Ali Nazari

Amirkabir University of Technology | TUS

The Journal Editorial Office has retracted this article because it shows significant overlap with a number of articles including those that were under consideration at the same time [1‒4]. Additionally, the article shows evidence of peer review manipulation. The Publisher has not been able to obtain a current email address for both authors.

The Journal Editorial Office has retracted this article because it shows significant overlap with a number of articles including those that were under consideration at the same time [1‒4]. Additionally, the article shows evidence of peer review manipulation. The Publisher has not been able to obtain a current email address for both authors.

The Journal Editorial Office has retracted this article because it significantly overlaps with a number of articles including those that were under consideration at the same time [1] and previously published [2–5]. Additionally, there appears to be partial image overlap between panels within Figure 7 and with other publications by the same authors...

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with number of articles including those that were under consideration at the same time [2] and previously published articles [3–6]. Additionally, the article shows evidence of peer review manipulation.

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editors-in-Chief. The article duplicates significant parts of other published papers including “The effects of CuO nanoparticles on propert...

The Editor-in-Chief has retracted this article.

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a number of articles including those that were under consideration at the same time [2] and previously published articles [3–6].

The Editor-in-Chief has retracted this article because it significantly overlaps with a number of previously published articles.

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of The Editor in Chief. This article [Prediction compressive strength of lightweight geopolymers by ANFIS] has been retracted at the request of th...

By the decision of the Editor-in-Chief, article (1) has been withdrawn from Issue 6 Volume 16 (2011) of the Cement Wapno Beton journal. The withdrawn article contains content borrowed without citation, e.g. from Jo et al. (2). The presented cement composition is iden-tical to the cement composition presented in the work of Givi et al. (3). Also, so...

By the decision of the Editor-in-Chief, article (1) has been withdrawn from Issue 3 Volume 16 (2011) of the Cement Wapno Beton journal. The withdrawn article contains content borrowed without citation, e.g. from Jo et al. (2). The presented cement composition is identical to the cement composition presented in the work of Givi et al. (3). We would...

The Editor-in-Chief has retracted this articl

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a number of articles including those that were under consideration at the same time [2–4] and previously published articles [5, 6]. Additionally, the article shows evidence of peer review manipulation. The authors have not responded to any correspondence regar...

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a number of articles including those that were under consideration at the same time [2, 3, 4] and previously published articles [5, 6]. Additionally, the article shows evidence of peer review manipulation. The authors have not responded to any correspondence r...

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a number of articles including those that were under consideration at the same time [2, 3] and previously published articles [4–6]. Additionally, the article shows evidence of peer review manipulation. The authors have not responded to any correspondence regar...

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a large number that were under consideration at the same time, including [2], and previously published articles [3–6]. Additionally, the article shows evidence of peer review manipulation. The authors have not responded to any correspondence regarding this ret...

Additionally, the article shows evidence of peer review manipulation and authorship manipulation.

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a large number of articles that were under consideration at the same time, including [2–5], and previously published articles, including [6].

The Editor-in-Chief has retracted this article [1] because it significantly overlaps with a number of articles including those that were under consideration at the same time [2–4] and previously published articles [5, 6]. Additionally, the article shows evidence of peer review manipulation. The authors have not responded to any correspondence regar...

Two main limitations of extrusion-based 3D concrete printing process are the incorporation of conventional steel bars and the limited range of printable concretes. To tackle both limitations, this paper investigates feasibility of developing a 3D-printable ductile fibre-reinforced geopolymer composite (DFRGC) for digital construction applications....

The correlation between the void structure, as a representative of bleeding behaviour, and the strength of concrete is investigated in the current article. Early age cracking, due to dry shrinkage, can negatively influence the durability of pavement structures. Also, dry shrinkage of concrete is directly proportional to the bleeding rate. Thus, mod...

Currently, there are a very limited number of studies on the effect of admixtures on properties of ‘one-part’ geopolymers. This paper reports the effects of different superplasticizers and retarders on fresh and hardened properties of one-part fly ash-slag blended geopolymers made by different solid activators. Two different grades of sodium silica...

This paper employs artificial intelligence methods in order to create a function for compressive strength of the boroaluminosilicate geopolymers based on mixture proportion variables. Boroaluminosilicate geopolymers (BASGs), a group of boron-based alkali-activated materials, not only minimise the carbon footprint in the construction industry but al...

Three-dimensional (3-D) printers have the potential to print samples that can be used as a scaffold for a variety of applications in different industries. In this paper, cement-based materials including ordinary portland cement, calcium aluminate cement (passing 150 μm [0.0059 in.] size sieve), and fine sand were investigated as the cement-based ma...

This paper reports the fresh and hardened properties of an ambient temperature cured 3D printable geopolymer suitable for extrusion-based 3D concrete printing process. Effects of several key geopolymer synthesis parameters including type of alkaline activator (sodium (Na)-based versus potassium (K)-based), mass ratio of silicate to hydroxide soluti...

This paper investigates the effect of polypropylene (PP) fibres on the fresh and hardened properties of 3D-printed fibre-reinforced geopolymer mortars. Different percentages of PP fibres ranging between 0.25% and 1.00% by volume were added to an optimised geopolymer mixture. All samples showed reasonable workability and extrudability. In addition,...

In this paper, a molecular model is proposed to investigate sorption of water molecules and chloride ions in nanopores of alkali-activated binders (geopolymer) gels. The structure of water molecule and geopolymer matrix was optimised by molecular dynamics simulation, and sorption of water molecules and chloride ions was performed by Monte Carlo app...

This paper is investigating a more environment-friendly type of alkali-activated materials so-called boroaluminosilicate geopolymer (BASG). The microstructural and thermal behaviour of boroaluminosilicate geopolymers is studied using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) respectively. The chemical bonds...

In this study, an experimental program was conducted to investigate the effect of microwave curing on the strength of geopolymer. Volumetric heating provided by microwave curing results in faster strength development as compared to conventional heat curing that depends on heat transmission from the outside to the core of a specimen. Initially, the...

Despite its negative impact on compressive strength of concrete, practitioners rely exclusively on using air entrainment to defeat freezing-and-thawing deterioration. This paper describes the use of graphene oxide (GO) as an effective method to minimize the negative impact of freezing-and-thawing action in concrete while maintaining high compressiv...

In this paper, alkali-activated fly ash (geopolymer) samples were microstructurally analysed after thermal shock. The prepared samples were heated at 1000 °C, and then quenched in water to room temperature. X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) were used to analyse the samples. The colour of the interior and exterior sec...

In this paper, the influence of boron ions on the strength development and microstructure variations of fly ash-based geopolymers and alkali-activated slag (AAS) was investigated through utilizing borax-based alkali-activators. In addition to cost-effective aspects, the substitution of boron ions in geopolymer and AAS matrixes meant to minimize the...

This paper investigates binary and ternary binders of ordinary Portland cement, metakaolin and limestone as a possible solution to reduce the amount of cement content in mortar mixes. Furthermore, the mortar mixtures were reinforced with steel fibres and their properties were investigated. The effectiveness of metakaolin and limestone on compressiv...

Geopolymers are cement-free construction materials which are produced by mixing an aluminosilicate source such as fly ash with an alkali activator. Despite their eco-friendly nature, geopolymers suffer the negative impact of the sodium silicate part of the alkali activator on the environment. The use of borax, one of the eco-friendly salts of boric...

The grain size of constrained groove pressed aluminum has been predicted through the genetic programming approach. “Sheet thickness,” “elongation,” “yield strength,” “ultimate tensile strength,” “total strain,” and “hardness,” along with “primary grain size” of the ultrafine-grained sheets were utilized as input parameters to obtain the ultimate gr...

The research objectives were designed to investigate polyacrylamide superabsorbent polymers as internal curing agent to mitigate autogenous shrinkage of well cement. Results show that poly acrylamide superabsorbent polymer hydrolyzes in alkaline circumstance of cement slurry at high temperature, which causes water absorption increase and then has n...

The research objectives in this paper are designed to use gypsum microsphere to achieve low elastic modulus and expansive well cement system. Results show that gypsum microsphere has the ability to compensate for volume shrinkage of hardened cement. Expansive crystals produced by the reaction of tricalcium aluminate and dihydrate gypsum exist aroun...

Fly ash sourced from Sarawak, Borneo was alkali-activated by a combination of alkali hydroxides (i.e. NaOH, KOH or Ca(OH)2) and sodium silicate (i.e. industrial or commercial grade Na2SiO3) in this research. A comprehensive overview of the compressive strength of geopolymer due to different alkali activator/fly ash and Na2SiO3/NaOH (Na2SiO3/KOH or...

Two types of fly ash sourced from Sarawak, Malaysia and Gladstone, Australia reflect differences in chemical compositions, mineral phase and particle size distributions. In this paper, the Sarawak fly ash was used to produce geopolymer in comparison to the well-developed Gladstone fly ash-based geopolymer. Characteristics of fly ash and mixtures pr...

The fluid loss of modified aluminate phosphate cement system with excellent CO2 resistant ability cannot meet the demand of cementing engineering and the conventional fluid loss additive lose effectiveness in this cement system. The aim of this paper is to reveal the failure mechanisms of the conventional fluid loss additive and develop one kind of...

The research objectives are designed to realize the application of superabsorbent polymer (SAP) in well cement to plug microcrack. Gypsum-chitosan-gypsum coated SAP is proposed. Percolation theory is used to research plugging microcrack mechanism. According to the exact analytical solution of square plane percolation threshold, dosage threshold of...

The research objectives of this article consist of development of appropriate apparatus and process to apply natural sedimentation for preparing polyacrylamide microspheres industrially. The kettle height of the apparatus should be more than 2m to provide adequate sedimentation distance for microspheres, and the inner wall of kettle was made of non...

In this paper, the effect of different factors including mixture proportions and curing conditions on compressive strength of fly ash-based geopolymers was studied. Several parameters were used to construct a predictive model based on genetic programming, which deliver the compressive strength of specimens with reasonable accuracy. A parametric stu...

Offshore pipeline is generally recognised to be the safest and most economical way to transport oil and gas. These pipelines are operated in elevated temperatures and pressures those are much higher than the ambient conditions. That will causes axial expansion in the pipeline, if such expansion is restrained by soil friction, the compressive force...

Fracture stress, strain pattern distribution and Young’s modulus of chemically graded geopolymer (GFC) specimens were modelled analytically. GFC specimens were fabricated via sequential pouring of two different alkali-activated fly ash mixtures into the moulds. Diffusion of constituent materials of the mixtures into each other prior to hardening ca...

Aluminium and grey cast iron slags are produced in small industries and in spite of blastfurnace slag are considered as wastes. In this work, synthesis possibility of geopolymeric paste and concrete through alkali activation of different mixes of these slags is studied. Workability of the mixtures was achieved immediately after mixing and compressi...

In this study, fracture toughness of steel fibre-reinforced aluminosilicate geopolymers is investigated experimentally and is modelled by explicit finite element method. Nine geopolymeric pastes with various alkali activators to fly ash weight ratios, sodium hydroxide (NaOH) to sodium silicate weight ratios, NaOH concentrations and curing temperatu...

To date, many artificial intelligence-based techniques have been conducted to predict compressive strength of concrete specimens. However, modified models by metaheuristic optimization algorithms to present approaches with higher performance may be of special interest. In this work, support vector machine (SVM) is utilized to predict compressive st...

In this paper, a functionally graded solution is proposed for stress distribution in functionally graded geopolymers under flexural loading with the load direction parallel to the gradient direction. Functionally graded geopolymer specimen is made by sequential pouring and subsequent vibration of two different mixtures of alkali activated pastes in...

Geopolymers are cement-free constructional materials and for their production much lower greenhouse gases are emitted than traditional concrete. In this study, compressive strength of geopolymers was related to their degree of geopolymeric reactions. Then, the Johnson–Mehl–Avrami–Kolmogorov equation was applied to represent compressive strength evo...

Functionally graded aluminum matrix composites (FGAMC) are new advanced materials with promising applications due to their unique characteristics in which composite nature is combined with graded structure. Different architectures of Al6061/SiC p composite laminates were fabricated by successive hot roll-bonding. For FGAMCs, two composite layers as...

Compressive strength of geopolymeric specimens produced by class C fly ash and granulated blast furnace slag aggregates has been studied. Four different independent factors comprising of aggregate content, sodium hydroxide concentration, curing time and curing temperature were considered as the variables. To attain the maximum possible accurate res...

In constrained groove pressing (CGP), imposing repetitive shear plastic deformation improves considerably sheet mechanical properties along with decreasing grain size. The final grain size of CGPed aluminum sheets has been predicted by gene expression programming (GEP). Thickness, total strain, hardness, elongation, yield and ultimate tensile stren...

In the present work, the effect of SiO2 and Al2O3 nanoparticles on compressive strength of ash-based geopolymers with different mixtures of rice husk ash, fly ash, nanoalumina and nanosilica has been predicted by gene expression programming. The models were constructed by 12 input parameters, namely the water curing time, the rice husk ash content,...

Gas tungsten arc welding of CK45 and AISI304 stainless steel was performed through preparation of different types of samples using ER308L and ERNi-1 wires. Welded samples were studied by different techniques including optical metallography, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction,...

Charpy impact energy of the produced Al6061–SiCp laminated nanocomposites by mechanical alloying was modeled by adaptive neuro-fuzzy interfacial systems (ANFIS) in both crack divider and crack arrester configurations. The model was constructed by training, validating and testing of 171 gathered input–target data. The thickness of layers, the number...

The paper presents some results of the research connected with the development of new approach based on the Adaptive Network-based Fuzzy Inference Systems (ANFIS) of predicting the Vickers microhardness of the phase constituents occurring in five steel samples after continuous cooling. The independent variables in the model are chemical composition...

A duplex surface treatment on DIN 1.2210 steel has been developed involving nitriding and followed by chro-mium thermo-reactive deposition (TRD) techniques. The TRD process was performed in molten salt bath at 550, 625 and 700 °C for 1–14 h. The process formed a thickness up to 9.5 μm of chromium carbonitride coat-ings on a hardened diffusion zone....

In the present study, the Vickers microhardness profile of ferritic and austenitic functionally graded steel produced by electroslag remelting process has been modeled by adaptive network-based fuzzy inference system (ANFIS). To produce functionally graded steels, a spot-welded electrode that consists of two slices of plain carbon steel and austeni...

In the present work, compressive strength of geopolymers produced by ordinary Portland cement, seashell powder and different alkali activators was predicted by gene expression programming design code. For constructing the models, 8 input parameters including the concentration of alkali solution, alkali binder to alkali solution weight ratio, alkali...

Gene expression programming (GEP) optimization tool has been utilized to predict the mean grain size of nanopowders synthesized by mechanical alloying. 86 data were collected from the literature, randomly divided into 65 and 21 sets and then, respectively, were trained and tested by 11 different GEP models. The differences between the models were i...

In the present study, the Charpy impact energy of ferritic and austenitic functionally graded steel produced by electroslag remelting has been modeled in crack divider configuration. To produce functionally graded steels, two slices of plain carbon steel and austenitic stainless steels were spot welded and used as electroslag remelting electrode. F...

In the present work, compressive strength of geopolymers made from seeded fly ash and rice husk–bark ash has been predicted by adaptive network-based fuzzy inference systems (ANFIS). Different specimens, made from a mixture of fly ash and rice husk–bark ash in fine and coarse forms and a mixture of water glass and NaOH mixture as alkali activator,...

In the present work, total specific pore volume of inorganic polymers (geopolymers) made from seeded fly ash and rice husk bark ash has been predicted by artificial neural networks. Different specimens were subjected to porosimetry tests at 7 and 28 days of curing. One set of the specimens were cured at room temperature until reaching to 7 and 28 d...

In the present work, compressive strength of ash-based geopolymers with different mixtures of % rice husk ash, fly ash, nano alumina and nano silica has been predicted by fuzzy logic. The alkali activating was done by a mixture of sodium hydroxide and sodium silicate solution. It was found that oven curing temperature and sodium hydroxide concentra...

In the present study, compressive strength results of geopolymers produced by ordinary Portland cement (OPC) as aluminosilicate source has been modeled by gene expression programming. Six main factors including NaOH concentration, water glass to NaOH weight ratio, alkali activator to cement weight ratio, oven curing temperature, oven curing time an...

The final microstructure and resulting mechanical properties in the linepipe steels are predominantly determined by austenite decomposition during cooling after thermomechanical and welding processes. The paper presents some results of the research connected with the development of a new approach based on the artificial neural network to predicting...

In this study, the Vickers microhardness profile of ferritic and austenitic functionally graded steel produced by electroslag remelting process has been modeled by artificial neural networks. To produce functionally graded steels, two slices of plain carbon steel and austenitic stainless steels were spot-welded and used as electroslag remelting ele...

In the present work, percentage of water absorption of geopolymers made from seeded fly ash and rice husk bark ash has been predicted by artificial neural networks. Different specimens, made from a mixture of fly ash and rice husk bark ash in fine and coarse form together with alkali activator made of water glass and NaOH solution, were subjected t...

In the present work, compressive strength of inorganic polymers (geopolymers) made from seeded fly ash and rice husk–bark ash has been predicted by gene expression programming. Different specimens were subjected to compressive strength tests at 7 and 28 days of curing. One set of the specimens were cured at room temperature until reaching to 7 and...

In the present paper, two models based on artificial neural networks and genetic programming for predicting split tensile strength and percentage of water absorption of concretes containing Al2O3 nanoparticles have been developed at different ages of curing. For purpose of building these models, training and testing using experimental results for 1...

In the present study, Taguchi method was utilized to design compressive strength tests of geopolymers produced by Portland cement as aluminosilicate source. Six main factors including NaOH concentration, water glass to NaOH weight ratio, alkali activator to cement weight ratio, oven curing temperature, oven curing time and water curing regime each...

In the present study, compressive strength of lightweight aluminosilicate geopolymers produced by fine fly ash and rice husk bark ash together with palm oil clinker (POC) aggregates has been modeled by gene expression programming. To build the model, training and testing by using experimental results from 144 specimens were conducted. The used data...

In the present work, water absorption of lightweight geopolymers produced by fine fly ash, rice husk bark ash and palm oil clinker (POC) aggregates has been modeled based on artificial neural networks. To build the models, training, validating and testing using experimental results from 144 specimens were conducted. The data used in the multilayer...

In this study, strength assessments and coefficient of water absorption of high-performance self-compacting concrete containing different amounts of SnO2 nanoparticles have been investigated. The results indicate that the strength and the resistance to water permeability of the specimens are improved by adding SnO2 nanoparticles in the cement paste...

In this work, Charpy impact energy of Al6061-SiCp nanocomposites produced by mechanical alloying has been modeled by artificial neural networks in both crack divider and crack arrester configurations. Al6061 powders were mixed by 2, 3, and 5 vol % of SiC nanoparticles and ball-milled for 45 min. Afterward, the produced powders were hot-pressed in a...

In the present work, compressive strength of lightweight inorganic polymers (geopolymers) produced by fine fly ash and rice husk–bark ash together with palm oil clinker (POC) aggregates has been investigated experimentally and modeled based on fuzzy logic. To build the model, training, validating and testing were conducted using experimental result...

In the present work, total specific pore volume of inorganic polymers (geopolymers) made from seeded fly ash and rice husk–bark ash has been predicted by gene expression programming. To build the model, training and testing using experimental results from 120 specimens were conducted. The values for input layers were the percentage of fine fly ash...

In the present work, compressive strength of ash based geopolymers containing 97 wt% rice husk ash + fly ash and 3 wt% nano alumina + nano silica has been designed by Taguchi method at 2 and 7 days of water curing. 4 factors including the percentage of nano silica (at 3 levels of 1, 2 and 3 wt%), oven curing temperature (at 3 levels of 25, 70 and 9...

In the present work, compressive strength of lightweight inorganic polymers (geopolymers) produced by fine fly ash and rice husk bark ash together with palm oil clinker (POC) aggregates has been investigated experimentally and modeled based on adaptive network-based fuzzy inference systems (ANFIS). Different specimens made from a mixture of fine fl...

In the present work, water absorption of lightweight geopolymers produced by fine fly ash and rice husk bark ash together with palm oil clinker (POC) aggregates has been investigated experimentally and modeled by fuzzy logic. Different specimens made from a mixture of fine fly ash and rice husk bark ash with and without POC were subjected to water...

In the present work, compressive strength of inorganic polymers (geopolymers) made from seeded fly ash and rice husk bark ash has been predicted by artificial neural networks. Different specimens were subjected to compressive strength tests at 7 and 28 days of curing. One set of the specimens were cured at room temperature until reaching to 7 and 2...

In this research, a method has been presented to predict the science production share of the Islamic Azad University in Iran at the end of 2017 and 2025 by artificial neural networks and adaptive network-based fuzzy inference systems. The used data were scientific publications under affiliations entitled “Azad University” or “University of Azad” ga...