Techno Press
You logged in as

You have a Free online access/download for a limited time.
Advances in Concrete Construction   Volume 7, Number 3, May 2019, pages 143-150
DOI: https://doi.org/10.12989/acc.2019.7.3.143
 
Effect of steel fibres and nano silica on fracture properties of medium strength concrete
A. Ramachandra Murthy and P. Ganesh

 
Abstract     [Full Text]
    This study presents the fracture properties of nano modified medium strength concrete (MSC). The nano particle used in this study is nano silica which replaces cement about 1 and 2% by weight, and the micro steel fibers are added about 0.4% volume of concrete. In addition to fracture properties, mechanical properties, namely, compressive strength, split tensile strength, and flexural strength of nano modified MSC are studied. To ensure the durability of the MSC, durability studies such as rapid chloride penetration test, sorptivity test, and water absorption test have been carried out for the nano modified MSC. From the study, it is observed that significant performance improvement in nano modified MSC in terms of strength and durability which could be attributed due to the addition pozzolanic reaction and the filler effect of nano silica. The incorporation of nano silica increases the fracture energy about 30% for mix without nano silica. Also, size independent fracture energy is arrived using two popular methods, namely, RILEM work of fracture method with P–u tail correction and boundary effect method. Both the methods resulted in nearly the same size-independent GF irrespective of the notch to depth ratio of the same specimen. This shows evidence that either of the two procedures could be used in practice for analysis of cracked concrete structures.
 
Key Words
    steel fibre; nano silica; mechanical properties; fracture properties; durability
 
Address
A. Ramachandra Murthy and P. Ganesh: CSIR-Structural Engineering Research Centre, Chennai, 600113, India
 
References
    -acc0703002-
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2020 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: technop@chol.com