Assignment 2 CVE80006 Infrastructure Deterioration Modelling Concrete Crack Diagnosis Assignment The phenomenon of cracking in concrete may depend on several factors such as the amount of loading, rate of bleeding, amount of stress and strain generated in concrete, the composition of concrete and method of fabrication. The cracking of concrete has become severe due to advance construction process which demands high strength structure requiring an increase in stress, strain, and deflection resistance. The cracks in concrete are mainly classified as structural crack and non-structural crack. Structural Crack - Shear Crack and Extra Compression Loading Crack Figure 1. Shear Crack Figure 1 is an example of shear crack found at Swinburne
Internal stress in building components could be compressive, tensile or shear. Most of the building materials that are subject to cracking, namely, masonry, concrete, mortar, etc. Are weak in tension and shear and thus forces of even small magnitude, when they cause tension or shear in a number, are able to cause cracking. It is possible to distinguish between tensile and shear cracks by closely examining their physical characteristics. 1.4 ALLOWABLE WIDTH OF CRACKS:- Cracks may appreciably vary in width from very thin hair cracks barely visible to naked eye (about 0.01 mm in width) to gaping cracks 5 mm or more in width.
Room 2317 A strange phenomena accompanies the room of 2317, the feeling of being so used to a place but have only been at the school for barely a month now. 2317 finds its home at 101 Academy Drive Buzzards Bay, MA 02532 on the 3rd floor of 2nd company, room number 17. Nestled in the corner of shaft alley and the women's bathroom, directly across from the DC locker. Approximately 43 steps in from the door to the stairs, up 43 stairs, then another 120 steps to reach its destination. The familiar sound of the alarm going off at 5:20 as the room resurrects from the night's sleep.
Observation #1 Mrs. Kirsty L. Horst Life Skills at James Buchanan High School Physical Arrangement: I arrived at Mrs. H’s classroom at the end of homeroom right before the bell rang for first period. The first thing I noticed was how large the room was. It was about twice the size of a normal classroom. On the front wall is a whiteboard that spans the whole length of the room. On the first section of the whiteboard near the door are the class calendar and large-print signs with the login information for Moodle and GoogleDocs.
Structural components around the expansion joint would be severely damaged and there shall be a chain reaction of forces in the total structure for which the structure has not been designed. These cracks can be easily observed by just going around Delhi and Gurgaon and various cities of Gujarat. The damage caused in the recent earthquake by the seismic forces in the high rise residential and commercial buildings at the position of expansion joints is clearly visible and indicates to the gravity of the
This excess water also greatly reduces the strength of the concrete. Cracks in con-crete occur due to various mechanisms such as shrinkage, freeze-thaw reactions and mechanical compressive and tensile forces. Structural cracks in residential founda-tions usually result from settlement or horizontal loading. Most (but not all) struc-tural cracks resulting from applied loads are nearly horizontal (parallel to the floor) and occur 16” to 48” from the top of the wall. They are much more prevalent con-crete block construction.
Although these methods increase the tensile strength of concrete members, the inherent tensile strength of concrete is not increased. When the concrete is loaded the micro cracks called ‘first crack’ develops. This leads to inelastic deformation of concrete. It has been found that addition of small closely spaced and uniformly dispersed fibers having very small diameter and length would act as crack arrestor and improves the dynamic and static properties. This type of concrete is called fiber reinforced concrete.