Abstract
Affected by various unfavorable factors during construction and operation,concrete panels of pumped storage power stationsin cold regions are prone to cracks, freeze-thaw erosion and other defects, which reduce the impermeabilityand durability of concrete panels. In order to effectively improve the impermeabilityand freezing resistancedurability of concrete panels, SK monocomponentpolyurea was selected for laboratory testsuch as tensile strength, freezing resistance, impermeabilityand xenon lamp weatheringaccording to the climatic conditions in northern cold regions and the operation characteristics of pumped storage power stations. Field protection tests were put into practiceon the reinforced concrete panels of the upper reservoir of Shisanling pumped storage power station, and 10 years of tracking tests were carried out. The experimental results show that SK monocomponent polyurea has good mechanical properties and long-term durability, which can play a positive role in improving the impermeabilityand anti-freezedurability of concrete panels. The protective effect is remarkable.
Highlights
In order to understand the protective effect of SK monocomponent polyurea on concrete freeze-thaw damage, laboratory freeze-thaw tests were conducted
As can be seen from Figure.5, when freeze-thaw is performed for 100 times, the concrete that is not coated with SK monocomponent polyurea has suffered more than 50% denudation damage, and the concrete that is coated with polyurea has not suffered denudation
It can adapt to frequent changes in water level of pumped storage power stations in cold regions and low temperature environment, and can resist deformation caused by concrete cracking at low temperature without leakage
Summary
SK monocomponent polyurea is a multifunctional monocomponent coating, which mainly contains multifunctional polymers such as silane groups, epoxy groups, urethane groups, ether groups and urea groups. It is composed of polymer prepolymer containing polyisocyanate-—NCO, blocked polyamine (including aminopolyether) and other functional additives.
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