Identifying the bond and abrasion behavior of alkali activated concretes by central composite design method

Balçıkanlı, Müzeyyen; Türker, Hakan; Özbay, Erdoğan; Karahan, Okan; Atiş, Cengiz Duran

doi:10.1016/j.conbuildmat.2016.10.034

Cited by 15 publications

(8 citation statements)

References 39 publications

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“…The flow chart of reliability analysis with MERSM is shown in Figure 2. Based on this flow chart, the basic thought of MERSM on dynamic reliability analysis is summarized as follows: Establish finite element model, set dynamic loads, initial boundary conditions and constrains, and give time domain [0, t ] as well. Reasonably select random input variables and confirm their distribution characteristics. Find the extremum values of multi-object analyses as output responses in time domain [0, t ] by the dynamic deterministic analysis of structure with multi-failure modes based on finite element model. Extract samples of random input variables by using the central composite design method 15 (the basic thought of central composite design is shown in Figure 3), and then compute the samples of output responses in [0, t ]. Build multiple extremum response surface models with the samples of random input variables and output responses by least square method. 16,17 The dynamic comprehensive reliability analysis of multi-failure modes is obtained by simulating multi-extremum response surface models by using linkage Monte Carlo (MC) method.…”

Section: Multi-extremum Response Surface Methodsmentioning

confidence: 99%

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Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Yang

Fei

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study develops multi-extremum response surface method (MERSM) for the probabilistic analysis of aeroengine turbine blisk with the coexistence of many failure modes by considering two-way fluid-thermal-solid coupling under complex working condition. The mathematical model of MERSM was established with respect to the random input variables of inlet temperature, inlet velocity, density of material, and rotor speed, and the output responses of the maximum values of deformation, stress, and strain. The comprehensive probabilistic analysis of turbine blisk was completed based on MERSM. The results demonstrate that the comprehensive reliability degree of turbine blisk is 0.9944 when the allowable deformation, stress, and strain are 2.6 × 10−3 m, 1.26 × 109 Pa, and 6.75 × 10−3 m/m, respectively. The main factors influencing the comprehensive reliability degree of turbine blisk are rotor speed and gas temperature. The secondary factors are inlet velocity and density of material. As revealed from the comparison of methods, MERSM improves the computational speed and efficiency with the guarantee of accuracy. The efforts of this paper provide a promising approach for the nonlinear transient reliability analysis of complex structures with multi-failure modes and two-way fluid-thermal-solid coupling.

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Section: Multi-extremum Response Surface Methodsmentioning

confidence: 99%

“…Extract samples of random input variables by using the central composite design method 15 (the basic thought of central composite design is shown in Figure 3), and then compute the samples of output responses in [0, t ].…”

Section: Multi-extremum Response Surface Methodsmentioning

confidence: 99%

Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Yang

Fei

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In the work of Balcikanli et al (2017), the bond strength of alkali-activated (also called geopolymer) concretes with deformed reinforcing bars were examined experimentally by using the central composite design method. The relationship between the bond strengths from pullout test of deformed bars and the compressive strength is defined by the equation below.…”

Section: Adhesive Bond Strength Of Deformed Bars With Gpcmentioning

confidence: 99%

“…Bond strengths of steel bars with GPCs that were produced from fly ash, metakaolin, rice husk ash or in combination with other alumino silicate raw materials were comparable to those of OPCC (Cui et al 2017; Kim and Park 2015; Castel and Foster 2015). Balcikanli et al (2017) studied the bond and abrasion behaviour of alkali-activated concrete (AAC) by central composite design method and concluded that increasing the sodium concentration increased the compressive strength, bond strength and abrasion resistance. However, studies on GPCs in which adhesive bond strength of surface-polished smooth bar's bond with concrete is the main focus are very scarce.…”

Section: Introductionmentioning

confidence: 99%

Adhesive Bond Strength of Steel Bars Embedded in Fly Ash-GGBS-based Geopolymer Concrete

Chinapaiya

Parshwanath

Radhakrishnan

et al. 2020

ACT

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The bond behaviour of plain rebars embedded in ambient cured geopolymer concrete (GPC) prepared with a mix of fly ash and ground granulated blast furnace slag (4:1 by mass) was studied to evaluate the adhesive bond between these rebars and concrete. As GPC is an inorganic polymer concrete, the adhesive bond strength of concrete is evaluated for its suitability to reinforced concrete applications. Pull-out tests were conducted to measure the slip of the applied load. Diameters of the embedded bars were varied as 12, 16 and 20 mm, providing compressive strengths of 39 to 68 MPa. Chemical adhesion occurs between the bar and concrete as the bar surface is polished. We observed a gain in adhesive bond stress as bar diameter is increased. The bond stress-slip curves of GPC and ordinary Portland cement concrete were different and the peak bond stress was about 70% higher in GPC. Regression analysis showed that the adhesive bond strength in GPC is about one-fourth of the bond strength of the deformed rebars. Higher bond strength in GPC is due to chemical bonding and formation of both sodium aluminosilicate hydrate and calcium aluminosilicate hydrate gels besides the denser interface as seen from scanning electron microscopy and the ordering of silicon and aluminium as identified in MAS-NMR.

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“…Dayanım mekanizmasında kür sıcaklığı, kür süresi, kömürün yanmasına bağlı olarak bağlayıcı kalitesi, bağlayıcı içeriği, agrega cinsi, su miktarı, aktivatör oranı, aktivatör cinsi, kür şartları gibi unsurlar önemlidir [20,[32][33][34]. Geopolimer betonlar geleneksel betonlara kıyasla, erken ve yüksek dayanım, yüksek sıcaklık, donma-çözülme, ıslanma-kurumaya ve aşınma karşı daha dirençli olup, daha düşük kuruma büzülmesi gösterirler [20,24,[35][36]. Buna karşılık bazı çalışmalarda asit ve sülfatlara karşı dirençleri geleneksel betonlardan daha düşük olduğunu belirtilmektedir [37].…”

Section: Introductionunclassified

Yüksek ve Düşük Kalsiyum İçeren Uçucu Küller ile Üretilen Geopolimer Harçların Fiziksel ve Mekanik Özelliklerinin İncelenmesi

Kaya¹

2020

Türk Doğa Ve Fen Dergisi

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Bu çalışmada, C sınıfı ve F sınıfı uçucu külün birlikte kullanılarak geri dönüşümlerinin sağlanması ve ekonomiye kazandırılması amacıyla üretilen geopolimer harçların fiziksel ve mekanik özellikleri incelenmiştir. C sınıfı uçucu kül (UK) ile F sınıfı UK 'nın %0,%10, %20, %30, %40 ve %50 oranlarında birbirleri ile yer değiştirilmesi ile oluşturulan bağlayıcı, sodyum hidroksit (NaOH) ve potasyum hidroksit (KOH) ile ayrı ayrı aktive edilmiştir. Aktivatör/bağlayıcı oranı %10 olarak kullanılmıştır. Likit/bağlayıcı oranı 0,35, agrega/bağlayıcı oranı 3 olarak belirlenmiştir. UK, kum, aktivatör ve suyun standart çimento mikserinde karıştırılması ile hazırlanan harç numuneler, 40mm×40mm×160 mm boyutlu standart kalıplara yerleştirildikten sonra 100 °C' de 24 saat süre ile aktivasyon sıcaklığına maruz bırakılmıştır. Daha sonra numuneler 28 gün boyunca hava kürüne (22±2°C) tabi tutulmuşlardır. Hava kürünü takiben fiziksel ve mekanik deneyler gerçekleştirilmiştir. Sonuç olarak %60 C sınıfı ve %40 F sınıfı UK içeren ve NaOH ile üretilen numunelerde 3,8 MPa eğilme dayanımı, 28 MPa basınç dayanımı elde edilmiştir.

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Identifying the bond and abrasion behavior of alkali activated concretes by central composite design method

Cited by 15 publications

References 39 publications

Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Adhesive Bond Strength of Steel Bars Embedded in Fly Ash-GGBS-based Geopolymer Concrete

Yüksek ve Düşük Kalsiyum İçeren Uçucu Küller ile Üretilen Geopolimer Harçların Fiziksel ve Mekanik Özelliklerinin İncelenmesi

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