Print ISSN: 1992-7428

Online ISSN: 2706-686X

Volume 8, Issue 1

Volume 8, Issue 1, Summer and Autumn 2012, Page 1-80

Performance of Fiber normal – weight concrete Exposed to Elevated Temperatures

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 1-14
DOI: 10.37650/ijce.2012.69012

The main rule of this search is determining the effect adding various types of fiber to normal concrete mixes on performance normal strength concrete ,it has been used three types of fibers (glass, short steel fibers& long steel fibers)with different contents in mixes(0.5,1.0&1.5%) respectively.
It had been cast (210) cubes with dimensions (100×100×100m) mm,(160) cylinders with dimensions (100×200) mm , All concrete specimens heated under different temperatures (100,200,300,400,500 &600 C°) at age 28 days, so that it had been stayed under specified temperatures about two hours then , cooled in naturally in room temperatures and tested in compressive for cubes &splitting strength for cylinders. The results stated that the fiber improve the compressive strength under fire temperatures about (87%) compare with reference mixes, and the fiber glass take little differences than steel fiber in splitting strength when its content reach (1.0,1.5%) respectively and using this types of fibers improved the properties of concrete against the fire.

Approximate Analytical Solutions for Large Flexural and Shear Deformations of Uniformly Loaded Simply Supported Bimodular Beam

Dhafer Kh. Jadan

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 1-16
DOI: 10.37650/ijce.2012.68993

In this paper an analytical approximate solution for large flexural deformations, shear deformations
and shear stresses of a bimodular uniformly loaded simply supported beam has been developed.
Verification for the solution has been performed using FEM analysis with ANSYS. The results of
the program were very close the results of the analytical solution presented in this paper.

Effect of Curing methods on the Compressive Strength of concrete

Nadom Khalifa Mutlib; Nida Majeed; Waad Abdullatieef Saeed

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 15-25
DOI: 10.37650/ijce.2012.69013

This paper is dedicated for studying the effect of curing methods on the compressive strength of concrete by using five methods of curing which are: the British method which is carried out by immersing the specimens in water starting after 24 hours of casting, then putting them in polyethylene bags- which are closed tightly- till the date of testing .The second method is carried out by covering specimens with burlap and sprinkling the specimens twice a day. The third method is carried out by immersing the specimens with water. The fourth method is carried out by sprinkling the specimens twice a day. And the last method is to paint the specimens with flint coating to prohibit the water from escaping by evaporation. The results showed that the British method is the best one for compressive strength values (36.66,31.26,25.83 MPa(, also the method of immersion in water has a close values to this method especially after 28 days. It has been noticed that the results of the fifth method have the smallest values and for all ages of curing (19.65,19.18,18.24 MPa).

Finite Element Simulation of the Bearing Capacity of an Unsaturated Coarse-Grained Soil

Mohammed Y. Fattah; Khalid R. Mahmood; Muataz M. Muhyee

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 17-28
DOI: 10.37650/ijce.2012.69001

The mechanical behaviour of partially saturated soils can be very different from that of fully saturated soils. It has long been established that for such soils, changes in suction do not have the same effect as changes in the applied stresses, and consequently the effective stress principle is not applicable.
A procedure was proposed to define the soil water characteristic curve. Then this relation is converted to relation correlating the void ratio and matric suction. The slope of the latter relation can be used to define the H-modulus function. This procedure is utilized in the finite element analysis of a footing on unsaturated coarse grained soil to investigate its bearing capacity.
The finite element results demonstrated that there is a significant increase in the bearing capacity of the footing due to the contribution of matric suction in the range 0 to 6 kPa for the tested compacted, coarse-grained soil. The ultimate pressure increases from about 120 kPa when the soil is fully saturated to about 570 kPa when the degree of saturation becomes 90%. This means that an increase in the bearing capacity of about 375% may be obtained when the soil is changed from fully saturated to partially saturated at a degree of saturation of 90%. This development in the bearing capacity may exceed 600% when the degree of saturation decreases to 58%.

Development and Use of Large-Scale Land Information System (LIS) by Using Geographic Information System (GIS) and Field Surveying

Asma Th. Ibraheem; Afrah M. Daham

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 29-43
DOI: 10.37650/ijce.2012.69009

Cadastral maps are an important component of land administration in most countries. In virtually all
developed countries, the needs of computerized land and geographic information systems (LIS/GIS)
has given urgent impetus to computerizing cadastral maps and creating digital cadastral data bases
(DCDB). This process is creating many institutional, legal, technical and administrative problems.
This desire to establish DCDBs is being given increased impetus due to a new range of enabling
technologies such as satellite position fixing (GPS), improved spatial data collection techniques
such as digital theodolites and "soft copy" photogrammetry, as well as a vast range of new
information and communications technological tools, thus contributing to the advancement and
keep up with the great countries.
This paper presents the problem of cadastral maps. The hitherto existing cadastre, consisting of
paper maps and land registers, is now becoming insufficient. Its shortcomings force developments
leading to its improvement. One of the ways is the creation of a Land Information System. A digital
cadastral map is the main component of this system. The structure and information content of the
map is presented, its differences from analogue maps are shown, and the process of map creation is
described. A digital cadastral map can be the basis for additional thematic layers, successively
converting it into a complex system for management of administrative units.

Alternative Cracking Shear Strength Equation for Reinforced Concrete Normal Beams without Stirrups

Ali Hussein Ali Al-Ahmed

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 44-49
DOI: 10.37650/ijce.2012.69002

This paper presents a new and improved design procedure in shear for reinforced concrete normal members without shear reinforcement (stirrups) using the techniques of dimensional analysis and multiple regression analysis. A total of 334 data sets have been obtained from existing sources of reinforced concrete shear test results covering a wide range of beam properties and test methods. The proposed equation is applied to existing test data for these reinforced concrete normal beams (shear span to depth ratio (a/d) greater than or equals to 2.0) and the results are compared with those predicated by ACI and BS codes. It can be also noted that the test results are in better agreement with the proposed cracking shear strength equation because of the excellent correlation between experimental results and theoretical values.

Behaviour of Self-Consolidating Concrete Two Way Slabs Under Uniform Loading

Dr. Mohammed Mohammed Rasheed; Nibras Nizar Abduhameed

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 50-61
DOI: 10.37650/ijce.2012.69004

An experimental investigation was conducted to study the strength, behaviour and deflection characteristics of two way slabs made with both self-consolidating concrete (SCC) and conventional concrete (CC). Six concrete slabs were tested to failure under simply supported uniform by distributed loading conditions. The variables were concrete type and macro synthetic fibres ratio (0%, 0.07% and 0.14%). The performance was evaluated based on crack pattern, ultimate load, load-deflection response and failure mode. The results showed that the ultimate strength of SCC slabs was larger than that of their CC counterparts. The results also showed an improvement of the behaviour and strength of slabs by adding the synthetic fibres.

Improving the Performance of Conventional Wastewater Treatment Plants

Ali Hadi Ghawi; Zaidun Naji Abudi

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 62-73
DOI: 10.37650/ijce.2012.69006

Secondary clarifiers form a crucial component in gravity separation processes mainly in solid-liquid separation. They perform the crucial process of separating the activated sludge from the clarified effluent and also to concentrate the settled sludge. As treatment plants receive increasingly high wastewater flow, conventional sedimentation tanks suffer from overloading problems which result in poor performance. Inlet baffle modification by using an energy dissipating inlet (EDI) was proposed to enhance the performance in the circular clarifiers in Al-Dewanyia wastewater treatment plant. A 3-Dimensional fully mass conservative clarifier model was applied to evaluate proposed tank modification and to estimate the maximum capacity of the existing and modified clarifiers. A Computational Fluid Dynamics (CFD) model was formulated to describe tank performance and design parameters were obtained based on the experimental results. The study revealed that velocity and SS are better parameters than TS, BOD5, and COD to evaluate the performance of sedimentation tanks. Removal efficiencies of suspended solids, biochemical oxygen demand, and chemical oxygen demand were higher in the EDI (Baffle).

The Effect of Super fine Materials on Some Properties of Hot Mix Asphalt Concrete

Adil N. Abed; Sadoon O. Eyada

Iraqi Journal of Civil Engineering, 2012, Volume 8, Issue 1, Pages 74-80
DOI: 10.37650/ijce.2012.69008

The super fine materials constitute that portion of mineral filler finer than 10 microns. The effectiveness of these materials comes from their relation with asphalt film thickness. Asphalt cement grade (40-50) has been used. Nibaay course aggregate and Thmail fine aggregate were combined to achieve the aggregate gradation confirms with the Iraqi Standard Specifications for dense graded mix. Six different types of filler from five locally different sources in Iraq had used and subjected to grain size distribution, specific gravity and chemical composition tests. To study the effect of super fine materials on the performance of HMA mixture, Marshall stiffness, Indirect tensile strength, Moisture susceptibility and Creep tests have been made. Statistical analysis for results has been made. The conclusions referred to the importance of super fine materials due to their effect on HMA concrete properties.