30th Our World in Concrete and Structures (OWICs) - 2005
S M Gupta*, National Institute of Technology, Kurukshetra, India
V K Sehgal, National Institute of Technology, Kurukshetra, India
S K Kaushik, Indian Institute of Technology, Roorkee, India
Shrinkage high strength concrete, fly ash, silica fume & superplastizers
This paper presents the results of an experimental investigation carried out to
evaluate the shrinkage of High Strength Concrete. High Strength Concrete is made by
partially replacement of cement by flyash and silica fume. The shrinkage of High
Strength Concrete has been studied using the different types of coarse and fine
aggregates i.e. Sandstone and Granite of 12.5 mm size and Yamuna and Badarpur
Sand. The Mix proportion of concrete is 1:0.8:2.2 with water cement ratio as 0.30.
Superplasticizer dose @ of 2% by weight of cement is added to achieve the required
degree of workability in terms of compaction factor.
From the test results of the above investigation it can be concluded that the
shrinkage strain of High Strength Concrete increases with age. The shrinkage strain of
concrete with replacement of cement by 10% of Flyash and Silica fume respectively at
various ages are more (6 to 10%) than the shrinkage strain of concrete without Flyash
and Silica fume. The shrinkage strain of concrete with Badarpur sand as Fine
aggregate at 90 days is slightly less (10%) than that of concrete with Yamuna Sand.
Further, the shrinkage strain of concrete with Granite as Coarse aggregate at 90 days
is slightly less (6 to 7%) than that of concrete with Sand stone as aggregate of same
size. The shrinkage strain of High Strength Concrete is also compared with that of
normal strength concrete. Test results show that the shrinkage strain of high strength
concrete is less than that of normal strength concrete.