International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
AN EXPERIMENTAL STUDY ON MICROSTRUCTURE AND STRENGTH PROPERTIES OF HYBRID FIBER REINFORCED SELF COMPACTING CONCRETE SACHIN S1, RAGHAVENDRA D2 1PG
Student, Dept. of Civil Engineering, EPCET, Bengaluru, Karnataka, India Professor, Dept. of Civil Engineering, EPCET, Bengaluru, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------2Assistant
Abstract - Self-compacting concrete (SCC) is one of special
which can be effective in reduction of initial cracks of the concrete structure which also strengthens the concrete structure.
type of concrete gained popularity due to its higher workability compare to normal concrete, and at the same time because of its cohesiveness it can be able to flow itself on all corner of the form which results in reduction of vibration effect without segregation and bleeding. Use of industrial byproducts like GGBFS and Fly ash as cement replacement each of by 30% results in achieves an economical SCC but also reduces pollution created by these wastes. Use of combination of steel and polypropylene (PP) fibers in SCC mix of 0.5 %( 0.3% of Crimped steel fibers and 0.2% of PP fibers) has been tried which effect strength and other properties in different ways. To achieve better workability of SCC, Master Glenium Sky 8630 has been used and dosage of 1% for Plain SCC and 1.5% for hybrid SCC. The study has been done on M40 grade of concrete was designed using Nan Su method with watercement ratio of 0.40. Some of the tests conducted on slump flow, L and U box and V funnel to determine the parameters for self compactability of mixtures.
2. Materials used Cement: Ordinary Portland cement of mortar compressive strength at 28 days curing period of 53MPa has been used in the present study and specific gravity was 3.15. Fine aggregate: Local river sand has been used. The specific gravity, fineness modulus and bulk density of sand were 2.63, 2.73 and 1.356g/cc used respectively. Coarse aggregate: Crushed aggregate of maximum size of 12.5mm was used. The specific gravity, fineness modulus and bulk density of sand were 2.65, 6.36 and 1.33g/cc used respectively. GGBFS: GGBFS has been used as a 30% partial replacement of cement.
Key Words:
SCC, Compressive strength, Flexural strength, Tensile strength, Hybrid fibers, Scanning Electron Microscopic.
Fly ash: Class F fly ash has been used as a 30% partial replacement of cement.
1. INTRODUCTION
Super plasticizers: Master Glenium Sky 8630 is used. Optimum dosage is confirmed by various trail mixes.
Self-compacting concrete (SCC) is a type of concrete which is able to flow and compact under its own weight which doesn’t require any mechanical vibration and enough cohesive which is exceedingly flowable to be handled without segregation or bleeding.
Water: Potable water is used for mixing of concrete and curing.
3. Fresh State Properties of SCC
In 2001, Nan Su et al proposes design mix method on Self compacting concrete. Mainly it derives from using necessary quantities of aggregates and cement paste is mixed so that concrete that attains flowability, compactability and other important properties of SCC. To ensure these actions of SCC in terms of test conducted on compressive, flexural and split tensile strength and the results obtained will indicate that this methodology gives lucratively high quality of SCC. Dry shrinkage is one of the main shrinkage causes cracks in structures that affect the durability and strength of concrete structures due to change in the environmental moisture from the concrete. Addition of fibers used as reinforcements
Š 2017, IRJET
|
Impact Factor value: 5.181
The SCC should possess some important functions at plastic stage are as follows Filling Ability: SCC should fill up to every corner of formwork and where congested spaced reinforcement present and also at other places with maintaining homogeneity in horizontal and vertical directions of formwork. Passing ability: SCC should pass through congested formwork with closely spaced reinforcement area without interlocking between reinforcement and aggregates.
|
ISO 9001:2008 Certified Journal
| Page 2321