Should lean concrete base and concrete slab be bonded together?
Posted in Highway Engineering |
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There are two schools of thought regarding the suitability of bonding between lean concrete base and concrete slab. The first one considers it undesirable to bond them together to minimize reflection cracking in the slab. In essence, bonding would cause cracks in lean concrete base to reflect through the concrete slab which may lead to premature cracking. Hence, bond breaking is achieved by applying wax curing compounds on lean concrete bases.
The other school of thought is to promote bonding between lean concrete base and concrete slab by treating the base with a rough texture to promote bonding to the slab. They consider that debonding lessens the lean concrete base’s structural contribution to the pavement and increases stresses due to curling and warping.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
basically lean concrete increase bearing capacity of soil and avoid more settlement of soil