Factorial Design for Studying the Properties of Recycled Aggregate Concrete Exposed to Aggressive Media

Abed, Ammar Ali; Kamal, Ibtisam

doi:10.36909/jer.v9iicrie.11635

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…silica fume and 0.42 w/c. The RSM approach was applied successfully for the optimization and modeling of the mix design and properties of modified concrete and mortars [22,23] . On the other hand, the morphology of typical control concrete and SF-concrete specimens was tested by Scanning Electron Microscopy (SEM).…”

Section: Resultsmentioning

confidence: 99%

Enhancing Concrete Properties Using Silica Fume: Optimized Mix Design

Ali Abed,

Kamal,

Mojtahedi

2023

j. of smar. build. and constr. technol.

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In the current work, concrete mixes containing (7.0-33.11) weight % silica fume as a partial replacement of cement with a water /cement ratio (0.42-0.48) were prepared according to an adopted two factorial central composite design. The samples were tested, optimized, and modeled for compressive strength and density. The estimated results confirmed that compressive strength and density increase with increasing silica fume content up to 11.9 wt.%. Response surface analysis results confirmed that silica fume concrete with developed compressive strength (53.42 MPa) could be prepared by incorporation of 11.9 wt. % silica fume as partial replacement of cement using 0.42 water/cement ratio. An increase in compressive strength and density (up to 39.3% and 2.6% ) respectively was recorded for silica fume concrete mixes compared to Portland cement concrete. Overall, the research findings revealed that silica fume concretes prepared with appropriate silica fume content and water/cement ratio exhibited superior strength and density characteristics candidate them to be used effectively in civil engineering applications.

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Section: Resultsmentioning

confidence: 99%

Enhancing Concrete Properties Using Silica Fume: Optimized Mix Design

Ali Abed,

Kamal,

Mojtahedi

2023

j. of smar. build. and constr. technol.

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“…The results obtained affirm that the espoused model can be utilized to detect the optimum compressive strength and that it is appropriate for usage. The methodology was applied successfully to optimize and model the properties of concrete composites including compressive strength [36][37][38][39].…”

Section: Anova Resultsmentioning

confidence: 99%

Factorial Mixture Design for Properties Optimization and Modeling of Concrete Composites Incorporated with Acetates as Admixtures

2023

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Nowadays, admixtures are used with the aim to provide strength and durability to concrete with less water use. New and low-cost admixtures gained a large amount of consideration to mitigate the problems associated with concrete’s durability and service life without upsetting its strength properties. The current work investigates the effect of three types of acetates on the workability, density, and compressive strength of concrete, which is used in structures of the Iraqi ports that suffer from corrosion damages and deterioration owing to the aggressive marine environments. Potassium acetate (KA), calcium acetate (CaA), and ethyl acetate (EA) are incorporated with different doses (1.38–5.6 wt.% of cement) in concrete mixtures using different water/cement ratios (0.48–0.54) based on an espoused central composite experimental design. The experimental results confirmed that the average workability increased with increasing the acetate dose, particularly with CaA. The density and compressive strength of 28 days of water-cured mixtures increased with increasing acetate dose following the order: Ca > K > Ethyl acetate and decreased with increasing w/c ratio. The high rise in compressive strength and workability linked to control mixtures was 30.8% and 77.3% as well as 15.7% and 64.3% for the mixtures incorporated with 5.6 wt.% CaA and KA, respectively. While it was 14.2% and 58.3% for the mixtures incorporated with 3.5 wt.% EA. RSM was employed to optimize and model the design and hardened properties of concrete mixtures. ANOVA results predicted the same trend, which was obtained from the experimental results. The mathematical models were valued with high-regression coefficients. The highest compressive strength of 42.68 MPa has been achieved for a concrete mixture of 0.48 w/c ratio by the incorporation of 5.1 wt.% CaA through a model with R2 96.97%. The relatively low-cost acetate admixtures, particularly CaA, seemed promising for the fabrication of concrete with outstanding properties.

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“…Pareto chart is used to recognize the effect level of the independent parameters on each considered response, the perpendicular line (significant front) displays the effects that are statistically significant at 95% confidence level. Dependent parameter (responses) is optimized by the use of major trends as well as the empirical regression sample [28,29].…”

Section: Experimental Designthe Timementioning

confidence: 99%

Environmentally Friendly Additives for Aqueous Drilling Fluid Systems: Optimum Flow Characteristics and Models

Kamal,

Abdullah,

Al-Badran

et al. 2023

E3S Web of Conf.

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Recently, renewable additives are incorporated to design novel drilling fluid formulations with properties meeting the needs of downhole atmospheres and environmental regulations. The work deals with the investigation, optimization, and modeling of the rheological properties of new aqueous drilling fluid systems incorporated with green sliver nanoparticles and mastic gum and the estimation and optimization of the flow mathematical models. The average range of the experimental values for apparent viscosity, plastic viscosity, yield point, and low-shear-rate yield point for the prepared drilling fluids are 22-38 cP, 8-24 cP, 26-32 lb/100ft2, 18-35 lb/100ft2 respectively, while the optimum values estimated by ANOVA are 38.79 cP, 25.12 cP, 33.47 lb/100ft2, and 42.16 lb/100ft2 respectively. The optimum rheological properties are achieved by incorporating 17.07 ml of mastic gum and 1.6 ml of silver NPs colloids. The outcomes showed that the green additives looked talented to be applied for governing drilling fluid characteristics within the oil industry-recommended standards. The results of modeling the flow of the optimized drilling fluid indicated that it is Pseudo plastic fluid that exhibited non-Newtonian behavior and shear thinning. The Bingham-plastic flow model was explored to be the topmost model that can describe the flow behavior of the optimized drilling fluid system.

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Factorial Design for Studying the Properties of Recycled Aggregate Concrete Exposed to Aggressive Media

Cited by 3 publications

References 20 publications

Enhancing Concrete Properties Using Silica Fume: Optimized Mix Design

Enhancing Concrete Properties Using Silica Fume: Optimized Mix Design

Factorial Mixture Design for Properties Optimization and Modeling of Concrete Composites Incorporated with Acetates as Admixtures

Environmentally Friendly Additives for Aqueous Drilling Fluid Systems: Optimum Flow Characteristics and Models

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