Effect of fly ash and slag on properties of normal and high strength concrete including fracture energy by wedge splitting test: Experimental and numerical investigations

Al-Yousuf, Ayad; Pokharel, Tilak; Lee, Jessey; Gad, Emad; Abdouka, Kamiran; Sanjayan, Jay

doi:10.1016/j.conbuildmat.2020.121553

Cited by 24 publications

(8 citation statements)

References 14 publications

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“…Despite not being unanimous, a satisfactory definition for the HPC is that this concrete presents a compressive strength equivalent to the HSC, that is, f ck above 50 or 55 MPa [ 2 , 14 ], but presents a workability equivalent to self-compacting concrete (SCC), that is, a spread between 455 to 810 mm by the slump-flow test [ 1 , 15 , 16 ]. Regarding the water/binder factor (w/b), some authors suggest that this factor should be less than 0.40 [ 17 , 18 , 19 ], contrary to what is observed in conventional concretes, where the w/b factor ranges from 0.45 to 0.65 [ 20 , 21 , 22 ]. Regarding cement consumption, it is usual for it to be between 400 to 700 kg/m 3 [ 23 , 24 , 25 , 26 ], while for CC, the cement consumption is usually between 260 to 380 kg/m 3 [ 25 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

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Section: Introductionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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“…On the one hand, the spherical vitreous particles in fly ash can help cement particles to disperse evenly and expand the hydration space of cement, thus promoting hydration reaction [ 31 ]. On the other hand, the active SiO 2 and Al 2 O 3 in fly ash and slag can react with Ca(OH) 2 in the presence of water and produced calcium silicate hydrate and calcium sulphoaluminate hydrate, resulting in the consumption of Ca(OH) 2 and the promotion of the hydration reaction [ 32 ]. After 14 d of curing, the strengths of the concretes still increased even though they were exposed to the environment of low humidity and large temperature variation.…”

Section: Resultsmentioning

confidence: 99%

“…The variation of fracture energy of the four types of concretes with curing age was shown in Figure 7 . At the curing age of 3 d, the fracture energies of the concretes with mineral admixtures were slightly higher than the OC concrete, resulting from fly ash and slag filling the pores and improving the interface transition zone (ITZ) of the concrete [ 32 ]. After 3 d, the fracture energies of all concretes continued to increase.…”

Section: Resultsmentioning

confidence: 99%

Early-Age Mechanical Characteristics and Microstructure of Concrete Containing Mineral Admixtures under the Environment of Low Humidity and Large Temperature Variation

Guo

Zhang

et al. 2021

Materials

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The application of concrete containing mineral admixtures was attempted in Northwest China in this study, where the environment has the characteristics of low humidity and large temperature variation. The harsh environment was simulated by using an environmental chamber in the laboratory and four types of concrete were prepared, including ordinary concrete and three kinds of mineral admixture concretes with different contents of fly ash and blast-furnace slag. These concretes were cured in the environmental chamber according to the real curing conditions during construction. The compression strength, fracture properties, SEM images, air-void characteristics, and X-ray diffraction features were researched at the early ages of curing before 28 d. The results showed that the addition of fly ash and slag can improve the compression strength and fracture properties of concrete in the environment of low humidity and large temperature variation. The optimal mixing of mineral admixture was 10% fly ash and 20% slag by replacing the cement in concrete, which can improve the compression strength, initial fracture toughness, unstable fracture toughness, and fracture energy by 23.9%, 25.2%, 45.3%, and 22.6%, respectively, compared to ordinary concrete. Through the analysis of the microstructure of concrete, the addition of fly ash and slag can weaken the negative effects of the harsh environment of low humidity and large temperature variation on concrete microstructure and cement hydration.

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“…According to GOST 25818-91 and 25592-91, the content of calcium oxide CaO in the ash component of the ash and slag mixture and in the fine-grained mixture should be no more than 10 % by weight. The content of magnesium oxide MgO in the ash component of the ash and slag mixture and in the fine-grained mixture should be no more than 5 % by weight [11,12]. The content of sulfurous and sulfuric acid compounds in terms of SO3 in the ash and slag components of the ash-and-slag mixture should be no more than 3 % by mass, including sulfide sulfurno more than 1 % by mass.…”

Section: Methodsmentioning

confidence: 99%

Modern trends in the development of the construction industry in the production of building materials

Aldungarova

Aryngazin

Larichkin

et al. 2021

tbus

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The paper describes the technology of manufacturing a construction product by vibrocompression using ash and slag waste from thermal power plants in the Pavlodar region. The task of the experimental research was to obtain a hollow wall stone based on ash and slag waste with a strength grade that is not inferior to products made according to the traditional recipe. The obtained samples with different ratios of components in the mixture were investigated for compressive strength, moisture absorption, frost resistance. It has been established that when ash and slag waste are added to the composition of the concrete mixture in an amount of up to 35 % of the mass of dry components, the strength characteristics of the hollow wall stone correspond to the selected brand

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Effect of fly ash and slag on properties of normal and high strength concrete including fracture energy by wedge splitting test: Experimental and numerical investigations

Cited by 24 publications

References 14 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Early-Age Mechanical Characteristics and Microstructure of Concrete Containing Mineral Admixtures under the Environment of Low Humidity and Large Temperature Variation

Modern trends in the development of the construction industry in the production of building materials

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