Concrete cracking, Civil Engineering

Attached information shows construction details of a water tank. 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 way 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.

The following are events:

1. Tank Base poured (Temperature min 9.3, max 16.5°C)

2. North side of structure poured (including north wall, ½ east wall, ½ west wall & intermediate baffle) (Temperature min 17.4°C, max 30.6°C)

3. Formwork stripped (first sign of cracking through formwork tie bars)

4. South side of structure poured (including south wall, ½ east wall, ½ west wall, intermediate baffle & overflow weir) (Temperature min 14.1°C, max 22.5° C)

5. Formwork stripped (similar cracks to first pour noticed)

6. Water testing commenced and leakages detected.

Photograph of the cracks in concrete and water leakage are shown in pictures attached.

Drawings are also attached.

Your assignment is to identify the type of cracks and convince the reader of your report the conclusions that you have reached in your report.

(1) List all the possible type of reasons that may have caused these cracks

(2) Discuss the reasons for and against each type of cracks mentioned above;

(3) Arrive at a conclusion backed by logical arguments that the type of crack you consider is the most likely cause of the cracks found.

(4) Present calculations to back up your argument if possible.

(5) Having identified the type of cracks above, now discuss the how these types of cracks can be avoided in future in the same type of situations.

Posted Date: 2/19/2013 2:55:35 AM | Location : United States







Related Discussions:- Concrete cracking, Assignment Help, Ask Question on Concrete cracking, Get Answer, Expert's Help, Concrete cracking Discussions

Write discussion on Concrete cracking
Your posts are moderated
Related Questions
The transmission main from the well field to the community is 2500 ft, the velocity of flow at peak pumping capacity is 3.5 fps, water temperature is 10oC, and pH is 7.5. If free c

Q. A pipe or groups of bars be adopted as load carrying element of min-piles? The design of mini-piles someway differs from other traditional pile types. For example the design

Point of virtual fixity and critical length of lateral loading for piles Some engineers can get confused about the difference between the two terms which are point of virtual

from surveying to school building finish

Ask question #Minimum 100 words accepted2812539076# you

What is the smallest size of A325 bolts required for the two plates in tension noted below, assuming the thickness of each plate is 1.0-in. and the applied force at each end is P=2

Light-weight Aggregate Prestressed Concrete The use of  light-weight aggregate concrete for prestressed concrete construction is well established. The main advantage of  light-


ADVANTAGES AND DISADVANTAGES OF SINGLE FLUMESH BOUND