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Öğe Analysis of shrinkage and creep behaviors in polymer-coated lightweight concretes(Walter De Gruyter Gmbh, 2016) Bideci, Alper; Bideci, Özlem Sallı; Oymael, Sabit; Yıldırım, HasanThe creep and shrinkage properties of polymer-coated lightweight concretes were examined. Five-hundred-dose lightweight concretes were produced by coating pumice aggregates with three different polymers (Sonomeric1: SNMC, KB Pur 214: KBP, and Polipol3455: PLP). The 3-, 7-, and 28-day compressive strength values of the obtained lightweight concrete samples were determined, and the 840-h and 12-month creep and shrinkage deformations were measured. It was found that the ductility of the SNMC- and KBP-coated concrete samples increased, while their shrinkage deformation results decreased when compared with the control samples. In contrast, the ductility of PLP concrete samples decreased and the shrinkage deformation became higher. In conclusion, the use of SNMC- and KBP-coated pumice aggregates had a positive effect on the creep and shrinkage properties of the concrete. Furthermore, it was observed that the compressive strength values of the lightweight concretes made of the coated samples were higher than those of the control sample.Öğe Bond behavior of lightweight concretes containing coated pumice aggregate: hinged beam approach(Techno-Press, 2015) Beycioğlu, Ahmet; Arslan, Mehmet Emin; Bideci, Özlem Sallı; Bideci, Alper; Emiroğlu, MehmetThis paper presents an experimental study for determining the bond performance of lightweight concretes produced using pumice aggregate coated with colemanite-cement paste. For this purpose, eight hinged beam specimens were produced with four different concrete mixtures. 14 mm deformed bars with 10 Phi development lengths were selected constant for all test specimens. All the specimens were tested in bending and load-slip values were measured experimentally to determine the effect of colemanite-cement coated pumice aggregate on bond performances of lightweight concretes. Test results showed that, colemanite-cement coated pumice aggregate increases compressive strength and bond performance of the lightweight concretes, considerably.Öğe DETERMINATION OF COLOR HOMOGENEITY BY IMAGE PROCESSING IN CEMENT BASED MORTARS(Serban Solacolu Foundation, 2021) Çomak, Bekir; Bideci, Alper; Aykanat, Batuhan; Bideci, Özlem ŞallıWith the development of computer technologies in recent years, the usage of image processing techniques in different areas have significantly increased. Image processing is the computer study for altering the measured or saved digital image data in a manner to fit for a purpose in an electronical media. In this study, by adding red iron oxide pigment (RIOP) into cement mortars in 2%, 4%, 6% and 8% ratios, physical and mechanical characteristics of the mortars were analysed, and color homogenization of them were determined by image processing method. On the manufactured samples, consistency, density, water absorption, porosity, compressive strength, flexural strength tests and image processing analysis by open source coded ImageJ programme were performed. Also, SEM-EDS analyses were performed in order to determine the inner structure characteristics of the samples. As a result of this study, changes in physical and mechanical characteristics of the mortars have been observed in different ratios. When it is desired to obtain a red colored mortar, it is determined by image processing analysis that 6% of red iron oxide pigment (RIOP) addition to the mortar mixture would give the optimum result.Öğe Determination of homogeneity index of cementitious composites produced with eps beads by image processing techniques(Techno-Press, 2022) Çomak, Bekir; Aykanat, Batuhan; Bideci, Özlem Şallı; Bideci, AlperWith the improvements in computer technologies, utilization of image processing techniques has increased in many areas (such as medicine, defence industry, other industries etc.) Many different image processing techniques are used for surface analysis, detection of manufacturing defects, and determination of physical and mechanical characteristics of composite materials. In this study, cementitious composites were obtained by addition of Grounded Granulated Blast-Furnace Slag (GGBFS), Styrene Butadiene polymer (SBR), and Grounded Granulated Blast-Furnace Slag and Styrene Butadiene polymer together (GGBFS+SBR). Expanded Polystyrene (EPS) beads were added to these cementitious composites in different ratios (20%, 40% and 60%). The mechanical and physical characteristics of the composites were determined, and homogeneity indexes of the composites were determined by image processing techniques to determine EPS distribution forms in them. Physical and mechanical characteristics of the produced samples were obtained by applying consistency, density, water absorption, compressive strength (7 and 28 days), flexural strength (7 and 28 days) and tensile splitting strength (7 and 28 days) tests on them. Also, visual examination by using digital microscope, and image analysis by using image processing techniques with open source coded ImageJ program were performed. As a result of the study, it is determined that GGBFS and SBR addition strengthens the adhesion sites formed as it increases the adhesion power of the mixture and helps to get rid of the segregation problem caused by EPS. As a result of the image processing analysis it is demonstrated that GGBFS and SBR addition has positive contribution on homogeneity index. Copyright © 2022 Techno-Press, Ltd.Öğe Effect of Styrene Butadiene Copolymer (SBR) admixture on high strength concrete(Elsevier Sci Ltd, 2016) Doğan, Murat; Bideci, AlperCurrently, the concrete quality increases with improving technologies. High strength concrete (HSC) is a special kind of concrete produced in high fluidity by using chemical admixtures (plasticisers). In this study, for high strength concretes produced in C50/C60 designs, Styrene Butadiene Copolymer (SBR) in different weight ratios such as Control (0%), 1%, 3%, 5% and 8% was used instead of cement, and also strength properties of SBR were examined. For this aim, unit weight, water absorption ratio, compressive strength for 3, 7 and 28 days, splitting tensile strength, ultrasonic pulse velocity and frost resistance tests were applied. Also, SEM (Scanning Electron Microscope) and EDS analysis of samples were examined. As a result of the study, it is determined that concrete samples with 1% SBR admixture have higher values and contributions to strength. (c) 2016 Elsevier Ltd. All rights reserved.Öğe Effects of hemp fibers on characteristics of cement based mortar(Elsevier Sci Ltd, 2018) Çomak, Bekir; Bideci, Alper; Bideci, Özlem SallıIn recent years, using addition of fibers with plant origin in concretes has increased significantly. They not only enhance the mechanical characteristics of cement mortars, but also they are renewable, easy to access and cheap and this makes the use of plant fibers more widespread. Hemp fiber is a plant, which is planted in many places of the world and obtained in large amounts, is environmentally friendly and also used in manufacturing of composite materials. In this study, hemp fiber reinforced cement mortars with different ratios (0%, 1%, 2%, 3%) and different lengths (6 mm, 12 mm and 18 mm) were manufactured. Density, water absorption, compressive strength, flexural strength, compressive strength after flexural tensile and splitting tensile strength tests were performed on manufactured samples. Also, in order to determine the inner structural characteristics of samples, SEM analysis was conducted. As a result of the study, it was determined that cement mortars reinforced with 2-3% amount and 12 mm length of natural hemp fiber give the optimum results. (C) 2018 Elsevier Ltd. All rights reserved.Öğe Environmental performance analysis of insulated composite facade panels using life cycle assessment (LCA)(Elsevier Sci Ltd, 2019) Yılmaz, Emrah; Arslan, Hakan; Bideci, AlperThe construction sector, which accounts for 10% of global economic activity, consumes approximately 40% of the world's energy and materials. Besides, it accounts for the consumption of 17% of world water resources and 25% of manufactured wood and is responsible for about 50% of greenhouse gas emissions. This situation makes the assessment of the environmental impact of construction materials fundamental. The Life Cycle Assessment (LCA) methodology is a scientific method that is used to identify, report and manage the environmental impacts of a product, starting with the acquisition of raw materials, including production, shipment, consumer use, and disposal as waste after use. In this study, environmental effects of 50 mm thick polyurethane and rockwool filled composite facade panels were determined by using LCA method and compared. Hence, the facade panels' cradle-to-gate process (raw material supply, production and disposal phases) were examined. As a result of the study, it is seen that the polyurethane filled composite facade panel has more advantageous environmental performance than the rockwool filled composite facade panel. (C) 2019 Elsevier Ltd. All rights reserved.Öğe Fiber-Reinforced Lightweight Calcium Aluminate Cement-Based Concrete: Effect of Exposure to Elevated Temperatures(Mdpi, 2023) Bideci, Ozlem Salli; Yilmaz, Hakan; Gencel, Osman; Bideci, Alper; Comak, Bekir; Nodehi, Mehrab; Ozbakkaloglu, TogayCalcium aluminate cements (CACs) are a group of rapid-hardening hydraulic binders with a higher aluminum composition and lower ecological footprint compared to their ordinary Portland cement (CEM) counterparts. CACs are commonly known to have higher thermo-durability properties but have previously been observed to experience a major strength loss over time when exposed to thermal and humidity conditions due to the chemical conversion of their natural hydrated products. To address this, in this study, silica fume is added to induce a different hydration phase path suggested by previous studies and utilized in conjunction with fiber-reinforced lightweight pumice to produce lightweight concrete. To closely evaluate the performance of the produced samples with CAC compared to CEM, two different types of cement (CEM and CAC) with different proportions of pumice and crushed stone aggregate at temperatures between 200 and 1000 degrees C were tested. In this context, sieve analysis, bulk density, flowability, compressive and flexural strength, ultrasonic pulse velocity and weight loss of the different mixes were determined. The results of this study point to the better mechanical properties of CAC samples produced with pumice aggregates (compared to crushed stone) when samples are exposed to high temperatures. As a result, it is found that CACs perform better than CEM samples with lightweight pumice at elevated temperatures, showing the suitability of producing lightweight thermal-resistant CAC-based concretes.Öğe Fracture energy and mechanical characteristics of self-compacting concretes including waste bladder tyre(Elsevier Sci Ltd, 2017) Bideci, Alper; Öztürk, Hakan; Bideci, Özlem Sallı; Emiroğlu, MehmetManagement of solid wastes is one of the most important environmental problems in the world. Waste tyres are also one of these solid wastes. The growing number of waste tyres that are stocked every year brings problems in respect of human health, environmental pollution, and also causes esthetical problems. The main purpose of this study is to investigate the effect of waste tyre addition on self compacting concretes' mechanical characteristics and fracture properties under bending. In this study, waste bladder tyres (RA) mechanically cut in 25, 50 and 75 mm lengths were used by volumetric replacement of coarse aggregates in self-compacting concretes (SCC). Unit weight, flow, J-ring, column segregation, water absorption, 28 days of compressive strength, ultrasound pulse velocity and fracture energy tests were applied on concretes obtained by replacement of coarse aggregates in 5%, 10% and 15% ratios by volume. Also, Scanning Electronic Microscope (SEM) and Energy Distribution Spectroscopy (EDS) analyses of the samples were examined. In the study, it was determined that RA replacement decreases unit weight of fresh concrete; when RA length ratio increases, it becomes difficult for the concrete to pass through reinforcement openings; in hardened concrete samples dry unit weight decreases; 10% fibre addition increases compressive strength values; after the ultrasonic pulse velocity measurement, the concretes are included in "good" quality concrete classifications. As a conclusion, it was determined that 25 mm long 10% rubber aggregate replacement to self-compacting concretes can give optimum results. (C) 2017 Elsevier Ltd. All rights reserved.Öğe Geleneksel Evlerin Mimari Özelliklerinin İncelenmesi: Samsun-Havza Örneği(Duzce University, 2025) Kurt, Eda Nur; Bideci, AlperSamsun ilinin Havza ilçesi kültürel, sosyo-ekonomik ve mimari mirasını günümüze kadar koruyan ender yerleşim yerlerine ev sahipliği yapmaktadır. Bu yerleşim yerlerinin özellikleri kültürel miras olarak kabul edilmekte ve gelecek nesillere yol gösterici olması için korunması gerekmektedir. Bu kapsamda Bahçelievler ve Ilıca mahallelerinde yer alan 10 geleneksel ev üzerinde, her mahalleden kendine özgü yapım teknikleri ve malzeme kullanımını temsil eden beş ev seçilerek bir çalışma yapılmıştır. Son dönemdeki betonarme yapılar bu çalışmanın dışında tutulmuştur. Yerleşimlerin fiziki değerlendirmeleri yerinde incelemeler ve fotografik dokümantasyon yoluyla gerçekleştirilmiştir. Geleneksel evler, yapım teknikleri, malzemeleri ve yapısal koşulları açısından analiz edildi. Çalışmada mevcut mimari dokunun korunması ve geleneksel inşaat teknikleriyle mevcut koşulların iyileştirilmesinin önemli olduğu sonucuna varılmıştır.Öğe Geleneksel Konut Mimarisi: Düzce Derdin Köyü İncelemesi(Duzce University, 2024) Kaya, Sevda; Bideci, AlperKırsal yaşam, değişen gelişmeler ve yenilikler beraberinde, insanların beklentileri ve ihtiyaçlarının değişmesi sonucunda ekonomik, eğitim ve sağlık gibi nedenlerden şehirlere göçlerin artması ile hızla yok olmaktadır. Kırsal yaşamla birlikte geleneksel mimarinin ve konutların korunamama sorunları, yenilikçi malzemelerin ve yöntemlerin tercih edilmesi, geleneksel yapım inşaat maliyetlerinin artması, nitelikli ustanın bulunamaması, yöresel malzemeye ulaşımın zorlaşması, sürekli bakım gerektirmesi, yapıların terk edilmesi ve halkın gerekli bilinçte olmaması gibi nedenlerden dolayı artış göstermiştir. Düzce ili halihazırda birçok köyün bulunduğu ve köylerde kırsal yaşamın devam ettiği illerimizden biridir. Karadeniz bölgesinin batı kıyısında bulunan Düzce iline bağlı bir köy yerleşimi olan Derdin köyü 19. yüzyılda Osmanlı- Rus savaşı sonrası Abhazya'dan gelen Abhaza etnik grubu tarafından şehir merkezinin güneyinde kalan bir tepe noktaya kurulmuştur. Etrafı ormanlık alanlarla çevrili olan köy büyük bahçeleri ile dikkat çekmektedir ve doğa turizmi açısından önemli bir kırsal yerleşim yeridir. Yapılan çalışma kapsamında, Düzce ili kırsal yaşamı ve mimarisi hakkında örnek bir çalışma ortaya koymak ve gelecek nesillere kaybolmaya yüz tutmuş geleneksel evler hakkında yararlanabilecekleri bir kaynak oluşturmak amaçlanmıştır. Bu amaç doğrultusunda Derdin köyü çalışma alanı olarak seçilerek bu çalışma alanının kırsal yaşamı ve geleneksel yapıları köyde yaşayan halk ile konuşmalar sonucunda varılan bilgiler, çizimler, fotoğraflar ve analizler doğrultusunda aktarılmaya çalışılmıştır. Çalışma sonucunda, Derdin köyünde incelenen yapıların plan çözümleri, sofa tipleri, yapım aşamasında kullanılan farklı yöresel malzemeleri ve tercih edilen yapım teknikleri, cephelerinde nerelere dikkat edildiği, çatı tipleri ve üst örtü özellikleri, köye özgü özellikler olan farklı mimari unsurları, köy genelinde karşılaşılan yapılarda bozulmaları, ihtiyaçlardan doğan değişimleri ve korunma sorunları detaylı olarak ortaya konmuştur.Öğe Geri Dönüştürülmüş Lastik Atık İkameli Poliüretan Dolgulu Kompozit Panellerin Yaşam Döngüsü Değerlendirmesi(2018) Yılmaz, Emrah; Arslan, Hakan; Subaşı, Serkan; Uğur, Latif Onur; Bideci, AlperDünyanın daha sürdürülebilir bir yer olması ve gelecek nesillere daha temiz bir dünya bırakmak için, kompozitinşaat malzemelerinin çevresel etkilerinin azaltılması ile ilgili çalışmalar son zamanlarda artmaktadır. Buçalışmada, kompozit inşaat malzemelerinin çevresel etkilerini azaltmak ve endüstriyel atık kullanımının öneminiortaya koyabilmek için, 50 mm kalınlığındaki poliüretan dolgulu kompozit cephe paneline (PCP) %25 oranındageri dönüştürülmüş lastik atık ikame edilmiş ve bu panelin yaşam döngüsü değerlendirmesi yöntemi ile çevreselperformansı hesaplanmıştır. Çalışmanın sonucunda, poliüretan dolgulu kompozit panelinin çevresel etkisininazaltılması ve böylece daha sürdürülebilir bir kompozit panel üretimi için poliüretanın geri dönüştürülmüş lastikatık ile ikamesinin çevresel açıdan uygun bir seçenek olduğu belirlenmiştir.Öğe Granüle atık lastik agregası içeren kauçuk betonunun fiziksel özellikleri(2017) Bideci, Özlem Sallı; Saka, Rasim Cem; Bideci, AlperHer yıl yüz milyonlarca araç lastiği servis süresini doldurması nedeniyle atık olarak ortaya çıkmakta, bu durum sağlık ve çevre açısından küresel sorunlara neden olmaktadır. Günümüzde doğal inşaat kumunun az bulunan ve daha maliyetli bir malzeme haline gelmesi, doğal kuma göre daha ekonomik, sürdürülebilir olması beton teknolojisinde ince agrega olarak kullanımının yolunu açmıştır. Bu çalışmada, atık lastiklerden elde edilen kauçuk granül agrega (CRA), beton karışım dizaynında ince agreganın 1-2 mm elek aralığında kalan miktarına ağırlıkça %0 (Kontrol), %5, %10 ve %15 oranlarında ikame edilmiş ve numunelerin mekanik ve morfolojik özellikleri araştırılmıştır. Bu amaçla beton numunelerinin; birim ağırlık, su emme, 3, 7 ve 28 günlük basınç dayanımları, donma-çözünme (100 çevrim) ve ultrases deneyleri yapılmıştır. Ayrıca, numunelerin SEM (ScanningElectronMicroscope) görüntüleri ve EDS spektrum analizleri incelenmiştir. Çalışmanın sonucunda, %5 oranında CRA içeren numunenin diğer numunelere göre dahauygun sonuçlar verdiği belirlenmiştir.Öğe Internal structure examination of lightweight concrete produced with polymer-coated pumice aggregate(Elsevier Sci Ltd, 2013) Bideci, Alper; Gültekin, Ali Haydar; Yıldırım, Hasan; Oymael, Sabit; Bideci, Özlem SallıIn the construction sector, pumice is observed to be used in both structural and non-structural building elements. In this study, to produce a new kind of concrete, the aggregates are coated with three different polymers (Sonomeric1 : SNMC, KB Pur 214: KBP and Polipol3455: PLP) that have multiple uses. The mineralogical-petrographical features of both polymer-coated and uncoated aggregates were examined, and SEM (Scanning Electron Microscope) and XRD (X-ray Diffraction) analyses were performed. Moreover, in the study, lightweight concrete elements with different dosages (300, 400 and 500) were produced by using polymer-coated and uncoated aggregates; and their internal structure examinations were performed and compressive strength values of 3, 7 and 28 days samples were investigated. As a conclusion; among the aggregate samples, it was determined that PLP-coated aggregates have a more porous structure than the other polymer-coated aggregates and KBP-coated aggregates could be used in lightweight concrete (500 dosage) production. It was also concluded that the compressive strength values of lightweight concrete elements produced with coated samples increased even more. (C) 2013 Elsevier Ltd. All rights reserved.Öğe Lightweight aggregates coated with colemanite(Techno-Press, 2017) Bideci, Alper; Bideci, Özlem Sallı; Oymael, Sabit; Gültekin, Ali Haydar; Yıldırım, HasanTechnological advancements in the field of building materials are achieved day by day. In this study, a new lightweight concrete aggregate is produced by mixing certain rates of colemanite (0%, 7.5%, 12.5%, 17.5%), cement and coating the surface of pumice aggregate with this mixture. Thin aggregate sections are analyzed with specific gravity, unit weight, water absorption, impact, and crushing experiments. In this way, the production of cement and cement+colemanite coated lightweight concrete aggregates is investigated and an opinion on the likely behavior of these concrete types is provided.Öğe Mechanical and thermal properties of lightweight concrete produced with polyester-coated pumice aggregate(Elsevier Sci Ltd, 2023) Bideci, Alper; Bideci, Ozlem Salli; Ashour, AshrafWith the technological advances in the field of building materials, there has been an increasing focus on the research of lightweight concrete made with coated aggregates for improving the durability of concrete. In this study, pumice aggregates were coated with cast-based polyester to obtain polymer-coated pumice aggregates (PCPA). Lightweight concretes were produced with different cement dosages (200, 250 and 300) and PCPAs at different ratios (0%, 50% and 100%). Physical properties, mechanical strength, thermal properties and internal structure analysis (SEM-EDS) of the produced concrete samples were performed. According to the RILEM functional classification of lightweight concrete, the test results showed that REF D300 and REF D250 dosage series are in the semi-load-bearing lightweight concrete class, and the other all series are in the insulation concrete class, and the produced concretes can be classified as lightweight insulation materials. It can also be used in non-load-bearing walls or as an alternative lightweight insulation material.Öğe Öğütülmüş Cam Elyaf Takviyeli Beton (Grc) Atıklarının Çimento İkame Malzemesi Olarak Kullanılabilirliği(2018) Bideci, Özlem Sallı; Mercanoğlu, Kader; Bideci, AlperTabi kaynaklardan maksimum derecede faydalanabilmek amacıyla, ekonomik değeri olanmaddelerin geri dönüşümü ve tekrar kullanımı çok önemlidir. Bu çalışmada, cam elyaf takviyeli beton(GRC) atıklarının çimento ikame malzemesi olarak geri dönüşümünün sağlanabilmesi hedeflenmiştir.Ağırlıkça %0 (Referans), %5, %10 ve %15 oranında öğütülmüş GRC atıkları ile üretilen çimento harçnumuneleri üzerinde; taze harç deneylerinin yanı sıra, basınç dayanımı, eğilme dayanımı, ısıtma-yağmurve donma-çözülme deneyleri yapılmıştır. Yapılan deneysel çalışmalar sonucunda, %5 oranındaöğütülmüş GRC atıklarının tekrar harç içerisinde kullanılmasının çevre açısından olumlu katkısağlayacağı belirlenmiştir.Öğe Öğütülmüş Kolemanit Katkısının Çimento Harçlarına Etkisi(2018) Bideci, Özlem Sallı; Bideci, AlperBu çalışmada, öğütülmüş kolemanit katkısının çimento harç özelliklerine etkisi araştırılmıştır. Öncelikle öğütülmüş kolemanitin puzolanik aktivite özelliği belirlenmiştir. Daha sonra farklı oranlarda (%0, %1, %3, %5, %7) öğütülmüş kolemanit katkılı çimento harçlarının; özgül ağırlık, özgül yüzey, priz başlama ve sona erme süreleri tayini, kıvam ve genleşme deneylerinin yapılmasının yanı sıra harç numunelerin basınç dayanımı (2, 7 ve 28 günlük) belirlenerek referans numunesi ile karşılaştırılmıştır. Deney sonuçlarına göre, öğütülmüş kolemanit ikame oranının artışıyla priz başlangıç ve priz sona erme sürelerinin uzadığı, tüm çimento harçlarının TS EN 197-1 standardında istenilen en düşük mekanik özelliği sağladığı (42.5 MPa ve 62.5MPa) ve %1, %3 ve %5 oranında kolemanitin çimento ikame malzemesi olarak kullanılabileceği tespit edilmiştirÖğe PERFORMANCE STUDY ON CEMENTS(E-Journal of New World Sciences Academy, 2019) Oymael, Sabit; Bideci, Özlem Sallı; Bideci, AlperProtection of concrete against physical, chemical and mechanical effects is directly associated with the properties of materials mixed into its compound and mixture. Among them, cement has a distinctive role. When cement is investigated both as a compound of the concrete and the paste, it is quite significant in terms of durability, service life and aesthetics. The greatest problem of cement usages is cracks negatively affecting both the subjective properties and the properties of aggregate used with it. The type and amount of cement used in a concrete, physical and chemical properties, hydration process, mixing method and technique, its relation with aggregate and water and additives depending on the time factor, have an effect both on functionality and visual performance. In this study, key words such as adherence, workability and cracking were taken into the center by dwelling on the cement subject, and the possible problems were offered a solution in terms of cause and effect relationship.Öğe Permeability features of concretes produced with aggregates coated with colemanite(Techno-Press, 2015) Bideci, Özlem Sallı; Bideci, Alper; Oymael, Sabit; Gültekin, Ali Haydar; Yıldırım, HasanIn the world total boron reserve rating, Turkey is taken place on the first rank, meeting the demand of refined mineral and main boron chemicals. Development of the new boron products and production technologies, spreading the using area of the boron are the study topics which must be finically discussed. In this study, with the help of colemanite taken in ratio as (0%, 7.5%, 12.5%, and 17.5%) by being mixed by the cement, surfaces of the pumice aggregates have been covered. Permeability of the samples has been investigated by producing lightweight concrete with 400 dose with the help of aggregates covered with colemanite. For this, the experiments of water absorption, capillary water absorption, depth of penetration of water under pressure and rapid chloride permeability have been performed. In addition, analyses of the thin section of covered and uncovered pumice aggregates and SEM (Scanning Electron Microscope) have been investigated. When the control samples produced with the covered aggregates and concretes produced with colemanite covered aggregates are compared each other, it has been determined that special lightweight concretes whose values of capillary water absorption experiment, depth of penetration of water under pressure experiment and rapid chloride permeability are low can be produced.
