scholarly journals Performance of Reinforced Reactive Powder Concrete Beam-Column Joints under Cyclic Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Wenzhong Zheng ◽  
Dehong Wang ◽  
Yanzhong Ju
Keyword(s):  
Shear Strength ◽  
Concrete Beam ◽  
Safety Margin ◽  
Strength Degradation ◽  
Reactive Powder Concrete ◽  
Cyclic Loads ◽  
Failure Characteristics ◽  
Column Joint ◽  
Shear Cracking ◽  
Reactive Powder

An experimental research was carried out to investigate the seismic performance and shear strength of reactive powder concrete interior beam-column joints subjected to reverse cyclic loads. Four beam-column joint specimens were cast and tested in the investigation. The failure characteristics, deformational properties, ductility, and energy dissipation of reinforced reactive powder concrete interior beam-column joints were analyzed in this paper. The shear strength of joints was calculated according to the GB5001-2010 and ACI 318-14. The results shows that reactive powder concrete beam-column joints have a higher shear-cracking strength and shear carrying capacity and strength degradation and rigidity degradation are not notable. Additionally, the use of RPC for beam-column joints can reduce the congestion of stirrups in joints core. The shear force in the RPC joint is mainly carried by the diagonal strut mechanism; the design expression of ACI 318-14 can be used for calculating the shear strength of RPC joints, which has a safety margin of 22%∼38% in this test.

scholarly journals Effect of Hospital Effluents and Sludge Wastewater on Foundations Produced from Different Types of Concrete

2019 ◽  
Vol 5 (4) ◽  
pp. 819-831 ◽  
Author(s):  
Aamer Najim Abbas ◽  
Lubna M. Abd ◽  
Muhannd W. Majeed
Keyword(s):  
Shear Strength ◽  
Fresh Water ◽  
Domestic Wastewater ◽  
Punching Shear ◽  
Reactive Powder Concrete ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Hospital Effluents ◽  
Normal Strength ◽  
Reactive Powder

In last decades, there is an insufficiency of fresh water and construction works are increasing day by day consuming large amount of fresh water. Therefore research is processing on to employ the treated domestic wastewater in the preparation and curing of concrete. In this investigation, the concrete slab specimens casted with normal strength concrete and modified reactive powder concrete. The concrete specimens cast by using fresh water, wastewater, and hospital effluents water. The specimens cured in all water types for 28days and 56 days. At 28days curing with wastewater, a decrease in punching shear strength was observed from 24 kN in case of curing with fresh water to 21 kN and 20 kN in case of curing with wastewater and hospital effluents water respectively. Highest strength is exhibited by 56 days curing age, it was recorded about 32 kN, 24 kN and 23 kN punching shear strength of specimens cured with fresh water, wastewater and hospital effluents water respectively. The excess quantity of bicarbonates in treated domestic wastewater as curing water results a decrease in compressive strength of concrete specimens. Appearance of first crack was also affected significantly by using wastewater and hospital effluents water as curing water; 7.5 kN, 6.5 kN and 6 kN were the first crack loads of normal strength concrete panels cured with fresh water, wastewater and hospital effluents water, and 11 kN, 10 kN and 7.5 kN were the first crack loads of modified reactive powder concrete cured with fresh water, wastewater and hospital effluents water.

scholarly journals The Hysteretic Behavior of Partially Pre-Stressed Beam-Column Joint Sub-assemblages Made of Reactive Powder Concrete

2016 ◽  
Vol 48 (5) ◽  
pp. 550-570 ◽  
Author(s):  
Siti Aisyah Nurjannah ◽  
◽  
Bambang Budiono ◽  
Iswandi Imran ◽  
Saptahari Sugiri ◽  
...  
Keyword(s):  
Hysteretic Behavior ◽  
Reactive Powder Concrete ◽  
Column Joint ◽  
Reactive Powder

Effect of maximum grain size on value of modulus of rupture reactive powder concrete

2020 ◽  
Vol 26 (1) ◽  
pp. 1-8
Author(s):  
Widodo Kushartomo ◽  
Dewi Linggasari ◽  
Arianti Sutandi
Keyword(s):  
Concrete Beam ◽  
Aggregate Size ◽  
Modulus Of Rupture ◽  
Reactive Powder Concrete ◽  
Fine Aggregate ◽  
Steam Curing ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Buckling Failure ◽  
Reactive Powder

Modulus of rupture (R) is a measurement of a tensile strengh of a concrete beam. The value of R is affected by the size of fine aggregat grain, the density of the concrete beam and the water-cement ratio. The unit of R is MPa expressing the tensile strength of the concrete beam without reinforcement to withstand a buckling failure. The distance between the supports of the concrete beam should not be less than three times of the height of the beam. In this research the size of the concrete beam speciment was 100 mm x 100 mm x 350 mm, the maximum fine aggregate size was varied (300 µm, 425 µm, and 600 µm) and the water-cement ratio was also varied (0.25, 0.22 and 0,20). All speciments were cured by steam curing and were tested after seven days. The results show that the larger the size of the fine aggregat grain and the higher the water-cement ratio, the smaller the R.

scholarly journals Shear Strength of Steel Fiber Reinforced Reactive Powder Concrete & Geopolymer Concrete – A Comparison

2021 ◽  
Author(s):  
Aravind S Kumar ◽  
Bharati Raj J ◽  
Keerthy M Simon
Keyword(s):  
Shear Strength ◽  
Steel Fiber ◽  
Load Capacity ◽  
High Strength ◽  
Steel Fibers ◽  
Reactive Powder Concrete ◽  
Polymer Concrete ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Reactive Powder

Reactive Powder Concrete (RPC) is an ultra-high strength concrete composite prepared by the replacement of natural aggregates with quartz powder, silica fume and steel fibers. The use of RPC yields high strength, high ductile concrete with optimized material use and contributes to economic, sustainable and ecofriendly constructions. Past research has indicated that RPC offers significant improvement in the mechanical and physical properties owing to its homogenous composition with less defects of voids and microcracks. This leads to enhancement of ultimate load capacity of RPC members and results in superior ductility, energy absorption, tensile strain-hardening behavior, crack control capability and durability. Geo-polymer concrete (GPC) is a type of concrete that is made by reacting aluminate and silicate bearing materials with a caustic activator. Usually, waste materials such as fly ash or slag from iron and metal production are used, which helps lead to a cleaner environment. This paper attempts to review the effect of steel fibers on the shear strength of steel fiber reinforced RPC and compare the results with those of geopolymer concrete.

Performance of Reactive Powder Concrete Partial Prestressed Beam-Column Sub-Assemblage Structure System with Partial Prestressed Ratio Exceeds 30%

2016 ◽  
Vol 845 ◽  
pp. 126-131
Author(s):  
Siti Aisyah Nurjannah ◽  
Bambang Budiono ◽  
Iswandi Imran ◽  
Saptahari Sugiri
Keyword(s):  
High Performance ◽  
Structural Engineering ◽  
High Performance Concrete ◽  
Reactive Powder Concrete ◽  
Cyclic Loads ◽  
Test Results ◽  
Ultra High Performance Concrete ◽  
Moment Frame ◽  
Concrete Type ◽  
Reactive Powder

Research on concrete material in many countries resulted a concrete type of Ultra High Performance Concrete (UHPC) which has a high performance in terms of compressive strength, ductility, durability, and modulus of elasticity using Reactive Powder Concrete (RPC). Research on structural engineering using RPC material shows better performance than normal concrete (NC) to resist gravity and cyclic loads. In this study, the experiments were conducted under the combination of constant axial and cyclic loads on the structure of the partial prestressed interior and exterior beam-column subassemblages with partial prestressed ratio value of 31.72% on the beam. The application of cyclic loading was conducted by displacement control based on the ACI 374.1-05. The purpose of this study was to determine the performance of structures based on three moment frame acceptance criteria presented in the ACI 374.1-05. From the test results, the interior and exterior beam-column subassemblage structure systems showed performance that adequated all of these criteria at the drift ratio of 3.50% and 2.20%, respectively.

scholarly journals Direct Shear Strength of RPC Member

2021 ◽  
Vol 39 (1A) ◽  
pp. 22-33
Author(s):  
Shahad Q. Madhlom ◽  
Hussein A. Aziz ◽  
Ammar A. Ali
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Steel Fiber ◽  
Shear Loading ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Direct Shear ◽  
Steel Rebar ◽  
Transverse Steel ◽  
Reactive Powder

In this research paper, results are obtained from Reactive Powder Concrete (RPC) push-off specimens - double L shape subjected to direct shear loading. Different parameters considered are compressive strength, percentages of steel fiber, presence of aggregate and shear reinforcement. The results show that increasing in steel fiber content starting from 0.0% and ending with 1.5% leads to increases in the shear strength by (261%) and attempt to decrease its brittleness. The presence of steel fiber content enhances and improves the tensile strength and  the shear strength. Using RPC in constructing the specimens enhances the shear strength by 29.6% compared with NSC specimen. Shear strength increased by 25% when the compressive strength increased from 75 to 90MPa. The presence of transverse steel rebar in the direction of shear line increased the shear strength by (108.3%) as compare with the specimen without shear rebar. The presence of small aggregate in RPC mix creates an increase in the shear strength by (9.1%).

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