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Vincent Chu answers...... 
Should joints of concrete kerbs be in line with the joints in concrete carriageway?
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Vincent T. H. Chu is renowned internationally Photograph of vincent chuas walking encyclopedia of civil engineering. Author of a number of widely acclaimed civil engineering books, Mr Chu is recipient of various reputed awards including Young Engineer of the Year Award 2008 (Merit) by the Hong Kong Institution of Engineers &  Ombudsman’s Award 2007 (under complaint-related category). He is also listed in 11th Edition of Marquis Who's Who in Science and Engineering. ConcreteBasics.org thanks him for his exemplary contribution to the cause of civil engineers around the world.
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In normal practice, joints are provided in road kerbs to cater for concrete expansion and contraction.  

However, the location of joints in kerbs is not arbitrary and they should match with joints in concrete  carriageway. Otherwise, it is very likely that cracks may form in concrete kerbs at location of pavement joints.

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Reference: 200 Questions and Answers on Practical Civil Engineering Works by Vincent Chu
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