Abstract
The development of new building materials, able of absorbing more energy is an active research area. Engineering Cementitious Composite (ECC) is a class of super-elastic fiber-reinforced cement composites characterized by high ductility and tight crack width control. The use of bendable concrete produced from Portland Limestone Cement (PLC) may lead to an interest in new concrete mixes. Impact results of bendable concrete reinforced with steel mesh and polymer fibers will provide data for the use of this concrete in areas subject to impact loading. The experimental part consisted of compressive strength and impact resistance tests along with a result comparison with unreinforced concrete. Concrete samples, with dimensions of 100×100×100mm (cubes), and 500×500×50mm (slabs), were poured and were treated at ages of 28, 56, and 90 days. The compressive strength increased by 36.11%, 45.5%, and 52.4% respectively, whereas the impact resistance for samples reinforced with steel mesh and polypropylene fibers gave superior results to the conventional mixes.
Highlights
In comparison with other building materials, concrete is more practical, durable, and economical [1]
The compressive strength test was conducted according to the British standard B.S.1881: part116 [14] by using 3 cubes specimens with dimensions of 100×100×100mm and with a testing machine of 2000KN capacity with loading rate of 2.5MPa/s, at a position perpendicular to the direction of casting (Figure 1-2)
Compressive strength increased by 36.11%, 45.5%, and 52.4% over the traditional mixture at the age of 28, 56, and 90 days of water curing respectively
Summary
In comparison with other building materials, concrete is more practical, durable, and economical [1]. Attempts have been made to reduce cracks and improve the tensile properties of concrete members by using traditionally reinforced steel bars and through the application of restraining techniques. Both methods provide more tensile strength to the concrete members, they do not increase the tensile strength of the concrete itself. In normal concrete and similar brittle materials, fine structural cracks develop even before loading due to drying shrinkage or other causes of volume changes. Upon loading, these micro cracks spread and open due to the stress concentration effect [5]. The associated high fracture toughness and controlled slit width (typically less than 100μm) make ECC an ideal material for improving the serviceability and durability of infrastructures [8]
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