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Öğe 3D-printed geogrids' tensile performance: impact of filament type(Emerald Group Publishing Ltd, 2025) Ok, Bahadir; Unverdi, Murteda; Seyedzavvar, Mirsadegh; Boga, Cem; Sarici, TalhaPurpose - This study aims to explore the potential of three-dimensional (3D) printing technology to enhance geogrid production, focusing on the influence of filament type on tensile performance. Geogrids, which reinforced soils by forming interlocking mechanisms with soil grains, were manufactured using polypropylene (PP) and polyethylene terephthalate glycol-modified (PET-G) filaments. The printability of these materials, along with thermoplastic polyurethane (TPU) and high-density polyethylene (HDPE), was initially assessed, revealing challenges with TPU and HDPE. Design/methodology/approach - Tensile tests, conducted on both single-rib and multirib samples, compared the mechanical performance of the 3D-printed geogrids against a factory-made PP geogrid. Findings - The results indicated that while the factory-made geogrid demonstrated superior tensile strength and ductility, 3D-printed geogrids, particularly those made with PP, exhibited promising tensile characteristics that could be suitable for specific applications. However, 3D-printed PET-G geogrids showed higher tensile strength but were more brittle. The findings suggest that although 3D printing offers a viable method for geogrid production, further optimization is required to achieve performance levels comparable to traditional manufacturing methods. Originality/value - While existing research on 3D-printed geogrids exists, studies comparing them with their factory-produced counterparts are currently limited. This research provides a unique comparison of the tensile modulus, elongation and tensile strength of factory-made geogrids and 3D-printed geogrids produced with different filaments.Öğe An Investigation of the Usability of Alkali-Activated Blast Furnace Slag-Additive Construction Demolition Waste as Filling Material(Mdpi, 2025) Sarici, Talha; Geckil, Tacettin; Ok, Bahadir; Aksoy, Huseyin SuhaIn this study, the usability of construction and demolition waste (CDW) aggregates as filling when stabilized with alkaline activator solution (AAS) and blast furnace slag (BFS) was investigated. The initial stage of this study involved determining the engineering properties of CDW by laboratory experiments. In the next stage, modified Proctor tests were performed to investigate the compaction behavior of CDW, to which 5% to 30% BFS was added with water or AAS. In the following stage, California bearing ratio experiments were performed to determine the mixture specimen with the highest strength. In the final stage, a weak soil layer was created in a test tank, and fillings of different thicknesses were built on it using CDW with and without additives in the determined optimum mixing ratio. Then, plate-loading tests were conducted using a model foundation to evaluate the load-deformation behavior of the fillings. The study's results indicated that adding BFS with water or AAS to CDW increased strength. Furthermore, the addition of 20% BFS yielded the highest strength value, and the CDW aggregates with the added BFS increased the ultimate bearing capacity by up to 4.72 times compared to those without the additive.Öğe Bearing capacity of footing supported by geogrid encased stone columns on soft soil(Techno-Press, 2017) Demir, Ahmet; Sarici, TalhaThe stone columns are increasingly being used as a soil improvement method for supporting a wide variety of structures (such as road embankment, buildings, storage tanks etc.) especially built on soft soil. Soil improvement by the stone column method overcomes the settlement problem and low stability. Nevertheless, stone column in very soft soils may not be functional due to insufficient lateral confinement. The required lateral confinement can be overcome by encasing the stone column with a suitable geosynthetic. Encasement of stone columns with geogrid is one of the ideal forms of improving the performance of stone columns. This paper presents the results of a series of experimental tests and numerical analysis to investigate the behavior of stone columns with and without geogrid encasement in soft clay deposits. A total of six small scale laboratory tests were carried out using circular footing with diameters of 0.05 m and 0.1 m. In addition, a well-known available software program called PLAXIS was used to numerical analysis, which was validated by the experimental tests. After good validation, detailed of parametric studies were performed. Different parameters such as bearing capacity of stone columns with and without geogrid encasement, stiffness of geogrid encasement, depth of encasement from ground level, diameter of stone columns, internal friction angle of crushed stone and lateral bulging of stone columns were analyzed. As a result of this study, stone column method can be used in the improvement of soft ground and clear development in the bearing capacity of the stone column occurs due to geogrid encasement. Moreover, the bearing capacity is effected from the diameter of the stone column, the angle of internal friction, rigidity of the encasement, and depth of encasement. Lateral bulging is minimized by geogrid encasement and effected from geogrid rigidity, depth of encasement and diameter of the stone column.Öğe Evaluating of geosynthetics reinforced road base with plate loading tests(Pamukkale Univ, 2021) Ok, Bahadir; Demir, Ahmet; Sarici, Talha; Ovali, MesutThe use of geosynthetics as reinforcement for the base layer of flexible pavement systems has grown steadily over the past thirty years. Although geosynthetic reinforcements can lead to improved pavement performance, the specific conditions or mechanisms that govern the reinforcement are unclear, largely remaining unidentified and unmeasured. In this study, the assessment of the effect of geogrids on the roads that is reinforced granular fill layer over soft clay soil, section's ability to support before and after traffic loads were investigated using plate loading tests in situ. The results of the field tests show that geosynthetic reinforcement as is an effective method in reducing deformation and repairing granular fill layer overlying soft foundations.Öğe Evaluation of geotechnical properties of Dogansehir district with geographical information systems after the February 6, 2023 earthquakes(Springer, 2024) Sarici, Talha; Ozcan, Rumeysa TugbaParameters such as the bearing capacity of the soil and liquefaction potentials are of vital importance, as can be seen in the Kahramanmara & scedil;-centered earthquakes that occurred on February 6, 2023. At this point, the bearing capacity and liquefaction potentials of the Do & gbreve;an & scedil;ehir district of Malatya province, which has experienced many devastations both historically and recently, were investigated with the micro zonation investigation reports obtained from Malatya Metropolitan Municipality. The correlations recommended by the international literature and Turkish Building Earthquake Code were used and the results were mapped with a package program working with Geographical Information Systems. In addition, the groundwater level, seismic parameters and soil classifications of the study area were determined and then mapped. Liquefaction potentials were observed throughout the study area, including the central settlement of Do & gbreve;an & scedil;ehir, and this potential was observed even at a depth of 12 m in some areas. It was also found that the bearing capacity values of the central settlement were lower than the other regions. Finally, post-earthquake damages were interpreted based on the maps created within the scope of the study. It was understood that such studies are of vital importance for earthquake-prone regions before and after earthquakes.Öğe Evaluation of Granular Fill Layer Underlain by Soft Clay Soil Using Large Scale Cyclic Plate Loading Tests(Springer Int Publ Ag, 2023) Demir, Ahmet; Ok, Bahadir; Sarici, TalhaIn general, granular fill materials are widely used to construct new pavement and rehabilitate old pavement. For pavement design, it is essential to know the basic characteristics, such as the permanent deformation behavior of these materials. Considering this phenomenon, this study aims to explain the performance of granular fill layers in pavement systems using cyclic plate load tests. For this purpose, a large-scale cyclic plate load test facility, also known as pavement model testing (PMT), was developed to investigate the permanent deformation characteristics of the pavement structure. To conduct experiments, a standard pavement structure was built with granular fill layers on top of a soft clay subgrade and a geotextile between the subgrade and the base layer. The PMT was used to apply a 40 kN cyclic load through a steel plate with a 305 mm diameter for up to 10,000 cycles after the pavement structure was built. A total of four tests were carried out to evaluate the effects of the granular fill layer's thickness on the pavement's permanent deformation. Furthermore, an analytical solution was developed for the fill layer thickness using the test results. Additionally, the outcomes of some previous studies in the literature were compared to the ones that were obtained. The results of this study indicate that the permanent deformations of the pavement structure and the subgrade increased with the number of load cycles. The permanent deformations began to limit at 3000 cycles when the fill layer thickness was 20 cm, but it was observed that deformations did not limit at 3000 cycles when the fill layer thickness increased to 45 cm. Also, the permanent deformations decreased by two times when the granular fill layer thickness doubled appropriately.Öğe Evaluation of Rockfill Stabilized-Geosynthetics Reinforced Road Base with Repeated Plate Loading Tests(Mdpi, 2024) Demir, Ahmet; Ok, Bahadir; Sarici, TalhaIn this study, the performance of unpaved road sections over soft clay soil geosynthetic-reinforced and stabilized with rock fill layer was evaluated using repeated plate loading tests. A total of 10 field tests were carried out using a circular model rigid plate with a diameter of 0.30 m. The parameters investigated included the location and type of geosynthetics and loading conditions (number of loading cycle and traffic loading condition). Based on the test results, the least deformation was observed in the rockfill section. The geocell placed at a depth of one-third thickness of the granular fill layer from the top showed improved performance and was more effective as compared with other geosynthetic reinforcements. However, for granular fill geosynthetic-reinforced or stabilized with rock fill layer, the results demonstrate an improvement in the rutting performance of the pavement and the definite trend of increasing reloading elastic modulus, depending on the traffic loading situation. It has been also observed that the use of geocell or geogrid reinforcement in granular fill layer or more rigid rockfill layer provides an important increase in the modulus improvement ratio (MIR) by at least 36%, 45% and 60% compared to the granular fill section, respectively.Öğe Evaluation of the behavior of screw pile groups in clay soils under compressive and uplift forces(Techno-Press, 2025) Sarici, Talha; Ozcan, MustafaScrew piles, which is one of the ground improvement methods, are finding more place in practice day by day. For this reason, there is a need for studies to investigate the behavior of screw piles under compressive and uplift loads. In this context, the behavior of screw piles with different number of helixes in groups was investigated with different number of screws and group patterns. To evaluate behavior of screw piles, settlement ratios, group efficiency and helix number efficiency values were calculated by using finite element method. Based on an experimental study from the literature, modelling was performed on PLAXIS 3D, which works with the finite element method, and the results were matched. As a result of this study, it was observed that increasing the number of helixes increased the bearing capacity under both compressive and uplift forces. In addition, it was determined that group efficacy values changed in different patterns and different number of pile groups. Optimum screw pile type for group patterns also differs for different load conditions. The modelling results were visualized and were found to match with the failure surfaces reported in the literature. It was suggested that optimum helix number and group pattern for screw pile applications can be achieved with evaluating settlement and efficiency values together.Öğe Experimental and numerical analysis of shear behaviour at the interface geopolymer mortar and sand(Nature Portfolio, 2026) Bayindir, Furkan; Ekinci, Enes; Sarici, Talha; Ozmen, AlperThis study aimed to examine the impact of various production parameters on the shear performance at the interface between geopolymer mortar (GPM) and sand soil. Initially, the effects of varying NaOH concentrations (5, 10 and 15 M), aggregate types (stream aggregates (SA), crushed stone aggregates (CS) and construction and demolition waste (CDW) aggregates) and alkali/binder ratios (0.5 and 0.6) on GBFS-based GPM specimens were investigated. For this purpose, compressive strength, water absorption and ultrasonic pulse velocity (UPV) tests were carried out on GPM samples cured for 28 days. The maximum 28-day compressive strength (43.6 MPa) and the minimum water absorption (3.78%) were observed in GPM specimens activated with 15 M NaOH, produced with CS, water-cured and cast at an alkali/binder ratio of 0.5. Experimental findings revealed that the effects of aggregate type on high mechanical and low permeability properties were graded as CS > SA > CDW. Additionally, UPV test results showed positive correlation with compressive strength and water absorption values. Subsequently, the shear performance between GPM and sand soil were determined by using shear box test. In direct shear experiments, decreasing the alkali/binder ratio from 0.6 to 0.5 and the usage of CS increased the sand-GPM friction angle. Moreover, numerical modelling was employed to analysed soil-GPM interaction using the finite element method (FEM) in ABAQUS. FEM results showed that the obtained numerical findings demonstrated strong consistency with experimental data, capturing force-displacement trends therefore the numerical model can be used for parametric studies.Öğe Geotechnical properties of recycled construction and demolition materials for filling applications(Elsevier, 2020) Ok, Bahadir; Sarici, Talha; Talaslioglu, Tugrul; Yildiz, AbdulazimModern societies make a hard effort to improve the sustainability of resources due to enhanced environmental sensitivities in nowadays. This paper investigates the usability of recycled construction and demolition materials as an alternative to virgin aggregates in geotechnical applications such as the filling. The physical and geotechnical properties of recycled construction and demolition materials were determined by laboratory tests (i.e. sieve test, flatness test, Los Angeles abrasion test, water absorption test, pycnometer test, modified compaction test, California bearing ratio test, unconfined compressive strength test and resilient modulus test) and a comprehensive laboratory evaluation was carried out. Moreover, similar tests were conducted with a type of high quality virgin aggregate material frequently used in fillings. The results of the tests conducted on construction and demolition materials were compared with results of the tests conducted on both virgin aggregate and different recycled aggregates which are accepted as an alternative to virgin aggregates used in the filling in the literature. Results of the tests conducted on construction and demolition materials were also evaluated according to the limit values in technical specifications of highway administrations of various countries. As a result of this study, it has been concluded that construction and demolition materials can be a good alternative to virgin aggregate used in the filling provided that it is taken measure against excessive water absorption value.Öğe Interpretation of geotechnical risk maps for Malatya province in terms of earthquake sequence on February 6, 2023(Springer, 2025) Sarici, Talha; Ozcan, Rumeysa TugbaThe earthquake sequence that occurred on February 6, 2023, centered in T & uuml;rkiye caused extensive loss of life and significant damage. In this study, the geotechnical properties of the central districts of Malatya province, one of the provinces affected by these earthquakes, were calculated using data obtained. In the calculations, the correlations suggested by the Turkish Building Earthquake Code (TBEC) and internationally recommended correlations were used. Thus, the difference between the methods proposed by TBEC and internationally recommended correlations was interpreted. Using 1890 drilling data, 1765 seismic data, and 1764 microtremor data, calculations were made to determine bearing capacity values for 3 m x 3 m pad foundation, liquefaction potentials of the soil and soil classifications around this region. The results obtained from the calculations were mapped with geographical information systems-based software. Results of the study revealed that 2.9% of the study area in Battalgazi district and 1.71% for Ye & scedil;ilyurt district had liquefaction potential. Almost 80% of each district was found to have a soil class of ZD (medium dense gravel and sand or clay layers) according to TBEC. The findings of the study were compared with previous studies, satellite images of the study area and post-earthquake observations. In areas where damage caused by the earthquake sequence was observed intensively, bearing capacity values were relatively low. It was concluded that building on poor soil conditions poses a profoundly serious risk in terms of earthquakes and very serious precautions should be taken by gathering several disciplines during the construction of these structures.Öğe Investigation of Screw Pile Behavior in Cohesive Soil Under Uplift and Compressive Forces by Experimental Studies and Numerical Analyses(Springer Heidelberg, 2025) Sarici, Talha; Ozcan, MustafaWithin the scope of this study, experimental studies and numerical analyses were carried out to investigate the effect of the use of screw piles and traditional piles without screws on the bearing capacity of cohesive soils under the effect of uplift and compressive forces. In the experimental studies, the effect of changing the number of helixes and the effect of different overburden loads caused by this change were investigated. In numerical analyses, the finite element method was used via Plaxis 3D and a new design different from the commonly used modeling was created using the segmented helix model. After validating the results of numerical analysis and experimental study, the effect of different embedment depths and helix diameters on the behavior of cohesive soil reinforced with screw piles under loads was investigated. According to the results obtained from the study, the bearing capacity of cohesive soil increased as the screw pile helix number increased. Increase in bearing capacity was also observed with increasing embedment depth and helix diameter. In addition, the segmented helix model used in the numerical analyses represented the screw pile behavior more realistically.Öğe Investigation of the construction and demolition materials reinforced by geosynthetics(Emerald Group Publishing Ltd, 2023) Ok, Bahadir; Sarici, Talha; Demir, Ahmet; Talaslioglu, Tugrul; Yildiz, AbdulazimMany researchers suggest using construction and demolition materials in engineering applications (C & D) rather than virgin aggregates (VA). However, the engineering properties of the C & D tend to be poorer than those of the VA. This study presents the results of plate loading tests performed on unpaved roads with the C & D, reinforced by different types of geosynthetics on the soft subgrade. As part of these tests, the effects of some geosynthetics' parameters such as (1) the embedment depth, (2) height and pocket opening of geocell, (3) the embedment depths and number of geogrids, (4) the distance between geogrids, and (5) the stiffness of geotextile on the bearing capacity of the unpaved road were investigated. Besides, the same plate loading test was also conducted on an unpaved road built by the VA. As a result of this study, although the performance of the C & D was determined to be less than that of the VA, it was concluded that the C & D performed well enough to be used as an alternative to the VA on unpaved roads. Besides, with a very small number of geosynthetics, it was determined that the C & D could have a better performance than that of the VA.Öğe Investigation of the effect of stabilizing subgrade soils with recycled glass powder on freeze–thaw resistance(Gumushane University, 2026) Geçkil, Tacettin; Sarici, Talha; Karabaş, BahadırThe purpose of this research is to determine the freeze–thaw performance of subgrade soils when stabilized using recycled glass powder (CT). Ensuring the durability of pavement foundations under varying climatic conditions is a key engineering requirement, especially for highways in cold regions. Sandy and clayey soils with different CT contents were prepared, and both untreated and stabilized specimens were subjected to Standard Proctor and unconfined compressive strength (UCS) tests after 7 days of curing. Results showed that CT addition improved strength, with optimum values at 9% CT for clayey soil and 12% CT for sandy soil. Freeze–thaw resistance was assessed by subjecting untreated and optimum CT-stabilized specimens to 3, 6, and 12 cycles, each consisting of freezing at –23°C for 24 hours and thawing at 23 ± 2°C for 23 hours. The 7-day UCS values (0 cycle) were used as references. The results showed that the strength increased by 1.82 times in clay soil samples containing 9% CT and by 1.37 times in sandy soil samples containing 12% CT. It was determined that the highest strength and weight loss occurred at the end of 12cycles. The losses decreased to 78.90% and 1.36% with 12% CT addition, and to 60.64% and 0.78% with 9% CT addition, respectively. The use of CT enhanced both the compressive strength and freeze–thaw resistance of the soils; recycled glass powder can be considered an effective stabilization material, especially for areas exposed to freeze–thaw effects. © 2026, Gumushane University. All rights reserved.Öğe Investigation of the influence zone of stone columns with and without geogrid encasement by experimental and numerical studies(Elsevier, 2025) Demir, Ahmet; Sarici, Talha; Ok, Bahadir; Ozcan, MustafaThe influence zone for geogrid encased stone columns (GESC) and ordinary stone columns (OSC) were investigated in the scope of this study. For this purpose, a single stone column (OSC or GESC) was built in clay soil which was placed in tanks had various diameters to observe load-deformation behavior of a 5 cm diameter rigid model footing. The effects of the water content of clay soils on the behavior of stone columns were also investigated. This study consists of two stages. Firstly, experimental studies were conducted at the laboratory using model loading test setup, and secondly, models created with a finite element method (FEM) based software called as Plaxis and numerical analyses were carried. Experimental study results validated the FEM results closely for short-term stability. Therefore, further investigations on FEM models were carried out. As a result of this study, generally, geogrid encasement for the stone columns increased the bearing capacity and the decreased amount of lateral bulging and settlement. In addition, for OSC and GESC, the influence zone was about 5 and 6 times the stone column's diameter, respectively. So, it can be said that encasing the stone column with geogrid reduced the influence zone.Öğe Local scour protection using geocell for downstream of spillway(Academic Publication Council, 2021) Gul, Enes; Sarici, Talha; Dursun, Omerul FarukLocal scour is an important problem for hydraulic structures. The local scour in the downstream of dams causes problems such as the damage of the dam body stabilization, erosion of the slopes, and the submergence of the turbines. There are many studies investigating the local scour prediction of the downstream of the hydraulic structures, but in recent years, these studies have been replaced by studies of local scour reduction. The new idea of confining the bed materials using the geocell is becoming a popular solution. This solution can be especially used for the reinforcement of the soils. In this study, the preventability of the local scour downstream of chute channel by cellular confinement system, also known as geocell, was investigated. As a result, in case of using geocell, percentage reduction of the maximum scour depth up to 40.63% was observed.Öğe Model studies on recycled whole rubber tyre reinforced granular fillings on weak soil(Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2022) Geckil, Tacettin; Sarici, Talha; Ok, BahadirThe main purpose of this study is to determine the stress-strain behaviour of a rigid circular footing placed on recycled rubber tyre-reinforced granular filling built on weak soil. For this purpose, model plate loading tests were carried out on reinforced/unreinforced granular filling built with natural aggregates (NA) or construction and demolition waste materials (CDW). The rubber tyre used for reinforcement has become a waste material by completing its service life but it has retained its typical cylindrical shape. In model plate loading tests, the effects of the granular fillings, the type of fillings material and the placement of whole rubber tyre and/or geotextile in the granular fillings were investigated. Depending on the results of tests, it was determined that the bearing capacity was increased by reinforcing with the rubber tyre and/or the geotextile. Furthermore, it was specified that the highest increase in bearing capacity was occurred case of by reinforcing with the geotextile together with the rubber tyre of the granular filling. The CDW and the NA fills reinforced with geotextile together with the rubber tyre increased the bearing capacity of weak soils by 6.59 and 8.49 times, respectively, for the 5% deformation ratio. On the other hand, it was reported that although the bearing capacity of the NA was higher than that of the CDW, the bearing capacity of the reinforced CDW approached that of the NA.Öğe Preparation of poly(acrylamide-co-2-acrylamido-2-methylpropan sulfonic acid)-g-Carboxymethyl cellulose/Titanium dioxide hydrogels and modeling of their swelling capacity and mechanic strength behaviors by response surface method technique(Wiley, 2021) Boztepe, Cihangir; Daskin, Mahmut; Erdogan, Ahmet; Sarici, TalhaIt is very important that new generation, unique, high mechanical strength, and biocompatible hydrogel composites are developed due to their potential to be used as biomaterials in the biomedical field. Modeling of the swelling capacity and mechanical strength behavior of hydrogels is a domain of steadily increasing academic and industrial importance. These behaviors are difficult to model accurately due to hydrogels show very complex behavior depending on the content. In this study, a series of poly(acrylamide-co-2-acrylamido-2-methylpropan sulfonic acid)-g-carboxymethyl cellulose/TiO2 (poly(AAm-co-AMPS)-g-CMC/TiO2) superabsorbent hydrogel composites were prepared by free-radical graft copolymerization in aqueous solution. Structural and surface morphology characterizations were conducted by using Fourier-transform infrared spectroscopy and scanning electron microscope analysis techniques. For modeling the equilibrium swelling capacity and fracture strength behaviors of hydrogels, the composition parameters (such as mole ratio of AMPS/AAm, wt% of CMC, and wt% of TiO2) was proposed by response surface method (RSM) Design Expert-10 software. Statistical parameters showed that the RSM model has good performance in modeling the swelling capacity and mechanic fracture strength behaviors of poly(AAm-co-AMPS)-g-CMC/TiO2 hydrogel composites. According to the RSM model results, the maximum swelling capacity and fracture strength values were calculated as 270.39 g water/g polymer and 159.23 kPa, respectively.Öğe THE RESILIENT MODULUS OF HYBRID CONSTRUCTION AND DEMOLITION WASTES REINFORCED BY A GEOGRID(Univ Maribor, 2022) Sarici, Talha; Ok, Bahadir; Mert, Aykan; Comez, SenolThe use of construction and demolition wastes (C&D) in engineering applications is an important development for better sustainability. The main objective of this study, therefore, was to increase the use of C&D by improving their engineering behaviour. For this purpose, two methods were employed in this study: first, adding the virgin aggregates (VA) to the C&D, called hybrid C&D (C&D-VA), and second, reinforcing the C&D with a geogrid material. Test samples were prepared in six groups.The first three test groups were prepared with C&D, VA and C&D-VA. The other three test groups were formed with geogrid-reinforced C&D, VA and C&D-VA. Firstly, for the strength characteristics of the samples, the unconfined compressive strength and the California bearing ratio values were obtained with large-scale experiments. Subsequently, for the resilient behaviour of the samples, the resilient modulus values were determined using a large-scale triaxial test device. Consequently, some significant improvements were achieved via the methods employed in this study. In addition, it was observed that the best reinforcement effect for the C&D occurred when the geogrid was used and the VA was added to the C&D.Öğe The usability of construction and demolition wastes stabilized using alkali activated fly ash as filler material(Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2025) Geckil, Tacettin; Sarici, Talha; Aksoy, Huseyin SuhaSince construction and demolition waste (CDW) contain materials such as gypsum, wood, brick, plaster, etc., its engineering properties may not be at the desired quality. Therefore, if CDW is to be recycled and reused, the properties of CDW may need to be improved by various methods. In this study, the modifications in compaction and strength properties of CDW obtained from demolished building were investigated by adding fly ash (FA) at certain ratios. For this purpose, modified proctor, unconfined compression strength and California bearing ratio (CBR) tests were conducted on the CDW with and without FA-added. As a result of the experimental studies, it was observed that the addition of alkaline activator solution (AA) to the CDW increased the strength of the CDW. In addition, the strength of CDW increased significantly with the usage of AA in FA-added CDW samples. The FA additive ratio that gave the highest strength in the tests with water and AA was found to be 5% and 15%, respectively. As a result of the study, it is predicted that CDW with FA and AA can be used as a filling material as an alternative to natural aggregate.
