NEWS CATEGORIES

Bridge rental Zhaoqing bridge sewing engineering vehicle rental service center

Data：2022/3/29 15:36:38

Project Rental Zhaoqing Bridge Jointing Engineering Vehicle Rental Service Center Xinyue Road and Bridge toll-free hotline 135-0000-3760, Ms. Fang, WeChat mobile phone with the same number, online all the year round, contact at any time. Among the types of concrete shrinkage, plastic shrinkage and shrinkage shrinkage are the main causes of concrete volume deformation. Cracks caused by corrosion of steel bars. Due to the poor quality of concrete or insufficient thickness of protective layer, the concrete protective layer is eroded and carbonized to the surface of steel bar, which reduces the alkalinity of concrete around steel bar, or because of chloride intervention, the chloride ion content around steel bar is high, which can lead to the destruction of oxide film on the surface of steel bar. Iron ions in steel bar react with oxygen and water invading into concrete, and the volume of iron oxide rust increases by about 2 times compared with the original, thus generating expansion stress on surrounding concrete, leading to cracking and peeling of protective layer concrete, cracks along the longitudinal direction of steel bar, and rust seeping into concrete. As a result of corrosion, the effective cross-sectional area of steel bars decreases, the binding force between steel bars and concrete weakens, and the structural bearing capacity decreases, which will induce other forms of cracks, aggravate the corrosion of steel bars and lead to structural damage. To prevent steel corrosion, the water cement ratio of concrete should be controlled during construction. Strengthen vibration to ensure the compactness of concrete and prevent oxygen from invading.

{Lankecms_eprev} {Lankecms_enext}