Impact Resistance of Reinforced Concrete Beams Encased By Ferro cement
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 2
Abstract
Strengthening reinforced concrete beams by a thin layer of ferrocement gives favourable properties such as smaller crack spacing and width, greater toughness which increases their impact load capacity, excellent bond in contact surface, and superfluity of formwork. The purpose of the experimental program in the present work is to show the effect of combination of conventional reinforced concrete beam encased by a thin layer of ferrocement. In this work, the first part of the experimental program covers the effect of some variables that affect the application of ferrocement in strengthening of reinforced concrete beams that are subjected to impact loads. The effect of number of layers of wire mesh, thickness of ferrocement, shape of encasement, amount, fastening and distribution of skeletal steel, mortar strength and nature of bond between concrete and ferrocement are considered. In addition, two reinforced concrete beams were constructed with low compressive strength to investigate the behavior of ferrocement with more than one type of concrete mix subjected to impact load. 300 specimens and 1400 laboratory tests were needed to choose the nine parameters, that lead to study fourteen conditions through twenty rectangular reinforced concrete beams with dimension of 150x200x3000 mm. For example to study of the nature and effect of contact surface between the reinforced concrete beam and the skin of ferrocement, five micro beams were needed, the first beam with normal contact surface, the second with rough surface. Grease, polymer bonding agent and epoxy resin bonding agent were used for the other three beams. Testing thirty-five specimens led to choose the two most suitable conditions to study the full-scale beams according to the engineering requirement and economy. From the load/ or deflection versus number of the blows relationship, the usefulness of ferrocement encasement to improve the impact load resistance of rectangular reinforced concrete beams was observed. The reinforced concrete beams encased by ferrocement elements developed an impact resistance, which is up to 8 times that of the bare reinforced concrete beams, and the strength is almost dependent on the detailing of ferrocement composite.
Authors and Affiliations
Wail N. Al-Rifaie Ph. D, Abdulameer O. Attiya M. Sc
Keywords
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- EP ID EP437840
- DOI 10.9790/1684-1502047992.
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