What are the factors that affect the flatness of graders?
The main causes of uneven slurry content are: water cement ratio is not strictly controlled; concrete mixing time is insufficient; mixing material composition is uneven; and concrete transport process segregation phenomenon. In bridge deck pavement construction, using half construction, concrete by truck and are often transported from the other half, the first concrete pavement after two coagulation disturbance, undermining the integrity of cement concrete bridge deck pavement, it is prone to cracking. 2. quality management and control institutions a perfect quality management and control mechanism is the key to improve the quality of construction. Construction units and supervision units must work closely together, always put quality in the first place, ensure strict control according to the standard in the construction process, and monitor the construction quality at any time.
The factors that affect the smoothness of bridge pavement 1. the mixing quality of concrete quality and concrete is one of the important factors that affect the smoothness of pavement. Concrete mix is not accurate, than the measurement of mixing quality does not meet the requirements and water content detection frequency on aggregate enough will affect the scene of the slump and workability of concrete, resulting in uneven density, resulting in poor planeness of bridge deck pavement. (1) if the mix proportion not allowed, aggregate fluctuated, the amount of sand or less time, will affect the concrete slump and workability, resulting in uneven density, resulting in uneven shrinkage of concrete. (2) the concrete slurry is uneven content as everyone knows, the fresh concrete under certain temperature conditions, capillary water, free water and continuous evaporation, concrete gradually began to shrink, the shrinkage phenomenon mainly occurred in the slurry, if this contraction is uniformly, so its surface roughness does not produce little effect or influence what if; fresh concrete water cement ratio of cement paste is too large, too much, and the water cement ratio and slurry mixture in distribution or mixing uneven, concrete shrinkage is also uneven, resulting in uneven pavement.
3. the performance of construction machinery, construction machinery and equipment are the hardware facilities to ensure the quality of the project, and it is an objective factor to improve the smoothness and comprehensive quality of the bridge deck pavement. In the construction of bridge deck pavement, the application of vibrating beam plays an important role in improving smoothness. 4., the construction team personnel quality, construction team is the direct builder of the project, and its quality consciousness, obey the management attitude is to improve the bridge pavement smoothness and comprehensive quality of the prerequisite. A skilled and experienced construction team is an important guarantee to improve the quality of construction.
