Linking stability characteristics to material performance of self-consolidating concrete-equivalent-mortar incorporating fly ash and metakaolin

Mehdipour, Iman; Vahdani, Mohammad; Amini, Kamran; Shekarchi, Mohammad

doi:10.1016/j.conbuildmat.2015.12.090

Cited by 21 publications

(9 citation statements)

References 18 publications

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“…In addition, MK incorporation reduces segregation in mortar. In a recent study, 15% MK enabled to raise the w/c ratio from 0.35 to 0.41 at a segregation index of 20% [64].…”

Section: Effects On Flowabilitymentioning

confidence: 94%

“…As smaller particles experience more Brownian motion, they result in a better flow due to enhanced dispersion of mortar particles. Despite all the above-mentioned positive effects, high cement replacement by FA (more than 30%) at a relatively high w/b ratio may cause segregation and bleeding problems in mortar mixtures [64].…”

Section: Effects Of Scms On the Properties Of Structural Mortarmentioning

confidence: 99%

“…The mean diameter (D 50 ) of MK particles is approximately three times smaller than that of cement. The higher specific surface area or surface fineness and smaller particle size of MK have an adverse effect on the flowability of mortar mixture [64]. The calcination method has a second-order influence on the shape of particles; the smaller particles can have smoother surface through the flash calcination process [65].…”

Section: Effects On Flowabilitymentioning

confidence: 99%

“…The calcination method has a second-order influence on the shape of particles; the smaller particles can have smoother surface through the flash calcination process [65]. In mortar, 42% reduction in fluidity was observed with 25% MK [64]. In addition, MK incorporation reduces segregation in mortar.…”

Section: Effects On Flowabilitymentioning

confidence: 99%

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Utilization of By-Products and Wastes as Supplementary Cementitious Materials in Structural Mortar for Sustainable Construction

et al. 2020

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Rapid growth in industrial development has raised the concern of proper disposal of the by-products generated in industries. Many of them may cause serious pollution to the air, land, and water if dumped in open landfills. Agricultural and municipal wastes also cause environmental issues if not managed properly. Besides, minimizing the carbon footprint has become a priority in every industry to slow down global warming and climate change effects. The use of supplementary cementitious materials (SCMs) obtained from agricultural, industrial, municipal, and natural sources can decrease a significant amount of fossil fuel burning by reducing cement production and contribute to proper waste management. Also, SCMs can enhance desirable material properties like flowability, strength, and durability. Such materials may play a big role to meet the need of modern time for resilient construction. The effective application of SCMs in cement-based materials requires a clear understanding of their physical and chemical characteristics. Researchers studied how the flowability, strength, and durability properties of structural mortar change with the replacement of cement with different SCMs. Various experiments were conducted to examine the behavior of structural mortar in extreme conditions (e.g., high temperature). Many scholars have attempted to improve its performance with various treatment techniques. This article is an attempt to bring all the major findings of the recent relevant studies together, identify research gaps in the current state of knowledge on the utilization of SCMs in structural mortar, and give several recommendations for further study. The available results from recent studies have been reviewed, analyzed, and summarized in this article. A collection of the updated experimental findings will encourage and ease the use of various by-products and wastes as SCMs in structural mortar for sustainable construction.

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“…In addition, MK incorporation reduces segregation in mortar. In a recent study, 15% MK enabled to raise the w/c ratio from 0.35 to 0.41 at a segregation index of 20% [64].…”

Section: Effects On Flowabilitymentioning

confidence: 94%

Section: Effects Of Scms On the Properties Of Structural Mortarmentioning

confidence: 99%

Section: Effects On Flowabilitymentioning

confidence: 99%

Section: Effects On Flowabilitymentioning

confidence: 99%

See 2 more Smart Citations

Utilization of By-Products and Wastes as Supplementary Cementitious Materials in Structural Mortar for Sustainable Construction

et al. 2020

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“…RSM) might well be attractive in this scenario. It is worthy to note that DOE is commonly applied to design of concrete mixture [78][79][80].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Mechanical Properties of Frozen Soils Using Response Surface Method: An Optimization Approach

Vahdani

Ghazavi

Roustaei

2020

IJE

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The present study was based on a promoting statistical method known as response surface method (RSM). RSM has been applied as an efficient method to optimize many physical applications in industry for more than two decades. In the current study, the RSM was utilized as a platform to develop models as a function of some prescribed input factors to predict mechanical properties (responses) of frozen soils (i.e. peak tensile/compressive strength, elasticity modulus). Besides, RSM makes it possible to find significant factors and probable interactions as well. A widespread literature review was conducted and three case studies were chosen to evaluate the performance of the RSM in developing precise models and finally an optimum experiment. For each case study, less than half of the available data (an average of 40.8%) was employed to develop models and the remaining part was employed to evaluate the validity of derived models. A comparison between predicted and measured data showed a good agreement with a significant level of 0.05. This indicates that upon using the model a hundred times to predict an specific property for different input factors, the maximum five predictions may diverge from the measured values with ± confidence interval. In addition, some contours were plotted to give a comprehensive presentation of any probable correlations between investigated properties and input factors. Based on the developed models with an average correlation coefficients (R 2) of 93.69, temperature was found to be the most significant factor affecting the mechanical properties of frozen fine soil, while the dry density was not as effective as the temperature.

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Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Amara

Arabi

Perrot

2021

Environ Sci Pollut Res

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The self-compacting concrete (SCC) mix design is much more complex than that of ordinary concrete. Increased testing on fresh concrete and a substantial volume of materials is consequently needed. The concrete equivalent mortar (CEM) method proposes an approach that simplifies and speeds up the experimental testing programmes. This paper seeks to establish the relationships between the rheological properties of SCC and the corresponding CEM mixes. Another aim is to validate the unconventional tools used to test the flow properties of CEM relative to the procedures applied for SCC. Different series of SCC and CEM mixes, based on natural and recycled aggregates, with various superplasticizer contents were tested. The flow behaviour of SCC was tested in line with procedures recommended by EFNARC; that of self-compacting concrete equivalent mortar (SC-CEM) was carried out with unconventional tools (mini-slump cone, slump flow time T 250 , mini L-Box, 2.5-mm sieve, and mini LCPC Box), described in detail in this paper. A rheometer equipped with vane geometry was also used to show the close relationship between SCC and the SC-CEM yield stress. The experimental results indicate that the fresh properties of the mixture series are congruent with the acceptance criteria of SCC, but they are affected when increasing the superplasticizer dosage and further impacted when recycled coarse aggregates (RCAs) replace natural coarse aggregates (NCAs). The slump flow test appears to be a good practical means for predicting the yield stress of SC-CEM. The cross-referencing results reveal significant relationships between SCC and the corresponding SC-CEM, particularly for filling ability and passing properties. Reasonable correlation coefficients from 0.70 to 0.85 were found.Keywords Recycled concrete aggregates • Concrete equivalent mortar • Self-compacting concrete • Fresh properties

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Linking stability characteristics to material performance of self-consolidating concrete-equivalent-mortar incorporating fly ash and metakaolin

Cited by 21 publications

References 18 publications

Utilization of By-Products and Wastes as Supplementary Cementitious Materials in Structural Mortar for Sustainable Construction

Utilization of By-Products and Wastes as Supplementary Cementitious Materials in Structural Mortar for Sustainable Construction

Prediction of Mechanical Properties of Frozen Soils Using Response Surface Method: An Optimization Approach

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

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