Talking about the construction materials used for the road and Bridge caulking sealant has been widely used in the project, because the sealant can improve the driving comfort and safety, improve the overall waterproof effect of the road. In the early stage of our country, the main use was hot-melt or normal temperature caulking asphalt or tar paste. Because of the increase of the concrete plate, the deformation of the road and bridge joints also increased, so higher requirements were put forward for the sealing materials. With the development of sealant industry, polymer sealant was used in 1990s, mainly polyurethane and polysulfide sealant, and silicone sealant was also used in recent years. In the 1970s, polymer sealant was used for road and bridge joints in foreign countries. The main products are polyurethane, polysulfide and silicone sealant. Polyurethane and polysulfide sealant are usually multi-component products, silicone sealant is usually single component products. Polyurethane and polysulfide sealant are relatively low in price, while silicone sealant is relatively high in price, so polyurethane sealant is the most widely used in China, followed by polysulfide sealant. As the sealant for road and bridge, the base course is mainly cement concrete, with porous surface and low strength, so the sealant with high modulus cannot be used; at the same time, due to the increase of road and bridge plates, the joint deformation increases, and the deformation displacement capacity of sealant is required to be larger, usually up to ± 20%, ± 25%. At present, the displacement capacity of some road and Bridge sealants is even up to ± 50%, Or + 100% ~ - 50%.
At present, the main problems of the road and Bridge caulking materials are that the displacement ability can not meet the requirements, the high modulus of sealant causes the damage of the bonding interface, the large volume shrinkage of sealant causes the joint jumping, the poor durability and elastic loss of sealant. These problems are mainly related to construction and material performance. Firstly, the sealant must be elastic sealant to ensure that it can keep its original shape with the joint deformation; at the same time, the modulus of sealant cannot be high, because the bond strength of the concrete joint interface is unlikely to be high, and the high modulus sealant is prone to interface damage; at the same time, the strength and surface state of the concrete interface also affect the bond. In order to ensure the bond, the primer is usually used Treatment, enhance the adhesive between sealant and base material. R930 road and Bridge sealant R930 can be divided into R930 and r930l according to the density of the sealant. R930 is non sagging type, r930l is self leveling type, all of which are single component neutral curing. The modified silane sealant specially designed for the long-term weather proof sealing of expansion joints, contraction joints and longitudinal joints of airport runway, expressway, high-speed railway, tunnel, bridge and other concrete or asphalt pavement has the characteristics of low modulus high displacement, no need for primer, compatible with concrete chemistry, and suitable for the displacement of concrete joints. R930 road and Bridge caulking sealant, compared with two-component polyurethane sealant, single component packaging and construction is more convenient, multi-directional performance is more excellent, modified silane material compared with conventional silicone sealant has the characteristics of non oil evolution, environmental protection, pollution-free, good durability, etc., the construction is fully suitable for the use of road and Bridge sealing engineering.
Technical parameter table? Application scope
Used for joint sealing of airport, expressway and high-speed railway
Sealing of joints and grouting joints for other concrete pavements
Used for sealing of subway, tunnel, bridge and other projects
It is used for water conservancy project and reservoir dam caulking;
Roof joint waterproofing for industrial and civil buildings
Product advantage
? single component packaging, easy to use, good extrudability within the normal construction temperature range;
? no primer is required, it is chemically compatible with the concrete, and the chemical bonding to the concrete is firm;
? excellent aging resistance, not damaged by sunlight, rain, snow, ultraviolet and ozone; excellent high and low temperature resistance, excellent performance of cured adhesive strip at - 40 ℃ ~ 120 ℃;
? high displacement capacity: with the expansion and shear deformation of concrete joints, the colloid itself will not be damaged;
? low modulus: low stress generated during passive deformation to ensure that the concrete surface is not damaged;
? high elastic recovery ability: it can follow the joint movement repeatedly, with fast response, fast recovery and small deformation.
Curing mechanism
Ruilangda road and Bridge caulking sealant is cured by hydrolysis and dealcoholization of silane and moisture in the air and then condensation. It belongs to moisture absorption curing adhesive. Once the colloid is unsealed, it absorbs the moisture in the air, solidifies gradually from the surface to the deep layer, and becomes an elastomer. The higher the temperature and humidity is, the faster the curing will be; the slower the curing will be in low temperature and low humidity environment.
Chemical resistant medium
The products can be resistant to fresh water, sewage, waste water, calcium carbonate solution, detergent, low-grade acid, corrosive solution, mineral oil, vegetable oil, fat, fuel, organic solvent, paint thinner, etc. for a long time.
construction technology
1. Cutting construction joint: use cutter to cut construction joint according to specification, use blower, brush, blade and other tools to remove dust and sundries in the joint, and fully dry it; brush primer to improve bonding strength.
2. Laying padding material: laying polyethylene foam strip slightly larger than the slot in the seam, and the depth is above 8mm. 3. Application and filling of glue: install self leveling glue into the joint filling equipment, put the rubber hose into the bottom of the joint, and inject the caulking glue into the joint; put the paste glue into the glue gun, and the glue nozzle into the joint, and then apply the glue and level it. 4. Reserved space: because the gap will expand and contract, the surface of the joint sealant after construction shall be about 2mm lower than the road surface. 5. Maintain for at least 5 hours after construction, and the period of fault sticking.
Matters needing attention
? avoid construction under 5 ℃ and humidity less than 20%.
? avoid contact with eyes and skin. In case of contact, please wash with clear water and see a doctor if necessary. ? in order to keep the construction surface clean and beautiful, protective tape and masking paper shall be pasted on both sides of the construction surface. ? the thickness of joint sealant shall be within 6-13mm, and the width thickness ratio of joint sealant shall be about 2:1. ? maintain for 24 hours after construction to avoid contact with rainwater, chemicals and other substances.
Packaging specification
R930 adopts aluminum film: 600ml / piece, 20 pieces / box
R930l adopts plastic barrel: 25kg / barrel
Storage mode
The product must be stored in a low temperature (below 27 ℃) dry environment (less than 20% relative humidity), with a shelf life of 6 months.
Safety and health
? do not contact the uncured sealant product with food and cosmetics;
? the uncured sealant shall not contact the skin for a long time;? If the sealant enters the eyes carelessly, it must be rinsed with a large amount of water immediately and then checked by a doctor;? Place the product in a place that can not be touched by children.
Henan ruilangda New Material Co., Ltd. is invested and built by Zhengzhou Huayu Technology Co., Ltd. It is a high-tech enterprise specializing in the research, development, production and sales of adhesives.
The company continues to meet the needs of customers with high-quality products, reasonable prices, fast and thoughtful services, and common development with customers!
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