scholarly journals EFFECT OF CURING BY DIFFERENT POLLUTED WATER ON THE STRUCTURAL BEHAVIOR OF RC SLABS

2021 ◽  
pp. 1-8
Author(s):  
Muhannd Waleed Majeed ◽  
Lubna Mohammed Abd ◽  
Aamer Najim Abbas
Keyword(s):  
Waste Water ◽  
Ultimate Load ◽  
Crack Pattern ◽  
Environmental Conservation ◽  
Structural Behavior ◽  
Polluted Water ◽  
Hospital Waste ◽  
Curing Conditions ◽  
Water Problem ◽  
Rc Slabs

There was a serious water problem especially in the region close to the sewer treatment plants. Therefore, an effort has been made to utilize the waste water from the sewer treatment plants for building purposes, so that the water problem can be greatly minimized and the waste water can be properly disposed of  for good environmental conservation. Foundation panels in severe curing conditions performed by hospital waste water and   sewer waste water.. This article highlights an experimental analysis on the behavior of concrete foundations in severe curing conditions performed by hospital waste water and sewer waste water. The experiment measured ultimate load, first crack load, load-deflection behavior, stiffness and evaluated the crack pattern of 12 reinforced concrete foundation panels after curing the specimens for 28 days. The results of the test indicate that the use of hospital and sewer waste water could reduce the strength, stiffness and accelerate damage of tested panels. Mechanical properties such as compressive strength, elastic modulus, flexural strength, etc. were examined by pouring various concrete samples in the element of cubes, cylinders and prisms, etc. and were concluded to be acceptable.

Study on Water Quality Improvement of Streams in Baoan District, Shenzhen City, China

2011 ◽  
Vol 347-353 ◽  
pp. 1902-1905
Author(s):  
Hua Li You
Keyword(s):  
Waste Water ◽  
Mathematical Model ◽  
Water Quality ◽  
Fresh Water ◽  
Water Discharge ◽  
Water Environment ◽  
Oxygen Demand ◽  
Polluted Water ◽  
Integrated Analysis ◽  
Shenzhen City

Water is the basis of natural resources and strategic economic resources.Deteriorated water environment of streams in Shenzhen city could have a great impact on ecological safety, people's health,and economic development.Based on the data of field observation and Remote sensing (RS) image,integrated analysis of the water degradation causes,and the changes of biochemical oxygen demand in five days(BOD5）concentration by mathematical model were carried out,which is on basis of percentage of waste water disposal,fresh water transformation,and harbor excavation, respectively.The results show that degradation causes of water quality were resulted from waste water discharge, harbor construction,and ecological environment damage, which could lead to slowly water exchange. Accordingly,the pollution can be easily to store in the bay,which result in water quality changes.The most important improved countermeasure is the control of waste water, which could be had a great effectiveness to decrease pollution.In addition, fresh water must be supplied after polluted water was cut off,which can be better improvement for water quality.This would be extreme improvement for hydrological dynamics due to 15m harbor excavation,which can significantly reduce BOD5 concentration.The innovation points of this paper is to mathematical model,which is based on the basis of qualitative analysis.

scholarly journals Structural Behavior of Precast Lightweight Foam Concrete Sandwich Panel with Double Shear Truss Connectors under Flexural Load

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Noridah Mohamad ◽  
A. I. Khalil ◽  
A. A. Abdul Samad ◽  
W. I. Goh
Keyword(s):  
Compressive Strength ◽  
Sandwich Panel ◽  
Crack Pattern ◽  
Structural Behavior ◽  
Foam Concrete ◽  
Structural Behaviour ◽  
Shear Connectors ◽  
Double Shear ◽  
Partially Composite ◽  
Lightweight Foam

This paper presents the structural behaviour of precast lightweight foam concrete sandwich panel (PFLP) under flexure, studied experimentally and theoretically. Four (4) full scale specimens with a double shear steel connector of 6 mm diameter and steel reinforcement of 9 mm diameter were cast and tested. The panel’s structural behavior was studied in the context of its ultimate flexure load, crack pattern, load-deflection profile, and efficiency of shear connectors. Results showed that the ultimate flexure load obtained from the experiment is influenced by the panel’s compressive strength and thickness. The crack pattern recorded in each panel showed the emergence of initial cracks at the midspan which later spread toward the left and right zones of the slab. The theoretical ultimate load for fully composite and noncomposite panels was obtained from the classical equations. All panel specimens were found to behave in a partially composite manner. Panels PLFP-3 and PLFP-4 with higher compressive strength and total thickness managed to obtain a higher degree of compositeness which is 30 and 32.6 percent, respectively.

scholarly journals Structural Behavior of Lightweight Composite Slab System

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Nur Adidah Sutiman ◽  
◽  
Masni A. Majid ◽  
Zainorizuan Mohd Jaini ◽  
Aina Syafawati Roslan ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Ultimate Load ◽  
Major Effect ◽  
Structural Behavior ◽  
Minor Effect ◽  
Composite Slab ◽  
Four Point Bending ◽  
Point Test ◽  
Foamed Concrete ◽  
Infill Material

This study investigate the structural behavior of lightweight composite slab system that consist of profiled steel sheet (PSS) attached to dry board (DB) using mechanical screws and with or without infill materials. A total four full-scale panel specimen were tested under four-point bending when subjected under static loading. Result of the four-point test shows that increasing the thickness of profiles steel sheet gives major effect to the deflection and ultimate load. The deflection and ultimate load of 1.0mm thick panel specimen is 16.45% and 34.45% respectively. Therefore, increased the thickness of profiled steel sheet can enhance the stiffness and strength of the lightweight composite slab systems. It also found that the infill material used in these experimental gives minor effect to deflection and ultimate load. The deflection and ultimate load of panel specimen with foamed concrete is 21.18% and 16.66% respectively. Thus, foamed concrete can be used only for non-structural purposed only such as sound proofing and fire resistance.

Evaluation of internal blast resistance of bi-directionally prestressed concrete tubular structure according to ANFO explosive charge weight

2021 ◽  
Author(s):  
Ji-Hun Choi ◽  
Seung-Jai Choi ◽  
Tae-Hee Lee ◽  
Dal-Hun Yang ◽  
Jang-Ho Jay Kim
Keyword(s):  
Prestressed Concrete ◽  
Explosive Charge ◽  
Blast Resistance ◽  
Crack Pattern ◽  
Structural Behavior ◽  
Charge Weight ◽  
Property Damage ◽  
Blast Pressure ◽  
Prestressing Loss ◽  
Real Scale

When extreme loading from an internal is applied to prestressed concrete (PSC) structures, serious property damage and human casualties may occur. However, existing designs for PSC structures such as prestressed concrete containment vessels (PCCV) do not include features to protect the structure from the blasts. Therefore, the internal blast resistance capacity of PSC structures is evaluated by internal blast tests on bi-directional PSC tubular members. The goal of the study was to obtain the structural behavior data from an internal detonation. The ANFO charges were detonated at the center of the mid-span of the tube specimen with a standoff distance of 1,000 mm. The data acquired included blast pressure, deflection, strain, crack pattern, and prestressing loss. The data are used derive the equations to calculate the required internal blast charge weight to fail a real-scale PCCV and to calibrate a commercial simulation program to be used for internal blast simulations.

scholarly journals Structural Behavior of Concrete Beams Containing Recycled Coarse Aggregates under Flexure

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
In-Hwan Yang ◽  
Jihun Park ◽  
Kyoung-Chul Kim ◽  
Hyungbae Lee
Keyword(s):  
Experimental Data ◽  
Flexural Strength ◽  
Concrete Beams ◽  
Crack Pattern ◽  
Crack Spacing ◽  
Experimental Results ◽  
Structural Behavior ◽  
Experimental Program ◽  
Coarse Aggregates

The structural behavior of concrete beams containing recycled coarse aggregates (RCAs) was investigated in this study using detailed experimental data. Twelve concrete beams were tested in the experimental program: nine beams with varying RCA contents and three control beams with natural coarse aggregates (NCAs). The parameters for investigating the structural behavior of the RCA concrete beams under flexure were the RCA content (30%, 50%, and 100%) and tensile rebar ratio (0.50%, 0.79%, and 1.14%). The crack pattern of the RCA beams was similar to that of the NCA beams; however, the RCA beams exhibited smaller crack spacing than the NCA beams. The flexural strength was slightly affected by the RCA content. However, the ductility of the beam was not significantly influenced by the RCA content. A comparison of the experimental results and the calculations from the ACI 318 and EC 2 provisions for the flexural strength showed that the current provisions conservatively predicted the flexural strength of the RCA concrete beams.

PERFORMANCE OF CONNECTED PRECAST LIGHTWEIGHT SANDWICH FOAMED CONCRETE PANEL UNDER FLEXURAL LOAD

2015 ◽  
Vol 75 (9) ◽  
Author(s):  
Noridah Mohamad ◽  
Abdul Aziz Abdul Samad ◽  
Noorwirdawati Ali ◽  
Josef Hadipramana ◽  
Norwati Jamaluddin
Keyword(s):  
Failure Modes ◽  
Ultimate Load ◽  
Core Layer ◽  
Crack Pattern ◽  
Control Panel ◽  
Structural Behaviour ◽  
The Core ◽  
Steel Bar ◽  
Mode Of Failure ◽  
Foamed Concrete

This paper investigates the structural behaviour of two connected Sandwiched Precast Lightweight Foamed Concrete Panel (PLFP) in term of their load bearing capacities and failure modes. Three (3) connected PLFP panels were cast using foamed concrete as the wythe and polystyrene as the core layer. Each connected panel were cast from two single panels connected using L-bar connection. The panels were strengthened with steel bar reinforcement embedded in both wythes which were connected to each other by the steel shear truss connectors. The connected PLFP panels were tested under flexural load. A single PLFP panel was cast as a control panel and tested under axial load. The results were analysed in term of the panel’s ultimate load, crack pattern and mode of failure. Results showed that the two connected PLFP panels were able to sustain slightly lower ultimate load compared to single PLFP panel. Crack at 45 degree angle at top half of panel and small crack at surface between joint of the connection were observed.

scholarly journals Performance of wood ash blended reinforced concrete beams under acid (HCl), base (NaOH) and salt (NaCl) curing conditions

2018 ◽  
Vol 7 (3) ◽  
pp. 1045 ◽  
Author(s):  
B Tejo Manikanta ◽  
V Ranga Rao ◽  
M Achyutha Kumar Reddy
Keyword(s):  
Ultimate Load ◽  
Concrete Beams ◽  
Wood Ash ◽  
Reinforced Concrete Beams ◽  
Challenging Problem ◽  
Cement Concrete ◽  
Coastal Regions ◽  
Curing Conditions ◽  
Durability Properties ◽  
Reinforced Cement

Nowadays disposal of wood ash generated from various sources became a very challenging problem. Utilization of wood ash in cement and concrete was started from last 10 years. In this research, an attempt was done to examine the durability properties of reinforced cement concrete with 5, 10, 15 and 20 percentage replacement of cement with wood ash in concrete. The specimens with all proportions were cast, cured 28 days for one set specimens while another 3 set were cured in acid (HCl), base (NaOH) & salt (NaCl) conditions for 90 days. All specimens were tested to failure under loading frame of 500 kN capacity with 1 kN/sec as the rate of loading, weight loss, ultimate load, and deflection were determined. The better performance is shown by blended specimens against NaCl, NaOH and week resistance against HCl. The concrete with 5 percent replaced with wood ash can be used coastal regions as a result of greater resistance to against NaCl.  

Structural Behaviour of Beam with HDPE Plastic Balls Subjected to Flexural Load

2017 ◽  
Vol 889 ◽  
pp. 270-274
Author(s):  
Noridah Mohamad ◽  
Wan Inn Goh ◽  
Abdul Aziz Abdul Samad ◽  
A. Lockman ◽  
Anas Alalwani
Keyword(s):  
Reinforced Concrete ◽  
High Density Polyethylene ◽  
Concrete Beam ◽  
Ultimate Load ◽  
Reinforced Concrete Beam ◽  
Crack Pattern ◽  
Maximum Deflection ◽  
Structural Behaviour ◽  
Tension Cracks ◽  
Spherical Voids

This paper presents the structural behaviour of reinforced concrete beam embedded with high density polyethylene balls (HDPE) subjected to flexural load. The HDPE balls with 180 mm diameter were embedded to create the spherical voids in the beam which lead to reduction in its self-weight. Two beam specimens with HDPE balls (RC-HDPE) and one solid beam (RC-S) with dimension 250 mm x 300 mm x 1100 mm were cast and tested until failure. The results were analysed in the context of its ultimate load, load-deflection profile, and crack pattern and failure mode. It was found that the ultimate load of RC-HDPE was reduced by 32% compared to RC-S beam while the maximum deflection at its mid span was increased by 4%. However, RC-HDPE is noticed to be more ductile compared to RC-S beam. Both types of beams experienced flexure cracks and diagonal tension cracks before failure.

scholarly journals Flexural Capacities of Reinforced Concrete Two-Way Bubbledeck Slabs of Plastic Spherical Voids

2013 ◽  
Vol 6 (2) ◽  
pp. 9-20
Author(s):  
Amer M. Ibrahim ◽  
Nazar K. Ali ◽  
Wissam D. Salman
Keyword(s):  
Ultimate Load ◽  
Compressive Strain ◽  
Bubble Diameter ◽  
Crack Pattern ◽  
The Self ◽  
Flexural Behavior ◽  
Slab Thickness ◽  
Building Structures ◽  
Two Dimensional ◽  
Spherical Voids

This paper presents the flexural capacities of R.C two way hollow slabs of plastic spherical voids, also known as BubbleDeck slab system. Recently, various types of slab systems which can reduce the self-weight of slabs have been studied as the height and width of building structures rapidly increase (1). A biaxial hollow slab system is widely known as one of the effective slab systems which can reduce the self-weight of slabs (1). A BubbleDeck slab has a two-dimensional arrangement of voids within the slabs to reduce self-weight (2). The behavior of BubbleDeck slabs is influenced by the ratio of bubble diameter to slab thickness. To verify the flexural behavior of this BubbleDeck slab such as ultimate load, deflection, concrete compressive strain and crack pattern, two-dimensional flexural tests were tested by using special loading frame. Six test of specimens were used. Two were a conventional RC slab and four were BubbleDeck slabs having void diameter to slab thickness ratios of (0.51, 0.64 and 0.80). Results have shown that the crack pattern and flexural behavior depend on the void diameter to slab thickness ratio. The ultimate load capacities for BubbleDeck slabs having bubble diameter to slab thickness of (0.٥1 and 0.64) were the same of solid slabs, while when bubble diameter to slab thickness of (0.80) the ultimate capacities were reduced by about (10%).

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