Analysis of the Causes of Waterproof Coatings in Waterproof Construction
Waterproof coating is a new material widely used in industrial and civil buildings after asphalt waterproof and mortar waterproof. This kind of coating is composed of various synthetic polymer waterproof coatings and caulking materials. Some of them are coated with only a few layers of coating film. Some of them are glass fibers, synthetic fibers or non-woven reinforcement cloths to form a kind of coating. Enhanced paint waterproof layer.
Because the waterproof material for coating film generally has good material properties, good waterproof property, strong adhesive force and extensibility, it can be applied under normal temperature and can be applied to a variety of complex shapes of the structure base layer, which is particularly beneficial to the yin and yang angles and undrained rainwater. The closure of the mouth and ends. Therefore, it has been developing in the near future.
However, judging from the effect of use in recent years, the quality of the film waterproofing project cannot be ignored. The relevant issues are now described as follows:
1, and the construction surface can not be completely close to the coating waterproof Currently used solvent and water emulsion type, solvent-based waterproof material used more, such as neoprene waterproof coating, reclaimed rubber asphalt waterproof coating, they can be sprayed or brushed alone Can also be used with glass fiber cloth, water emulsion type waterproof coating is also widely used, there are some waterproof coatings based on rubber or resin, such as neoprene, Hypalon coating, polyurethane coating, etc. are also excellent The performance, weather resistance and stability are more reliable. However, in practice, it is prone to occur that the surface of the construction surface cannot be completely adhered to. If the coating film cannot be closely attached to the construction surface, it will not be waterproof. The main reason for this is that the construction surface is not dry and is related to the ambient temperature during construction.
2. Whether the coating film thickness unevenness waterproof effect can be achieved depends on whether or not the uniform thickness is obtained after the conjunctiva and whether the construction surface of the cement mortar is smooth and smooth. As concrete and cement mortar allow certain errors during the construction process, this results in non-uniformity of the coating thickness.
3. Dry cracking of concrete due to structural cracking usually takes place within 1 to 6 months after the concrete is poured. The initial crack width is more than 0.03 mm. The corners of the reinforced concrete panels after 1 year are often obvious. Oblique cracks or obvious transverse cracks in the center. Once cracking occurs, it is often affected by temperature changes, dry shrinkage, and swelling, and the cracks gradually expand. Coupled with factors such as uneven subsidence of foundations or earthquakes, the degree of cracking is more pronounced. Some engineering crack widths are more than 5 mm. Also a lot. Under the above circumstances, generally only 1-2 mm thick coating is difficult to pull, even if it is not pulled, because of the traction caused by thinning the coating can not be restored to its original shape, and become physically weak and overhead over the crack The thin surface, shaped like an extremely thin plank, is damaged by external forces. Once it is damaged, the rainwater will infiltrate into the entire crack, which is the root cause of building leakage.
4. Affected by the quality of the construction grassroots The current roof waterproofing project usually involves a layer of cement mortar screed. Because the waterproof material of the coating film adheres to the cement mortar, the cement mortar cracks, bulges (bubbles), and loses its waterproof function. Compared with coils, due to the thinner coating, it is more susceptible to the quality of cement mortar. This should be taken into account.
5. There is a gap between the actual elongation rate and the test data. A variety of polymer waterproof coatings are mostly characterized by high elongation and good crack resistance, but it should be pointed out that the elongation of the sample is the result of a certain thickness and certain temperature conditions. . Due to the change of brushing thickness and temperature during construction, both of them will directly affect the elongation rate, and are far from the sample data. Furthermore, the dry film after molding is often affected by changes in load, temperature, etc. The internal structure of the coating material changes, the time is longer, and its elongation rate is smaller.
6. The construction is susceptible to climatic factors and sub-construction. Before any film is formed, it is easy to run off in the event of rain erosion. If the construction surface is honeycombed or has voids, it is easy to retain moisture or solvents in the low-lying areas. This is an important reason for film bulging and peeling when it evaporates in the future. In addition, it suddenly encounters freezing damage or low temperature during brushing. At this time, the consistency of the coating and construction fluidity are both poor, and it is easy to cause air bubbles. , there is freeze phenomenon, not only affect the inherent properties of the material and the skin into a dry film, and residual solvent or moisture in the dry film later become the cause of film swelling or peeling.
The overall continuity of the coating is an important factor in determining the waterproof effect. A small area of ​​construction is easy to solve, but a large area of ​​construction, if you need to work on the construction of the upper and lower, or can be completed on a few days before, the effect is not the same. Due to the sub-construction, it is often the case that poor adhesion occurs between the dry film that is applied first and the dry film that is applied later, and the overall waterproof layer loses its effect due to this defect.
The reason for failure to form a complete continuous waterproof coating film, although most of them involve the performance of the material itself and construction process factors, is mainly related to the temperature of the conjunctiva. Because of the dry film formed at different temperatures, its ability to adapt to the expansion and contraction is slightly different, thus affecting the bond between the two.
Especially during the rainy season, due to the effect of rain, the dry film that has been painted on the construction surface has a temperature and moisture content that is significantly different from the surface of the unpainted concrete (cement mortar) because of the evaporation direction of water vapor. From the bottom up, this is in the subsequent construction site where there is a lot of water, and the coating film is prone to bulging and flaking.
7, paint production fisheyes, the construction of cutting corners due to low cost of waterproof construction projects, coupled with unfair market competition, so many materials manufacturers to produce a variety of models of the machine, the filling, fisheyes, greatly reducing the original material technology performance.
During the construction, because of uneven technology and uneven grass-roots level, the coating film thickness is difficult to detect. Therefore, the phenomenon of cutting corners often occurs. In this case, the quality of the waterproof construction of the coating film is difficult to guarantee, and the service life of the waterproof material is greatly shortened.
8. Conclusion Coating waterproofing is still a better waterproofing method at the current stage, but there are still many insurmountable disadvantages that should be taken seriously. At present, in addition to further improving the performance of coating materials, it is mainly to improve the construction quality of the grass-roots level, improve the waterproof structure and construction method of the coating film, and gradually find a high-quality, inexpensive and reliable coating film waterproof construction method.
Construction waterproofing quality control. Primary control points. The rigidity, smoothness, strength and surface slope of the main structure and the screed are accurate, and there is no sanding and peeling on the surface, and the moisture content of the base layer is the basis for guaranteeing the quality of the waterproof construction. Climatic conditions.
Paint cement glass craft glass
Standard:
ANSI B16.5,ANSI B16.47,ANSI B16.48, ANSI B16.36, MSS SP-44
EN1092-1 BS 4054 clients 'dwg
AWWA C207 Class D Ring
AWWA C207 Class D Blind
AWWA C207 Class D Hub
AWWA C207 Class E Ring
AWWA C207 Class E Blind
AWWA C207 Class E Hub
Size: 1/2''~60''
Class Rating: 150~2500
Facing: RF(raised face);FF(flat face);RTJ(ring type joint);RJ(ring joint face)
TG(tongue and groove face);MFM(male and female face)
Manufacturing process: forge,
Material:
Carbon steel:
ASTM A105;
ASTM A266 GR.1,GR.2,GR.3,GR.4
Stainless steel:
304/SUS304/UNS S30400/1.4301
304L/UNS S30403/1.4306;
304H/UNS S30409/1.4948;
309S/UNS S30908/1.4833
309H/UNS S30909;
310S/UNS S31008/1.4845;
310H/UNS S31009;
316/UNS S31600/1.4401;
316Ti/UNS S31635/1.4571;
316H/UNS S31609/1.4436;
316L/UNS S31603/1.4404;
316LN/UNS S31653;
317/UNS S31700;
317L/UNS S31703/1.4438;
321/UNS S32100/1.4541;
321H/UNS S32109;
347/UNS S34700/1.4550;
347H/UNS S34709/1.4912;
348/UNS S34800;
Alloy steel:
ASTM A694 F42/F46/F48/F50/F52/F56/F60/F65/F70;
ASTM A182 F5a/F5/F9/F11/F12/F22/F91;
ASTM A350 LF1/LF2/LF3;
Duplex steel:
ASTM A182 F51/S31803/1.4462;
ASTM A182 F53/S2507/S32750/1.4401;
ASTM A182 F55/S32760/1.4501/Zeron 100;
2205/F60/S32205;
ASTM A182 F44/S31254/254SMO/1.4547;
17-4PH/S17400/1.4542/SUS630/AISI630;
F904L/NO8904/1.4539;
725LN/310MoLN/S31050/1.4466
253MA/S30815/1.4835
Nickel alloy steel:
Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;
Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;
Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;
Alloy K-500/Monel K-500/NO5500/2.475;
Alloy 600/Inconel 600/NO6600/NS333/2.4816;
Alloy 601/Inconel 601/NO6001/2.4851;
Alloy 625/Inconel 625/NO6625/NS336/2.4856;
Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;
Alloy 800/Incoloy 800/NO8800/1.4876;
Alloy 800H/Incoloy 800H/NO8810/1.4958;
Alloy 800HT/Incoloy 800HT/NO8811/1.4959;
Alloy 825/Incoloy 825/NO8825/2.4858/NS142;
Alloy 925/Incoloy 925/NO9925;
Hastelloy C/Alloy C/NO6003/2.4869/NS333;
Alloy C-276/Hastelloy C-276/N10276/2.4819;
Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;
Alloy C-22/Hastelloy C-22/NO6022/2.4602;
Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;
Alloy B/Hastelloy B/NS321/N10001;
Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;
Alloy B-3/Hastelloy B-3/N10675/2.4600;
Alloy X/Hastelloy X/NO6002/2.4665;
Alloy G-30/Hastelloy G-30/NO6030/2.4603;
Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;
Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;
Alloy 31/NO8031/1.4562;
Alloy 901/NO9901/1.4898;
Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;
Inconel 783/UNS R30783;
NAS 254NM/NO8367;
Monel 30C
Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952
Nimonic 263/NO7263
Nimonic 90/UNS NO7090;
Incoloy 907/GH907;
Nitronic 60/Alloy 218/UNS S21800
The blind flange is also called the blind plate, which is called the flange cover. It is a flange without holes in the middle to seal the pipe plug. There are many kinds of sealing surfaces, such as plane, convex, concave convex, tenon groove surface and ring connection surface.
Blind Flange,Stainless Steel Flanges,Stainless Steel Blind Flange,Forged Blind Flange
HeBei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com