Profiling Hollow Brick Leakage Preventability Wall And Its Crack Prevention Study

Horizontal and vertical mortar joint running due outside and due inside whenbuilding with square brick,leakage may probably occur because of mortar unsaturated.the author aim at a profiling hollow brick developed by Fuzhou Ke –Leng company,explain its different shape which can prevent leakage when it is used to build a wall。In order to approve its advantage of leakage preventability,we make an experimentwith the profiling hollow brick wall and common hollow brick wall respectively inthis paper。As a result the author find that the leakage preventability capability ofprofiling hollow brick wall is greatly better then the common wall. We also do an experiment to estimate the reliability of applying the profilingbrick to practice. In this paper we experiment with nine specimens,six for bendingresistance;three for shearing resistance,then we compare the test result with the dataof the ordinary wall,and we find the conclusion that the bending and shearingresistance ability of profiling brick wall is better then the ordinary wall. The key to the reason why the profiling brick wall is water proofing is thatrun-through crack cannot be formed during the course of the building. But otherreasons such as the temperature load,foundation settlement,can usually lead torun-through crack,which will be the channels of leakage. In order to study thedevelopment rule of the crack appear in the profiling brick wall we firstly analyses themechanism of crack appear in ordinary wall and calculate the stress in the wall whenit is under the situation of temperature changes,shrink,foundation settlement,theresult will be testified by three examples. Secondly we setup element model,whichwill be used to analysis the crack development rule of ordinary wall under variousconditions,the author`s summarizes is approximately coincide with the engineeringpractice. Based on this conclusion the author setup six profiling brick wall model ,threemodel used to analysis stress under deformation variations caused by changes oftemperature and three caused by different settlements. Through different load valuethe author get the relation between the load and the principle stress. By the conclusionwe can prevent crack by control big or small of temperature changes or settlements.