Compressive strength, water absorption, water sorptivity and surface radon exhalation rate of silica fume and fly ash based mortar

Hatungimana, Daniel; Taşköprü, Caner; İçhedef, Mutlu; Saç, Müslim Murat; Yazıcı, Şemsi

doi:10.1016/j.jobe.2019.01.011

Cited by 82 publications

(35 citation statements)

References 36 publications

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“…8(a)]; FAC showed a more linear trend as a function of the square root of exposure time. These trends are consistent with those reported in previous studies (Gopalan 1996;Tasdemir 2003;Leung et al 2016;Hatungimana et al 2019;Jena and Panda 2021). The morphology of calcium silicate hydrate (C-S-H), a major hydrate in cement-based materials and a source of strength in concrete, can be changed by changing the calcium silicate (Ca/Si) atomic ratios (Richardson 1999(Richardson , 2004Richardson et al 2010).…”

Section: Resultssupporting

confidence: 91%

Water Uptake in OPC and FAC Mortars under Different Temperature Conditions

Kiran

Samouh

Matsuda

et al. 2021

ACT

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This experimental and numerical study aims to evaluate the penetration depth of contaminated water in the concrete structures involved in the Fukushima Daiichi nuclear powerplant. The influence of the mortar mixture on water absorption was investigated by varying the composition: mortars containing aggregates from river sand and crushed limestone sand were compared, and 15% of the cement in the mixture was substituted with fly ash. The effect of temperature in nuclear conditions is also significant; therefore, water uptake at temperatures of 20 and 60°C was considered. Finally, pre-drying conditions were studied by drying the sample at two different conditions: at 105°C and at 40% RH (relative humidity) and 20°C. Water uptake was monitored using x-ray computed radiography in combination with mass measurements. In all cases, anomalous sorption, or a nonlinear relationship between penetration depth and the square root of exposure time was observed, with the sorption curves showing bimodal behavior. The aggregate type had no significant effect on the water uptake results. However, the samples containing fly ash clearly had lower water uptake rates, which can be explained by the differences in the calcium silicate hydrate (C-S-H) structures. With increasing temperature, the penetration was slightly accelerated at the beginning of the experiment, with the rate of penetration then decreasing rapidly. The densification of C-S-H at higher temperatures could contribute to this phenomenon. Microstructural rearrangements can also explain why the highest uptake rates occurred for samples that were exposed to severe drying conditions (105°C). The experimental results were consistent when the microstructural rearrangement was considered, further confirming these conclusions.

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Section: Resultssupporting

confidence: 91%

Water Uptake in OPC and FAC Mortars under Different Temperature Conditions

Kiran

Samouh

Matsuda

et al. 2021

ACT

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“…The calcium hydroxide formed the interfacial transition zone around aggregates reduces the bond strength between aggregate and cement paste. Therefore, eliminating calcium hydroxide by forming additional CSH increases the binder amount and thus enhanced compressive strength [12] .…”

Section: Figurementioning

confidence: 99%

“…The low sorptivity value is because silica fume and fly ash have smaller particles than cement. It is about a thousand times smaller, making concrete has less pore, which leads to low sorptivity, so the water infiltration is not as many as the normal concrete has [12][13][14] .…”

Section: Figurementioning

confidence: 99%

Investigation of Water Absorption for Concrete Using Supplementary Materials

Ghewa¹,

Suprobo²,

Irawan³

et al. 2020

JTS

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Concrete's durability is the key factor that affects the service life of the concrete structure. One factor that affects the durability properties of concrete is its pore structure, which can be investigated by analyzing the materials' absorption rate. For the structures with direct contact with water, water absorption can change the pore structure's behavior, affecting the durability of the conc in the long term rate. It is important to research to find the water absorption properties of concrete with different mixtures.This research investigates the rate of absorption of concrete by using fly ash and silica fume. Based on secondary absorption properties, the result shows that 15% fly ash in normal concrete increases the resistance to water penetration by 23%. The usage of 5% Silica Fume increases the resistance by 11.8%. The usage of 5% silica fume + 10% fly ash increases the resistance by 16.2%. It shows that the use of supplementary materials in concrete increases the resistance of water penetration. In this research, the usage of 15% fly ash as cement replacement shows the best result.

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“…Uçucu kül, yüksek fırın cürufu, silis dumanı ve pirinç kabuğu külü gibi atık ürünler sektörde ağırlıklı olarak kullanılmaktadır [3,9,10].Uçucu kül ve silis dumanı ile yapılan bir çalışmada 90. günde uçucu külün %5, silis dumanının ise %15 oranında çimentoya ikamesi ile kontrol karışımdan daha yüksek bir basınç dayanımı elde edilmiştir [11]. Başka bir çalışmada ise3 tip farklı pirinç kabuğu külü (Kül-1, Kül-2 ve Kül-3) %10 ve %20 oranlarda çimento yerine beton üretiminde kullanılmıştır.…”

Section: Introductionunclassified

Evaluation of Tea Industrial Waste Ashes in Concrete Production

Kara

2020

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Çay fabrikalarında, çay üretimi sırasında gerekli olan buhar temini için yakıt olarak kömür kullanılmaktadır. Buhar gereksinimindeki enerjinin sağlanması için kullanılan kömürün yanması ile tabanda cüruf atığı ve kuru tip toz siklon filtre sisteminde atık kül oluşmaktadır. Cüruf atığının yollarda dolgu malzemesi olarak değerlendirildiği bilinmektedir. Ancak, filtre sisteminde biriken atığın oldukça ince bir yapıya sahip olduğu ve aktif olarak değerlendirildiği bir kullanım alanının bulunmadığı tespit edilmiştir. Atıkların zararlı etkilerinin bertaraf edilmesi, depolama sorunlarının giderilmesi endüstrilerde önemli sorunların başında gelmektedir. İnsan sağlığına zararları bulunmayan endüstriyel atıkların beton üretiminde kullanılabilirliğinin değerlendirilmesi çevre ve depolama sorunlarını ortadan kaldıracağı gibi kısıtlı olan doğal kaynakların kullanımını da azaltacaktır. Bu çalışmada çay fabrikası atık külünün beton üretiminde değerlendirilmesine yönelik olarak atık malzeme %0 (Referans), %5, %10 ve %15 oranlarda çimentoya ağırlıkça ikame edilmiştir. Atık küllerin ikamesi ile hazırlanan taze betonların çökme miktarı ölçülerek kalıplara yerleştirilmiştir. Kül ikamesi ile üretilen beton numuneler 7, 28 ve 90 gün standart kür edilmişlerdir. Sertleşmiş beton numuneleri üzerinde fiziksel ve mekanik deneyler gerçekleştirilmiştir. Sonuç olarak, atık külün çalışmada kullanılan miktarlarda beton üretiminde çimento ikame malzemesi olarak değerlendirilebileceği belirlenmiştir.

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Compressive strength, water absorption, water sorptivity and surface radon exhalation rate of silica fume and fly ash based mortar

Cited by 82 publications

References 36 publications

Water Uptake in OPC and FAC Mortars under Different Temperature Conditions

Water Uptake in OPC and FAC Mortars under Different Temperature Conditions

Investigation of Water Absorption for Concrete Using Supplementary Materials

Evaluation of Tea Industrial Waste Ashes in Concrete Production

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