Master’s Degree

Sep 1, 2009 - Mar 24, 2011

Master’s Degree in Structural Civil Engineering from the Engineering College , University of Mosul, Mosul, Iraq.

Bachelor of Engineering (B.Eng.)

Oct 1, 2004 - Jul 1, 2008

Bachelor of Engineering (B.Eng.) degree in Civil Engineering from the Engineering College, University of Mosul, Mosul, Iraq.

Effects of PVC and CFRP on confinement of reinforced concrete columns under eccentric load

Dec 26, 2023

Journal Asian Journal of Civil Engineering

publisher Springer

DOI https://doi.org/10.1007/s42107-023-00960-3

Volume 25

This work presents the empirical research on the confined reinforced concrete columns (CRCC) subjected to eccentricity force. The studying of CRCC using polyvinyl chloride (PVC) and carbon fiber-reinforced polymer (CFRP) is to explain the effect of PVC and CFRP on the bearing capacity and lateral stress of columns under eccentric load. This study was conducted on 2 unconfined circular reinforced concrete columns (control specimens) and 14 circular reinforced concrete columns confined by PVC and CFRP (two specimens for each variable). The diameter and height of the columns are 100 mm and 300 mm, respectively. Three of CRCC are confined by PVC (PVC-CRCC) with 2.5, 3 and 4 mm thicknesses. The rest of them are confined by CFRP laminates and PVC (CFRP-PVC-CRCC) with a constant PVC thickness (2.5 mm) and differ ent numbers of CFRP laminates (2, 3, 4 and 5). According to test results, the PVC-CRCC and CFRP-PVC-CRCC bearing capacity increased in the range of 8–133% depending on the PVC thickness and the number of CFRP laminates. Using of PVC led to improve the lateral confined stress from 2.75 to 4.4 MPa, while the improvement in lateral confined stress which occurred by CFRP varied from 3.7 to 11.8 MPa. The results also showed that PVC-CRCC failed due to the cracking of PVC tubes, whereas cutting and fracturing of CFRP laminates as well as cracking of PVC tubes have been noticed for the CFRP PVC-CRCC. The prediction of confined stress for PVC-CRCC and CFRP-PVC-CRCC is achieved with good agreement according to the previous literature data and data measured from this study.

Synergistic effect of the silica fume and glass powder as pozzolanic materials in cement mortar

Dec 19, 2023

Journal INTERNATIONAL JOURNAL OF SUSTAINABLE Building Technology and Urban Development

DOI , https://doi.org/10.22712/susb.20240004

Issue 1

Volume 15

The cement industry is currently grappling with numerous challenges, primarily stemming from substantial emissions of greenhouse gases, intensive energy utilization, and excessive exploitation of natural resources. Consequently, the prospect of substituting waste materials for virgin raw materials emerges as a viable solution to address environmental issues while simultaneously mitigating the consumption of Earth’s finite resources. Within the scope of this investigation, waste glass powder (GP) derived from end-of-life fluorescent lamps and silica fume (SF) were employed as pozzolanic substances to partially replace Portland cement (PC). The experimental procedures encompassed evaluations of flowability, density, compressive strength, direct tensile strength, and flexural strength at 7, 28, and 90 days, in conjunction with scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. According to the results, the contribution of SF and GP with cement led to improve the mechanical properties of cement mortar. The 5% was the appropriate proportion for both of SF and GP which were used as pozzolanic materials. Furthermore, this studyproposes an alternative method for reusing hazardous waste by directly incorporating GP without prior washing to reduce mercury content. This approach aims to decrease the use of Portland cement (PC), thus promoting environmental sustainability and resource efficiency

Nonlinear finite element Analysis of laterally loaded piles in Layered Soils

Jun 5, 2023

Journal Electronic Journal of Structural Engineering

publisher Electronic Journals for Science and Engineering - International Melbourne, Australia

DOI 10.56748/ejse.234003

Issue 3

Volume 23

This work is based on Winkler’s theory to analyze laterally loaded single piles using the finite element method. Soil nonlinearity is considered via nonlinear springs “p-y” curves. Exact element displacement shape functions and stiffness matrix are used for the element in the case of linear Winkler’s modulus of subgrade reaction. In the nonlinear stage, an averaging technique for the element secant Winkler modulus is used to calculate the shape functions and stiffness matrix. An iterative technique is used to consider the nonlinearity of the soil. Few elements are required to simulate the pile efficiently. Unlike other analytical methods, the current method can be used to analyze piles with any load-transfer curves with arbitrary variation with depth.

Experimental and analytical investigation on effect of openings in behavior of reinforced concrete deep beam and enhanced by CFRP laminates

Jan 2, 2023

Journal Structures

publisher ELSEVIER

DOI https://doi.org/10.1016/j.istruc.2023.01.013

Volume 48

This work studies the potential of producing web openings within the shear span for the reinforced concrete (RC) deep beams. Carbon fiber reinforced polymer (CFRP) laminates are used to improve the shear strength. 13 specimens with dimensions of 120, 750, and 1800 mm are prepared for the tests. Shapes of the web openings are square and circular with diameter of 230, 300, and 370 mm. Their locations are in the center, upper and lower of the shear span. Three angles for wrapping 0°, 45°, and 90° are used to strengthen the beams with circular openings. The shear strength of RC deep beams decreased in the range of 22–74 % depending on the diameter, location, and shape of the openings. While CFRP improved the shear strength, stiffness and toughness in about 17–48 %, 0.7–17 % and 4–20 % respectively. The previous percentages depended on size of openings and the orientation of CFRP laminates in RC deep beams with circular openings. The laminates of CFRP are able to repair and restore the bearing capacity of beams by approximately 100 % of the same beams before they failed. On the other hand, Strut and Tie method established to estimate the maximum strength of the RC deep beams and it results that the theoretical method succeeded in guessing the practical results.

Anchorage behavior of headed bars in reinforced concrete beams

Dec 16, 2020

Journal Structures

publisher ELSEVIER

DOI https://doi.org/10.1016/j.istruc.2020.12.066

Volume 29

Nine simply supported reinforced concrete beams of dimensions 150 × 150 × 700 mm have been tested to study the anchorage behavior of installed headed bars. The variables included the size of the added head plate, debonded length and loading type. Therefore, four head areas 28*28, 32*32, 35*35 and 38*38 mm, three debonded lengths 0, 300 and 600 mm and two loading types (one-point load and two-point load) are used in this research. The test results of load failure values, type of failure and deflection for eight beams provided with plate head and one beam of the non-head bar are being obtained. It was found that the value of load failure increased with using higher plate head size and lower debonding length. Furthermore, the percentages of decrease in deflection for beams that have head net size Anh/Ab (2.9, 4, 5, and 6) are 29%, 36%,38% and 44% respectively, and 12% and 55% when beams with debonding length 300 and 600 mm compared with beams of full bonded (zero debonded length). While the load failure for beams tested under two-points load was greater than beams which were tested under one-point load.

Enhancement of bonding efficiency between overlay and substrate concrete using Styrene Butadiene Rubber Latex and different surface roughness methods

Jun 8, 2020

Journal Engineering and Applied Science Research

publisher Faculty of Engineering, Khon Kaen University, Thailand

DOI https://ph01.tci-thaijo.org/index.php/easr/article/view/239868

Issue 1

Volume 48

The present study aims to accurately assess the binding efficiency between the substrate and the overlay using Styrene-Butadiene Rubber Latex (SBR) and ordinary Portland cement as a bonding mortar. Four different roughening techniques for the substrate surface were compared: surface roughening with a steel wire brush;, surface roughening by scarifying double parallel grooves in one direction; surface roughening by scarifying double parallel grooves in two directions; and surface roughening by scarifying double parallel grooves in one direction, drilling the substrate, and fixing screws in the double grooves. A total of 24 repaired prism specimens were tested for flexural strength with 45° and 90° angles between overlay and substrate. The cylinder specimens were also tested for splitting tensile strength and for slant shear strength at a 30° angle between overlay and substrate. The repaired specimens were cured at 23±2°C for 28 days before the flexural, splitting, and slant shear strength tests were performed. The experimental tests indicated that the best bonding strength was obtained in flexural strength tests when the surfaces were roughened by scarifying, carefully drilling the substrate, and fixing screws in the double grooves at a 45° angle between overlay and substrate.

Effect of Partial Replacement of Fly Ash and Expanded Polystyrene waste on Properties of Geopolymer Concrete Bricks

Dec 22, 2019

Journal Journal of Advanced Research in Applied Sciences and Engineering Technology

publisher PENERBIT AKADEMIA BARU

Issue 1

Volume 17

The present experimental investigation was mainly focused on two major axes. The first one was the possibility of producing lightweight geopolymer concrete bricks using expanded polystyrene (EPS) waste and fly ash. The second axis was predicting the physical and mechanical properties of the geopolymer concrete bricks using nondestructive testing (NDT) techniques. (NDT) techniques viz Schmidt rebound hammer (RH), ultrasonic pulse velocity (UPV) and ((SonReb)) combined method. The NDT techniques were performed to compare the accuracy between the RH, UPV and ((SonReb)) method in predicting compressive strength of geopolymer concrete bricks. For these purposes, 25 different geopolymer concrete mixes were designed using EPS with different ratios (0, 10, 20, 30, 40 and 50%) as a partial replacement of coarse aggregates and fly ash (class F) by (0, 20, 40, 60 and 80%) as partial replacement of cement. A combination of sodium hydroxide (10M) and sodium silicate solution was used as an alkaline activator with a ratio of Na2SiO3/NaOH kept at 2.0, geopolymer bricks were designed with dimensions of 240 * 120 * 80 mm (6 bricks per mix). The physical and mechanical properties of the geopolymer concrete bricks were studied. Non-destructive testing techniques NDT has been used to predict correlation relationships between UPV, RH and compressive strength of geopolymer bricks. Different empirical formulas were proposed correlating the compressive strength of geopolymer concrete to RH, UPV and combined (SonReb) method. The validity of the empirical formulas was tested and compared with experimental relationships developed by previous researchers.

Production of lightweight concrete by using construction lightweight wastes

Jan 25, 2019

Journal Engineering and Technology Journal

publisher UOT, IRAQ

Issue 1

Volume 37

This research covers the use of cellular lightweight concrete waste as recycled coarse aggregates to produce lightweight concrete. Various volume fractions of coarse aggregate (35%, 50%, and 75%) were used. The specimens were tested for compressive strength and density at age of 28-days. The compressive strengths for the resulting lightweight concrete with a density of (2131, 1826 and 1630) kg/m3 were (24, 22.6 and 11.5) MPa, respectively. In addition, silica fume was utilized as a constant replacement ratio 6% of cement weight for mixes lightweight aggregate to enhance the compressive strength of such concrete.