Concrete cracking, Civil Engineering

Assignment Help:

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.


Related Discussions:- Concrete cracking

Determine the final stresses in the bolt, Determine the final stresses in t...

Determine the final stresses in the bolt: A steel bolt of diameter 12 mm and length 175 mm is used to clamp a brass sleeve of length 150 mm to a rigid base plate as in Figure.

Spun pipes, what is flush joint and confined joint in rcc spun pipes?

what is flush joint and confined joint in rcc spun pipes?

Steel, A No 10 steel rebar is tested in tension by monitoring the load read...

A No 10 steel rebar is tested in tension by monitoring the load reading of the testing machine it was found that the specimen yielded at aload of 41600lb and fractured at 48300 lb

Corrosion protection of lifting anchors in precast concrete, Q. Corrosion p...

Q. Corrosion protection of lifting anchors in precast concrete? Corrosion of lifting anchors in precast concrete units has to be prevented since the corroded lifting units caus

SURVEYING II LAB, Explain Designation of bearings. Calculate included angle...

Explain Designation of bearings. Calculate included angle from bearings

Common building stones, Common Building Stones Here describe some commo...

Common Building Stones Here describe some commonly used stones are following: a. Granite       b. Basalt and trap c. Slate          d. Sand stone   e. Marble        f.

Strength of materials, distribution of shear stress in triangular section

distribution of shear stress in triangular section

Flash point test, Flash Point Test: The flash point is the temperatur...

Flash Point Test: The flash point is the temperature at which the bitumen gives off vapours which ignite in the presence of a flame. The flash point temperature gives the cri

Concrete technology, what is the actual quantity of water to be mixed in va...

what is the actual quantity of water to be mixed in various grade of concrete and also the size of gravel to be mixed with in RCC work. Also I want to know the difference between a

Fluid mechanics, How a water bound macadam road is maintained

How a water bound macadam road is maintained

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd