Haleh RasekhUniversity of Technology Sydney | UTS · School of Civil and Environmental Engineering
Haleh Rasekh
UTS, BSc (Eng), MPhil, PhD
Looking for potential collaborations in Concrete Materials & Technology, Rock Mechanics Eng., Geotech Eng.
About
46
Publications
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784
Citations
Citations since 2017
Introduction
Additional affiliations
April 2014 - August 2017
March 2012 - present
Publications
Publications (46)
![Properties of Ferrogard 901 inhibitor [3].](publication/369260442/figure/tbl2/AS:11431281127051911@1678903367944/Properties-of-Ferrogard-901-inhibitor-3_Q320.jpg)
In this research, methods of increasing the corrosion resistance of reinforced concrete were experimentally investigated. The study used silica fume and fly ash at optimized percentages of 10 and 25% by cement weight, polypropylene fibers at a ratio of 2.5% by volume of concrete, and a commercial corrosion inhibitor, 2-dimethylaminoethanol (Ferroga...
In this study, the tensile strength, failure mechanism and ductile behavior of geo-grid reinforced high strength self-compacting concrete discs subjected to botch of the Brazilian tensile strength test and Biaxial compressive test are studied. To determine the combined effects of geo-grid layer numbers and inclination angle on the ultimate tensile...
Jointed rock specimens with planar, sawtooth and natural replicated joint types with a dip angle of 60° were prepared, and a series of cyclic triaxial tests were performed at different confining pressures and cyclic deviatoric stress amplitudes subjected to 10,000 loading cycles to evaluate their effect on dynamic properties of the jointed rock spe...
This paper investigates the influence of concrete/gypsum bedding layers and their orientation angles on the tensile failure mechanism in the three-point bending test based on experiments and numerical simulations. Rectangular samples containing different combinations of concrete and gypsum layers were prepared, i.e. one layer of gypsum and one laye...
The mechanical behavior of cubic gypsum specimens containing five small circular holes in a linear configuration and a single notch under uniaxial compression test were studied to evaluate interactions between these flaws during crack development under loading. Multiple angles between the line of holes and the horizontal axis were evaluated (15°, 4...
Lime-cement concrete (LCC) is a non-structural concrete in which lime and cement are used as the main binders. However, although LCC has many applications in reducing the settlement of foundations and providing a support layer for shallow foundations, little research has been conducted to evaluate its behaviour in various moisture conditions. Previ...
This paper presents a comprehensive evaluation on self-compacting (SC) mortars incorporating 0, 1, 3, and 5% alumina nanoparticles (NA) as well as 0% and 30% rice husk ash (RHA) used as Portland cement replacement. To evaluate the workability, mechanical, and durability performance of SC mortars incorporating NA and RHA, the fresh properties (slump...
Electrokinetic (EK) treatment is an effective method in accelerating the consolidation and improving the geotechnical properties of fine-grained soils. This method stabilizes the soil and increases the bearing capacity of piles by improving the soil shear strength. Changing the soil pH, due to the occurrence of chemical reactions of electrolysis in...
This experimental study investigated the compressive behavior of lightweight concrete after exposure to elevated temperatures. In total, 240 samples from 30 different mixtures were prepared and tested to evaluate the compressive strength, elastic modulus, strain at peak stress, and stress–strain relationships of lightweight aggregate concrete (LWAC...
Construction activities have been a primary cause for depleting natural resources and are associated with stern environmental impact. Developing concrete mixture designs that meet project specifications is time-consuming, costly, and requires many trial batches and destructive tests that lead to material wastage. Computational intelligence can offe...
Pervious concrete (PC) has been widely used to construct concrete pavements and to increase the permeable surfaces all over the world. With the boost in the use of PC, it is necessary to make it more environmental-friendly and cost efficient. This study investigates employing recycled concrete aggregate (RCA) and pozzolanic additives as a partial r...
Corrosion of steel rebars in concrete can reduce the durability of concrete structures in coastal environments. The corrosion rate of these concrete structures can be reduced by using suitable concrete additives and coating on rebars. This paper investigates the corrosion resistance of steel rebars by the addition of pozzolanic materials including...
The aim of this study is to investigate the effects of using recycled concrete aggregate (RCA) and pozzolanic materials as a partial replacement of natural coarse aggregate (NCA) and cement, respectively, on the mechanical and permeability properties of fiber-reinforced pervious concrete mixes. For this purpose, mixes were prepared with 25%, 50%, 7...
To date, the electrokinetic (EK) method has only been used to increase the bearing ca-pacity of steel piles. This study analysed the impact of EK on the bearing capacity of rein-forced cement concrete piles (RCCP), reinforced lime-cement concrete piles (RLCCP), and steel piles (SP) located in kaolin clay. The performance of four different cathodes...
ACI 237 Committee report (2007) defines the self-compacting concrete (SCC) as the “…highly flowable, non-segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation” (ACI 237R-07, 2007). Due to the ease of concrete casting in heavily reinforced and complicated access are...
The study researched the effectiveness of four polymer admixtures (3%, 5%, 10%, and 15% of water weight) on the fresh and hardened properties of self-compacting concrete (SCC) cast using recycled and natural aggregates. Results show that polymer additives had positive effects on the fresh properties of SCC using recycled aggregates. Incorporating p...
The unique fresh and hardened properties of high-performance self-consolidating concrete (HPSCC) lead to an extensive application of this mixture in high-rise buildings. In this paper, the elevated temperature resistivity of 19 HPSCC mixtures incorporating binary and ternary blends of fly ash, silica fume, natural zeolite, and metakaolin was invest...
A set of single shear tests on fully encapsulated cable bolts was carried out using a newly developed and integrated Megabolt single shear apparatus. The instrument is designed to determine the pure shear strength of cable bolts where there is no contact between the host body faces during the shearing process. Eight different types of cable bolt we...
There is an increasing need to determine accurately the strength properties of tendons for an effective ground control on mines and underground structures as well as on modelling simulations. The strength properties of cables, used as cable bolts, have been evaluated mainly by their ultimate tensile strength, as this kind of test can be carried out...
For several cable bolt technology has been used for ground reinforcement in civil, mining and other construction projects. The strength properties of these cables, used as cable bolts, have been evaluated mainly by their ultimate tensile strength as this kind of test could be carried out in the field as well as in the laboratory. Only recently ther...
A new series of double shear tests were carried out using a newly modified double shear apparatus which prevented contacts between concrete block surfaces during shearing. 13 double shear tests were carried out using 21mm diameter 19 (9 × 9 × 1) seal construction wire strand cable (also called Superstrand cable), Plain SUMO, Indented SUMO, Spiral M...
A newly developed double shear apparatus without contact between concrete blocks was developed to conduct a series of double shear tests. This new double shear apparatus is capable of determining the pure shear strength of pre-tensioned fully grouted cable bolt without friction between sheared concrete blocks. Five different types of cable bolt, wi...
The application of cable bolts as a secondary support system is an increasing trend in underground coal mines worldwide. The performances of cable bolts have been evaluated under both axial and shear loading conditions. Two methods of testing cables for shear, single and double shear, have been recognised. This paper examines the shear behaviour of...
Sixteen single shear tests were carried out on eight geometric cable variations provided for testing from Australian suppliers – Jennmar, Megabolt and Minova. Each test was subjected to varying pre-tension values of zero and 15 tonnes, exploring the effect of plain, spiral, bulbed, indented and a combination of plain and indented wire strands. The...
A new series of double shear tests were carried out using a newly modified double shear apparatus which prevented contacts between concrete block surfaces during shearing. 13 double shear tests were carried out using 21 mm diameter 19 (9x9x1) seal construction wire strand cable (also called Superstrand cable), Plain SUMO, Indented SUMO, Spiral MW9...
The application of cable bolts for ground support is increasing in underground coal mines worldwide. Currently,
two methods of evaluating the performance of the cable bolt are favoured: the short encapsulation pull test, and
the shear test. The former method can be used both in the laboratory and in the field while the latter can be
undertaken main...
This research concerns the delivery of sustainable building projects. These projects are defined as those which either attempt to achieve green ratings or are claimed to address certain sustainability issues. A key focus is to examine how the client's vision for sustainability is achieved or compromised by the practicality of construction. Two sust...
A mathematical model which is able to determine the pure shear strength of cable bolt was
introduced and calibrated for various conditions. The proposed equation is developed based on the
Fourier series concept and a linear relationship between shear and normal forces generated during
cable bolt shearing. The conventional double shearing instrument...
The load transfer mechanisms of cable bolts differ from normal rebar bolts. Cable bolts
used in mines are basically steel strands with different constructions depending on the number of wires
or elements and the way that these elements are laid. Tendon bolts (rebar and cable) are normally
evaluated for strength and load transfer properties. The str...
The strength properties of Secura Hollow Groutable Cable-bolts (HGC) were examined for
tensile and shear failures. The 30 mm diameter, nine strand, cable bolt consisted of a mixture of five 7.5
mm plain and four 7.0 mm indented strands wrapped around a central 14 mm steel grouting hole to
make a round cable with lay length of 500 mm with bulbs at 5...
The strength properties of Secura Hollow Groutable Cable-bolts (HGC) were examined for tensile and shear failures. The 30 mm diameter, nine strand, cable bolt consisted of a mixture of five 7.5 mm plain and four 7.0 mm indented strands wrapped around a central 14 mm steel grouting hole to make a round cable with lay length of 500 mm with bulbs at 5...
Cable bolting and rock/rebar bolting are the two main reinforcement techniques used in underground coal mines to maintain the stability of openings. Due to the structural features of cable strands, cables and solid bolts behave differently in reinforcing rock strata. Since the generation of a cable model is different in a numerical program, and esp...
Glass-Reinforced Polymer (GRP) bolts, commonly known as Fibre Glass (FG) dowels and Fibre–Reinforced polymer (FRP) or plastic bolts or plastic dowels are increasingly applied for strata reinforcement in mines as well as in concrete reinforcement in civil engineering. The most popular dowels used in coal mines are the 22 mm diameter fully threaded t...
Effects of shearing direction on shear behaviour of rock joints were studied. Artificial
triangular asperities with initial asperity angles of 9.5° (Type I) and 18.5° (Type II), inclined at 0°, 30°,
and 60° from the direction perpendicular to the shearing movement were cast using high strength
gypsum plaster. Samples were tested at different initia...
![Figure 6: Shear behaviour of cabled concrete [test 1]](profile/Haleh-Rasekh/publication/274136854/figure/fig2/AS:669419558678534@1536613468529/Shear-behaviour-of-cabled-concrete-test-1_Q320.jpg)
The application of cable bolts for ground support is on the increase in underground coal mines worldwide. Currently, two methods of evaluating the performance of the cable bolt are favoured; the short encapsulation pull test and shear test. The former method can be used both in the laboratory and the field, while the latter can be undertaken mainly...
Projects
Projects (2)
Dear Colleagues,
This Special Issue is devoted to the application of novel hybrid intelligence technologies in various engineering research fields. Artificial intelligence techniques perform automatic creation of analytical models that recognize patterns and make decisions without human interventions. Such techniques, due to creating complex relationships between dependent and independent variables, can be implemented in different areas of engineering. The successful use of base artificial intelligence techniques for solving regression, classification, and time series problems is highlighted in various engineering fields. However, the aforementioned base models may include some important shortcomings and disadvantages. To overcome these shortcomings and receive a higher accuracy level, hyper-parameters of the base models can be optimized using optimization and metaheuristic algorithms, which can add more value to commonly used base intelligence techniques and help them to become more interesting and practical.
The focus of this Special Issue is on the development of novel hybrid intelligence techniques for solving regression, classification, and time series problems. We invite researchers to contribute original research articles that will stimulate the continuing research effort on applications of novel hybrid intelligence techniques to assess/solve engineering problems. In addition, state-of-the-art research reports, reviews, and critical evaluations of hybrid intelligence techniques/algorithms are most welcome.
Dr. Danial Jahed Armaghani
Dr. Yixia Zhang
Dr. Pijush Samui
Prof. Dr. Ahmed Hussein Kamel Ahmed Elshafie
Dr. Aydin Azizi
Guest Editors
For more information, visit our website:
https://www.mdpi.com/journal/applsci/special_issues/Intelligence_Techniques_Engineering
