It is easy to make the concrete poor encapsulation, sand and stone separation, resulting in concrete pumping pipe blocking, construction site surface is not easy to finish, and hardened concrete is easy to produce upper and lower stratification, surface cracks and other problems.
1.2 Influence on concrete durability
Concrete bleeding will lead to the surface of the formation of floating slurry layer, when the floating slurry layer due to water loss thickening loss of liquidity, strength development is not enough to resist due to shrinkage or plastic shrinkage caused by tensile stress, concrete surface will produce many cracks. In the concrete interior, during the rising process of bleeding water, many bleeding channels with less cementing material are generated in the concrete interior, resulting in loose and weak concrete interior and easy carbonization, which increases the risk of steel corrosion in the concrete [1]. Water leakage leads to the formation of high water-cement ratio in the floating slurry layer, and the formation of empty, loose and weak surface after evaporation. The formation of slurry layer on the floor or road surface is easy to peel, which seriously affects the quality of concrete.
1.3 Influence on the appearance quality of concrete
Exudation tend to reduce the water cement ratio of concrete at the bottom, the uniformity of damage inside the concrete, the mixing water generated into the concrete surface will carry some gelled material and fine particles in the aggregate, to form a layer on the surface of concrete moisture large floating pulp layer, causing surface concrete loose more empty, honeycomb pitting surface, even dew stone. It has a great influence on the strength growth and carbonation rebound of concrete.
