Advance treatment by nanographite for Portland pulverised fly ash cement (the class F) systems

Kırgız, Mehmet Serkan

doi:10.1016/j.compositesb.2015.08.003

Cited by 54 publications

(14 citation statements)

References 46 publications

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“…Owing to the increasing concerns for environmental protection and climate change, many initiatives have been taken to reduce impacts associated with cement production and use. These include the incorporation of supplementary cementitious materials (SCMs) such as fly ash (FA), limestone powder (LP) and ground granulated blast furnace slag (GGBS) into cement mixes and the recycling of industrial solid wastes to reduce the reliance on PC in new and existing structures [5][6][7][8][9]. However, the proportions of these SCMs used as a replacement for PC are often restricted.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

Peng

Unluer

2022

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

Peng

Unluer

2022

Construction and Building Materials

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“…However, due to the large surface to volume ratios of nanomaterials, their uniform dispersion is a challenge [16,32,44]. The high surface area of nanomaterials and hydrophobic nature of the surface generates strong tendencies towards agglomeration through van der Waals forces, preventing their effective use as reinforcements [42,45,46]. Further, the largely inert surfaces of CBNs offer limited potential for chemical bonding to cement hydrates.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high-performance cementitious composites with enhanced mechanical and durability characteristics

Sadiq

Soroushian²,

Bakker³

et al. 2021

SN Appl. Sci.

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Concrete is the most widely used construction material. It offers a desirable balance of cost, strength, moisture barrier qualities, and dimensional and chemical stability. The rising costs of aging infrastructure systems, however, point to the need for further improvements in concrete properties. Carbon-based nanomaterials (CBNs) are predicted to have excellent mechanical properties, and so are attractive candidates for addressing these issues. However, the relatively high cost of CBNs, means that only low weight fractions in cement matrices will be economically viable, which presents a significant challenge. The research presented here investigated various surface functionalization techniques for improving the compatibility of carbon nanomaterials (multi-walled carbon nanotubes, carbon nanofiber and graphene nanoplatelets) with cementitious materials in fresh and hardened state. The effects of surface functionalization on the contributions of CBNs to the performance characteristics of ultra-high-performance cementitious matrices (UHPCM) were evaluated. Functionalized multi-walled carbon nanotubes at 0.03% weight fraction increased the flexural strength by 30%, doubled the energy absorption capacity, and tripled the ductility of UHPCM. The moisture barrier qualities, abrasion resistance and toughness characteristics of UHPCM benefited significantly from introduction of CBNs at less than 0.1% weight fraction. This study demonstrates that the low weight fraction of CBNs can effectively enhance the key engineering properties of UHPCM at a viable cost. Thus, this approach has both performance advantages and economic benefits. Article highlights Surface functionalization of multiwalled CNTs improved dispersion in cementitious matrices at low weight fractions. 0.03 wt.% multiwalled CNT addition increased the flexural strength and the flexural toughness of UHPCM. Abrasion resistance and moisture barrier qualities improved. These improvements are achieved at viable cost.

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“…The chemical properties of the cement and its time change provide insight into the strength of the cement system and the chemical properties of cement [2,3,4]. A variety of byproduct products used in many comprehensive research trials to alter the properties of cement-based concrete such as slag, calcinated clay, calcined clay, fuel ash, husk ash, soil granulated furnace slag, and metakaolin [8,[11][12][13][14][15]. Polycarboxylates were utilized to modify concrete by accelerator or to delay the setting time following the desired project to increase the viscosity and mechanical behavior in liquid and solid phases by reducing water mixing [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Soft Computing and Multi-Scal Model Technics to Predict the Early Age Compression Strength of Cement Paste as a Function of Polymer Contents, Water-to-Cement-Ratio, and Curing Ages

Mohammed

Ghafor

Mahmood

et al. 2021

Preprint

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In this study, the effect of two water reducer polymers with smooth and rough surfaces on the compression strength of Ordinary Portland cement (OPC) was investigated. Three different initial ratios between water and cement (w/c) 0.5, 0.6, and 1 were used in this study. The amount of polymer contents varied from 0 to 0.06 % (%wt) for the cement paste with initial w/c of 0.5 and the polymer contents ranged between 0 to 0.16% (%wt) for the cement paste with initial w/c of 0.6 and 1 were investigated. SEM test was conducted to identify the impact of polymers on the behavior of cement paste. The compression strength of OPC cement was increased significantly with increasing the polymer contents. Because of a fiber net (netting) around cement paste particle was developed when the polymers were added to the cement paste which leads to decrease the void between the particles, binding the cement particles, therefore, increased the viscosity and compression strength of the cement rapidly. In this analysis, the hardness of cement paste with polymer contents has been evaluated and modeled using four different model technics. More environmentally sustainable construction, and lower cost than conventional building materials and early age strengths of the cement. To overcome the mentioned matter, this study aims to establish systematic multiscale models to predict the compression strength of cement paste containing polymers and to be used by the construction industry with no theoretical restrictions. For that purpose, a wide data a total of 280 tested cement paste modified with polymers, has been conducted, analyzed, and modeled. Linear, Nonlinear regression, M5P-tree, and Artificial Neural Network (ANN) technical approaches were used for the qualifications. In the modeling process, the most relevant parameters affecting the strength of cement paste, i.e. polymer incorporation ratio (0-0.16% of cement's mass), water-to-cement ratio (0.5-1), and curing ages (1 to 28 days). According to the correlation coefficient (R), mean absolute error and the root means a square error, the compression strength of cement paste can be well predicted in terms of w/c, polymer content, and curing time using four various simulation techniques. Among the used approaches and based on the training data set, the model made based on the Non-linear regression, ANN, and M5P-tree models seem to be the most reliable models. The sensitivity investigation concludes that the polymer content is the most dominating parameter for the prediction of the compression strength of cement paste with this data set.

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Advance treatment by nanographite for Portland pulverised fly ash cement (the class F) systems

Cited by 54 publications

References 46 publications

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

Ultra-high-performance cementitious composites with enhanced mechanical and durability characteristics

Soft Computing and Multi-Scal Model Technics to Predict the Early Age Compression Strength of Cement Paste as a Function of Polymer Contents, Water-to-Cement-Ratio, and Curing Ages

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