Ugur Durak

• PHD
• Erciyes University

This study aims to investigate the influence of substituting silica fume with fly ash in fly ash-based geopolymer mortars. The replacement ratios of silica fume were 2%, 4%, 6%, 8%, and 10% on a mass basis with fly ash. The NaOH was used as an alkali activator. The produced geopolymer mortars were heat cured at a temperature of 75 °C for various du...

This research demonstrates the potential of diatomite as a fly ash replacement to improve mechanical properties and environmental sustainability and presents it as a viable alternative for sustainable construction. Additionally, a life cycle assessment (LCA) was conducted on the produced mortars to quantitatively compare their environmental impacts...

Various industrial wastes and natural resources are used as precursors in the production of geopolymers, which are known to be more environmentally friendly compared to Portland cement. In this study, kaolin, which is a natural resource, and Fly ash (FA), which is an industrial waste, were used as precursors. In this study, the influence of FA subs...

The potential use of waste-expanded polystyrene (EPS) beads in the production of lightweight screed mortar (LSM) was investigated. LSM specimens were produced by replacing waste EPS with normal weight aggregate at 20%, 40%, 60%, 80%, and 100% proportions by volume. Workability, unit weight, capillarity, flexural and compressive strength, abrasion r...

In this study the mitigation influence of incorporating waste glass powder (G) and class F fly ash (F) in mortar as partial cement replacement on the alkali-silica reaction (ASR) between reactive aggregate and alkali contents of cement were investigated. Waste G and F replaced cement separately and together on mass basis at 10%, 20%, and 30%. The u...

In this study the mitigation influence of incorporating waste glass powder (G) and class F fly ash (F) in mortar as partial cement replacement on the alkali-silica reaction (ASR) between reactive aggregate and alkali contents of cement were investigated. Waste G and F replaced cement separately and together on mass basis at 10%, 20%, and 30%. The u...

This paper shows results of laboratory study on the effects of nano-SiO2 on Portland cement-fly ash systems. It is aimed to improve performance of fly ash–cement systems, particularly at early age, with the inclusion of nano-SiO2. In order to observe the effects of nano-SiO2 particles on the strength and hydration kinetics of fly ash blended cement...

Bu çalışmada, atık genleştirilmiş polistiren (EPS) agregası dere kumu ile yer değiştirerek yüksek dayanımlı hafif şap harçları üretilmiştir. Kaplama ve tesviye amacı ile kullanılan şap harçlarında, atık EPS kullanarak harçların birim hacim ağırlığının azaltılması, ısıl performanslarının arttırılması hedeflenmiştir. Bu amaçla, bir grup geleneksel şa...

It is known that studies on lightweight geopolymer using fly ash need more research. Therefore, in this study, class F fly ash-based lightweight geopolymer mortar samples were produced by using river sand, raw perlite, and expanded perlite as aggregates. The study was planned in two groups. In the first group, river sand, raw perlite, and expanded...

Bu çalışmada alkali ile aktive edilmiş yüksek fırın cürufu ve uçucu kül içeren harçların dayanım özelliklerine yüksek sıcaklık sonrası hava kürü koşullarının etkisi araştırılmıştır. Bu amaçla uçucu kül %0, %25, %50, %75, %100 oranlarında yüksek fırın cürufu ile ikame edilerek alkali ile aktive edilmiş harçlar üretilmiştir. Harçlarda aktivatör olara...

In this study, in order to observe the mechanical and physical properties of normal screed, sandy-lightweight screed and lightweight screed samples, expanded polystyrene (EPS) was used as fine aggregate and lightweight screed systems was produced by replacing sand at 100%, 50% and 0% by weight. Samples of cement dosages of 250, 300, 350 kg/m3 were...

In this study, 1, 2, and 3% micronized aluminum powder were used by replacing with fly ash to improve the properties of F class fly ash-based geopolymer mortar samples. The produced geopolymer mortar samples were heat cured at 60, 70, and 80 °C temperatures for 24 and 48 h. Following heat curing, the unit weights, flexural, and compressive strength...

In this study, the use of waste polyurethane released after industrial processing in light mortar production has been investigated. Lightweight mortar samples were produced using EPS (Expanded polystyren foam) and waste polyurethane, which are currently used in lightweight mortar production. The produced samples were compared according to their equ...

There are very few studies in the literature on the usage of CKD in cementitious systems. This article presents the laboratory study results on the influence of cement kiln dust (CKD) on the properties of mortar made with cement kiln dust and Portland cement. The article aims to prevent CKD’s (known as a hazardous waste product) damage to nature by...

This study investigated the mechanical properties and microstructure of geopolymer mortar samples exposed to short-term high-temperature heat curing. Fly ash was used as the main binder and sodium hydroxide as an activator in the geopolymer mortar samples produced within the context of the study. The produced mortar samples were cured at 100, 200,...

In this study, the determination of flexural tensile strength of concrete kerbstone is investigated. Currently, the flexural tensile strength of concrete kerbstone is determined using simple bending formula. However, due to the unsymmetrical cross-section of kerbstone, the bending take place on the section of kerbstone is not simple bending but bi-...

It is known that nano-and microparticles have been very popular in recent years since their advantages. However, due to the very small size of such materials, they have very high tendency to agglomeration particularly for nanoparticles. Therefore, it is critical that they are properly distributed in the system to which they are added. This paper in...

Bu çalışmada uçucu kül ve yüksek fırın cürufu kullanılarak üretilen geopolimer harç numunelerde atık demir tozu kullanımı araştırılmıştır. Çalışmada atık demir tozları agrega ile ağırlıkça %10, %20 ve %30 oranlarında yer değiştirilerek kullanılmıştır. Uçucu kül ile üretilen harç numunelerde aktivatör olarak sodyum hidroksit kullanılmış ve numuneler...

Bu çalışmada alkali ile aktive edilmiş cüruflu harçlarda ırmak kumu ile EPS ikame edilerek hafif harç numuneleri üretilmiştir. EPS granülleri ırmak kumu ile hacimce %20, %40, %60, %80, %100 oranlarında yer değiştirilerek karışıma dâhil edilmiştir. Çalışmada aktivatör olarak sodyum silikat kullanılmış ve üretilen numuneler 28 gün suda kür edilmiştir...

In this study, the strength development of geopolymer mortar specimens subjected to the prerest period was investigated under the effect of microwave (MW) curing. In the study, in the production of geopolymer mortar samples, NaOH as an activator and F class fly ash as a binder were used and prismatic samples of 40x40x160mm were produced. The sand-b...

In this study, blast furnace slag geopolymer mortars were prepared in prism molds with the size of 4 x 4 x 16 cm by alkali activating powdered sodium meta silicate (Na2SiO3). The mortar mixtures prepared to contain sodium in different proportions were cured with 3 different curing methods, and 300 cycles of freeze-thaw were applied, and strength an...

In this study, the influence of a pre-rest period before heat curing (as a new parameter), on the physical properties, flexural and compressive strength, and microstructure of geopolymer mortars and pastes produced with alkali activation of fly ash were investigated. In this context, geopolymer mortar and paste samples were prepared and pre-rested...

The influence of nano SiO2(NS) and CaCO3(NC) particles on the properties of class F fly ash based geopolymer mortar activated with different sodium ion concentrations have been investigated. Mortar mixture proportions were 1:3:0.3 for binder, sand, and water, respectively. Nano SiO2 and CaCO3 particles were replaced with a binder by weight basis at...

This study presents the resistance of sodium meta-silicate activated ground granulated blast furnace slag (GGBFS) to acidic and basic mediums. Geopolymer mortars were prepared with GGBFS activated by sodium meta-silicate activator having 4, 8, and 12% sodium concentrations by mass of slag. These mortars were exposed to two types of acid solutions,...

In this study, some durability properties of alkali-activated slag (geopolymer) mortars were investigated. In determining these durability properties, a series of test procedures such as high temperature, abrasion, rapid chloride permeability and wetting and drying cycles were performed. For the slag activation, sodium metasilicate was used at thre...

The demand for cement usage increases in the world, currently. It is known that using industrial waste materials in concrete as cement or aggregate replacement as part of waste management as well as conserving natural resources is getting wider. Due to these facts, in this work, an investigation was carried out on the utilization of waste marble po...

Behaviour of construction materials i.e. steel, concrete and mortar under elevated temperature is important. In the study, the variations in mass loss, and strengths of polypropylene fiber reinforced mortar subjected to elevated temperatures were examined. Mortar was made with CEM I 42.5R Portland cement, monofilament polypropylene fiber, fine aggr...

The influence of nano SiO2 particles for different sodium ion concentrations on fly ash based geopolymer mortar have been investigated in this study. This was achieved by measuring flexural and compressive strength of fly ash based geopolymer mortar. In the scope of this study, class F fly ash was used and samples were produced in dimensions of 40x...

Bu çalışmada NaOH ile aktive edilmiş uçucu kül ile üretilen geopolimer harç numunelere nano SiO2 ve nano CaCO3 ilavesinin eğilme ve basınç dayanımı üzerindeki etkisi araştırılmıştır. Çalışma kapsamında F sınıfı uçucu kül kullanılmış ve 40x40x160 mm boyutlarında numuneler üretilmiştir. Harç karışımları için kum-bağlayıcı oranı 3, su-bağlayıcı oranı...

The influence of incubation period of fly ash based NaOH and heat activated geopolymer on strength development was evaluated. This is achieved by measuring flexural and compressive strength of fly ash based geopolymer mortar. Geopolymer mortar samples were incubated for different time interval before subjecting the samples to heat curing at 75 °C d...