Outdoor marble facings are subject to frost, snow, and freezing all year round. As the use time continues to increase, the number of freeze-thaw cycles experienced increases, which can easily cause marble facings to crack. Due to the poor quality of marble, many color patterns, or improper inlaying, the upper and lower gaps on the wall are left less, and it is often affected by various external forces, resulting in irregular cracks in the dark seams of the color patterns or other hidden injuries. The main reasons for cracks are as follows:
(1) In addition to the color lines, dark seams or other hidden flaws of the marble, and improper grooving and grooving damage, after the external force of the structural settlement compression deformation, due to the stress concentration, the external force will exceed the weak strength of the block. The marble wall cracked.
(2) When the marble is installed on the outer wall or close to the room with high humidity such as the kitchen, the toilet and the bath, the installation is rough, the joint grouting is not strict, the corrosive gas and air penetrate into the joint, so that the embedded iron parts are damaged. Corrosion, swelling, giving the marble slab an outward thrust and cracks.
(3) When the marble slab is installed on the wall or column surface, there are fewer gaps between the upper and lower sides. When the structure is deformed under pressure, the marble veneer will be subjected to vertical pressure, which will also cause cracks.
According to the main causes of cracks, the following treatment methods should be adopted:
(1) When installing marble veneers on load-bearing structures such as walls and columns, the installation should be done after the structural settlement is concealed, and a certain gap should be left when installing marble slabs on the top and bottom to prevent structural compression , The marble facing directly load-bearing is cracked.
(2) The seam for installing the marble should be no more than 0.5～1mm, the caulking should be tight, the grouting should be full, and the block should not have defects such as cracks, missing edges or corners, so as to prevent the intrusion of corrosive gas and humid air; corrosion pre-buried Iron parts cause cracks on the board surface.
After the marble cracks, it needs to be repaired quickly to prevent the stone from falling due to the stone cracks, which may affect pedestrians, or directly affect the shape and quality of the building
