword(s):  
Compressive Strength ◽  
High Temperatures ◽  
Concrete Members ◽  
Frp Composites ◽  
Compressive Strength Of Concrete

scholarly journals The relationship between the compressive strength and ultrasonic pulse velocity concrete with fibers exposed to high temperatures

2018 ◽  
Vol 3 (1) ◽  
pp. 31
Author(s):  
Belaribi Hassiba ◽  
Mellas Mekki ◽  
Rahmani Fraid
Keyword(s):  
Compressive Strength ◽  
Ultrasonic Velocity ◽  
High Temperatures ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cement Ratio ◽  
Compressive Strength Of Concrete ◽  
The Relationship ◽  
The Waves

The paper analyses the effects of high temperatures on the concrete residual strength using ultrasonic velocity (UPV). An experimental investigation was conducted to study the relationship between UPV residual data and compressive strength of concrete with different mixture proportions, cubic specimens with water-cement ratio of 0.35. They were heated in an electric furnace at temperatures ranging from 200°C to 600°C. In this experiment a comparison was made between the four groups which include two types of fibers steel 0,19%, 0,25% and 0,5%, polypropylene: 0,05%, 0,11% 0,16 % by volume. Cube specimens were tested in order to determine ultrasonic velocity. The compressive strength was tested too. According to the results, relations were established between ultrasonic velocity in the specimens and the compressive strength at different temperature and the range of the velocity of the waves were also determined for this kind of concrete. Result of the test showed that UPV test can be successfully used in order to verify the consistency of structures damaged by fire.

scholarly journals Increasing the Contribution of GFRP Bars on the Compressive Strength of Concrete Columns with Circular Cross Section

2019 ◽  
Vol 5 (8) ◽  
pp. 1850-1862
Author(s):  
Amir Reza Tabkhi Wayghan ◽  
Massood Mofid ◽  
Behnam Babaei Ravandi ◽  
Seyed Morteza Zinati Yazdi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Circular Cross Section ◽  
Concrete Columns ◽  
Concrete Cover ◽  
Concrete Members ◽  
Glass Fiber Reinforced ◽  
Frp Reinforcement ◽  
Compressive Strength Of Concrete ◽  
Concrete Elements

Corrosion of steel in concrete elements is a major issue in concrete structures. In order to overcome this matter, Glass Fiber Reinforced Polymer (GFRP) reinforcement is being used in concrete members from almost 20 years ago. Although it has been used and developed in recent years, there are still some uncertainties for the application of FRP reinforcement, especially in concrete columns.  Most codes such as ACI, CSA, JSCE & etc. neglects the effect of these reinforcements or they do not permit them in compressive concrete elements. In this essay, it has been shown that these rebar can contribute significantly in compressive strength of concrete columns if the column confinement is provided sufficiently. In order to achieve the required confinement to reach a sharp contribution of GFRP longitudinal rebar in concrete columns, the spiral of FRP rebar with small pitches around longitudinal rebar is taken into account. This leads to higher strains of concrete which can result in a higher contribution of FRP longitudinal rebar. Foremost, equations related to the compressive strength of concrete columns considering the influence of spiral confinement will be carried out. Then, a parametric study will be performed, and the effects of pitch, concrete strength, column diameter, the quantity of longitudinal rebar and concrete cover will be investigated.

scholarly journals Effect of Selected Curing Methods on Density and Compressive Strength of Concrete for Technological Self-Reliance

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Grace M Amusan ◽  
Monsuru O Popoola ◽  
Jelili O Shittu
Keyword(s):  
Compressive Strength ◽  
Construction Projects ◽  
Physical And Mechanical Properties ◽  
Sustainable Growth ◽  
Cement Ratio ◽  
Concrete Members ◽  
Self Reliance ◽  
Curing Methods ◽  
Compressive Strength Of Concrete ◽  
Curing Age

The quest to deliver construction projects within the shortest possible time handled many engineers to maneuver curing ages of concrete and this has been a major concern in construction industries due to associated failures of concrete members emanating from improper curing. This study therefore aimed at investigating the effect of different curing methods on density and compressive strength of concrete with a view to enhancing technological self-reliance of the nation. Concrete cube specimens (150 mm × 150 mm × 150 mm) were cast using mix ratio 1:2:4 with 0.5 water-cement ratio. The concrete specimens were cured for 28 days using open air, ponding, sprinkling and dry covering curing methods. The compressive strength and density were evaluated. The data were validated. The results showed that the compressive strength increases with increasing curing age. The respective compressive strength values obtained for ponding, sprinkling, dry covering and open air curing methods were 22.04, 20.48, 17.28 and 16.02 respectively. The curing methods have compressive strengths in the order Ponding < sprinkling < dry covering < open air. The results of the curing methods on density were also noticed to be directly proportional to strength. Appropriate curing methods of concrete had greater impact in influencing physical and mechanical properties of concrete.Keywords: Concrete, Curing methods, Strength, Sustainable growth

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