1. The concrete with flowing sand and water mark defects has poor surface strength, weathering resistance and erosion resistance.At the same time, the water floating up in the concrete to leave a drainage channel, that is, a large number of development from the bottom to the top of the capillary channel network, these channels increase the permeability of concrete, salt solution and moisture and harmful substances easily into the concrete, the concrete surface damage.Bleeding increases the water-cement ratio on the concrete surface, and floating slurry appears, that is, the floating water contains a large number of cement particles, forming a slurry layer on the concrete surface, the strength is very low after hardening, and the wear resistance of concrete decreases.This is very harmful to the concrete which has the wear-resisting requirement such as the pavement.
2, the concrete water reducer bleeding will make the concrete coarse aggregate, steel bar around the formation of water capsules, with the gradual evaporation of water to form a gap, thus affecting the density of concrete, aggregate interface strength and concrete and steel binding force.The subsidence of concrete caused by water leakage leads to plastic cracks in concrete. The existence of plastic cracks will reduce the strength of cement.As a result of the overall settlement of the bleeding concrete, the mixing materials near the top move longer when the pouring depth is large, and the settlement is hindered. For example, when the steel bar is encountered and other obstacles, plastic settlement cracks are generated, from the surface down to the top of the steel bar.
Through the above introduction, we have learned the harm of the formation of concrete water reducer bleeding, so in order to reduce the occurrence of these hazards, once we found the water purifier bleeding phenomenon, it is necessary to timely control, so as not to cause harm.
