Cement protective fences are an important part of railway safety, but cracks often occur during the manufacturing process, which not only affects their aesthetics, but also may affect their safety. Therefore, when making railway cement protective fences, the following points need to be paid attention to to reduce the appearance of cracks.
First of all, the rational selection of raw materials is the key. The quality of raw materials such as cement, aggregates and admixtures must meet the relevant standards, and at the same time ensure that the ratio of raw materials is reasonable. When choosing cement, we should first choose low-hydration heat cement, and control the fineness and storage time of cement to ensure its stable quality. The selection of aggregate is also crucial, and it is necessary to select high-quality aggregate and control the particle size and mud content of the aggregate to improve the compactness and crack resistance of the concrete.
Secondly, strengthening the mixing and transportation control of concrete is also a key measure to reduce cracks. In the mixing process, the amount of water added and the mixing time should be strictly controlled to ensure that the concrete is mixed evenly and there is no dry and hard phenomenon. In the process of transportation, it is necessary to avoid the segregation and initial setting of concrete, and ensure that the slump and fluidity of concrete meet the requirements.
Third, pay attention to construction methods and maintenance conditions. In the construction process, it is necessary to control the vibration and plastering time of concrete to avoid over-vibration and leakage. After the concrete pouring is completed, it is necessary to carry out timely maintenance to maintain the appropriate temperature and humidity to prevent the concrete from drying and shrinking cracks. Especially during winter construction, it is necessary to pay attention to taking thermal insulation measures to prevent the concrete from freezing.
Then, strengthening quality inspection and monitoring is also one of the important measures to reduce cracks. During the construction process, the slump and air content of the concrete should be tested regularly, and the problems should be found in time and measures should be taken to correct them. After the pouring is completed, a comprehensive inspection of the concrete surface should be carried out to find and deal with the crack problem in time.
To sum up, to reduce the occurrence of cracks in railway cement protective fences, it is necessary to start from the aspects of raw material selection, mixing and transportation control, construction methods and maintenance conditions, quality inspection and monitoring. Only by strictly controlling all links can we make high-quality, high-performance railway cement protective fences and provide a strong guarantee for railway safety.