From ancient times to the present, the use of natural stone for construction and decoration in our country has a long history, and the stone culture also has a profound heritage in our country. However, since the 1990s, the stone industry is gradually falling into a vicious circle, that is, the thickness of large slabs on the market is getting thinner and thinner, from the full thickness of 20mm to the current 15mm, and even thinner to 12mm. Moreover, many people think that the thickness of the slab has no effect on the quality of stone products. Therefore, the thickness of the slab is not taken seriously. The thickness of the large slabs on the market is mostly around 16mm, or even thinner.
Does the thickness of the slab really have no effect on the quality of stone products? Picture of marble sheet The answer is obviously not no, and now many problems have begun to appear, such as: 1. The installed floor panels will crack or even break. 2. The board installed on the wall will be deformed and warped, and it will be broken when it is slightly impacted by external force. 3. After using the stair tread for a period of time, the front end protruding out is missing a piece.
4. The ground stone installed in the municipal square is often damaged, with a rotten piece here and slag there. 5. There are also many stone-decorated buildings, municipal squares, subways, stations and other crowded places where we often see a lot of stone damage. It can be said that it is the insufficient thickness of the stone that causes a lot of damage to many buildings decorated with stone.
Nowadays, various quality problems in many stone-decorated buildings are directly related to the thickness of the slabs. Stone people should be alert to the serious impact of stone thickness on the quality of stone products. foot. What impact will the thickness of stone have on stone products? 1. The thinner the board, the weaker the compressive capacity. The strength of the rock refers to the ability of the rock to resist damage. Under the action of external force, the rock will be destroyed when the stress reaches a certain limit value, and this limit value is the strength of the rock.
When the thickness of the plate is thinner, that is to say, the weaker the compressive capacity of the plate, the easier the plate is damaged; on the contrary, the thicker the plate, the greater the compressive capacity, the less likely the plate is broken and damaged. Under the action of external load, when the stress inside the rock reaches or exceeds a certain limit, the rock will be destroyed. Therefore, from this formula, it can be concluded that the compressive strength of the stone is directly related to the thickness of the plate: the plate is thin, the compressive capacity is poor, and it is easy to be damaged.
The plate is thick, strong in compressive capacity, and the plate is not easy to be damaged. 2. Disadvantages brought about by thin stone thickness It has become a trend and trend for stone merchants to sell thinner and thinner boards. In most large slab markets in Shuitou, you can generally see those slabs below 16mm, especially those with good materials and expensive stone merchants are more willing to make the thickness of the slabs thinner.
Because the stone is made too thick, the price of large slabs has risen, and customers think that the high price will affect sales when they buy. Making the thickness of the large board thinner can solve this contradiction, and both parties are willing. But doing so has brought a lot of evil consequences to the stone users, and has brought a great negative impact on the stone market.
① Fragile and cracked Natural stone, especially many natural marbles are full of cracks, and slabs with a thickness of 20mm are easily broken and damaged, not to mention slabs with a thickness far less than 20mm. Therefore, the most obvious consequence of insufficient thickness of the board is that the board is easily broken and damaged. ②The color of cement and other adhesives will seep back. When the stone is thin, the cement and other adhesives will pass through the cracks of the stone during construction and reverse seepage through the capillary pores on the stone surface itself.
This phenomenon is most obvious for white stone, jade-like stone and other light-colored stone. When the color of adhesive materials such as cement seeps back into the stone surface, it will greatly affect the surface effect. Make the originally beautiful stone become extremely ugly.
Traces of cement color can be seen on the surface of the stone. This is because the cement seeps back to the stone surface through the cracks on the stone surface. If the stone is thicker, it is impossible for the cement to seep back to the stone surface. ③ Poor bearing capacity The thickness of the granite used in the reconstruction of Tiananmen Square in Beijing was 100mm. The reason why such thick granite is used is that there are many people in the square and heavy vehicles have to pass by. The use of such thick granite has a large bearing capacity and will not be damaged under heavy pressure.
The surface of the Marco Polo Bridge has been trampled out of deep holes by horseshoes, but there is no damage in any place, which shows the high bearing capacity of the bridge deck stone. ④ Weak impact resistance There is a Chinese idiom: vulnerable to a single blow. Described as weak and unable to withstand a blow.
"Thick" and "thin" are words with opposite meanings, but they have different meanings for stone slabs: thick slabs have strong impact resistance, whereas thin slabs have weak impact resistance. ⑤Easily deformed and warped. Consumers who have used artificial granite for many years have reported that the deformation and warping of the granite, especially the deformation and warping of large-scale, long-length and narrow-width granite products are more serious. After analyzing the reasons, in addition to the quality problems of artificial granite products, there is also a very important reason that the thickness of artificial granite plates is not enough.
Almost all manufacturers of artificial granite slabs have higher competitiveness in the market in order to reduce the price of large slabs, and the thickness of large slabs is 16.5mm. The thickness of the plate is 16.5mm, and its bending strength is lower than that of the plate of 20mm. A domestic man-made stone production company clearly stipulates to the sales staff that the thickness of the plate must be 20mm when accepting orders for artificial stone floor plates.
When the customer insists on using the 16.5mm thick plate as the ground, the salesperson can refuse this project. Instead of dealing with various problems caused by the thin thickness of artificial granite afterwards, it is better to propose the stone thickness standard in advance to avoid quality problems such as deformation and warping of the stone after construction. ⑥Poor dimensional stability Dimensional stability refers to the property that the material does not change its external dimensions under the action of mechanical force, heat or other external conditions.
Dimensional stability is a very important technological index to measure the quality of stone products. Dimensional stability is related to the thickness of the stone: Thick slabs have relatively good dimensional stability; thin slabs have poor dimensional stability 3. Construction sites should pay special attention to stone thickness This article has explained the influence of slab thickness on the quality of stone products. Which thickness of stone decoration is better to use in building decoration should be analyzed in detail and cannot be generalized.
①The thickness of exterior wall products and indoor products should be treated differently. In the 1990s, the thickness of granite and marble slabs for stone exterior walls should not be less than 30mm. With the advancement of the times, the thickness of granite products for stone exterior walls has become 25mm, and in some projects even the thickness of marble has become 25mm. From a mechanical point of view, the thinning of the thickness of the exterior wall products means that the wind load resistance, impact resistance, and bending resistance are all declining, and it also means that buildings decorated with stone are full of various safety risks.
As long as the conditions are met, hidden safety risks may erupt at any time, leading to serious safety accidents. ②Granite and marble products should be differentiated in thickness. From the physical and chemical properties of rock, the strength, surface compactness, water absorption and other physical and chemical indicators of marble are all behind granite. Therefore, whether it is exterior wall stone or indoor stone, the thickness of marble products must be thicker than that of granite products to be safer and more reliable.
③The thickness of countertop products should be different between those with holes and without holes. Countertop products are more and more used in the decoration of buildings. From star-rated hotels, office buildings, government office buildings, and family houses, countertops can be seen everywhere. The thickness of the countertop has a great influence on the safety of the countertop. There are table tops with punching holes and non-drilling table tops. The thickness of the countertop is determined by the method of digging holes or not digging holes on the countertop.
The plate thickness of the table top with holes should be greater than that of the table without holes. Because the strength of the countertop is greatly reduced after the holes are dug on the countertop, the strength of the countertop can be improved by increasing the thickness of the countertop. However, although the strength of the table top can be improved through reinforcement, the process is complicated. It is better to increase the overall strength of the table top by appropriately increasing the thickness of the table top.
Marble with a thickness of less than 18mm is best not to be used for the processing of countertops. ④ The thickness of the countertop products should be different according to the installation method. The installation method of the countertop determines the thickness of the processed countertop board. The countertop adopts the bracket installation method, because the countertop relies on several support frames to support the countertop, and the support without support is the weakest part of the countertop, which is easily damaged under the action of external force or heavy pressure, resulting in broken products .
The thickness of the countertop used in the support installation should be thicker than the thickness of the countertop as a whole laid on the solid. Figure 4 is a suspended table top. The thickness of the table top of this installation method is thicker than that of the non-suspension installation.
Because the suspended part is the weakest part of the countertop, it is easy to break and damage from the suspended part under the action of external force or heavy objects. ⑤ Stair step products should be processed with stone with a thickness of not less than 30m. In many places, it has been seen that many stone-decorated stair step plates are cracked and the front end is damaged. The main reason is that the thickness of the stair treads is too thin.
At present, the stair treads of many buildings in China are mostly processed with plates with a thickness of less than 20mm, and some are even processed with plates with a thickness of 15mm, and the stone can only be thickened by adding edges. How can the strength of the stair treads processed in this way not be broken and damaged? At present, there are no absolute regulations on the thickness of stone materials used in building decoration. In order to obtain more profits, many manufacturers and merchants use their brains from the thickness of stone materials. However, the disadvantages of stone materials that are too thin have become a growing trend in the market. In order to stop this unfair business behavior, stone materials Everyone should be vigilant, not coveting the short-term list, making the stone so thin that it will harm the interests of customers and affect the reputation of the entire stone industry.