List of Articles abbas akbarpour nik ghalb rashti

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  1 - Isophorone Diisocyanate (IPDI) Microencapsulation for Self-Healing of Cementitious Materials
  Komeil Farshidi Abbas Akbarpour Asghar Habibnejad Korayem Morteza Ebrahimi
  10.30495/ijase.2023.1992924.1076
  Since cementitious materials are brittle, they are prone to cracking. Cracks could be healed via autogenous methods namely healing microcapsules.The objective of this study was twofold. First, microencapsulation of isophorone diisocyanate (IPDI) as a catalyst-free heali More

  Since cementitious materials are brittle, they are prone to cracking. Cracks could be healed via autogenous methods namely healing microcapsules.The objective of this study was twofold. First, microencapsulation of isophorone diisocyanate (IPDI) as a catalyst-free healing agent. Second, evaluation of microcapsules effect on promotion of cementitious materials healing capability. PU prepolymer was synthesized and smoth spherical microcapsules of IPDI with average diameter of 48-62 μm were produced successfully. The microcapsules shell wall thickness varied linearly with microcapsule diameter and so, the shell wall thickness to diameter ratio was constant (~0.04).The microcapsules weight loss in a 6 months period was ~12.47% under ambient conditions. The mortars containg 3% of their cement weight IPDI microcapsules, had up to 74% recovery rate of compressive strength while this rate for control mortars (with no microcapsule) were less than 50%.EDS analysis of healed mortars, showed noticable amount of carbon in the areas of ruptured microcapsules and healed cracks, confirming that healing process had been precisely accomplished according to the theory of self healing assumed.Samples containig micocapsules had higher initial compressive strength in comparison with control ones, indicating that there had been an undesired rupture of portion of microcapsules during prepartion and molding of specimens. This demonstrated need of more studies and work on mechanical properties of microcapsules specially stiffness of those used in cementitious composites. Manuscript profile
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  2 - Study of Scale Effect on Seismic Performance of Steel Plate Shear Wall under Cyclic Loading
  abbas akbarpour mohammad memar eftekhari Mehrzad Tahamoli Roudsari
  10.30495/ijase.2023.708020
  Through recent years, several types of research have been performed about steel plate shear walls numerically, experimentally and a combination of these two methods. Scaled samples have been implemented to make transportation and movement processes easier. However, the More

  Through recent years, several types of research have been performed about steel plate shear walls numerically, experimentally and a combination of these two methods. Scaled samples have been implemented to make transportation and movement processes easier. However, the accuracy of samples with real scale is of concern. In this research -which has been performed experimentally and by software implementation-, at first, cyclic loading was applied on a single-story, single-span steel shear wall sample made with a one-third scale in the laboratory and then it was modeled in ANSYS and loaded in the same condition. The comparison between these two methods represents an acceptable conformation. After the verification accomplished, various conditions were modeled and analyzed in the software as one-fifth, one-fourth, one-third, one-second, two-third and one scale. The results indicate that averagely, a 25% decrement of maximum shear is observed in the scaled models but the result from contours shows a good conformation in the scaled results and indicates their reliability. Manuscript profile
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  3 - Experimental study of fiber concrete slab behavior against high electric heat
  Hossein Nematian Jelodar Ata Hojatkashani Rahmat Madandoust Abbas Akbarpour Seyed Azim Hosseini
  10.30495/ijase.2023.1994719.1077
  Concrete structures may be exposed to high heat. In such a way that high heat in the vicinity of concrete structures causes damage in concrete. The aim of this study is assessment of effect of electric high heat on the bending capacity, energy absorption, fracture type More

  Concrete structures may be exposed to high heat. In such a way that high heat in the vicinity of concrete structures causes damage in concrete. The aim of this study is assessment of effect of electric high heat on the bending capacity, energy absorption, fracture type and crack distribution of circular fiber concrete slab under monotonic loading. The concrete aggregates with a fracture percentage of 45% are from the mines around Tehran and the fibers used in the concrete are of macrosynthetic type. The concrete mixing design was based on the target compressive strength of 45 MPa and the amount of fibers equal to 0.5% of concrete volume. The heating of the concrete samples was done by a 2400-liter device with a power of 90 KW and maximum temperature of 550 degrees Celsius. To perform slab tests, Dartec9600 device was used with monotonic loading at a rate 0.004 mm/s. based on the Experimental studies conducted on the fiber concrete slab, the application of high heat did not cause concrete peeling but it reduced the capacity of the slab by 89.3% and decreased the energy absorption of the slab compared to the control sample. Also, SEM photos have shown the aggressive destruction of macrosynthetic fibers and the creation of cracks under the effect of high heat in fiber concrete. Manuscript profile