Combined effect of fine fly ash and packing density on the properties of high performance concrete: An experimental approach

Elrahman, Mohamed Abd; Hillemeier, Bernd

doi:10.1016/j.conbuildmat.2014.02.024

Cited by 75 publications

(26 citation statements)

References 15 publications

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“…For this purpose, increasing the lightweight aggregate content, which is the lightest component in the concrete mixture, is a good option to reduce the material density; this can be achieved by applying a dense packing concept without a negative effect on the material properties. The idea of this concept is that if a large volume of aggregate can be efficiently packed in a certain volume, then the gaps between the aggregates can be minimized, and thereby the required paste to fill the gaps is considerably decreased [27]. In this study, LWC mixture proportions are selected based on the granular optimization of solid materials by means of the Andreasen and Andersen model [20] as:…”

Section: Design Methodologymentioning

confidence: 99%

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

2017

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Lightweight aggregate concrete is a material with very low density and good thermal insulation, and several types of lightweight aggregates have been used for lightweight concrete. Since the characteristics of lightweight aggregates strongly affect the properties of lightweight concrete, a proper consideration for the use of lightweight aggregate is very important for development of lightweight materials. In particular, the sizes and spatial distributions of lightweight aggregates can influence the material responses of lightweight concrete, such as compressive strength and thermal conductivity. In this study, different types of gradings of lightweight aggregates are adopted to investigate the effect of gradings on the material properties. Liaver R , an expanded glass granulate, is used as a lightweight aggregate for the specimens. Virtual models of the lightweight specimens with different gradings are numerically generated, and both mechanical and thermal properties are evaluated using experimental and numerical approaches for more detailed investigation. The obtained results can be utilized to suggest an optimal grading that satisfies both the mechanical and thermal properties of lightweight concrete specimen.

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Section: Design Methodologymentioning

confidence: 99%

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

2017

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“…Ancak %15 ve 20 SD durumlarında BSG değerleri artmıştır. PÇ ile SD'nın ağırlıkça %10 yer değiştirmesi durumunda, BSG değerinin kontrol numunesine kıyasla azaldığı Elrahman ve Hillemeier [8] tarafından da bulunmuştur. Ziari ve ark.…”

Section: Bulgular Ve Tartışmalarunclassified

“…[7], Portland çimentosu ile UK'nin ağırlıkça %20 yer değiştirdiği normal betonlarda, su işleme derinliğinin salt Portland çimentosuyla üretilmiş kontrol numunesine kıyasla daha büyük olduğunu ileri sürmüşlerdir. Elrahman ve Hillemeier [8], yüksek performanslı betonlarda, SD ve UK'nin BSG derinliğine etkisini araştırmışlardır. Portland çimentosu ile UK'nin ağırlıkça %30 yer değiştirmesi durumunda, su işleme derinliğinin kontrol numunesiyle (Portland çimentosu) aynı olduğunu bulmuşlardır.…”

Section: Introductionunclassified

Kendiliğinden Yerleşen Harçlarda Portland Çimentosu, Silis Dumanı, Uçucu Kül Kombinezonlarının Basınçlı Su Geçirgenliğine Etkisi

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Türk

Çekilmez³

2019

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Su depolarında, baraj yapılarında, bazı endüstriyel binaların yapımında ve onarımında kullanılan beton ve harçların, basınçlı su geçirgenliği değeri dayanıklılık bakımından büyük öneme sahiptir. Bu çalışmada, Portland çimentosu, silis dumanı ve uçucu kül içeren ikili ve üçlü kendiliğinden yerleşen harçlarda ve bunların kombinezonlarından oluşan numunelerde basınçlı su geçirgenliği araştırılmıştır. Bu örneklerde basınçlı su işleme derinliği belirlenmiştir. Portland çimentosu ve %10 silis dumanı içeren ikili numunede, Portland çimentosu, %10 silis dumanı ve %35 uçucu kül içeren üçlü numunede basınçlı su geçirgenliği değerleri azaltılmıştır.Anahtar kelimeler: Kendiliğinden yerleşen harç, silis dumanı, uçucu kül, basınçlı su geçirgenliği. Abstract:The water permeability has great importance with respect to durability for concrete structures subjected to pressure and mortars used in construction and repair of water tanks, dam structures, and some industrial buildings. In this work, the water permeability under pressure was investigated in binary and ternary self-compacting mortars with Portland cement, silica fume and fly ash, and at their combinations. Water penetration depths were determined in these samples. The water penetration depths were decreased in the binary sample containing Portland cement and 10% silica fume, and the ternary sample containing Portland cement, 10% silica fume and 35% fly ash.

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“…[20][21][22][23][24][25][26]. The studies show that these inclusions not only improve the packing of particles but also produce crack bridging phenomena by densifying the nanostructures [18,27]. Nano particles control the C-S-H reaction and improves the concrete durability [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers have explained that the properties of cement and concrete composites may greatly be modified by using nano and micro sized particle inclusions in the matrix [5][6][7][8][9][10][11][12]. The nano level inclusions in concrete have shown improved durability, mechanical strength, porosity reduction and economical construction [13][14][15][16][17][18][19]. The nano metric inclusions includes nano silica, graphene, multi walled carbon nano tubes (MWCNTs), nano CaCO3, nano TiO2 etc.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes

Khitab

Ahmad

Khushnood

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. Cement and concrete composites are inherently brittle and exhibit very less tensile/flexural strength capacity as compared to their compressive strength. Use of thoroughly dispersed carbon nanotubes in the concrete matrix is one of the possible solution for enhancing mechanical properties in tension/flexure. In the present research work, small fractions of multiwall carbon nanotube (MWCNTs) i.e. 0.05 and 0.10 wt% of cement have been integrated into the cement concrete to study their effect on the mechanical properties of the resultant concrete mixtures. The enhanced performance of the whole mix lies on a single point that MWCNTs must be thoroughly disperse in the mixture. Hence, special arrangement through usage of high energy sonication along with amended acrylic based polymer (performing as a surfactant) was made to have a uniform dispersion of MWCNTs in the concrete mix. The testing of concrete samples includes i.e., flexure, splitting tensile and compressive strengths after 3, 7, 28 and 56 days of curing. After having comparison with the control mix cured for 28 days, it was observed that the addition of 0.05 wt% MWCNTs increased the splitting A. Khitab et alii, Frattura ed Integrità Strutturale, 42 (2017) [238][239][240][241][242][243][244][245][246][247][248] 240 tensile strength by 20.58%, flexural strength by 26.29% and compressive strength by 15.60%. Through above results, which verify the increase in concrete mix strength after adding MWCNTs, these MWCNTs may be incorporated in the treatment of Nano/micro cracks completed through process of connecting, branching and pinning. Similarly, as proved in threepoint bending tests, MWCNTs also enhances the breaking strains as well as the fracture energy of the concrete mixes, besides, imparting increase to the strength. The investigations have shown that incorporating lesser amounts of MWCNTs i.e., 0.05 and 0.10 wt% of cement to the concrete mixes after insuring there complete dispersion, unusually improve their properties like mechanical strengths and fracture behavior.

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Combined effect of fine fly ash and packing density on the properties of high performance concrete: An experimental approach

Cited by 75 publications

References 15 publications

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

Kendiliğinden Yerleşen Harçlarda Portland Çimentosu, Silis Dumanı, Uçucu Kül Kombinezonlarının Basınçlı Su Geçirgenliğine Etkisi

Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes

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