What is the significance of bond strength?

Because mortar is a whole with the collective, such as plastering mortar and wall materials bonded together to form a wall, and ground mortar bonded together to form a floor, some of which are directly used for bonding. For example, masonry mortar is to bond all kinds of bricks and blocks into a whole, that is, masonry. Ceramic tile binder is used to bond ceramic tiles to the wall or ground, so bonding strength is a very important performance of mortar. Only when the mortar itself has a certain cohesive force can it be effectively bonded with the base and maintain this stability for a long time; Otherwise, mortar is prone to quality problems such as hollowing, cracking and falling off under the action of tensile stress or shear stress caused by various deformations. Most mortars have bond strength requirements, such as plastering mortar, tile binder, interface mortar and self-leveling mortar. The test methods of mortar tensile bond strength are stipulated in many industry standards, but the test methods are different, which leads to a variety of different test methods in a technical standard, and there is no good coordination between standards. At present, there are many methods to measure tensile bond strength, and their measuring principles are basically the same. The mortar is coated on a certain size of matrix, and then the tensile bond strength is measured by tensile method, but the matrix test block, coating thickness and primary molding times used in the test are different. Such as plastering mortar, interface treatment mortar, polymer cement waterproof mortar, external thermal insulation bonding and plastering mortar, putty, etc. , 70mm×70mm×20mm cement mortar test block as the base block, forming one test piece at a time; However, self-leveling mortar, ceramic tile bonding mortar, etc. The matrix block concrete slab is used, and the 10 test block is formed at one time, and nothing else is added. This leads to confusion in the testing method of mortar tensile bond strength, which brings inconvenience to operators and increases the investment of instruments and equipment.