Pull out testing is normally performed to establish how strong the fixings are between a typical fixing and concrete and many other securing materials.
Even though materials used for bonding may be different, the actual testing principles remain the same for all types of fixings.
Pull out testing and tensile strength testing is usually performed because many factors which effect bonding of materials. The greatest concern is that weaknesses may not be noticed when only visual inspection is conducted.
Some of these factors are: degraded strength of the bonding material caused by low temperature, frost, or when contaminants infiltrates into the joint.
Another cause of poor surface bonding strength is as a result of smooth side walls.
The entire strength of the whole structure may be weaker so as to loose the integral strength of the structure due to the vital bonding materials fail. Ultimately, this may result in construction malfunctions leading to disastrous consequences. Pull Out Testing enables early diagnosis of such problems. Because of this, constructors can repair faults. Early fault detection mitigates future higher costs. This also gives an assurance of any fixings overall strength.
Push pull testing is conducted either on a wide test batch or a smaller intensive scale. Testing always entails duplication of the design maximum stress levels planned in construction as stipulated by the standards of the industry.
Push pull testing is a detailed stress testing study of the performance of bonded materials. If problems have been detected then pull out testing can be used to rapidly find out the scale of any problem.
Quicker pull out testing (larger sample testing) may be used under the circumstances where the financial feasibility of the large scale is far reaching and faults have been detected.
Pull out tests can quickly test more fixings and will only show the pass or fail of maximum loads being tested. The test methods are identical as push pull tests but only the pass or failure is recorded. Push pull testing is normally used to detect problems the quicker pull out tests will find out the extent of such problems.