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Analysis of Fibrous Reinforced Concrete Beams
تحلیل العتبات الخرسانیة المسلحة والمعززة بالالیاف الفولاذیة

Authors: Ayad Zeki Saber Agha --- Mereen Hassan Fahmi Rasheed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2012 Volume: 30 Issue: 6 Pages: 974-990
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Steel fiber reinforced concrete is used as a construction material in modern structures. Recent studies have shown that steel fiber can be used to improve the behavior of structures and increase the bending moment capacity and shear strength of reinforced concrete members.This research present and modify the nominal and ultimate bending momentequation, maximum and balance reinforcement indices and depth of compression zone for different types of reinforced concrete beams: single, double and T beams including the effect of steel fibers.The modified equations showed that the internal moment capacity of the beams with steel fiber increased by the amount ( ) which represent the participation of the steel fiber. The balance and maximum reinforced indexes ( & )decreased by ( ) for single, double & T-beam reinforced concrete, this means that the ductility increased by adding steel fiber. Also the depth of compression zone increased by afactor ( ) which is greater than (1.0). The modified equations are verified and applied on the reinforced concrete beams with steel fibers which tested in previous study, the theoretical results showed excellent agreement with the experimental values.


Article
EFFECTE OF FLY ASH AS A SUSTAINABLE MATERIAL ON LIGHTWEIGHT FOAMED CONCRETE MIXES

Authors: Ayad Zeki Saber Agha --- . Mohamad Adnan Basher --- Esra’a Abdul Salam Mahmood
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (Part-4) Pages: 108-124
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The use of fly ash as a sustainable material in concrete gained significant importance at present, due to its environmental and economic benefits. Besides, it may improve the long-term durability of concrete. This study presents the effect of moderate contents of fly ash as a partial replacement of cement on fresh and mechanical properties of cement mortar and lightweight foamed concrete. The results showed that the use of fly ash improved workability and reduced the density and water absorption of foamed concrete, while reduced the concrete strength at early age, however the concrete strength increases after 28 days.

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