SFRC

This study shows experimental investigation
conduct of interior beam-column joints made from hybridconcrete; (normal concrete
and steel fiber reinforced concrete) or hybrid reinforcement; (steel and externally
CFRP bars by NSM technique).
nine hybrid reinforced concrete beam
repeated loading with pre
three groups to investigate
column connection region such as:
hybridization (hybrid concrete or hybrid reinforcement), area of hybrid concrete,
angle of orientation for NSM
technique. The results showed that using the hybridization technique of concrete at
different areas of BCJ under static loading, exhibited improvement in ultimate and
first cracking loads about (5
homogenous NC joint with inc
technique under repeated loading condition showed increasing in ultimate load about
(15%) with improvement a cumulative ductility about (17%). As well as, the joint
enlargement technique by using SFR
cracking loads about (28%) and (50%), respectively.
CFRP bars as external hybridization system (65% of secondary reinforcement at
angle 45°) under static loading is improved the fi
about (100) % and (10)%, respectively
compared with the steel reinforced joint
loading condition does not effect on
ductility about (8%). NSM
decreased the first cracking and ultimate loads about (25)% and (11)%, respectively
with the improved ductility about (31%)
Using reinforcement hybridization technique altered the mode of failure from brittle
shear failure to ductile flexure under both loading conditions due to effectiveness ofthis technique in enhancement of the failure mode. As well as, external reinforcement
system for two faces of joint is reduced the congestion of reinforcements and
formation of diagonal cracks are decreased too. In FEM analysis, ANSYS computer
program version (14.5) was utilized and the numerical and experimental results had a
reasonable agreement

Nowadays, the application of steel fibers in concrete has increased gradually as an engineering material. The knowledge is not only necessary to provide safe, efficient and economic design for the present, but it also to serve as a rational basis for extended future applications. In this study, steel fibre reinforced rigid pavements are analyzed for stresses developed due to Moving loads & temperature differentials. Comparison of curling stresses in SFRC with conventional concrete is carried out. All the models are generated and analysis is carried out using the ANSYS software. Parametric study for the effect of change in slab length & slab thickness of pavements on curling stresses is also done. Curling stresses due to Linear & Non linear temperature distribution in top & bottom layer of SFRC pavement slabs are also calculated. Frictional stresses in SFRC due to uniform temperature differential are almost same as conventional concrete. Analysis results shows, SFRC develops more stresses as compared to conventional concrete & Non linear temperature distribution develops more stresses than linear temperature distribution. SFRC pavements are analyzed for Single axle moving loads for two different speeds. Results reveal that the loading stresses are higher, when the loads are at starting position of edge.

The present investigation carried out on concrete due to the effect of silica fume with and without steel fibers on ordinary Portland cement. In this study we used concrete mixes with Silica Fume of 0%, 4%, 8%and 12%, with addition of crimped steel fibers of diameter 0.5 mm Ø with a aspect ratio of 60, at various percentages as 0%, 0.5 %, 1.0 % and 1.5 % by the volume of concrete on M30 grade of concrete. The effect of mineral admixture (silica fume) as cement replacement material with and without steel fibers on mechanical properties were analyzed and compared with normal concrete. In comparison, with normal concrete the replacement of 4%, 8% and12% cement by silica fume showed 7.27%, 15.64%, 12.79% increase in compressive strength in 28 days of curing. . In comparison, with normal concrete the replacement of 4%, 8% and12% cement by silica fume showed 6.21%, 6.52%,6.36% increase in split tensile strength in 28 days of curing. In comparison, with normal concrete the replacement of 4%, 8% and12% cement by silica fume showed 14.59%,20.43%,19.70% increase in flexural strength in 28 days of curing. Preset for both economical and strength aspects.