Ali Reza Ghanizadeh

Sirjan University of Technology · Department of Civil Engineering

Test protocols commonly recommend measuring resilient modulus (Mr) of asphalt mixtures by applying a haversine waveform with a loading time (duration) of 0.1 s and a rest period of 0.9 s. These conditions may not necessarily simulate the actual loading history experienced by an asphalt layer in the field. This paper aims to investigate the effects...

Fatigue life of asphalt mixes in laboratory tests is commonly determined by applying a haversine or sinusoidal load with a specific frequency. However, the frequency (time duration) and shape of horizontal tensile stress and strain pulses at the bottom the asphalt layer depend on pavement design (thickness and stiffness of layers) and loading speci...

Pavement construction is one of the most costly parts of transportation infrastructures. Incommensurate design and construction of pavements, in addition to the loss of the initial investment, would impose indirect costs to the road users and reduce road safety. This paper aims to propose an optimization model to determine the optimal configuration...

Fatigue is one of two major performance issues in flexible pavements that caused by repeated traffic loading. There are several methods for determination of fatigue life like 50% stiffness reduction (AASHTO), energy-based methods, and fracture mechanics. The primary objective of this study is exploring the effect of choosing different methods to de...

New trend in design of flexible pavements is mechanistic-empirical approach. The first step for applying this method is analyzing the pavement structure for several times and computation of critical stresses and strains, which needs a fast analysis method with good accuracy. This paper aims to introduce a new rapid pavement analysis approach, which...

The quality of granular base materials plays a key role in the enhanced performance of Inverted Pavement Systems (IPS). Typically, premium quality materials are required for construction of IPS structures. This study investigates the feasibility of geocell reinforcing of lower quality materials to be used as an alternative when premium base materia...

Lime Stabilization is one of the common methods to increase the bearing capacity and reduce deformation of weak subgrade soils. Considering the increase in the bearing capacity of the subgrade soil after lime stabilization, it is important to determine the effect of lime stabilization on the pavement life extending from the perspective of pavement...

Because of the complicated geometry and a lack of knowledge about the parameters that impact it, estimating the ultimate bearing capacity (qrs) of a geogrid-reinforced sandy bed on vertical stone columns in soft clay is challenging. In practical applications, developing an accurate prediction model can be beneficial due to the difficulty and expens...

Resilient modulus (Mr) of subgrade soils is considered as one of the most important factors for designing flexible pavements using empirical methods as well as mechanistic-empirical methods. The resilient modulus is commonly measured by a dynamic triaxial loading test, which is complex and expensive. In this research, back-propagation artificial ne...

The collapse settlement of granular soil, which brings about considerable deformations, is an important issue in geotechnical engineering. Several factors are involved in this phenomenon, which makes it difficult to predict. The present study aimed to develop a model to predict the collapse settlement and coefficient of stress release of sandy grav...

In the 1993 AASHTO flexible pavement design equation, the structural number (SN) cannot be calculated explicitly based on other input parameters. Therefore, in order to calculate the SN, it is necessary to approximate the relationship using the iterative approach or using the design chart. The use of design chart reduces the accuracy of calculation...

This research aim is to develop a procedure for backcalculation of flexible pavements moduli based on the hybridization of the Artificial Neural Network (ANN) and the Jaya optimization algorithm. The ANN was applied to predict the pavement deflection basin, and the Jaya was employed for moduli backcalculation. The comparison of hybrid ANN-Jaya proc...

In this research, the capability of vermiculite in arsenic extraction, associated with characterizing its main properties was evaluated. To address this purpose, vermiculite was artificially contaminated with arsenic at 7 and 28-day intervals. Then, arsenic was extracted from contaminated soils by different extractants. Various physical and mechani...

In this study, the evolutionary polynomial regression (EPR) method has been employed to develop simple models with reasonable accuracy to predict the compressive strength and Young's modulus of the lime/cement stabilized clayey subgrade soil. For this purpose, the different specimens with the various cement and lime contents, at three moisture cont...

هدف از تأليف كتاب حاضر فراهم نمودن مجموعه‌اي جامع از آزمايش‌هاي متداول خاك، قير، آسفالت و بتن است. هر آزمايش در بخش‌هاي مختلف شامل هدف، اصول كلي، مراجع، تجهيزات موردنیاز، روند انجام آزمايش، محاسبات، گزارش آزمايش و كاربرگ آزمايش تشريح شده است و سعي شده است تا آزمايش‌ها به‌سادگی و به‌اختصار و درعین‌حال به‌صورت كامل تشريح شوند. كتاب حاضر مي‌تواند به‌ع...

The resilient modulus (MR) of road materials is one of the most important parameters in the analysis and design of pavement. This parameter is used in both empirical methods and mechanistic-empirical methods as the main parameter for expressing the stiffness and behavior of road construction materials. To determine this parameter in the laboratory,...

Pavement performance prediction is a mounting task due to the many varied influencing factors particularly aging which varies with time, weather, production, type of pavement and etc. This paper presents a conventional mathematical model named Superpave model, Artificial Neural Network (ANN), and Supporting Vector Machine (SVM) techniques to predic...

The resilient modulus of different pavement materials is one of the most important parameters for the pavement design using the mechanistic-empirical (M-E) method. The resilient modulus is generally determined by a triaxial test, which is expensive and time-consuming and requires special laboratory facilities. This study aims to develop a model bas...

In this study, a new numerical method based on the combination of High Exploration Particle Swarm Optimization (HEPSO) and Moving Least Squares (MLS) is introduced to solve nonlinear porous media equations. The MLS scheme is employed to describe an appropriate discretized function, and the penalty method is implemented to convert the constrained pr...

Concrete is extensively used in the construction industry. To reduce the production of cement and subsequently reduce air pollution due to the release of gas into the atmosphere and also to increase the strength of concrete, cement additives can be used. One of the additives that can be used in concrete is biochar from agricultural waste during the...

This paper aims to evaluate the full-depth reclamation (FDR) technique for the improvement of urban streets in the city of Sirjan from a technical standpoint. Also, experimental results of soil-reclaimed asphalt pavement (RAP) blend stabilized with Portland cement has been represented. The experimental program of this research includes two phases....

The casting process creates a significant amount of waste foundry sand (WFS). Using WFS as a concrete ingredient reduces the problems associated with the dumping process of these types of wastes, removes/reduces carbon dioxide, and is also considered economical in terms of overall concrete production cost. Besides, WFS has been reported to be a cri...

The full-depth reclamation (FDR) layer is a mixture of coarse aggregates and reclaimed asphalt pavement (RAP) which is stabilized by a stabilizer agent. In order to design and quality control of FDR materials, the unconfined compressive strength (UCS) of stabilized material commonly be used. This research aims to develop a machine learning model for...

The primary objective of this research was to develop a model to accurately predict the modulus of flexible pavement layers from surface deflections measured using the falling weight deflectometer (FWD) device. To do so, a synthetic dataset consisting of 10,000 flexible pavements was created using the layered elastic theory. The developed dataset c...

The use of clays, especially bentonite clays in composites, is one of the practical and cost-effective ways for engineers to absorb heavy metals. On the other hand, automatically obtained mechanical properties of these composites, especially plastic concrete (PC) made by adding bentonite clay to the ordinary concrete mixture, can be useful in reduc...

Design of vertical alignment with minimum earthwork cost can effectively reduce the construction costs of highways. In most past researches, the objective function has been considered as the sum of the absolute value of difference between the vertical alignment and the existing ground and due to the complexity of earthwork calculation, real costs o...

Rutting is among the most important distresses in flexible pavements, which is mainly influenced by asphalt mixes properties at high temperatures. There are different methods for measuring the rutting resistance of asphalt mixes. Flow number of asphalt mix, which is measured experimentally by dynamic creep test is one of the most commonly used rutt...

The main purpose of this work is the comparison of several objective functions for optimization of the vertical alignment. To this end, after formulation of optimum vertical alignment problem based on different constraints, the objective function was considered as four forms including: 1) the sum of the absolute value of variance between the vertic...

Utilizing fine-grained soils containing clay minerals in most of the structures due to the specific surface area, ion exchange capacity and high adsorption capacity of hazardous contaminants have always been considered with the geotechnical view of the environment. In this study, the effect of contamination and stabilization of anionic pollutants (...

Rutting is one of the major distresses in the flexible pavements, which is heavily influenced by the asphalt mixtures properties at high temperatures. There are several methods for the characterization of the rutting resistance of asphalt mixtures. Flow number is one of the most important parameters that can be used for the evaluation of rutting. T...

Dispersivity of clay soils is one of the most important issues that should be considered in civil engineering projects. Dispersive soils are clay soils that are easily washed in water with low concentrations of salt; these clay soils usually contain high levels of sodium ions in their adsorption cation sites. Kaolin, sepiolite (fibrous clay), and b...

Due to the economic and environmental issues, utilization of mineral wastes, e.g. iron ore mine tailing (IOMT), as road materials can be recommended as a sustainable alternative. In the present work, the mechanical properties as well as the resistance to freezing and thawing (F-T) cycles of low plasticity clay soil stabilized with different percent...

مدول برجهندگی مصالح راهخسازي ازجمله پارامترهای بسیار مهم در تحلیل و طراحی روسازی‌ است. این پارامتر هم در روش‌های تجربی (مانند اشتو 1993) و هم در روش‌های مکانیستیک-تجربی (مانند MEPDG) به‌عنوان اصلی‌ترین پارامتر برای بیان مقاومت و خصوصیات مکانیکی مصالح راهسازي مورداستفاده قرار می‌گیرد. برای تعیین این پارامتر نیاز است تا آزمایش بارگذاری سه محوری دینام...

ازجمله روش‌های بهسازي خاک‌های کم مقاومت و مسئله‌دار در راه‌سازی، تثبیت خاک است. از طرفي بهره‌گیری از ضايعات معدني ازجمله باطله سنگ‌آهن در مصالح ساختماني به دلايل زیست‌محیطی و اقتصادي در چند سال اخير مدنظر قرارگرفته است. هدف از اين تحقيق توسعه مدلي به‌منظور پيش‌بيني مقاومت فشاري بسترهاي رسي تثبیت‌شده با آهك شكفته و باطله سنگ‌آهن است. تثبیت خاک رس سر...

هدف از انجام اين تحقيق، ارائه يك مدلي رياضي به‌منظور مدل‌سازی پیوسته کاسه نشست روسازی با استفاده از داده‌های افت‌وخیز سطح روسازی و تعيين موقعيت بهينه افت‌وخیز سنج‌هاي مربوط به دستگاه افت‌وخیز سنج ضربه‌اي است. براي اين منظور 10000 مقطع روسازی انعطاف‌پذیر مختلف با استفاده از نظريه ارتجاعي چندلایه‌ای تحليل و سپس پايگاه داده مربوط به مقادير مدول برجهند...

Utilizing bentonite in composites such as concrete mixture is one of the practical approaches for adsorption of heavy metals. The mixture of bentonite and normal concrete is known as bentonite plastic concrete (BPC). This type of concrete is commonly utilized as the material of cutoff walls under earth dams with the aim of minimizing or preventing...

The recycled layer in full-depth reclamation (FDR) method is a mixture of coarse aggregates and reclaimed asphalt pavement (RAP) which is stabilized by a stabilizer agent. For design and quality control of the final product in FDR method, the unconfined compressive strength of stabilized material should be known. This paper aims to develop a mathem...

Plastic concrete is an engineering material, which is commonly used for construction of cut-off walls to prevent water seepage under the dam. This type of concrete shows great promise to satisfy the requirements of the strength, stiffness and permeability for remedial cut-off wall construction. This paper aims to explore three hybrid machine learni...

Plastic concrete is an engineering material, which is commonly used for construction of cut-off walls to prevent water seepage under the dam. This paper aims to explore two machine learning algorithms including artificial neural network (ANN) and support vector machine (SVM) to predict the compressive strength of bentonite/sepiolite plastic concret...

Unconfined Compressive Strength (UCS) test is commonly employed to determine the strength and quality control of the stabilized layers. This method is time consuming due to the needed time for curing of samples. Also, this method can be costly if the number of samples is increased. In this paper, the group method of data handling (GMDH) was used to...

Cement is a critical material for urbanization and its production is responsible for most of the CO 2 emissions in the world. The use of substances capable of substituting the material responsible for greenhouse gases can reduce global warming, which is caused by the emission of greenhouse gases into the atmosphere , especially CO 2. Among such mat...

In road design, pavement has detailed design and its cost is inevitable. But, in the infrastructure, the costs can be considerably reduced by optimizing the position of vertical alignment. One of the most expensive parts of the infrastructure is earthwork costs, which is highly dependent on the project vertical alignment. Therefore, the aim of this...

One method for improvement of distressed pavements is full-depth reclamation (FDR). In this technology, the present asphalt layer is pulverized and mixed with the aggregate layer beneath it and then the mixture is stabilized using a stabilizer agents such as Portland cement in order to increase the strength parameters of the mixture. The aim of thi...

Reclaimed asphalt pavement (RAP) is one of the waste materials that highway agencies promote to use in new construction or rehabilitation of highways pavement. Since the use of RAP can affect the resilient modulus and other structural properties of flexible pavement layers, this paper aims to employ two different artificial neural network (ANN) mod...

One of the most important factors that affects construction costs of highways is the earthwork cost. On the other hand, the earthwork cost strongly depends on the design of vertical alignment or project line. In this study, at first, the problem of vertical alignment optimization was formulated. To this end, station, elevation and vertical curve le...

Reclaimed asphalt pavement material (RAP) that are known as reconstruction and asphalt milling debris, constitute a major part of the waste materials. One of the applications that have been considered recently, is the use of these materials (RAP) in mixes such as roller-compacted concrete (RCC). Therefore, in this study, after experimental studies...

A way for seepage controlling under the dam, is using of complete cutoff wall or reducing seepage using a vertical low permeable cutoff wall. Plastic concrete consist of aggregates, cement, water and clay mixed at a high water cement ratio, to produce a ductile material. For plastic concrete that is placed with tremie concrete placement method, slu...

The primary objective of this study is exploring the moisture susceptibility of unmodified and SBS-modified hot and warm mix asphalt mixtures. To this end, two different WMA additives including Aspha-min and Sasobit were employed to fabricate WMA specimens. The moisture susceptibility of warm polymer modified asphalt (WPMA) mixes was evaluated usin...

Plastic concrete is usually used to build impermeable barriers (cut-off walls), contaminated sites, or leakage control of foundations with high penetration in dams. Effect of clay dosage, aggregate and cement were studied on compressive and tensile strength of bentonite plastic concrete. There was a tendency to reduce the compressive and tensile st...

Plastic concrete consists of aggregates, cement, water and clay, mixed at a high water cement ratio, to produce a ductile material [1]. It is used for creating an impermeable barrier (cut-off wall) for containment of contaminated sites or seepage control in highly permeable dam foundations. The effects of clay type and clay dosage on compressive st...

Resilient modulus of subgrade soil is one of the most important parameters in terms of pavement analysis and design. This parameter is used for design of pavement structure based on both empirical (e.g. AASHTO 1993) and mechanistic-empirical methods (e.g. MEPDG). In order to determine resilient modulus, dynamic triaxial loading test should be condu...

This paper aims to assess the application of Support Vector Machine (SVM) regression in order to analysis flexible pavements. To this end, 10000 Four-layer flexible pavement sections consisted of asphalt concrete layer, granular base layer, granular subbase layer, and subgrade soil were analyzed under the effect of standard axle loading using multi...

In order to consider the effect of loading time and temperature on the stiffness modulus of asphalt mixtures in current mechanistic-empirical pavement design methods, such as Mechanistic-Empirical Pavement Design Guide (MEPDG), the quasi-static analysis assuming elastic behavior of asphalt mixtures is employed instead of dynamic analysis assuming v...

One of the most important input parameters for pavement design using empirical mechanistic method, is the resilient modulus of various materials. Resilient modulus is commonly determined by dynamic triaxial loading test which is very costly and time-consuming and requires special laboratory facilities.The purpose of this paper is to develop a model...

Plastic concrete cutoff wall technology has been successfully applied to those water-control engineering projects with higher requirements for seepage control. The quantity and quality of clay, aggregate and cement, determine the appropriateness of plastic concrete. Therefore, in this study, laboratory tests of four diverse mix designs with bentoni...

One of the most important input parameters for design of pavement structure based on mechanistic-empirical method is resilient modulus of different pavement materials. This research aims to provide a model for predicting resilient modulus of stabilized base subjected to wet-dry cycles based on Artificial Neural Network (ANN). Dataset for developing...

In this study, an artificial neural network was developed in order to analyze flexible pavement structure and determine its critical responses under the influence of standard axle loading. In doing so, more than 10000 four-layered flexible pavement sections composed of asphalt concrete layer, base layer, subbase layer, and subgrade soil were analyz...

The primary step in design of a pavement using Mechanistic-Empirical (M-E) method is the analysis of pavement and calculation of the critical responses of pavement under various loadings. This confirms the need for developing pavement analysis software as an analytical base of the M-E method. To this end, NonPAS program has been developed for linea...

ترک‌های خستگي از مهم‌ترین خرابی‌های روسازی‌های آسفالتي و از معيارهاي اصلي در طراحی اين نوع روسازی‌ها هستند. زمان استراحت بارگذاري نيز از تأثيرگذارترين پارامترها بر عمر خستگی مخلوط‌های آسفالتی است. مطالعات پیشین محققان بر روی آسفالت‌های غیر پلیمری نشان می‌دهد كه در حضور دورۀ استراحت بارگذاری یا افزايش زمان آن، عمر خستگي این نوع مخلوط‌های آسفالتی در...

Fatigue life of asphalt mixes in laboratory tests is commonly determined by applying a sinusoidal or haversine waveform with specific frequency. The pavement structure and loading conditions affect the shape and the frequency of tensile response pulses at the bottom of asphalt layer. This paper introduces two methods for predicting the loading freq...

Resilient modulus (Mr) of asphalt mixtures in laboratory tests is usually measured by applying a haversine pulse with a specific duration and rest period which may not simulate the actual stress pulse occurring in field. In this paper, the effect of various parameters of loading pulse consist of the waveform, duration as well as the ratio of rest p...

Fatigue cracking is considered as one of the most serious distresses associated with flexible pavements. Loading frequency has a great effect on fatigue behavior of asphalt mixes. Such that for standard mixes it is widely stated that the fatigue life decreases by increasing loading frequency when the test is conducted in deformation control mode. O...

This study aims to investigate the effect of warm mix asphalt (WMA) additives on fatigue life of unmodified and SBS-modified asphalt mixes. Two different WMA additives, including Aspha-min and Sasobit were used to fabricate WMA specimens. Fatigue test was performed on warm polymer modified asphalt (PMA) by indirect tensile test on two stress levels...