Assignment Task :

Question 1:

Due to the COVID-19 you are expected to stay home except for essential reasons, such as groceries shopping. When you venture out from your home, take a photo of a crack in a concrete element (e.g. part of a building, pavement, retaining wall or other concrete elements) and look at the surrounding area to see how the crack may have originated. Answer the following regarding the crack:

(1) Show a photograph of the crack

(2) What is the possible cause of the crack? Show a picture or diagram of cracks caused by similar causes from elsewhere (textbooks or internet) to back up your suggestion.

(3) What are the possible ways the cracks of this type can be avoided in the future?

 

Question 2:

Attached information shows the construction details of a water tank which was constructed late last year. The slab was poured in one pour and the walls (incl. Baffles) were poured in two even sections. Forms were stripped 3 days after pouring walls. The weather on these pour days was not extreme. The difference between the minimum to maximum temperatures were only 5 or 6 degrees. The cracking was identified through most holes allowed for formwork ties perpendicular to the wall thickness. The cracks were in vertical direction originating from the base to nearly half of the height of the external walls. The cracks appear to be wider near the base and narrowing with the height. The cracks appeared within the first week after the concrete placement, first noticed as soon as the formwork was removed

 

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  • Uploaded By : Grace
  • Posted on : April 28th, 2019

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