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Online since: October 2010
Authors: Ming Ma, Ming Xiu Chen, Ya Ping Peng
Keywords: Reinforcement, reinforced concrete frame, FRP, seismic performance Introduction According to many studies in recent years, the effectiveness of the technique attaching FRP sheets on the surface of reinforced concrete structure as reinforcement have been proved (Ye and Feng 2006, Zou et al. 2007, Balsamo et al. 2005), which has been widely used in the engineering practices.
The author of this Paper proposed the beam-column FRP reinforcement scheme and concrete design methods for the beam-column combination, and such methods have been proved effective based on experiments and research, with the details shown in references (Peng et al. 2006).
In concrete structural seismic reinforcement, many scholars believe that based on the same stiffness, the use of GFRP shall have better overall efficiency than CFRP (Amoury and Ghobarah 2002, Ou et al. 2003), but CFRP features high-strength performance, superior Figure 2: Performance points of frame displacement in analysis with capacity spectrum method GRKJ-1 HRKJ-1 HRKJ-2 KJ-1 durability and corrosion resistance, which has enabled the current domestic reinforcement engineering applications to prefer CFRP, and in fact, the two kinds of fibers mixed in accordance with the appropriate ratio will better its effect (Li et al. 2002, Costas et al. 2003).
The references (Balsamo et al. 2005) conducted the pseudo-dynamic seismic test of the full-scale CFRP reinforcement concrete framework, with the vertical members of the test framework of two shear walls and two pillars.
References [1] Amoury, T El, and Ghobarah, A (2002).
Online since: August 2013
Authors: Yu Yan Wu, Chao Yang Fang
References [1] Feng Gan, Liansheng Lin, et al: Jiangxi Science, Vol.29(2011), p.131-137.
(In Chinese) [2] Hui Li, Changan Li, et al: Quaternary Sciences, Vol.28(2008), p.332-337.
[5] Guofeng Wu, Lijuan Cui, et al: Journal of Lake Sciences, Vol.21(2009), p.288-297.
(In Chinese) [9] Yaohuan Huang, Hao Wang, et al: Progress in Geography, Vol.29(2010), p.549-556.
(In Chinese) [12] Wei Li, Shenghui Fang, el at: Remote Sensing Technology and Application, Vol.30(2005), p.435-438.
Online since: May 2014
Authors: Yi Xia Zhang, Paul Jonathan Hazell, Xiao Shan Lin
El-Dakhakhni, et al., "Validity of SDOF models for analyzing two-way reinforced concrete panels under blast loading," Journal of Performance of Constructed Facilities (J.
Zhou, et al., "Numerical prediction of concrete slab response to blast loading," International Journal of Impact Engineering, vol. 35, pp. 1186-1200, 2008
Luccioni, et al., "Analysis of building collapse under blast loads," Engineering Structures, vol. 26, pp. 63-71, 1// 2004
Malvar, et al., "A plasticity concrete material model for DYNA3D," International Journal of Impact Engineering, vol. 19, pp. 847-873, 10// 1997
Malvar, et al., "Numerical modeling of concrete confined by fiber-reinforced composites," Journal of Composites for Construction, vol. 8, pp. 315-322, 2004
Online since: November 2011
Authors: Singh Siddhartha, Suveda Aarya, A.K. Srivastava, Monika Mishra, M.A. Wahab
Steckenreiter et al. [7], Neagu et al. [8], Vaibhav et al.[9], Ravinder et al.[10], Changlong liu et al.[11], Nandlal Singh et al. [12], Zhiyong Zhu et al. [13], Youmei Sun et al. [14-19] have studied the effect of different energy ion beam irradiations on the physical, electrical and chemical properties of Ketpton, PET,PES.
Edn 1984, 22, 529 [28] El- Naggar, A M., Kim, H.C., Lopez, L.D. and wilkes.
Online since: February 2006
Authors: Koen Van Den Abeele, W. Desadeleer, Geert de Schutter, Martine Wevers
Active ultrasonic measurements on the other hand provide the linear elastic material properties of the product during the hydration process (Sayers and Dahlin, 1993; Boumiz, 1995; Boumiz et al., 1996; Lacouture et al., 2003).
In combination with volumetric shrinkage measurements, the knowledge of the elasticity properties has been used to describe the evolution of the capillary network of concrete during hardening (Morin et al., 1998).
Micromechanical features at the constitutive level (microscopic nonlinear stress-strain relations) result in ultrasonic wave distortion, which gives rise to changes in the resonance frequencies as a function of drive amplitude, generation of accompanying harmonics, nonlinear attenuation, and multiplication of waves of different frequencies (Buck et al., 1978; Adler and Nagy, 1991; Nazarov and Sutin, 1997; Guyer and Johnson, 1999; Van Den Abeele et al., 2000).
We quantify the nonlinearity parameter β by calculating the proportionality coefficient from the quadratic dependence relation A2=β(A1)2, with A2 the level of the second harmonic, and A1 the fundamental amplitude (Buck et al. 1978; Nazarov and Sutin, 1997; Lacouture et al. 2003).
El. (1998), Etude de la microfissuration des Bétons par émission acoustique, rapport de maîtrise de physique, Lab.
Online since: January 2022
Authors: Leonid I. Dvorkin, Vadim Zhitkovsky, Nataliya Lushnikova, Mohammed Sonebi
Its efficiency as a cementitious component of concrete and mortars is compatible to silica fume (Dvorkin et al, 2012; Khatib, 2018).
The effect of combination of zeolite and superplasticizers on rheological properties of cement grouts was studied (Sahmaran et al, 2008).
Studies of pozzolanic properties of natural zeolites prove that they are capable to substitution reactions with calcium hydroxide (Raggiotti et al., 2018).
M., Baalbaki, O., and El Kordi, A.
,Özkan, N, Keskin, S.B., Uzal, B. et al. 2008.
Online since: May 2023
Authors: Haryo Satriya Oktaviano, Arenst Andreas Arie, Agung Nugroho, Rafli Eghbal Haraki, Ratna Frida Susanti
Previous studies by Li et al. obtained superior cyclic stability (99% in 1000 cycles) with the ratio of AC/ZnO = 1:2 [6].
The similar result has also been observed in the previous research done by Aljeboree et al [17].
Chaudhary et al., “Removal of Oil and Grease in Wastewater using Palm Kernel Shell Activated Carbon,” IOP Conf.
El-Hendawy, “An insight into the KOH activation mechanism through the production of microporous activated carbon for the removal of Pb2+ cations,” Appl.
Wang et al., “Recent progress in carbon-based materials for supercapacitor electrodes: a review,” J.
Online since: April 2013
Authors: Teresa Rivas, Cristina Montojo, Ana Jesús López-Díaz, María Eugenia López de Silanes, Santiago Pozo, Maria Paula Fiorucci
The references about the efficiency of chemical, physical and laser based cleaning techniques are numerous in the case of sedimentary and metamorphic (marbles) rocks but they are scarce in the case of granites: in Santamaría et al. (1996) several chemical and physical cleaning methods have been applied to granites, finding no harmful effects as fracturing or mineral transformation [6].
In El-Gohary (2009), several chemical (EDTA poultices) and physical (dry cleaning and ultrasonic cleaning) methods have been applied to remove weathering red crusts on granites, also finding a high level of efficiency [7].
In Pan et al. (2009), an excimer laser was successfully applied in order to remove beeswax from granite [10].
Besides these crust remains, a powdered debris rich in Si, Al, K and Na, which goes unnoticed under optic microscopy, is detected.
El-Gohary: Experimental tests used for treatment of red weathering crusts in disintegrated granite – Egypt, Journal of Cultural Heritage 10 (2009) pp. 471-479
Online since: January 2021
Authors: Souhir Elhassasna, Harkati Brahim, Hadjar Samah
Al-Omary, Y.S.
El-Emam, I.A.
Al-Suwaidan, A.A.
Al-Saadi, C.V.
El Midaoui, B.
Online since: October 2015
Authors: A.G. Vijaya Kumar, C. Veeresh, B. Rushi Kumar, S. Vijaya Kumar Varma
The results of the present study are compared with the results obtained by Chaudhary et al. [1], and Dulal et al. [4] in the absence of angle of inclination, our results appear to be in good agreement with the existing results. 1.
Hossain et al. [8] have studied the effects of convection flow for an isothermal inclined plate.
Orthan Aydm et al [15] studied MHD mixed convective heat transfer flow about an inclined plate.
A similar is studied by Raju et al. [20].
A., El-Anssary.
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