simultaneous substitution
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Author(s):  
Mohammad Kazem Sharbatdar ◽  
Mohammad Abbasi ◽  
Pouyan Fakharian

The viscosity is the main property of self- compacted concrete (SCC) and using of pozzolan material such as metakaolin (MK) and Silica fume (SF) can help to achieve that goal. The effect of simultaneous substitution of MK and SF instead of cement on the rheological and mechanical properties of self-compacted concrete was experimentally investigated in this paper. Seventeen mix designs were cast with a substitution weight percentage (5, 10, 15, 20 %) in water to adhesive material ratio equal 0.32. All mixes were examined by compressive, tensile strengths and water absorption tests with an appropriate fluidity, without having signs of segregation or instability. The test results were indicated that the SCC mixes containing MK and SF had higher compressive and tensile strengths in comparison with no-pozzolan concrete. The comparison of linear multiple regression techniques (LMRT) and nonlinear multiple regression technique outputs with experimental results showed an appropriate similarity.


2019 ◽  
Vol 143 ◽  
pp. 274-281
Author(s):  
Sajjad Ahmad ◽  
Muhammad Suleman ◽  
Sara Musaddiq ◽  
Najeeb Fuad Al-Khalli ◽  
Philips Olaleye Agboola ◽  
...  

2018 ◽  
Vol 9 (11) ◽  
pp. 2753-2766
Author(s):  
Aleksandar Todorovic ◽  
Cody J. Lensing ◽  
Jerry Ryan Holder ◽  
Joseph W. Scott ◽  
Nicholas B. Sorensen ◽  
...  

2018 ◽  
Vol 14 (2) ◽  
pp. 1154-1168 ◽  
Author(s):  
Robert Balawender ◽  
Michał Lesiuk ◽  
Frank De Proft ◽  
Paul Geerlings

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 20032-20038 ◽  
Author(s):  
Hancheul Kim ◽  
Yoorim Jang ◽  
Sitae Noh ◽  
Jongoh Jeong ◽  
Donghyun Kim ◽  
...  

Carboxylated GAP copolymers (polyGA-carboxylate) compounds (1–7), were synthesized by the simultaneous substitution reaction with PECH, sodium azide, and sodium carboxylate in DMSO.


2017 ◽  
Vol 41 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Tamanna Mariam ◽  
Shamima Choudhury

Synthesis and characterization of BiFeO3 samples, co-doped with rare earth Nd and Co in place of Bi and Fe respectively were investigated at room temperature (RT). The formula of the four samples are Co-doped BiFe1–xCoxO3 (x = 0.05-0.10) and Nd and Co co-substituted Bi0.95Nd0.05Fe0.95Co0.05O3 and Bi0.90Nd0.10Fe0.90Co0.10O3. These ceramic samples were synthesized by conventional solid state reaction method. The X-ray diffraction patterns clearly reveal that the secondary impurity phases were eliminated significantly due to the simultaneous substitution of Nd and Co in place of Bi and Fe respectively of BiFeO3 ceramics. The surface morphology of the synthesized samples was found to improve due to the simultaneous substitution of Nd and Co in place of Bi and Fe in BiFeO3. The average grain size of the first sample with 5% doping of Co in place of Fe was 1.5?m. In the second sample with 10% Co doping in place of Fe, the average grain size became 1.25 ?m. In presence of 5% Nd in place of Bi as well as with 5% doping of Co in place of Fe , grain size reduced to 0.75?m. The sample with 10% doping of Nd and Co in place of Bi and Fe respectively, average grain size decreased to 0.5?m. The EDX spectroscpoy ensured the presence of Bi, Nd, Fe, Co and O in these samples and their percentage of mass and atoms. Magnetic properties of the samples were also investigated at room temperature by measuring magnetization versus magnetic field (M-H) hysteresis loops. The wider loop clearly demonstrates the significant improvement of the magnetic behavior in 10% Nd and Co doped Bi0.90Nd0.10Fe0.90Co0.10O3 sample. The enhanced magnetic properties might be attributed to the substitution induced suppression of spiral spin structure of BiFeO3. The outcome of this investigation suggests the potentiality of the simultaneous doping of Nd and Co in BiFeO3 ceramics to improve their structural, morphological and magnetic characteristics.Journal of Bangladesh Academy of Sciences, Vol. 41, No. 1, 85-93, 2017


2017 ◽  
Vol 218 (7) ◽  
pp. 1600410
Author(s):  
Shang-Cyuan Huang ◽  
Chien-Hsin Yang ◽  
Yao-Yuan Chuang ◽  
Tzong-Liu Wang

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