scholarly journals Study on sliding stability of porous-concrete retaining wall model test subjected to rainfall infiltration

2021 ◽  
Vol 930 (1) ◽  
pp. 012101
Author(s):  
E A Suryo ◽  
E Arifi ◽  
Y Zaika
Keyword(s):  
Retaining Wall ◽  
Lateral Load ◽  
Annual Rainfall ◽  
Wall Material ◽  
Concrete Wall ◽  
Loading Test ◽  
Wall Model ◽  
Conventional Concrete ◽  
Concrete Walls ◽  
Porous Concrete

Abstract The common disadvantage of a conventional retaining wall is a heavy object as a block that is difficult to lift and handle conveniently. A drainage pipe is commonly used to displace water from the backfill. In areas with high annual rainfall, the soil could be saturated in a short time and added lateral load significantly. In this study, porous concrete was utilized as a retaining wall material with the advantages of the lighter weight of the block and additional drainage capability due to its high void ratio. A set of a laboratory-scale retaining walls using conventional and porous concrete walls was investigated through three different rainfall modes. To initiate the instability condition, a vertical load was applied then the lateral moving was recorded using LVDT sensors. Soil moisture content sensors recorded hydrologic responses of the saturation process. The loading test results showed that the porous concrete wall model was being displaced less than experienced by the conventional concrete wall. It shows that the porous concrete wall model can withstand the load as the additional lateral load from infiltrated rainwater dissipates rapidly. Therefore, the porous concrete wall has the advantage of being used as a Retaining Wall Material.

scholarly journals Experimental Study on the Seismic Behavior of a Steel-Concrete Hybrid Structure with Buckling Restrained Braces

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Liang Li ◽  
Guoqiang Li ◽  
Tianhua Zhou
Keyword(s):  
Dynamic Properties ◽  
Hybrid Structure ◽  
Shaking Table ◽  
Steel Beams ◽  
Shaking Table Tests ◽  
Concrete Wall ◽  
Loading Test ◽  
Concrete Walls ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Capacity

The damage to a concrete wall caused by a strong earthquake is generally concentrated at the bottom of the concrete wall, which seriously threatens the safety of the steel-concrete hybrid structure and is very difficult to repair after an earthquake. In this paper, a steel-concrete hybrid structure with buckling restrained braces at a scale of 1/10 is constructed and tested on a shaking table. First, the mechanical properties of the BRBs are obtained through a static reciprocating loading test. Then, the dynamic properties and seismic response of the steel-concrete hybrid structure with BRBs are obtained through shaking table tests. The results show that (1) the energy dissipation capacity of the BRBs is very good, and none of the BRBs buckle during the shaking table tests; (2) the steel beams and columns are basically in an elastic state; (3) all the cracks on the concrete wall are microcracks, which are widely distributed in floors 1–8 of the concrete walls; (4) the maximum interstory drift angle reaches 1/40, which indicates that the ductility of the steel-concrete hybrid structure is very good. In conclusion, BRBs can significantly improve the seismic performance of the steel-concrete hybrid structures.

scholarly journals Comparative Study of High-Performance Concrete Characteristics and Loading Test of Pretensioned Experimental Beams

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 427
Author(s):  
Pavlina Mateckova ◽  
Vlastimil Bilek ◽  
Oldrich Sucharda
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Load Capacity ◽  
Materials Testing ◽  
Loading Test ◽  
Conventional Concrete ◽  
Concrete Mechanical Properties ◽  
Normal Strength

High-performance concrete (HPC) is subjected to wide attention in current research. Many research tasks are focused on laboratory testing of concrete mechanical properties with specific raw materials, where a mixture is prepared in a relatively small amount in ideal conditions. The wider utilization of HPC is connected, among other things, with its utilization in the construction industry. The paper presents two variants of HPC which were developed by modification of ordinary concrete used by a precast company for pretensioned bridge beams. The presented variants were produced in industrial conditions using common raw materials. Testing and comparison of basic mechanical properties are complemented with specialized tests of the resistance to chloride penetration. Tentative expenses for normal strength concrete (NSC) and HPC are compared. The research program was accomplished with a loading test of model experimental pretensioned beams with a length of 7 m made of ordinarily used concrete and one variant of HPC. The aim of the loading test was to determine the load–deformation diagrams and verify the design code load capacity calculation method. Overall, the article summarizes the possible benefits of using HPC compared to conventional concrete.

Experimental of Inverted-T Shape Reinforced Concrete Wall Subjected to Blast Load

2021 ◽  
Vol 879 ◽  
pp. 254-262
Author(s):  
Mazlan Abu Seman ◽  
Sharifah Maszura Syed Mohsin ◽  
Ahmad Mujahid Ahmad Zaidi ◽  
Md Fuad Shah Koslan ◽  
Zainorizuan Mohd Jaini
Keyword(s):  
Reinforced Concrete ◽  
Blast Resistance ◽  
Retaining Wall ◽  
Construction Material ◽  
High Strength ◽  
Steel Reinforcement ◽  
Blast Load ◽  
Structural Element ◽  
Concrete Wall ◽  
Flexural Reinforcement

Reinforced concrete (RC) widely used as the construction material for the main structural element for many significant structures such as bridge and building because of its relatively high strength and economical. However, there still lacks research published regarding the appropriate reinforcement steel arrangement in a complete RC structure subjected to blast load. Most of the published experimental works focused on the small rectangular or square RC panel. From the record search, the approved design by professional engineers, when RC wall subjected to the possibility of blast load, both RC wall details either retaining wall or shear wall implemented. Therefore, the full-scale blast experiment is vital to appraise the appropriate steel reinforcement arrangement in the RC wall. The blast experiment indicated, with different steel reinforcement arrangement in the RC wall, the better blast resistance with the number of cracks on the RC wall is significantly less from one another for the wall with the arrangement of horizontal flexural reinforcement tied-outside the vertical flexural reinforcement and the hooked-in direction of vertical flexural steel reinforcement into the wall base.

scholarly journals Neutrons along the labyrinth of high energy medical accelerators: Effect of wall materials

2019 ◽  
Vol 21 ◽  
pp. 169
Author(s):  
M. Fakinou ◽  
I. E. Stamatelatos ◽  
J. Kalef-Ezra
Keyword(s):  
Monte Carlo ◽  
Cost Effective ◽  
High Energy ◽  
Wall Material ◽  
Mcnp Code ◽  
Dose Equivalent ◽  
Concrete Wall ◽  
Ambient Dose Equivalent ◽  
Wall Materials ◽  
Ambient Dose

Neutron streaming along the labyrinth of a generic bunker of an 18MV medical accelerator was evaluated. Monte Carlo simulations using MCNP code were performed to calculate neutron ambient dose equivalent along the labyrinth. The effect of plain, borated and barites concrete wall material, as well as borated concrete and plywood (Celotex), as neutron absorbing wall liners, was examined. The results of the study suggest that plywood can provide a cost effective material to attenuate neutron streaming along the labyrinth.

scholarly journals Biomechanical Effects of Diameters of Implant Body and Implant Platform in Bone Strain around an Immediately Loaded Dental Implant with Platform Switching Concept

2019 ◽  
Vol 9 (10) ◽  
pp. 1998
Author(s):  
Hsuan Lung ◽  
Jui-Ting Hsu ◽  
Aaron Yu-Jen Wu ◽  
Heng-Li Huang
Keyword(s):  
Dental Implants ◽  
Lateral Load ◽  
Strain Gauges ◽  
Bone Strain ◽  
Vertical Load ◽  
Artificial Bone ◽  
Implant Stability ◽  
Loading Test ◽  
Platform Switching ◽  
Post Hoc

Dental implants designed with platform switching have been used clinically to reduce crestal bone resorption. The aim of this study was to determine the biomechanical effects of loading types, diameter of platform, and implant diameter in bone strain around immediately loaded implants with platform switching concept. Platform-switching features of dental implants with various diameters of implant body and implant platform (named as RP5.0, RP4.3, and NP3.5) were inserted into artificial bone blocks. The initial implant stability was confirmed using a Periotest device before the loading test. Rosette strain gauges were placed on the alveolar region around the implants, and peak values of the bone strain during a 190-N vertical load or 30-degree lateral load were measured by a data acquisition system. The Kruskal-Wallis test and post-hoc pairwise comparisons were performed as statistical analyses. The median Periotest values of the RP5.0, RP4.3, and NP3.5 implants ranged from −6.59 to −7.34. The RP5.0 implant always showed the lowest bone strain around the implant, regardless of whether a vertical or lateral load was applied. Relative to the RP4.3 and NP3.5 implants, the RP4.3 implant produced a higher bone strain (by approximately 8%) under a vertical load but a lower bone strain (by approximately 25%) under a lateral load. This study confirmed that using a wider implant could relieve the bone strain around an immediately loaded implant with platform switching concept especially under lateral loading.

STRENGTH OF POROUS CONCRETE PAVEMENT AT DIFFERENT CURING METHODS

2015 ◽  
Vol 76 (14) ◽  
Author(s):  
Mohd Ibrahim Mohd Yusak ◽  
Ramadhansyah Putra Jaya ◽  
Mohd Rosli Hainin ◽  
Che Ros Ismail ◽  
Mohd Haziman Wan Ibrahim
Keyword(s):  
Concrete Strength ◽  
Concrete Pavement ◽  
Experimental Results ◽  
Conventional Concrete ◽  
Curing Conditions ◽  
Porous Concrete ◽  
Curing Methods ◽  
And Performance ◽  
Curing Method ◽  
Tensile Splitting Strength

Porous concrete pavement has been used in some countries as a solution to environmental problems. Contrary to conventional concrete pavement, there is still lack of knowledge in some areas of production and performance of porous concrete pavement. One of the issue concern is curing conditions. These greatly affect the performance of porous concrete pavement. This paper elaborates the experimental results examining the influence of curing method and makes a comparison between five different curing methods on the strength of porous concrete pavement specimens. The properties analyzed include compressive strength, tensile splitting strength and flexural strength. The experimental results indicate that the different curing methods give a different effect to concrete strength. Based on the results obtained in this experiment, curing method by using polyethylene bag promise a good result and better performance to porous concrete pavement specimen strength.

scholarly journals The Peseudo-Static Displacement Calculation of Reinforced and Unreinforced Soil Walls in Frictional Cohesive Soils Using Horizontal Slices Method

2018 ◽  
Vol 7 (3.14) ◽  
pp. 202
Author(s):  
Mojtaba Ahmadabadi ◽  
Maryam Bahrami ◽  
Zari Taheri ◽  
Samaneh Mardani
Keyword(s):  
Wedge Angle ◽  
Soil Parameters ◽  
Cohesive Soils ◽  
Concrete Wall ◽  
Maximum Displacement ◽  
Concrete Walls ◽  
Wall Displacement ◽  
Soil Walls ◽  
Comparison Of The Results ◽  
Different Soils

Horizontal slices method is a simple and efficient tool for analysis of retaining walls. In this paper, using some of the principles of equilibrium and horizontal slices method, an analytical approach is presented to determine the displacement of concrete walls in the reinforced and unreinforced soils. The formulation of the so-called method is able to calculate wall displacement and critical wedge angle displacement for frictional cohesive soils and draw the distribution of displacement in the wall height. Based on the proposed method, a simple equation is presented to calculate the wedge angle of rupture in the frictional cohesive soils in seismic condition. Comparison of the results with previous methods and numerical methods shows that horizontal slices are able to analyze the concrete wall displacement, while the proposed method has the advantage of analyzing walls via considering soil parameters such as adhesion, seismic coefficients, and the number of reinforcements. In contrast with previous methods that ignored the cohesion concrete wall characteristics, the offered method considers all wall and soil parameters. In addition, design charts are presented for different soils and walls. Considering wall displacement, maximum displacement of wall, displacement of wall apex, and maximum place of wall displacement are obtained, revealing that critical wedge angle displacement is different from rupture wedge angle of pressure imposed on wall. 

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