What grouting material is used to reinforce road and bridge columns?

- High-strength non-shrinkage grouting material
This product is formulated with special cementitious materials, expansion agents, admixtures and specially selected high-strength aggregates. It has the characteristics of early strength, high strength, no shrinkage, micro-expansion, non-toxic, harmless, no aging, no pollution to water quality and surrounding environment, good self-tightness, and anti-rust. High-flow cement-based composite materials suitable for different grouting spacing requirements.
1. Product Features
Early strength, high strength: the daily compressive strength can reach - or above.
. High self-flowing property: it can fill all the gaps and meet the requirements of secondary grouting of the equipment.
Micro expansion: ensure close contact between the equipment and the foundation, and no shrinkage after secondary grouting. The bonding strength is high, and the holding force with round steel is no less than that of round steel.
Can be constructed in winter: outdoor construction is allowed at -℃ temperature.
. Strong durability: This product is an inorganic cementing material, and its service life is greater than that of the base concrete. After millions of fatigue tests, there is no significant change in the strength of the freeze-thaw cycle test. The strength is significantly improved after soaking in engine oil for 3 days.
2. Product use
Suitable for basic grouting of machine bases, anchor bolts and other equipment.
Reinforcement, repair and reinforcement of building beams, slabs, columns, foundations, floors and roads.
It can be used for anchoring anchor bolts and steel bars and structural reinforcement.
Embedding and fixing of construction joints using reverse driving method in subways, tunnels, underground and other projects.
, and secondary grouting for fixed connections between steel structures (rails, steel frames, steel columns, etc.) and foundations.
, Implementation standards
3. Technical parameters:
4. Construction steps
, Prepare disc mixer, grouting equipment, formwork and maintenance items, clean the grouting space and put the concrete in advance Surface wetting.
, set up the formwork and seal the joints of the formwork with cement (sand) slurry and plastic tape to ensure no water or slurry leakage.
It is recommended to use a disc mixer for mixing. Add water and mix according to the amount of water ~3. The mixing time is generally - minutes after the water-cement ratio is fully matched and all the powder and water are fully integrated. (It is strictly prohibited to use hand electric drill for mixing. device). When using manual mixing, you should first add /3 of the water and mix for 1 minute, then add the remaining water and mix until uniform.
Pour the evenly stirred grouting material into the grouting part from one direction. If necessary, bamboo strips or steel drills can be used to guide the flow, and the template can be properly vibrated or lightly tapped.
After the construction is completed, it should be covered with plastic film immediately and covered with straw curtains or quilts for 3 days of moist curing.
The operating temperature is -℃ to ℃. It is strictly prohibited to mix any additives or external additives into the grouting material.
5. Construction and maintenance:
Normal temperature maintenance
.. Before grouting, the daily average temperature should not be lower than ℃. After grouting, the exposed parts should be sprayed with curing agent or covered with plastic film in time, and added with Cover with a wet straw bag to keep it moist. When covered with plastic film, the exposed surface of the cement-based grouting material should be covered tightly to keep condensation water in the plastic film. If it is inconvenient to water the surface of the grouting material, a curing agent can be sprayed.
..The grouting material should be kept in a moist state, and the curing time should not be less than.
, High temperature maintenance
.. Take measures before grouting to prevent the grouting parts from being exposed to direct sunlight or other thermal radiation.
..Take appropriate cooling measures, and the temperature of the concrete foundation and equipment floor in contact with the cement-based grouting material shall not exceed 3℃.
.3. The temperature of the slurry entering the mold should not be greater than 3°C.
.. Moisturizing and maintenance measures should be taken promptly after grouting.
Winter maintenance
3. During winter construction, if the project does not have special requirements for strength growth, the exposed parts should be covered with plastic film and thermal insulation materials in time after grouting is completed. The initial curing temperature should not be lower than ℃. Do not water when curing under negative temperature conditions.
3. After the formwork is removed, if the difference between the surface temperature of the cement-based grouting material and the ambient temperature is greater than ℃, it should be covered and protected with insulation materials.
3.3. If the ambient temperature is lower than the minimum construction temperature required for cement-based grouting materials or when the strength growth needs to be accelerated, artificial heating maintenance can be used. The maintenance measures should comply with the relevant provisions of the current national standard "Construction Regulations for Winter Period of Construction Projects" .
6. Product dosage
tons~.tons
7. Packaging, storage and transportation
Packing specifications: /bag, store in a ventilated and dry place and prevent direct sunlight.
The shelf life is 3 months. If it exceeds the shelf life, it must be re-inspected before it can be used.
It does not contain benzene series, halogenated hydrocarbons, formaldehyde, heavy metals and other ingredients. It is non-toxic, odorless, non-polluting, non-flammable and non-explosive, and can be transported as general cargo.