USE OF SELF COMPACTING CONCRETE IN MASS HOUSING WITH CRUSHED SAND AS FINE AGGREGATE AND SNF BASED SUPER PLASTICIZERS

V.Umamaheshwaran, L.S.Kannan

Abstract: The Indian construction industry is growing at a rapid pace to meet the housing and other infrastructure requirements. Our central government is also looking at housing for all by the 2020. However the question is are we doing the sustainable quality construction at all levels to meet the demand from various classes of people. And the other important parameter to be looked into is time required for constructing these structures. Here the modern construction methods comes in help to meet both the criteria of faster and durable construction. One such construction method for mass housing is the concept using shear wall technology. Here the entire structure is constructed with concrete with all the utilities in built in it. The concrete to be used in such structures should be of self-compacting in nature because of the thin walls and heavy reinforcements. The thickness of walls vary from 75mm to 200mm. This walls are constructed along with the slab so that the structure is monolithic. The special requirement for concrete used in this type of structure is that the ultimate strength of concrete can be in the ranges of 25 to 30 N/mm2 but needs about 15 N/mm2 for removal of formwork. Thus the concrete should be robust in nature which can be made with the locally available materials and also economically viable. A concrete for this should be self- compacting which meets the requirements of EFNARC 2005 and also practically suitable according to the site needs. The concrete is designed considering the above parameters and successfully implemented across various project sites in India. The fresh concrete properties such as flow, flow retention, placing and hardened concrete properties such as compressive strength, Modulus of elasticity, good finish are studied across various project sites.

Keywords: Self Compacting Concrete, Crushed Sand, Admixtures, And Mass Housing

DOI: https://doi.org/10.15623/ijret.2016.0532035