Concrete pouring and maintenance is a very important part of winter construction, which is directly related to the quality and safety of the project. This article will focus on the key points of concrete pouring and maintenance in winter construction to help readers better understand and master the relevant technologies.
1. Concrete pouring.
In the winter construction, the following points need to be paid attention to when pouring concrete:
1.Raw material selection.
Choose low-heat or medium-heat cement, such as slag cement or ordinary cement, to reduce the internal temperature of the concrete; Fly ash is added appropriately to reduce the amount of cement and reduce the heat of hydration; Choose a well-graded aggregate to reduce water and cement consumption, and reduce the temperature of concrete.
2.Mix design.
According to the design requirements and construction conditions, the mix ratio design is carried out. Appropriately increase admixtures, such as fly ash, finely ground slag, etc., to reduce the heat of hydration of concrete; At the same time, the water-cement ratio should be controlled to reduce shrinkage and cracking.
3.Construction method.
Layered pouring, secondary vibration and other construction methods are adopted to reduce the pores and cracks inside the concrete; Strengthen the support and fixation of steel bars to prevent cracks and deformation of concrete; Control the construction time and avoid pouring at night or in low temperatures.
4.Thermal insulation measures.
In the pouring process, take thermal insulation measures, such as covering the concrete surface with thermal insulation materials to reduce heat loss; At the same time, it is necessary to maintain the appropriate temperature and humidity to prevent the concrete from shrinking cracks.
2. Concrete curing.
In the winter construction, the following points need to be paid attention to in concrete curing:
1.Maintenance method.
According to the actual situation of the project and the construction conditions, choose the appropriate maintenance method. It can be maintained by heat storage method, heating method, negative temperature maintenance, etc.; At the same time, it is necessary to control the curing time and temperature to ensure that the concrete is fully hardened and the strength increases.
2.Selection of insulation materials.
Choose appropriate insulation materials, such as straw curtains, quilts, styrofoam, etc., to maintain the temperature and humidity of the concrete surface; At the same time, it is necessary to ensure the dryness and cleanliness of the insulation materials to prevent pollution to the concrete.
3.Temperature monitoring.
Strengthen temperature monitoring and timely grasp the temperature changes inside the concrete; At the same time, according to the temperature change, the corresponding maintenance measures should be taken to prevent early freezing damage to the concrete.
4.Protective measures.
During the curing period, take appropriate protective measures, such as brushing moisture-proof agents, covering waterproof cloths, etc., to prevent the concrete from being affected by water vapor and frost; At the same time, it is necessary to control the activities of construction personnel and the operation of machinery and equipment to prevent damage to the concrete in curing.
3. Quality control and safety management.
During winter construction, concrete pouring and curing requires strict compliance with relevant quality control and safety management regulations. The specific requirements are as follows:
1.Quality control.
In the process of pouring and curing, it is necessary to operate in accordance with the relevant specifications and technical requirements; At the same time, it is necessary to strengthen the quality inspection and acceptance work to ensure that the quality of concrete meets the design requirements.
2.Security management.
In the process of pouring and curing, the principle of safety first should be followed; At the same time, it is necessary to strengthen safety education and training to improve the safety awareness and skill level of construction personnel.