These quality problems are prone to occur after concrete is poured:
1. The concrete surface is pitted
Phenomena: The concrete surface is partially rough due to lack of slurry or has many small pits.
Management method: The pitted surface mainly affects the appearance of the concrete, and the parts that are no longer decorated on the surface should be repaired. The pockmarked area should be rinsed with clean water, and then leveled with cement slurry or 1:2 cement mortar after being fully moistened.
3. Exposed bars
Phenomena: main bars, auxiliary bars and stirrups in reinforced concrete The tendons are not wrapped in concrete and are exposed.
Preventive measures: Before pouring concrete, check whether the position of the steel bars and the thickness of the protective layer are accurate, and repair any problems in time if they are found. In order to ensure the thickness of the concrete protective layer, attention should be paid to fixing the pads according to the spacing requirements. In order to prevent the steel bars from shifting, it is strictly forbidden for the vibrator rod to hit the steel bars. When the concrete falling height exceeds 2m, a stringer or launder should be used for unloading. The mold removal time must be correctly grasped based on the test results of the test block to prevent premature mold removal. Do not step on the steel bars during operation. If the steel bars are bent or tripped, they should be straightened and tied in time.
4. Improper use of concrete admixtures
Phenomena: After the concrete is poured, local or large Condensation cannot occur within the local area for a long time. The surface of the poured concrete structure is bulging, commonly known as surface "blooming".
Preventive measures
You should be familiar with the types and characteristics of admixtures, use them rationally, and Formulate usage management regulations. Admixtures of different types and uses should be stacked separately. Powdered admixtures should be kept dry to prevent moisture and clumping. The dosage of admixtures must be strictly measured according to the mix ratio requirements and used correctly.
Product characteristics:
1. Improve system viscosity: The aqueous solution of this product has good The viscosity and consistency used in concrete can make the concrete have good viscoelasticity, plasticity and toughness, and can effectively improve the cracks, hollowing, blistering, peeling and other phenomena that are prone to concrete.
2. Improve workability: This product can improve the fluidity of concrete mixtures under low water-cement ratio conditions while ensuring good cohesion. properties and stability, prevent bleeding and segregation, make the concrete structure more uniform, smoother during the pumping process, and less likely to cause blockage and other phenomena.
3. Improved constructability: This product has strong slump-preserving ability, and is highly adaptable to cement varieties, models and temperatures, and is almost not affected by external temperatures. Impact of change.
4. Good compatibility: This product is a high molecular biopolymer with strong acid and alkali resistance and does not react with other materials in the components. All commonly used additives including naphthalene, melamine and polycarboxylic acid admixtures are compatible.
5. Green and environmentally friendly: This product is polymerized from high molecular biopolymers and does not cause pollution to the natural environment during production and use. </p
微信扫一扫打赏
