Prevention of stone water spots (stains) pollution proposal

Traditional stone wet installation process is simple, easy operation, low cost, currently still in the stone widely used in the installation. Thus, after the installation has also brought many stone lesions prone to complications, the most obvious is the stone for long periods of dry or dried water spots left by water marks of the phenomenon. Especially light-colored stone, a variety of different shapes, different sizes, there are wet, there are dry, there are dark, with light water spots stubbornly entrenched in buildings on the surface, very ugly. This phenomenon is known as water spots (stains) quit. This question is still plagued many owners of units, construction units and stone suppliers, and stone production plant, and many other relevant units and departments.
In this paper, we have encountered in working in the water spots (stains), as well as treatment methods, analysis for your reference.
(A) cause water spots (stains) quit reasons
1, different varieties of stone; occurrence of water spots (stains) quit a light-colored stone to stone, mostly white, mostly granite materials. Gray and white granite material, for example; characterized by acidic igneous rocks, a higher degree of crystallinity, crystal micro-cracks between the rich, higher water absorption, a variety of metal mineral content is relatively high. Based on these characteristics, be installed in the shop when the wet cement of the alkaline substance is the amount of water into the stone within the relatively large, easy to metal and stone in the mineral chemical reaction to produce alum class, salts The so-called water crystals, present in the cleavage between the rock and crystal between the cracks, under normal circumstances is difficult to evaporate and dry the stone show the long-term flooding in the state image.
2, the protective agent to use or improper use of species selection. Protectant many varieties available in the market, should be for different stone, different use of the site, different paving methods, the selection of different protective agent, it is often overlooked. More importantly, the construction methods and use of rational choice, often found within the same building facade or ground area, using the same stone (with a large base to the plate), the same cement, sand, construction condition, in even is the same piece of stone on the water there are different spots (stains) quit the appearance that some dry stone, and some wet. This is basically the use of stone by the use of protective agent but no serious result of the operation required in the protective agent usage, and brushing uniformity are very different. Enough according to the ratio requirements, and even brushing the stone, quickly dry. On the contrary, are prone to water spots (stains) quit phenomenon.
3, the stone pavement of cement, sand and water to control the selection of water spots and yellowing stone has a great impact. We have encountered the use of white cement, white sand child, light-colored stone pavement, the result is water spots, large yellow stone appear after repeated treatment was basically restitution. In the construction of the cement alkali content, manganese, iron content, amount of soil containing sand (impurity mass), the amount of water, are to be strictly controlled. Will certainly be subject to different procedures of the Stone Baptist diffuse pollution.
(B) [water spot stains appear) quit method of governance
We must first distinguish between what causes water spots (stains) quit. If Shek below, there are a lot of water (such as: pavement is completed, the cutting machine cut the ground water; in the pavement before the ground full of water; installed by the large amount of water infiltrated between patchwork, etc.), so this should be honeycomb-like dry cement overlay was water saturated, the ground should be used for this dry method, or a long-time natural drying, so that ply the water evaporated in the cement, and then the stone itself to govern . If the indiscriminate use of chemical cleaning at this time, tend to increase the Baptist diffuse phenomenon. The reason is simple, clean to water, the water will never wash off the water, only evaporation is reasonable. Heating method was used, if using hot air drying method is possible, but not many large-scale applications; and the use of fire, light roast and other methods, the effect is not ideal, these methods are able to rapidly increase Stone surface temperature can not be long-term increase in cement overlay temperature, evaporation of water is not too obvious, while the negative effects are great. As the heat causes rapid swelling Peng stone, and concrete overlay layer caused by hollowing phenomenon, sometimes resulting in stone Alice bent, resulting in notches, consequences are difficult to artificially control is not recommended for use.
According to our management experience, light-colored granite materials related pollution in the clear understanding (through research and detailed analysis is to understand clearly) cement overlay is not really the case of water saturation can be the appropriate choice of granite cleaning agent at l: 1 ratio of detergent is blended with deep marble CHJ, then l: 1 is blended with water, washing machine full use of heavy cleaning, decomposition of the chemical solution into the stone cracks and cleavage between the crystal water crystallization and the crystallization of metal salts, In half an hour to 2 hours with water cleared. This method should pay attention to two points, first place can not leak into the stone too much patchwork of chemical solution (if the amount is small you can not care about), so as not to hurt the cement layer of corrosion; second is washed with water, must be dry in time, can not leak into the patchwork of stone, concrete overlay to increase the water content. The principle of this method is very simple: to destroy the stone cracks and cleavage between the crystal water crystals, metal salts, while the role of micro-explosion produces the airway open the stone to speed up the evaporation of water, stone water is steamed off and dry, rather than being washed dry. This method is generally within a few hours there is further reason for the surface effect :3-7 days had a marked effect. If effective, but not any completely eliminated, further analysis is necessary for two reasons: First, concrete overlay containing water is too high? Second, the use of chemical solution is not enough? To do the second.
(C) the prevention of stone water spots (stains) pollution proposal
1, carefully selected repellant, we recommend using silicon-oxygen water repellant and CHJ CHJ stone plus bottom repellant, if the conditions can be both protective agent handle stone bottom and side, keep a positive not do it, etc. After the stone is completely dry and clean in front of anti-fouling agents do CHJ8765 composite processing. Meanwhile, we must adhere to a principle: to do it carefully by stone protection methods of operation, use good, or better to do.
2, the choice of a good cement, sand, try to choose a large cement manufacturer brand names (often small cement production unit is not subject to the control of a variety of impurities); to select a Portland cement, such as non-use sulphoaluminate (white cement ) can not, should be used in super white cement, because only this level of white cement, manganese, iron content is controlled. Sand, washed sand as we choose, and some miscellaneous straight sand unimaginable high quality, it was flooding out of the pigment and impurities will be brought into the stone and pollution stone.
3, the strict control of water is actually wet pavement stone semi-dry pavement, and some pavement work in the last shower mortar, no control, so this should be semi-dry cement mortar into the wet sand Prize, but some pavement is the last direct water spray, the more feasible, and too much water, the stone itself the possibility of contamination. Recommended including the underside of stone slurry method, that is, including boards, including the dentate pulp, you can maintain the squeegee quantitative (help flatness), but also reduce water, reduce pollution of stone has been to improve the quality of the decoration.
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