With the development of technology, the use of chemical products has gradually appeared in our production and life, helping us to increase the efficiency of production. How much does everyone know about the role of expansion agents? The scope of expansion agents is very wide, so it is very necessary for us to understand this knowledge. Only by fully understanding the relevant knowledge of the role of the expansive agent can we help us to use it better. Therefore, friends who don't know too much can quickly follow me with long knowledge!
Expansion agent effect
In addition to the expansion agent can increase the role of rubber elasticity and tension, there is the role of degumming. Love table tennis enthusiasts who like to use plastic glue, after a lot of glue injection will remain on the sponge thick paste, expansion agent for organic glue softening effect, when using expansion agent glue will become slimy At this time, you can use a bank card or ruler to scrape off the residue on the rubber. After using the expansion agent to achieve the glue filling effect, do not use the organic glue to paste the racket immediately. Otherwise, the result that the glue is all softened and cannot be bonded can be found.
Specific role
1: underground buildings: such as subways, underground parking, underground warehouses, tunnels, mines, civil air defense projects, pits, etc., mixing stations, etc.;
2: pools, swimming pools, water towers, storage tanks, large containers, granaries, oil tanks, caves and other warehouses;
3: high-strength highway pavement, bridge concrete surface, culverts, etc.;
4:Prefabricated components, anchorage of frame structure joints, pipe joints, grouting material of post-prefabricated prefabricated components, backfilling of back-seam joints, magmatic grouting material;
5: Cement products: self-stressing, prestressing and prestressed concrete pipes, slabs, columns, columns and columns, waterproof roof panels, etc.;
6: Non-shrinkage and infusion between the anchor bolts of machinery and equipment and the foundation of the machine;
7: cast iron pipe, steel pipe lined with protective mortar;
8: Self-waterproof rigid roof, mortar impervious layer, mortar moisture barrier, etc.;
9: stadium stands, urban sculptures, museums, hotels, etc.; construction of high-strength, high-impervious vertical shafts, dam backgroove filled with concrete.
Expansion agent application features
1: to achieve self-waterproof structure: cancel the external waterproof measures to improve economic efficiency 2/3;
2: Abandoning the long-lasting cast-in-place post-casting zone: The underground project is 60m long without post-pouring zone, exceeding 60M. The expansion zone is replaced with an expansion zone to reduce the cost and shorten the construction period;
3: Temperature difference crack control of large volume concrete: using the product, relax the temperature control index, generally do not need to use the cooling aggregate, buried in the concrete and other traditional construction methods, saving construction costs;
4: Cast-in-situ roof construction: The use of MPC and other products cast-in-place roof, with a simple structure, low cost, good waterproof durability, has been widely used.
Expansion agent formula
The expansion fiber anti-cracking and waterproofing agent is composed of sulphoaluminate micro-expansion agent, polypropylene fiber, water repellent agent, reinforcing agent and other functional materials. The product has the micro-expansion properties and the common advantages of the cracking fiber, and it also has The super-overlapping effect of high crack resistance and high impermeability is a composite material with perfect mechanism and excellent performance.
Expansion agent content
Now the general compensation shrinkage impermeability concrete, the expansion agent parameters are generally 6% -10%, the reinforcement belt parameters are generally about 12% -14%.
Expansion agent price
The market price of expansion agent is about 600-1300 yuan.
Note: This price is for reference only! Due to geographical differences, of course, the price will be different. For more details on the prices, please refer to the local distributors!
The correct use of swelling agent
The scientific and rational use of expansive agents has the following important factors:
1 Scientifically and reasonably selecting the amount of expansion agent, the use of expansion agent must be adapted to the corresponding concrete mixing plant. The purpose of fitting is mainly to determine the reasonable amount and method of incorporation according to the design expansion rate index. The method of incorporation is usually two methods of blending and partially replacing mineral admixtures.
2 Control the temperature of concrete pouring into the mold is generally reasonable in the range of 30±5°C.
3 Strengthen concrete vibrating, more dense than ordinary concrete vibrators.
4Scientific and reasonable maintenance methods, strengthening and maintenance 7 days before pouring, no less than 5 times of watering should be performed between 10:00 am and 4:00 pm, and each day of the 8th -14th day should be maintained every morning and afternoon. It is not advisable to carry out watering maintenance at night and it is not advisable to carry out excessive maintenance in the winter. The strict combination of temperature monitoring for conservation is very important, keeping in mind the principle of temperature control for “heating at the warming stage and warming at the cooling stageâ€.
5 It is not appropriate to use concrete with excessive mud content to produce concrete. It is not appropriate to load the concrete prematurely.
Expansion agent rapid inspection method
Beer bottle method: use expansion agent and cement, water reference a certain ratio of mixing, mixing evenly into a beer bottle, observe whether the beer bottle is cracked.
Beaker method: Take a part of the concrete mixed with expansion agent and put it into the glass sesame cake, vibrating and compacting. After the final coagulation of the concrete, add water to the cup and observe if the beaker breaks.
Phenolphthalein test method: The expansive agent is weakly alkaline, making phenolphthalein red.
Expansion agent use problem
1, the amount of expansion agent
Since the expansive agent itself is active, it can be regarded as a part of the cement, and therefore the amount of the expansive agent is calculated by replacing the cementitious material by an equal amount. In practical projects, different quantities of swelling agents should be scientifically and reasonably mixed according to different structural parts in order to meet the requirements for compensation. If the amount of the expansion agent is too much, it will not only increase the cost but also cause inconvenience to the construction. This is also a problem with the expansion agent.
2, limit the expansion rate problem
The limiting expansion rate ε2 of concrete is very important in engineering applications. It increases with the strength of the concrete, but the two are not directly proportional to each other. The value of ε2 is large, the self-stress value is high, and its ability to compensate for shrinkage and prevent cracking and seepage is strong. The value of ε2 is small, and its ability to prevent cracking and seepage is weak. Therefore, limiting the expansion rate ε2 is an important parameter for anti-cracking and impermeability of building structures.
3, to strengthen the mixing and improve the uniformity of expansion agent
The uniformity of the expansion agent is the basic condition for ensuring the crack-proof and crack-resistance of the compensation-shrinkage concrete, and the main measures for improving the uniformity of the concrete admixture expansion agent are:
1 Mix the concrete in strict accordance with the mixing system. The mixing time should be extended 30s than ordinary concrete to ensure that the expansion agent mixes well with cement and water-reducing agent to improve its homogeneity;
2 Concrete transportation and fabrics should be strictly in accordance with the construction regulations to prevent segregation.
4. Follow the selection principle of expanding agent
First, the expansion agent should be used correctly. When using concrete expansion agent, certain temperature and humidity must be ensured. The properties of ettringite can be kept stable. The use of concrete admixture expansion agent must strictly comply with national standards and be selected according to local conditions.
5, strengthen conservation
The expansion agent only mixes evenly with the cement, and the required expansion rate can be achieved by sufficient hydration. The expansion agent needs more water in the hydration process of cement. Practice shows that the mixing water alone is far from meeting the hydration requirements. Therefore, it is very important to strengthen the compensation and shrinkage of the water supply after pouring the concrete. The moisture-retention and maintenance of the compensation shrinkage concrete is very important. The period should be less than 14 days.
Editor's summary: In our lives nowadays, expansion agents are used very extensively and are very important in terms of construction. They are also indispensable materials. Expansion agents need to pay attention to many issues when we use them, such as the proportion of its use, whether it is mixed with the cement, etc. These need our attention.
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