The true density of the travertine itself is relatively high, but due to the existence of a large number of holes, the bulk density is low, the water absorption rate is increased, and the strength is lowered. Therefore, the physical property index is lower than the normal marble standard. Due to the large number of natural defects such as texture, mud lines, mud bands, cracks, etc., the material has poor performance uniformity. In particular, the dispersion of the bending strength is very large, and the large bending strength can be more than ten megapascals, and the small one is less than one megapascal, and some may break during the handling process, which may cause work accidents.

Natural defects are also the main cause of poor frost resistance of this material. Many samples have been frozen into a pile of gravel when the performance of 25 freeze-thaw cycles has not ended. This kind of stone belongs to the carbonate structure of limestone, which is poor in carbonation. It is used in areas with heavy pollution in Asia, acid rain erosion will be very serious, and it will accelerate the destruction of stone. There are many reasons why this material is used on the wall, especially the dry hanging method is used on the outer wall in a large area, which has a very high risk.

Imagine that thousands of pieces weighing tens of kilograms to hundreds of kilograms are suspended in the air in high altitude. It is inevitable that there will be individual undiscovered and problematic plates, which are eroded by acid rain, wind and sun, and hot and cold. Under the harsh weather conditions, there will be a possibility of falling at any time, and there will be great safety hazards in stone engineering. Therefore, such projects need to work together from production companies, construction companies, supervision units to the construction of Party A, strictly control, and increase preventive measures to ensure that the project is safe. The hole problem is a natural feature of travertine and a weakness of its safety performance.

The existence of a large number of holes not only causes the water absorption rate to rise, the strength decreases, but more importantly, the weather resistance of the material is poor. The freezing cracking of the sample in the freeze-thaw test is often performed, and the temperature is -20 ° C to 70 ° C according to the American standard. After 150 cycles, the travertine has been completely unrecognizable. Therefore, when using it outdoors, it is necessary to select a suitable binder material to fill the hole, and at the same time choose a suitable protective agent to protect it, in order to effectively alleviate the impact of bad weather. The travertine itself contains a large hole of more than ten centimeters and a small size of less than 1 millimeter. The stone manufacturer will repair the large holes with gravel and adhesive during the repair of the wool board, and the small holes on the back will Filling by bonding the backing net generally leaves small holes on the front and sides. Special care should be taken during use. No large holes or holes filled with adhesive should be placed near the dry hanging groove and the back bolt hole. It should be selected on a dense natural material. If it is avoided, it must be replaced.

Although the current construction specifications in China do not support the use of stone like travertine in the external wall dry hanging project, in view of the commercial needs and the successful experience of foreign countries, more and more construction projects use travertine. Adapted to the needs of a multicultural development. Correct understanding of the travertine, and after the expert's technical approval, based on sufficient safety considerations and design, through strict quality control to reduce safety risks, travertine can be well placed on the decoration of the building, making this ancient The building materials are full of modern civilization.

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