Journal ArticleDOI
Characterization and modeling the flow behavior and compression strength of the cement paste modified with silica nano-size at different temperature conditions
Ahmed Mohammed,Serwan Rafiq,Wael Mahmood,Riyadh Noaman,Kawan Ghafor,Warzer Qadir,Quraish Kadhum +6 more
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TLDR
In this paper, the effect of nano-silica (NS) as an additive to the Ordinary Portland Cement was evaluated and quantified using non-linear regression (NLR) based model.About:
This article is published in Construction and Building Materials.The article was published on 2020-10-10. It has received 46 citations till now. The article focuses on the topics: Portland cement & Compressive strength.read more
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Soft computing techniques: Systematic multiscale models to predict the compressive strength of HVFA concrete based on mix proportions and curing times
TL;DR: In this paper, the compressive strength of concrete mixtures with high volume fly ash (HVFA) has been evaluated and modeled for the LEED (Leadership for Energy and Environmental Design).
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ANN, M5P-tree and nonlinear regression approaches with statistical evaluations to predict the compressive strength of cement-based mortar modified with fly ash
Ahmed Mohammed,Serwan Rafiq,Parveen Sihag,Rawaz Kurda,Rawaz Kurda,Wael Mahmood,Kawan Ghafor,Warzer Sarwar +7 more
TL;DR: In this paper, the compressive strength of concrete bricks with fly ash incorporation ratio (C and F) and water-to-binder ratio (0.235-1.2), and curing ages (1-365 days) is predicted using a multiscale model.
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Systematic multiscale models to predict the compressive strength of self-compacting concretes modified with nanosilica at different curing ages
Rabar H. Faraj,Rabar H. Faraj,Azad A. Mohammed,Ahmed Mohammed,Khalid M. Omer,Hemn Unis Ahmed +5 more
TL;DR: In this article, three different models including the linear relationship model (LR), nonlinear model (NLR), and multi-logistic model (MLR) were proposed to predict the compressive strength of SCC mixtures made with or without nano-silica (NS).
Journal ArticleDOI
Optimizing the content of nano-SiO2, nano-TiO2 and nano-CaCO3 in Portland cement paste by response surface methodology
TL;DR: In this paper, the effects of nano-SiO2, nano-TiO2 and nano-CaCO3 on the early hydration and mechanical properties of Portland cement at small dosages, and optimizes the dosage of the three nano materials by response surface methodology.
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Systemic multi-scale approaches to predict the flowability at various temperature and mechanical properties of cement paste modified with nano-calcium carbonate
Ahmed Salih,Serwan Rafiq,Wael Mahmood,Hind AL-Darkazali,Riyadh Noaman,Kawan Ghafor,Warzer Qadir +6 more
TL;DR: In this article, the effect of nano-calcium carbonate (nano-CaCO3) as an additive to the cement paste was evaluated and quantified, and the nonlinear regressions (NLR) model and Artificial Neural Network (ANN) technical approaches were used for the qualifications of the flow of slurry and stress at the failure of the cement mixture modified with nano-caCO3.
References
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Estimating the efficiency of the sandy soils-cement based grout interactions from Particle size distribution (PSD)
Ahmed Mohammed,Wael Mahmood +1 more
TL;DR: The particle size distribution of the soil fines content and mean particle size (d50) are used in a number of soil property relationships and in the soil classification as mentioned in this paper, which is used to analyze and model partic...
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Performance and working mechanism of amphoteric polycarboxylate-based dispersant and sulfonated acetone formaldehyde polycondensate-based dispersant in oil well cement
TL;DR: A comparative study of amphoteric polycarboxylate-based (APC) and a conventional sulfonated acetone formaldehyde polycondensate based (SAF) dispersant was conducted to understand their effects on performance and their working mechanism, especially for the high environmental temperatures used in oil well cementing operations as mentioned in this paper.
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Crystallization and melting behavior of silica nanoparticles and poly(ethylene 2,6-naphthalate) hybrid nanocomposites
TL;DR: In this paper, an organic and inorganic hybrid nanocomposites based on poly(ethylene 2,6-naphthalate) and silica nanoparticles were prepared by a melt blending process.
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Chemical mapping of cement pastes by using confocal Raman spectroscopy
Fengjuan Liu,Zhihui Sun +1 more
TL;DR: In this article, chemical mapping on the hydration process of cement paste with water-to-cement (w/c) ratio of 0.60 was implemented by Raman spectroscopy (RS).
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Comparative Study of the Effect of Incorporating SiO2 Nano-Particles on Properties of Poly methyl Methacrylate Denture Bases
TL;DR: In this paper, the impact of incorporation of nanosilica sand (crystalline) and nano-silica (amorphous) on the properties (impact strength, transverse strength, and hardness) of heat-cure type acrylic resin denture base material, polymethylmethacrylate (PMMA).