Producing low-cost self-consolidation concrete using sustainable material

Zena K. Abbas; Ahlam A. Abbood; Raghad S. Mahmood

doi:https://doi.org/10.1515/eng-2022-0368

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Publication Date

Sat Jan 01 2022

Journal Name

Open Engineering

Volume

12

DOI

https://doi.org/10.1515/eng-2022-0368

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Producing low-cost self-consolidation concrete using sustainable material

self-consolidation concrete

clay brick powder

ceramictile

granite tile

marblewastepowder

thermostoneblock

Zena K. Abbas

Ahlam A. Abbood

Raghad S. Mahmood

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Abstract<p>The disposal of the waste material is the main goal of this investigation by transformation to high-fineness powder and producing self-consolidation concrete (SCC) with less cost and more eco-friendly by reducing the cement weight, taking into consideration the fresh and strength properties. The reference mix design was prepared by adopting the European guide. Five waste materials (clay brick, ceramic, granite tiles, marble tiles, and thermostone blocks) were converted to high-fine particle size distribution and then used as 5, 10, and 15% weight replacements of cement. The improvement in strength properties is more significant when using clay bricks compared to other activated waste ceramics and granite tiles. The percentage increases to 11.59% at 28 days for compressive strength when using 10% replacement of cement weight. The ability to produce eco-SCC with less cement content and lower cost consumption is encouraged, although the enhancement in strength is not high since the waste can be disposable. While the percentage reduction in the strength of SCC mixes containing marble tile or thermostone block powder increases with the replacement of cement weight with a greater need for superplasticizer justification, we recommend using 5% as a replacement by weight of cement with an insignificant retardation of strength. Finally, there is a good relationship between compressive strength and ultrasonic pulse velocity and between tensile and flexural strength with a high <italic>R</italic> <sup>2</sup>.</p>

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Publication Date

Wed Jun 30 2021

Journal Name

Journal Of Economics And Administrative Sciences

Comparison of Hurst exponent estimation methods

Fractional Brownian motion

Hurst exponent

Short memory

Long memory

Self-similarity

Discrete Wavelet

Long-range dependence

Short-range dependence

Amjad H.

Munaf Y.

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Through recent years many researchers have developed methods to estimate the self-similarity and long memory parameter that is best known as the Hurst parameter. In this paper, we set a comparison between nine different methods. Most of them use the deviations slope to find an estimate for the Hurst parameter like Rescaled range (R/S), Aggregate Variance (AV), and Absolute moments (AM), and some depend on filtration technique like Discrete Variations (DV), Variance versus level using wavelets (VVL) and Second-order discrete derivative using wavelets (SODDW) were the comparison set by a simulation study to find the most efficient method through MASE. The results of simulation experiments were shown that the performance of the meth

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