ABSTRACT
Ultra-light
weight cement composite can be made by using a hollow cenospheres as micro
aggregates. Cenospheres are hollow spheres typically produced as a byproduct of
coal combustion at thermal power plants. These cenospheres are uniformly distributed
in the cement paste. The amount and density of these cenospheres affect the
property of ultra-light weight cement composite. The ULCCs had 1-day densities
ranged from 1154 to 1471 kg/m3 and 28-day compressive strengths
ranged from 33.0 to 69.4 MPa. The properties of the ULCCs were compared with
those of cement pastes with comparable water/binder and those of a concrete
with 28-day compressive strength of 67.6 MPa. ULCCs lead to the development of
low weight composite material with very high compressive strength and specific
strength. So ULCCs have a wide range of application such as flat slab system,
double skin composite structures, bridge deck and offshore structures etc.
ULCCs can also use for the construction of energy efficient buildings with a
good internal environment due to the low thermal conductivity. The construction
cost and transportation cost can be reduced due to the high strength to weight
ratio. The property of the ULCCs can enhanced by using ploy vinyl alcohol
fiber, shrinkage reducing admixture and viscosity modifying agent.
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