Concrete road and bridge damage GBS-S permeable waterproof anti-corrosion agent application-Iota

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Service > Concrete road and bridge damage GBS-S permeable waterproof anti-corrosion agent application

Concrete road and bridge damage GBS-S permeable waterproof anti-corrosion agent application

Now, with our infrastructure investment continued to increase in 2020 is expected to total mileage of 250 million kilometers, the highway to reach 100,000 kilometers or more, these projects use, durability, functionality increasingly being attention.
According to the US Corrosion Control Technical Committee (CCT) reported that from 1999 to 2001, the United States is building a direct impact on the corrosion and public transport infrastructure in the economy, an average of $ 143.5 billion per year, accounting for 1.6 per cent gross national product (GDP) of . Corrosion damage Britain 30 years accounted for an average of 3.5% GDP. Germany was $ 80 billion per year corrosion. Canada's infrastructure has been destroyed if all repair, then the cost to $ 500 billion. Corrosion loss of about 500 billion yuan, accounting for 6% GDP, in which 40% of construction corrosion (bridges, roads and buildings).
Concrete bridge damage is mainly due
Tianjin Municipal Research Institute of the Shandong Peninsula, Huanghua, Dagang, Tanggu, Hangu, Lutai, Jingtang Port, Caofeidian, Tangshan and Tianjin city along the coastal areas were a bridge durability research. In the survey found that the durability of harm far more than most people think. It is widely believed in the past, in terms of bridges for durability damage should be something after ten or twenty years, in fact, less than four years have been scarred local bridge, especially in some parts of the key nodes, it is often overlooked place. For example, leaking joints cause the beam to produce smooth muscle lid cracks, the concrete surface off a large area. Steel corrosion, the protective layer off a large area. Or saline coastal belt at the bridge piers are also more serious. Wherein the barrier wall and medians rot serious barrier wall in the worst bridge work environment, when the vehicle passes through the brine continuous sputtering, partial acid gas concentration, alternating wet and dry, freeze-thaw cycles and so on. Almost all anti-wall, 3-5 years, will occur rot.
In addition, car exhaust pollution and the environment against the wall of the bridge anti-corrosion and growing. Especially in large and medium cities vehicle intensive, criss-crossing the viaduct, soon after anti-wall paint landscaping in car exhaust, acid rain, salt damage effect, a new bridge in a very short period of time is etched automobile exhaust pollution beyond recognition.
Due to adverse weather conditions, winter road in northern China often snow, ice, conservation department in PAT in the process, the extensive use of de-icing salt, deicing salt. Currently, the main component of the application of deicing salt is salts include sodium chloride, calcium chloride, magnesium chloride, and some filling additives, damage to roads and road bridge construction significantly. Mainly waterproof concrete surface, permeability, lack of salt corrosion; secondly, concrete itself has a porous structure resulting in the ability to absorb water, but also through the freeze-thaw cycles and water stress effect on the concrete structure caused by persistent sabotage; Furthermore, de-icing salt, deicing chemical corrosive elements migrate to the concrete and penetration, and water together to produce salt and cold, salt corrosion, damage concrete concrete surface, and gradually to the concrete, resulting in a large an area of serious erosion. Studies have shown that aggressive environment in the outside world basically unchanged, the cumulative damage of concrete beginning approximately linear, then quickly develop approximately exponentially, rather than linear development, damage took place just a few years, the deterioration will soon enter accelerated phase, for 10 years was less than many highway bridge to severe corrosion disease, let alone a century life.
Therefore, prevent and eliminate such damage occurs radically and continues to spread has become essential. Construction of the expressway, good reinforced concrete structure, especially the bridge waterproofing and corrosion protection is the most effective measures to improve the durability of the bridge.
At home and abroad Common maintenance methods and products
Since the 1980s, silicon-based waterproof anti-corrosion coating technology is widely used in foreign countries to protect roads, seaports, garage, viaducts and other structures of concrete structures. This is the aspect of US Highway bridge protection of the most widely used, is currently the world's most advanced concrete protection technology. In response to these various environmental corrosion problems, the Ministry of the line made a series of design standards and anti-corrosion measures. China from the early 1990s, the introduction of foreign technology in the successful application of engineering and construction. And introduced around 2000 bridge concrete corrosion waterproof protection technology applied technology viaduct taken in Shanghai, Beijing, Anhui and other places of the good results. Currently, for example, from abroad and our self-developed enterprise DPS Wing condensate, 1500 waterproofing agent, silane waterproofing agent, TS waterproof preservatives have been more widely used.
The use of GBS series repair materials use and site performance
The author of Hebei Cangzhou area freeways, highways Hebei Qinhuangdao, the Beijing municipal bridge for field survey found that: bridge these areas there are different degrees of disease, particularly serious is the barrier wall. Different sections of the barrier wall corrosion depth of more than 2cm chisel part can be exposed to corrosion of steel.
Experiment according to the disease in these areas by Beijing Li high waterproof material Co., Ltd. Lide Bridge of GBS campaign materials.
First, the corrosive parts chipped away, revealing a solid foundation layer. Bare steel parts painted rust inhibitor. To reduce maintenance time, reduce road closures caused traffic jams and inconvenience. GBS-C concrete bridge using special repair material quickly repaired. The new material is a composite of cement hydration activator, ultra-fine high-strength fibers, curing enhancers, and other materials made of natural nano. Having early high strength, low shrinkage rate, temperature and type of cement adaptability, and the old concrete with strong, good compatibility features. Bonding concrete cracks, pitted surface, pit, repair damaged, bridge bearings, steel anchor, rapid plant buried steel and reinforced concrete structure and padded handle; particularly suitable for quick opening of the requirements of a large area concrete pavement, airport runway project. The flaw has been used extensively for high-speed railway and highway box beam surface repair, engineering construction site fast to use. Its strength can reach more than C50. The material is a survival barrier wall repair, curing times range from 10-5h free adjustment. Greatly shorten the construction and road closure period. The material before use, work surface ships to be repaired first wetting, and then depending on the material: water = 1: 0.15 ratio of column mixing with ordinary wipe board directly cast about 20 minutes to reach the initial strength.
To be empty after all, corrosion, exposed parts can be disposed of spray GBS-S-type bridge preservative penetration waterproofing agent. GBS-S waterproofing agent infiltration Bridge Preservation silicate compound is a polar material as the base material, addition of a catalyst, polymers, by mixing, the reaction of water resistance, impermeability, crystallinity, protection, corrosion resistance, aging resistance one of six rigid crystalline waterproofing materials. Non-toxic and odorless, nonflammable, is environmentally friendly waterproof material. And has superior water permeability. After spraying the concrete surface can rapidly penetrate the concrete, to promote the release of calcium ions and the occurrence of secondary chemical reaction with the free alkali and other chemicals to form a complete hydrophobic calcium silicate ion gel crystals. Fill the gap and capillary holes of the concrete with long-term effects of water; water as a carrier to prevent acid, alkali, salt, chloride and other media for concrete and steel Zhu internal erosion; improve concrete wind, anti-freeze, slowing base the ability to aggregate reaction. Greatly reducing the overhead concrete surface weathering, strength decreases and steel corrosion and other problems, but also eliminating the security risks due to the reflection caused by brushing paint; can be resolved northern winter because the road bridge of snow need a lot of salt water spray caused by concrete, steel corrosion the destruction and deterioration of ecological environment problems; also moisture, dust, prevent bacteria and mold to produce the concrete surface; improve the durability of the concrete surface, do not change and affect the concrete color, can effectively prevent the chloride ion in deicing salt, acid rain, automobile exhaust and other concrete surface corrosion. In particular, the waterproof material waterproof material because it is water-based, hydrophilic, spray can penetrate into the concrete base chemical reaction with silicone gel, covering pores Road in aqueous conditions occur. This layer of silicon gel by hydration into a sturdy, breathable, material glass needle structure all the pores filled with the concrete surface at the nip, the product will never become part of the concrete, not just surface coating, but the penetration into Internally, its use and concrete synchronization, This could be greatly extended service life of concrete. The main products are the current standard C / T902-2002, JC / T1018-2006, JC474-1999, DBJ01-54-2001 like.
Simple GBS-S-permeable bridge waterproofing preservative agent, should first clean up the use of the primary surface, requiring clean, dry and free from sand crisp phenomenon. Then directly sprayer spraying or manual brushing, spraying to spray evenly, not leak Tu. Spraying the second track or the third water repellent, do not wait again before completely dry before re-spray, spray penetration that will affect the results. As long as the surface is not out of water can be conducted with a brushing, spraying generally 2-3 Road.
Through on-site cutting and seepage experiments, the penetration depth of the material is mainly in particular have their own strength and marking concrete decisions. Concrete damage more serious, deeper penetration of the lower grade, higher grade deep penetration is relatively shallow. Generally penetration depth of 10mm or more, and the hydrophobic effect is very significant.
In conclusion
By Cangzhou, Qinhuangdao, Taiyuan, Beijing, Shanghai, and other places municipal bridges and highways proved, GBS-S-type bridge preservative penetration waterproofing agent technology is an economical and practical, viable, fundamentally prevent and eliminate concrete new approaches to large-scale erosion of the road, new technology. The material on the concrete to form a new protection system to meet the requirements for concrete repair of the bridge. The material can be selected according to different specifications of different project sites similar products, cost about 8-40 yuan / square meters, total cost is only half of imported materials, can save maintenance costs, greatly extend the life of the building. For these reasons, the promotion of the material will play an important role in the construction of municipal roads.

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