scholarly journals Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1748
Author(s):  
Jun Suk Lee ◽  
Byeong Hun Woo ◽  
Jae-Suk Ryou ◽  
Jee-Sang Kim
Keyword(s):  
Tensile Strength ◽  
Performance Assessment ◽  
High Strength Concrete ◽  
Load Capacity ◽  
High Strength ◽  
Confinement Effect ◽  
The Other ◽  
Strength Concrete ◽  
Nominal Tensile Strength ◽  
Post Tensioned

Post-tensioned anchorage zones need enough strength to resist large forces from jacking forces from prestress and need spiral reinforcement to give confinement effect. High-strength concrete (HSC) has high-strength and brings the advantage of reducing material using and simplifying reinforcing. We tested strain stabilization, load–displacement, and strain of lateral reinforcements. Specimens that used one and two lateral reinforcements without spiral reinforcement did not satisfy the strain stabilization. Load capacity also did not satisfy the condition of 1.1 times the nominal tensile strength of PS strands presented in ETAG 013. On the other hand, specimens that used three and four lateral reinforcements without spiral reinforcement satisfied the strain stabilization but did not satisfy 1.1 times the nominal tensile strength of PS strands. However, the secondary confinement effect could be confirmed from strain stabilization. In addition, the affection of HSC characteristics could be confirmed from a reinforcing level comparing other studies. The main confinement effect could be confirmed from the reinforcement strain results; there was a considerable difference between with and without spiral reinforcement at least 393 MPa. Comprehensively, main and secondary confinement effects are essential in post-tensioned anchorage zones. In addition, the performance of the anchorage zone could be increased by using HSC that the combination of high-strength and confinement effect.

Influence of Nano Particles in the Flexural Behavior of High-Strength Reinforced Concrete Beams

2021 ◽  
Vol 1160 ◽  
pp. 25-43
Author(s):  
Naglaa Glal-Eldin Fahmy ◽  
Rasha El-Mashery ◽  
Rabiee Ali Sadeek ◽  
L.M. Abd El-Hafaz
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Nano Particles ◽  
Flexural Behavior ◽  
Single Type ◽  
Strength Concrete ◽  
Flexural Ductility

High strength concrete (HSC) characterized by high compressive strength but lower ductility compared to normal strength concrete. This low ductility limits the benefit of using HSC in building safe structures. Nanomaterials have gained increased attention because of their improvement of mechanical properties of concrete. In this paper we present an experimental study of the flexural behavior of reinforced beams composed of high-strength concrete and nanomaterials. Eight simply supported rectangular beams were fabricated with identical geometries and reinforcements, and then tested under two third-point loads. The study investigated the concrete compressive strength (50 and 75 N/mm2) as a function of the type of nanomaterial (nanosilica, nanotitanium and nanosilica/nanotitanium hybrid) and the nanomaterial concentration (0%, 0.5% and 1.0%). The experimental results showed that nano particles can be very effective in improving compressive and tensile strength of HSC, nanotitanium is more effective than nanosilica in compressive strength. Also, binary usage of hybrid mixture (nanosilica + nanotitanium) had a remarkable improvement appearing in compressive and tensile strength than using the same percentage of single type of nanomaterials used separately. The reduction in flexural ductility due to the use of higher strength concrete can be compensated by adding nanomaterials. The percentage of concentration, concrete grade and the type of nanomaterials, could predominantly affect the flexural behavior of HSRC beams.

Flexural and Splitting Tensile Strength of High Strength Concrete with Diatomite Micro Particles as Mineral Additive

2020 ◽  
Vol 402 ◽  
pp. 50-55 ◽  
Author(s):  
Muttaqin Hasan ◽  
Aulia Desri Datok Riski ◽  
Taufiq Saidi ◽  
Husaini ◽  
Putroe Nadhilah Rahman
Keyword(s):  
Tensile Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Tensile Tests ◽  
Splitting Tensile Strength ◽  
Strength Concrete ◽  
Micro Particles ◽  
Mineral Additive ◽  
Binder Ratio ◽  
Water To Binder Ratio

This paper presents the flexural and splitting tensile strength of high strength concrete (HSC) with diatomite micro particles (DMP) as a mineral additive. In order to have micro particles, the diatomite from Aceh Besar District was ground and sieved with sieve size of 250 mm. The particles were then calcined at the temperature of 600 °C for 5 hours. Four mixtures were designed with different DMP to binder ratio (DMP/b). The ratio was 0%, 5%, 10% and 15%, and the water to binder ratio was 0.3. Four beam specimens with a size of 10 cm × 10 cm × 40 cm and four cylinder-specimens with 10 cm diameter and 20 cm high were prepared for each mixture. Flexural and splitting tensile tests were conducted based on ASTM C78 and ASTM C496/496M. The maximum flexural strength was reached at DMP/b of 5% while the maximum splitting tensile strength was reached at DMP/b of 0%.

Performance assessment of high strength concrete comprising marble cutting waste and fly ash

2020 ◽  
Author(s):  
Rajesh Gupta ◽  
Rakesh Choudhary ◽  
Abhishek Jain ◽  
Rohit Yadav ◽  
Ravindra Nagar
Keyword(s):  
Fly Ash ◽  
Performance Assessment ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete

Compressive Strength and Splitting Tensile Strength of Steel Fiber Reinforced Ultra High Strength Concrete (SFRC)

2010 ◽  
Vol 34-35 ◽  
pp. 1441-1444 ◽  
Author(s):  
Ju Zhang ◽  
Chang Wang Yan ◽  
Jin Qing Jia
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
Volume Fraction ◽  
High Strength ◽  
Splitting Tensile Strength ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Strength Concrete

This paper investigates the compressive strength and splitting tensile strength of ultra high strength concrete containing steel fiber. The steel fibers were added at the volume fractions of 0%, 0.5%, 0.75%, 1.0% and 1.5%. The compressive strength of the steel fiber reinforced ultra high strength concrete (SFRC) reached a maximum at 0.75% volume fraction, being a 15.5% improvement over the UHSC. The splitting tensile strength of the SFRC improved with increasing the volume fraction, achieving 91.9% improvements at 1.5% volume fraction. Strength models were established to predict the compressive and splitting tensile strengths of the SFRC. The models give predictions matching the measurements. Conclusions can be drawn that the marked brittleness with low tensile strength and strain capacities of ultra high strength concrete (UHSC) can be overcome by the addition of steel fibers.

scholarly journals IMPACT OF USING STONE POWDER AND MINERAL ADMIXTURES IN HIGH STRENGTH CONCRETE

2020 ◽  
Vol 4 (5) ◽  
pp. 82-87
Author(s):  
Afzal Basha Syed ◽  
Jayarami Reddy B ◽  
Sashidhar C
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Mineral Admixtures ◽  
Test Results ◽  
Concrete Technology ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Strength Concrete

In present era, high-strength concrete is progressively utilized in modern concrete technology and particularly in the construction of elevated structures. This examination has been directed to explore the properties of high-strength concrete that was delivered by using stone powder (SP) as an option of extent on sand after being processed. The aim of the research is to study the effect of replacement of sand with stone powder and substitution of cement with mineral admixtures (GGBS & Zeolite) on the mechanical properties of high strength concrete. The test results showed clear improvement in compression and split tensile nature of concrete by using stone powder and mineral admixtures together in concrete. The increment in the magnitude of compressive strength and split tensile strength are comparable with conventional concrete.

scholarly journals An Experimental Development on Properties of Concrete with GGBS in Addition with Alkaline Solution of Sodium Hydroxide and Sodium Silicate

2019 ◽  
Vol 8 (2) ◽  
pp. 5306-5310
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
Research Work ◽  
High Strength ◽  
Blast Furnaces ◽  
Experimental Development ◽  
Strength Concrete ◽  
Binding Material ◽  
Almost All

Becoming modern waste have discovered the need to transfer of mechanical waste, The waste that must be arranged would two be able to be spared to use in some way, among the two modern waste preparing cementatious nature substances can be supplanted as folio include number in cement to separated. Ground Granulated Blast Furnaces Slag (GGBS) which used to be squander from an iron assembling industry, which used to be utilized as substitute of bond in cement because of its characteristic solidifying properties. To increase the strength of the concrete some of the special cements are used. Due to various codal specifications the binding material replacements of GGBS have been restricted up to 80% in maximum. In this project replacement of GGBS is done by an amount of 10% ,20% ,30% and 40%. In accordance with above restrictions the replacement variations in binding material have been decoded in a high strength concrete mixture. The research work have been extensively executed in almost all areas of testing like compressive strength , spilt tensile strength, and flexural strength, and also various primary tests like specific gravity , granular gradation etc. have also been excited to achieve high strength concrete.

Sign in / Sign up

Export Citation Format

Share Document