Abstract
The high demand of tensile strength in concrete is always a critical issue for engineers, as 10% of the compressive strength is not sufficient to withstand higher loadings. Lesser ductility and strain capacity is another major issue of normal concrete. In the queue of modern researches, this paper is an attempt to study Engineered Cementitious Composite (ECC) from research of Professor Victor Li, the University of Michigan. ECC is an ultra-ductile cementitious composite which is highly crack resistant, with a high tensile strain capacity over that of normal concrete. The composite replaces coarse aggregates and fine aggregates by sand and fly ash respectively. ECC is made up of OPC, sand (passing from 250 µm and retained on 150µm), Fly Ash (Class F) with addition of Polypropylene fiber on different percentages i.e. 0%, 0.25%, 0.5%, 0.75%, 1.0% were studied. Tensile Strength of ECC was measured by casting & testing cylinders of 4”x 8” in Universal Testing Machine (UTM). The experimental results revealed that 111.40% increment in tensile strength was found at 0.5% PP fiber at ECC 1:1:1 and an increment of 74.74% was observed at ECC 1:0.8:1.2 at 1% PP fiber. The study concludes that this composite could substitute the normal concrete where high tension is the ultimate requirement with higher strain capacity.
Highlights
Amongst all construction materials, concrete is most versatile material man have ever made
Based on results of experimental investigation conducted on PCC and Engineered Cementitious Composite (ECC) @ 1:1:1 and 1:0.8:1.2, the following conclusions are drawn:
ECC 1:0.8:1.2 attains highest value of indirect tensile strength at 1%, which is linearly increasing from 0% to 1% that is indicating that it would further increase
Summary
Concrete is most versatile material man have ever made. Another study used fly ash along with micro PVA fiber in ECC to investigate compressive strength, tensile strength and flexural strength. The study concludes that with same grade i.e. M35, the ECC has higher compressive strength, flexural strength and tensile strength as compared to same grade concrete [16]. The tensile strength of ECC remains same as of PCC while in other cases, it increases but up to little extent [7,8] The development of this material surely enhance the safety and durability of structure but tends to reduce long term burden of cost which, otherwise, would require for high degree of maintenance and causing environmental degradation due to extra material production. This experimental analysis of ECC on cylindrical specimens results in extreme increment of tensile strength which is ultimate goal of structural engineers
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