For rigid pavement, what are the advantages of using lean concrete sub-base
instead of traditional granular sub-base?
There are several shortcomings of using granular sub-base in concrete carriageway:
(i) Since sub-base is permeable, water can seep through sub-base and soil particles will be pumped out through contraction/expansion joints when subject to traffic load.
Consequently, voids are formed underneath the pavement structure and the concrete
pavement may crack under severe traffic loading.
(ii) Lean concrete increases the strength and renders the roads capable of carrying heavy traffic loads.
(iii) Due to workmanship problem, it may have uneven distribution of sub-base and this results in cracking of concrete carriageway when subject to severe traffic loading.
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