Compressive strength prediction model of high-strength concrete with silica fume by destructive and non-destructive technique

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Rahul Biswas ◽  
Baboo Rai ◽  
Pijush Samui
Keyword(s):  
Compressive Strength ◽  
Prediction Model ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Prediction ◽  
Strength Concrete ◽  
Non Destructive

Strength and Ductility of High-Strength Concrete Cylinders Externally Confined with Steel Strapping Tensioning Technique (SSTT)

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Hoong-Pin Lee ◽  
Abdullah Zawawi Awang ◽  
Wahid Omar
Keyword(s):  
Compressive Strength ◽  
Prediction Model ◽  
High Strength Concrete ◽  
High Strength ◽  
Transverse Strain ◽  
Envelope Curve ◽  
Stress Strain ◽  
Strength Concrete ◽  
Concrete Cylinders ◽  
Strain Relationship

This research study is to introduce and investigate an effective technique of external pre-tensioning using steel strapping (SSTT) to reduce the brittleness and enhance the ductility of high-strength concrete cylinders.  Fifteen cylinders with dimension of 150 mm and 300 mm in diameter and height respectively were casted, pre-tensioned with two and four layers of steel strapping and tested to failure under uniaxial monotonic and cyclic compression. The behaviour of SSTT confined cylinders was studied through their stress-strain relationship upon the longitudinal deflection, transverse strain, mode of failure, confinement ratio, and existence of an envelope curve. It is experimentally proved that SSTT confinement do helps in controlling the brittleness problem of high-strength concrete and at the same time, enhancing both the concrete ductility and compressive strength up to 46.2 % and 112.5 % respectively. The envelope curve of uniaxial cyclic loading also coincides with the corresponding monotonic loading curve, regardless of any loading activity. The observed stress-strain relationship of confined cylinders with different confining ratios are compared with existing strength and strain models and a stress-strain prediction model, the result showed a linear relationship between the compressive strength and strain enhancement and confining ratio, with acceptable agreement between the prediction model.

Analysis of Post-Combustion High-Strength Concrete Compressive Strength Using Polypropylene Fibers

2020 ◽  
Vol 26 (1) ◽  
pp. 118-127
Author(s):  
Teuku Budi Aulia ◽  
Muttaqin Muttaqin ◽  
Mochammad Afifuddin ◽  
Zahra Amalia
Keyword(s):  
Compressive Strength ◽  
Thermal Stress ◽  
Silica Fume ◽  
High Temperatures ◽  
High Strength Concrete ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Concrete Compressive Strength ◽  
Strength Concrete ◽  
Maximum Value

High-strength concrete is vulnerable to high temperatures due to its high density. The use of polypropylene fibers could prevent structure explosion by forming canals due to melted fibers during fire, thus release its thermal stress. This study aims to determine the effect of polypropylene fibers on compressive strength of high-strength concrete after combustion at 400ºC for five hours. High-strength concrete was made by w/c-ratio 0.3 with cement amount 550 kg/m3 and added with silica fume 8% and superplasticizer 4% by cement weight. The variations of polypropylene fibers were 0%, 0.2% and 0.4% of concrete volume. The compression test was carried out on standard cylinders Ø15/30 cm of combustion and without combustion specimens at 7 and 28 days. The results showed that compressive strength of high-strength concretes without using polypropylene fibers decreased in post-combustion compared with specimens without combustion, i.e., 0.81% at 7 days and 23.42% at 28 days. Conversely, the use of polypropylene fibers can increase post-combustion compressive strength with a maximum value resulted in adding 0.2% which are 25.52% and 10.44% at 7 and 28 days respectively. It can be concluded that the use of polypropylene fibers is effective to prevent reduction of high-strength concrete compressive strength that are burned at high temperatures.

scholarly journals Influence of Different Drying Conditions on High Strength Concrete Compressive Strength

10.14311/228 ◽  
2001 ◽  
Vol 41 (3) ◽  
Author(s):  
M. Safan ◽  
A. Kohoutková
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Concrete Compressive Strength ◽  
Strength Concrete ◽  
Development Rates ◽  
Drying Conditions

The influence of different drying conditions on the compressive strength and strength development rates of high strength concrete up to an age of 28 days was evaluated. Two HSC mixes with and without silica fume addition were used to cast cubes of 10 cm size. The cubes were stored in different drying conditions until the age of testing at 3, 7, 28 days.

Effect of Silica Fume and Fly Ash on Compressive Strength and Weight Loss of High Strength Concrete Material in Sulfuric and Acetic Acid Attack

2017 ◽  
Vol 748 ◽  
pp. 301-310 ◽  
Author(s):  
Wei Liu ◽  
Hong Lin Tan ◽  
Cheng Lin Ni ◽  
Zhi Bin Chen ◽  
Tian Zong Luo ◽  
...  
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Acetic Acid ◽  
Fly Ash ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Corrosion Mechanism ◽  
Acid Attack ◽  
Strength Concrete

This issue mainly studied the compressive strength and weight loss of high strength concrete in sulfuric and acetic acid attack. Different substitution amounts of silica fume and fly ash single single incorporated and co-incorporated in cement to form high strength concrete. Then weight losses, XRD and SEM were carried out to investigate compressive strength and acid resistance corrosion mechanism after leaching in 5% H2SO4 and 5% CH3COOH solution for 28 days. The results show S10F12 improves the compressive strength by 29.6%, 40.5% and 28.4% in 7, 28 and 56 days curing respectively compared to OPC. The improvement of resistant to 5% H2SO4 and 5% CH3COOH of S10F12 is 38.3% and 112.5% for 28 days immersion respectively, and S10f12 still has compressive strength of 58.8 MP and 45.9 MPa under 5% H2SO4 and 5% CH3COOH attack while OPC only has 38.8MPa and 21.6 MPa after 28 days immersion.

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