As
utilization of natural aggregates has been increased, synthetic lightweight
aggregate production from environmental waste is a feasible new source of
structural aggregate material. Structural grade lightweight concrete use has reduced
considerably the self-load of a structure and permit larger precast units to be
handled. In this paper, the mechanical properties of a structural grade
lightweight aggregate made with fly ash and clay will be presented. The results
shows that water absorption of the green aggregate is large but the crushing
strength of the resulting concrete can be high. The 28-day cube compressive
strength of the resulting lightweight aggregate concrete with density of 1590
kg/m3 and respective strength of 34 MPa. The use of green lightweight aggregate concrete in
prefabrication of concrete elements is also considered.
Ali Shokati Sayyad
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