Concrete is an important part of building engineering and an important content of building raw materials. The following is my paper on concrete construction technology, I hope you can get some insights from it!

Concrete construction technology technical requirements for concrete construction

Concrete is an important part of building engineering, and it is also a basic factor to ensure building quality. Its construction technology is also a complicated process in building engineering. In this paper, the construction technology of concrete in building engineering is discussed.

Concrete is an important part of building engineering and an important content of building raw materials. According to relevant data, China's annual concrete consumption is about 654.38+0 billion cubic meters. For building engineering, the construction quality of concrete will directly affect the service quality after the building is completed. Because of this, we must fully and scientifically master the construction technology of concrete, so as to use concrete more effectively and better and play its due role. And then let it serve people.

1. Material requirements for concrete

1. 1 material mixture ratio requirements

Mix proportion is a key link before concrete is put into use. Only through relevant tests and accurate test data can the mix proportion suitable for specific construction projects be determined and the construction quality of concrete can be fundamentally guaranteed. Under normal circumstances, after determining the mix proportion of construction projects, concrete mix proportion with less cement consumption and small water-cement ratio should be selected as far as possible, which can effectively reduce the hydration heat of cement.

1.2 material admixture

Concrete cracking is a common phenomenon, but it will directly affect the quality of building structures. Choosing appropriate and reasonable admixture can effectively reduce the cracking of concrete. For example, adding a proper amount of fly ash into concrete can directly improve the drying shrinkage and brittleness of concrete, which not only reduces the possibility of concrete cracking, but also reduces the hydration heat reflection of concrete.

1.3 material aggregate configuration

Orthopedics refers to the stone and sand in concrete, and it is also an important part of concrete, so generally speaking, the requirements for aggregate are very strict, not only with high strength and good quality, but also with relatively stable physical and chemical properties, without any organic impurities. In general, the coarse aggregate in concrete should be natural continuously graded macadam, and the maximum particle size should not be greater than 1/4 of the minimum size of the structural section, and should not be greater than 3/4 of the minimum clear distance between steel bars. Fine aggregate should be medium-coarse sand.

1.4 cement requirements

Cracks in concrete are mainly caused by cement, because the temperature change of cement itself and the temperature change of surrounding environment will cause the hydration heat of cement, thus causing cracks. Because of this, in the process of concrete construction, we must attach importance to the quality of cement, such as insisting on using cement produced by regular manufacturers, minimizing the amount of cement, using low-heat cement and so on. Not only that, cement must be equipped with relevant quality certificates before entering the construction site, and the relevant staff of the construction project should also carry out testing before putting cement into use, and unqualified products will never be put into use.

2. Key points of concrete construction technology

In the process of concrete construction, we must pay attention to the following key measures: (1) Before construction, we should pay attention to the inspection of formwork and support, including the shape, size and elevation of formwork and support, such as the stability of support, the sealing of cracks and holes in formwork, and the embedded parts. , to ensure that the template will not shift or loosen when pouring concrete; 2) Attention should be paid to cleaning up the sundries in the formwork, and the wooden formwork should be watered first to do a good job of wetting, so as to prevent the concrete protective layer from loosening caused by more absorbent mud. Moreover, after absorbing water, the wooden formwork will expand, squeeze and compact, effectively avoiding slurry leakage; 3) Check the variety, quantity, specification, joint position and lap length of reinforcement. In addition, it is necessary to check the thickness of the steel protective layer and the specifications, quantity and position of the embedded parts to ensure the construction quality in essence. 4) The concrete slab must be vibrated with a flat vibrator, and the secondary vibrating and primary plastering processes should be carried out before the initial setting of concrete. The surface of slab concrete should be plastered after secondary vibration and twice before final setting, which can effectively reduce the micro-cracks on the slab surface.

3. Concrete construction process management

In the process of construction, relevant construction personnel should pay attention to the technical disclosure of workers, strictly control the phenomenon of trampling on steel bars, and the steel bar workers should promptly rectify the displacement, looseness, trampling on steel bars and protective layers. At the same time, it is necessary to strengthen the acceptance of reinforcement engineering to ensure that the thickness of concrete floor, concrete strength, reinforcement diameter, effective height of upper and lower reinforcement, anchorage length of reinforcement and thickness of lower reinforcement protective layer meet the design requirements. In addition, in the process of construction, as little as possible to leave construction joints, the thickness of the ground leveling layer should also meet the design requirements, not too thick. After pouring concrete, it should be leveled and polished at one time.

4. Maintenance requirements of concrete

The cast-in-place concrete slab shall be covered and maintained within 12h after pouring. If it can be covered with sacks and drenched with water to ensure humidity, the ordinary concrete shall be maintained for not less than 7d after pouring, and the concrete with retarder or impermeability requirements shall be maintained for not less than14d. Within 72 hours after the completion of concrete pouring, no trampling, formwork support and loading are allowed; When the concrete strength is less than 10MPa, no heavy objects shall be hoisted and stacked on the cast-in-place slab, and the impact on the cast-in-place concrete slab shall be reduced when the heavy objects are stacked. In addition, in the process of construction, the jacking load should be strictly controlled, and the temporary load during construction should not exceed the load limit specified in the design documents.

5. Conclusion

In a word, the progress of society and the development of the country have driven the growth of the construction industry, and concrete is an important part of construction engineering. Whether its quality is qualified or not will directly affect the quality of the whole construction project. Once there is a problem, it will threaten the safety of people's lives and property and seriously have a negative impact on society. It is precisely because of this that relevant construction enterprises and units must attach importance to mastering concrete construction technology, constantly sum up and analyze, improve their own capabilities, and thus promote the all-round development and progress of the construction industry.

refer to

[1] Huang Youguang. Construction Technology and Management of Concrete in Building Engineering [J]. China New Technology and New Products, 20 10( 19).

[2] Liu Shiqiang. Discussion on construction technology in mixed field of building engineering [J]. Building Materials and Decoration (Mid-term Journal), 2008(7).

[3] Ye Zhanlong. Technical analysis of mixed soil construction in building engineering [J]. Technology and market, 20 1 1(3).

[4] Feng Xueshu. Discussion on the application of clear water mixed soil construction technology in building engineering [J]. Management Li Lei, 20 1 1(5).

[5] __ Wei. Mao on concrete construction technology of Gaochang project [J]. Forum of Association for Science and Technology in 2009 (second half of the year) (1).

[6] Wang Shi, Jelena. Talking about the problems existing in the construction of building engineering and the management of construction technology [J]. Nakata Residential Facilities, 20 10( 12).

(Author: Heilongjiang Fujin 156 100, Fujin Antique Construction Company, Heilongjiang Province)

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