Testing and modeling the young age compressive strength for high workability concrete modified with PCE polymers
Lajan Burhan Abdalla,Kawan Ghafor,Ahmed Mohammed +2 more
- Vol. 1, pp 100004
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TLDR
In this paper, the impact of three types of polycarboxylate polymer (PCE) on the setting time of cement, workability, density and compressive strength (CS) of concrete until 28 days of curing was studied.Abstract:
This study was focused on the impact of three types of polycarboxylate polymer (PCE) on the setting time of cement, workability, density and compressive strength (CS) of concrete until 28 days of curing. The percentage of the polymer was ranged between 0 to 0.25% (by dry weight of cement). Slump test and CS results of concrete modified with polymers were compared with the plastic and hardened properties of concrete modified with silica fume used in the literature. Based on the statistical analysis, the range of silica fume used in different research studies varied between 0 to 25%. The w/c initially was 0.60 and decreased gradually to 0.46 with increasing the polymer contents. The CS of concrete modified with only 0.25% of polymers increased by 24% to 97% based on the types of polymer, polymer content, w/c, and curing time. Non-linear model (NLM) was used to model the compressive strength of concrete modified with three types of the polymer and silica fume, the CS of modified concrete was modeled as a function of polymer content, w/c, and period of curing. Depending on the NLM parameters, it was found that the polymers are more effective than silica fume on improving the workability and CS of concrete.read more
Citations
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TGA, rheological properties with maximum shear stress and compressive strength of cement-based grout modified with polycarboxylate polymers
TL;DR: In this article, the impact of two types of polycarboxylate (PCE) polymer on the rheological properties with the ultimate shear strength and compressive strength of cement-based grout with water-cement ratios (w/c) of 0.6 and 1.0 at two different temperatures 25°C and 50°C were studied.
Journal ArticleDOI
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).
Journal ArticleDOI
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.
Journal ArticleDOI
Viscosity, yield stress and compressive strength of cement-based grout modified with polymers
TL;DR: In this paper, two types of polycarboxylate (PCE) polymer (DBC-21 and VK-98) were used as additives in the cement-based grout.
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
TL;DR: 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.
References
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Journal ArticleDOI
Compressive strength, chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete
TL;DR: In this paper, the authors compared the mechanical and durability properties of high performance metakaolin and silica fume concretes to their microstructure characteristics, and found that the effect of metakaolins on the interfacial porosity is discussed based on test results.
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Effect of silica fume on mechanical properties of high-strength concrete
TL;DR: In this paper, the effects of binder systems containing different levels of silica fume on fresh and mechanical properties of concrete were investigated, and the results indicated that as the proportion of fume increased, the workability of concrete decreased but its short-term mechanical properties such as 28-day compressive strength and secant modulus improved.
Book
Concrete admixtures handbook : properties, science, and technology
TL;DR: In this article, the authors present a comprehensive overview of the use of admixtures in concrete technology and present a full update of the preceding ten chapters to reflect the relative advances made in the science and technology of different groups of different admixtures.
Journal ArticleDOI
High strength concrete containing natural pozzolan and silica fume
TL;DR: In this paper, various combinations of a local natural pozzolan and silica fume were used to produce workable high to very high strength mortars and concretes with a compressive strength in the range of 69-110 MPa.
Journal ArticleDOI
Effect of Fly Ash and Silica Fume on Compressive and Fracture Behaviors of Concrete
TL;DR: In this paper, the effects of replacing cement by fly ash and silica fume on strength, compressive stress-strain relationship, and fracture behavior of concrete were investigated, and it was found that fly ash substantially improved the post-peak compressive behavior, with a relatively smaller gradient in the descending part of the stressstrain curve.