Shamsad Ahmad

Shamsad Ahmad
King Fahd University of Petroleum and Minerals | KFUPM · Department of Civil Engineering

PhD

About

110
Publications
42,348
Reads
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2,616
Citations
Citations since 2016
64 Research Items
2073 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600

Publications

Publications (110)
Article
Steel tanks are used in industries for several purposes, such as the storage of chemicals, water, oil, petroleum products, etc. These steel tanks are frequently exposed to internal explosions due to flammable vapor clouds and external explosives. Generally, two types of blast loads are identified, including surface blast load and air blast load. Th...
Article
This paper reports the results of a study conducted to investigate the flexural behavior of corroded reinforced concrete (RC) beams that were first repaired with different types of cover repairing materials and then strengthened with the carbon fiber-reinforced polymer (CFRP) laminates. Thirteen RC beam specimens were prepared. One specimen was use...
Article
This study evaluated the strength development in hyperalkalized concrete mixtures incorporating cement waste-derived Portlandite (CDP), synthesized from two variants of cement kiln dust (CKD). The source CKDs (coded CKD1 and CKD2) and synthesized CDPs (coded CDP1 and CDP2) were characterized physically and mineralogically, after which the CDPs were...
Article
Full-text available
This paper describes a study on finite element modeling (FEM) carried out on the ABAQUS platform for the prediction of flexural strength of corrosion-damaged reinforced concrete (RC) beams strengthened using layers of ultra-high-performance concrete (UHPC). Considering different combinations of the degree of reinforcement corrosion and thickness an...
Article
This article aims to investigate the flexural behavior of strengthened corroded reinforced concrete (RC) beams using carbon fiber-reinforced polymer (CFRP) laminates and using a hybrid system of CFRP laminates and ultrahigh-performance concrete (UHPC) layers. A total of 15 RC beam specimens were prepared, out of which one specimen was uncorroded–un...
Article
The present study aims to explore the possibility of reclaiming petroleum oil-contaminated soil for its use as a pavement subbase material after the stabilization/solidification treatment. The contaminated soil was characterized in terms of its geotechnical and chemical parameters using samples collected from a beach site that was contaminated by p...
Article
Full-text available
The production of Portland cement is a significant source of carbon emission into the atmosphere. Therefore, the utilization of a cement byproduct to enhance carbon sequestration in concrete contributes to carbon and waste cycling, thus promotes cleaner production. This study evaluated the impact of cement kiln dust (CKD), an industrial waste from...
Article
Ultra-high-performance concrete (UHPC) is one of the contemporary overlay materials for repairing and retrofitting of reinforced concrete (RC) members. It possesses excellent compressive and tensile strength, as well as long durability. Nevertheless, the bonding performance between the overlay interface (UHPC) and the substrate concrete must be ade...
Article
Emerging demands to achieve zero carbon emissions and develop renewable energy resources necessitate the development of appropriate energy storage systems. To achieve this, several alternatives to conventional energy storage devices, such as Li‐ion batteries or capacitors to more sustainable and scalable energy storage systems, are being explored....
Article
Full-text available
The present study aimed at utilizing locally available metakaolin (MK) and limestone powder (LSP) as base binders for developing alkali-activated concrete. Ordinary Portland cement (OPC) was used as a secondary binder. Specimens with different primary binder (MK or LSP), its content (70%, 85%, or 100%), activator type (NaOH- or KOH-based), and acti...
Article
In the present work, effect of inclusion of silica fume on the performance of natural pozzolan-based cement concrete was investigated. Natural pozzolan, obtained from volcanic rocks, was used as the main supplementary cementitious material to partially replace the Portland cement. Silica fume was admixed at an optimum dosage, optimally selected bas...
Article
Full-text available
Researchers in the past have reported significant uncertainties involved in evaluating the risk of soil liquefaction using deterministic approaches. Therefore, to improve the accuracy and remove the uncertainties involved the present research aims to explore the possibility of using artificial intelligence (AI) to study earthquake-induced soil liqu...
Article
The paper presents the effectiveness of epoxy resin coatings modified with heavy fuel oil ash (HFOA) submicron/nano (S/N) carbon particles in enhancing concrete durability. HFOA, a waste material generated from the combustion of heavy fuel oil in power plants, was pyrolyzed and ball- milled for the preparation of S/N carbon particles, which were mi...
Article
This paper reports the effects of key factors on the properties of geopolymer concrete mixtures containing 100, 90, and 85 mass% of natural pozzolan (NP) as primary and 0, 10, and 15 mass% of Portland cement as secondary cementitious materials. Two types of alkaline activators (NaOH and KOH), and three different sodium silicate (SS)/(NaOH or KOH) r...
Article
The durability of concrete incorporating crumb rubber (CR) is adversely affected due to the incompatibility of the CR particles with other ingredients of conventional concrete. Consequently, efforts have been made to improve the durability of concrete by treating the CR. In the present work, the effect of treating CR with NaOH, KMnO4, and cement on...
Article
Ultra-high performance concrete (UHPC), possessing excellent mechanical properties, can be used as an excellent material to repair or strengthen the reinforced concrete structural elements. However, the effectiveness of repairing and strengthening by applying the layers of UHPC on the surface of substrate concrete depends on whether the interface b...
Article
Several non-destructive test (NDT) methods have been used to assess the quality of built concrete. The most popular NDT methods used for in situ testing of concrete are the rebound hammer and ultrasonic pulse velocity techniques. Several factors related to the composition of concrete mixtures affect the estimation of strength and other properties o...
Article
The construction industry is geared towards the use of sustainable building materials to accrue related environmental and economic benefits. In the present study, waste crumb rubber (CR) particles were pretreated using NaOH, KMnO4, and cement and used to replace 2%, 8%, 16%, 24% and 40% of the sand in concrete. The effect of the selected treatment...
Article
Ultrahigh-performance concrete (UHPC) is a smart material used in engineering structures that are subjected to high flexural, shear, 7 3 impact, and dynamic loadings to ensure safety against explosions and other accidental loads. However, in order for UHPC to be used in structural 8 members in nuclear power plants, it needs to provide radiation shi...
Conference Paper
The corrosion effect on the steel bar in reinforced concrete is one of the major issues for the durability of concrete throughout the world. The service life of each type of building structure is severely damaged by reinforcement corrosion, which results in billions of dollars annually in repair and maintenance. Therefore, evaluating and monitoring...
Article
This paper presents a study on evaluating the effect of two key factors, namely, the hybridization of straight and hooked steel fibers and curing methods, on the mechanical properties of ultra-high-performance concrete (UHPC). The UHPC specimens using the same proportions of the water, binder, and filler were prepared considering five different com...
Article
The present work was conducted to examine the beneficial effects of activating natural pozzolan (NP) using hydrated lime (HL) for its efficient utilization in concrete. Optimum dosages of NP and HL determined based on the performance of several trial mixtures to be used in concrete as a partial replacement of ordinary Portland cement (OPC). Three m...
Article
Jute stick, one of the most commonly and abundantly available agricultural waste product, was converted to a value‐added submicron/nano jute carbon using pyrolysis and high energy ball milling techniques. The submicron/nano jute carbon was characterized using FE‐SEM, TEM, EDS, XRD, XPS and Raman spectroscopy. The anticorrosive performance of the su...
Article
Strengthening the seismic deficient beam-column joints (BCJs) in reinforced concrete structures is mostly adopted to avoid any devastating consequences of high-intensity earthquakes. To evaluate the performance of BCJs against seismic action, experimental testing of BCJs under cyclic loading is a time-consuming and cost-intensive work due to the re...
Article
Heavy fuel oil ash (HFOA), an industrial waste material generated due to incomplete combustion of heavy fuel oil in a power plant, was used to prepare submicron-/nano-carbon by pyrolysis and ball milling. The developed submicron-/nano-carbon was characterized to determine its morphology, structure, and chemical composition using field-emission scan...
Article
Heavyweight concrete having unit weight above 2600 kg/m3 has wide applications that include radiation shielding, offshore, and ballasting of pipelines, etc. In this study, high-performance heavyweight concrete mixtures were developed utilizing industrial byproducts as high-density coarse aggregates. These heavyweight coarse aggregates included stee...
Article
Full-text available
In the global race of development, a huge amount of wastes having different characteristics and potential for environmental pollution are generated from various activities such as manufacturing, mining, processing, treatments, agriculture, etc. Considering the pollution threats to all three components of the environment (air, water and soil), it is...
Article
Full-text available
Stabilization/solidification (S/S) is a technique that has been widely used to treat contaminated soils using several types of stabilizers, such as ordinary Portland cement (OPC). In this research, marl soil that was collected from eastern Saudi Arabia was contaminated by either diesel or crude oil at different dosages (i.e., 2.5, 5, and 10% by the...
Article
This article presents the results of an experimental study conducted to assess the effect of sustained elevated temperature on the mechanical properties of ultrahigh performance concrete (UHPC). UHPC mixtures were prepared with four different dosages of polypropylene (PP) fibers, and each mixture was exposed to a sustained pre-spalling elevated tem...
Article
Heavyweight conventional concretes are traditionally used for shielding against nuclear radiations. However, mechanical properties and durability of conventional concrete are reported to be far less than that of ultra-high-performance concrete (UHPC) made with ultrafine materials and fibers without coarse aggregate ensuring a highly densified micro...
Article
Heavy fuel oil ash (HFOA) is generated as an industrial waste material during the combustion of heavy fuel oil in power/desalination plants. With increasing energy demands, a significant volume of HFOA is generated. It is generally disposed of in landfills, causing environmental pollution, as it contains several toxic elements. Recently, efforts we...
Article
Retarding admixtures are used to increase the setting time of concrete, especially under hot weather conditions. They provide longer time for concrete to be transported, placed and consolidated. Several commercial retarders are used to extend the setting time of concrete. However, they have a shorter shelf-life as they are commonly supplied in a li...
Article
Different treatment strategies have been explored in a quest to improve the properties of recycled aggregate concrete (RAC). The improvement strategies are directed towards the removal of residual layers of old mortar on the recycled coarse aggregate (RA). The removal of old mortar layer improves the bond between the new mortar and the RA that make...
Article
There is an increasing tendency to use recycled aggregate to produce concrete due to diminishing sources of natural aggregate. The properties of recycled aggregate concrete (RAC) are inferior to that of normal aggregate concrete. Several strategies including the use of supplementary cementitious materials (SCMs) are adopted to improve the propertie...
Article
Total dissolved solids (TDS) is one of the main impurities in mixing water that can influence the properties of concrete, and therefore, the codes of practice limit the concentration of TDS in water used for producing concrete. The present study investigates the effect of TDS present in the mixing water on the properties of concrete in fresh and ha...
Article
Full-text available
The work presented in this paper was aimed to study the influence of sugar dosage on the setting time and strength of two types of Portland cements (Type I and Type V) widely used in Saudi Arabia, leading towards selection of an optimal dosage of sugar as an alternative set retarder. Paste and mortar specimens were prepared with different dosages o...
Article
Full-text available
The paper presents an experimental study on assessment of the effect of accelerated carbonation curing (ACC) on the performance of two concrete mixtures having the same mixture proportions but different cementitious materials (plain-cement and fly-ash-blended-cement). Different sets of specimens were cast utilising both concrete mixtures and were t...
Article
This paper reports an experimental investigation conducted to evaluate the durability performance of concrete mixtures prepared utilizing blends of Type I Portland cement (OPC) and natural pozzolans (NPs) obtained from three different sources in Saudi Arabia. The control concrete mixture containing OPC alone as the binder and three concrete mixture...
Article
This paper presents a study on the shear behavior of reinforced concrete (RC) beams strengthened by jacketing the surfaces of the beams using ultra-high performance fiber reinforced concrete (UHPC). The surfaces of the RC beams were prepared by sandblasting and UHPC was cast in situ over the surfaces of RC beams. The beams were strengthened using t...
Article
In the present work, an experimental investigation was carried out to evaluate the radiation shielding performance of heavy-weight concrete mixtures prepared using different high-density coarse aggregates that included steel slag, steel shot, and iron ore. Normal-weight limestone aggregate was also used in control mixture as well as for partial rep...
Conference Paper
Ultra high-performance fiber reinforced concrete (UHPFRC) is a smart concrete material that possesses very high strength, modulus of elasticity, ductility, and excellent durability characteristics because of its very dense homogenous microstructure. Due to the excellent performance of UHPFRC, it can be used as an alternative material for strengthen...
Article
Full-text available
This paper presents a study on the effects of accelerated carbonation curing (ACC) on performance of self-compacting concrete (SCC) mixtures prepared using limestone powder (LSP) alone and blend of limestone powder and silica fume (SF) as mineral fillers. Specimens cast using both SCC mixtures were subjected to ACC that consisted of exposing specim...
Article
In the present study, ultra-high performance concrete (UHPC) mixtures reinforced with varying dosage of steel fibers were considered for studying the effects of exposure duration and fiber content on mechanical properties of the mixtures subjected to a sustained pre-spalling elevated temperature of 300 ºC for different durations. Test results showe...
Article
Full-text available
The aim of the present research includes an experimental investigation of flexural behavior of lightweight reinforced concrete one-way slabs with different ratios of course aggregate. Nine lightweight reinforced concrete one- way slabs incorporated by two types of lightweight course aggregate were tested in these investigation. Also the mechanical...
Article
Ultra-high performance concrete (UHPC), comprising of high amounts of cement and microsilica as binder and micro filler, is a new generation of concrete possessing highly dense microstructure with excellent mechanical properties, durability characteristics and ductility (fracture toughness). However, the use of high amounts of cement and microsilic...
Article
Full-text available
In the reported study,lightweight concrete mixtures were prepared by utilizing different dosages of crushed medical solid watse as a partial replacement of normal coarse aggregate. An additive was used to ensure a good between plastic waste particles and other concrete ingredients. A slump test was conducted on each mixture to measure the workabili...
Article
The modeling of loss of bond between reinforcing bars (rebars) and concrete due to corrosion is useful in studying the behavior and prediction of residual load bearing capacity of corroded reinforced concrete (RC) members. In the present work, first the possibility of using different methods to simulate the rebars-concrete bonding, which is used in...
Article
Unconfined compressive strength (UCS) of rocks, determined by loading the rock specimens along their longitudinal axis without lateral restraint, is one of the important engineering properties required for assessing the mechanical behavior of the rocks. However, determining UCS using direct method requires stringent sample preparation and testing t...
Article
This paper presents a study on evaluation of seismic performance of shear-deficient beam-column joints (BCJs) strengthened by ultra-high performance fiber reinforced concrete (UHPFRC). Normal concrete BCJs having deficiencies in resisting the seismic action were cast, strengthened with a thin layer of UHPFRC, and tested under seismic loading. Two d...
Article
The reported study was conducted to assess the geotechnical properties of plastic marl contaminated with diesel. The geotechnical properties of the uncontaminated soil, including gradation, Atterberg limits, compaction characteristics, angle of internal friction, cohesion and unconfined compressive strength (qu), were initially evaluated. Thereafte...
Article
The work presents a design methodology for carrying out durability-based optimal design of reinforced concrete (RC) structures exposed to corrosive environments causing the problems of chloride-induced reinforcement corrosion. For the purpose, an extensive experimental investigation was carried out to generate the data required for obtaining empiri...
Article
This computational investigation focused on numerical modeling of the shear behavior of ultra-high-performance concrete (UHPC) beams reinforced longitudinally with high-strength rebars and ordinary-strength steel (stirrups). Nonlinear three-dimensional finite element model, using the concrete damaged plasticity model and material properties obtaine...
Conference Paper
Full-text available
A series of ten different mixtures of self-compacting concrete (SCC) were designed and prepared utilizing fly ash, natural pozzolana, silica fume, cement kiln dust, limestone powder, bag house dust, pulverized steel slag, and metakaolin as alternative mineral fillers. For each mixture, firstly the optimum dosages of superplasticizer and viscosity m...
Article
Accelerated carbonation curing (ACC) is a new technique for curing of concrete that entails sequestering carbon dioxide (CO2) gas into freshly cast concrete, resulting in the improvement of physico-mechanical properties and durability characteristics of concrete. This paper presents the results of an experimental study conducted to evaluate the eff...
Article
Full-text available
Initiation of corrosion of steel in reinforced concrete (RC) structures subjected to chloride exposures mainly depends on coefficient of chloride diffusion, Dc , of concrete. Therefore, Dc is one of the key parameters needed for prediction of initiation of reinforcement corrosion. Fick’s second law of diffusion has been used for long time to derive...
Article
Purpose This study aims to make an effort to develop a model to predict the residual flexural strength of reinforced concrete beams subjected to reinforcement corrosion. Design/methodology/approach For generating the required data to develop the model, a set of experimental variables was considered that included corrosion current density, corros...
Article
Full-text available
In a corrosive environment similar to that of the Arabian Gulf, use of high-performance concrete is one of the options to ensure a target service life of concrete structures. However, in absence of good quality coarse aggregates, it is a challenging task to produce high-performance concrete. Recently, the possibility of producing ultra-high-perform...
Article
This paper presents a methodology proposed based on experimental and analytical procedures for optimizing concrete mixture design parameters and concrete cover thickness to achieve specified service life of a reinforced concrete (RC) member subjected to severe chloride exposure conditions. To explain utility of the suggested methodology, an experim...
Article
Full-text available
This paper presents results of an experimental study on the effect of concrete strength class on performance of carbon-fiber-reinforced-polymer (CFRP)-strengthened concrete subjected to compression. Test results indicated that the strength of CFRP-confined concrete increases with increase in number of confining layers; however, the increase in stre...
Article
The main objective of the study presented in this paper was to examine the effect of key factors, which affect the performance of reactive powder concrete (RPC) mixtures. Firstly, an optimum sand grading was selected based on the maximum compressive strength and acceptable flow of a typical RPC mixture keeping the proportions of its ingredients con...
Article
Existence of ultra-high performance concrete (UHPC) is the result of one of the latest advances in concrete technology. As compared to the normal concrete mixtures, the mixtures of UHPC are reported to have several times more strength, elastic modulus, fracture toughness, ductility and durability. UHPC is prepared by mixing high amounts of cement a...
Article
The paper presents an experimental study on the evaluation of the compressive strength and modulus of elasticity of ultra-high performance concrete (UHPC) prepared with varying steel fibre contents, cured in water and exposed in air, and subjected to three exposure conditions (after 28 d of curing): laboratory environment, alternate heating-cooling...
Article
The high unit cost of self-consolidating concrete (SCC) resulting from the use of conventional filler materials, such as fly ash or silica fume, has been identified as the main hindrance to its widespread use particularly at places where these materials are not available locally. To achieve economy in the production of SCC, it is highly desirable t...
Article
Full-text available
Purpose – The purpose of this paper was mainly to select one of the three types of coatings for protection of steel used as reinforcement in composite pipes (thin steel shell covered by cement-mortar) subjected to chloride exposure. To achieve this target, an attempt was made to develop a simple methodology for evaluating the performance of corrosi...
Article
Self-consolidating concrete (SCC) is a concrete material possessing an ability to take formwork shapes and pass through congested reinforcement bars without being vibrated, making it a ‘smart concrete’ material. However, the high cost of SCC resulting from the use of mineral fillers and high cement content has been a main factor impeding the widesp...