Experimental Study On The Durability Of Damaged Concrete Beams Strengthened With BFRP Under The Environment Of Acid And Ultraviolet Radiation

Active bridges and other large reinforced concrete structure in acid, ultravioletradiation and other corrosive environments, there have been varying degrees ofdamage, especially in an acid environment, Reinforced concrete structure willdecompose type corrosion, Makes concrete strength reduce, steel corrosion, resultingin the lack of capacity and durability, Makes the reinforced concrete structures withina reasonable lifetime can not play its due functions and need for reinforcement，Because basalt fiber cloth (BFRP) has excellent physical and chemical properties andexcellent engineering performance, It is suitable for seismic strengthening ofreinforced concrete structures such as the application. Research the durability ofBasalt Fiber Reinforced concrete structures in a variety of harsh environments isimportant, the results may provide a theoretical basis and technical support for bridgesand other reinforced concrete reinforcement, Based on this, This paper studies theBFRP reinforced concrete structures in an acid environment and UV durability.In this paper, the durability test about damaged beams which reinforced by BFRPunder the environment of acid and ultraviolet is carried out, Works as follows:First, in acid environment, those beams which were pasted0-4layers of basaltfiber fabric were placed in the acid solution, eroded60days, Then the static loadingtest is carried out.Second, Using a total of nine beams under the ultraviolet radiation environment,they are divided into three groups, each group paste1,2,3layers of basalt fiber cloth,the test beams with the same layers of basalt fiber cloth were placed in ultravioletenvironment for0,21,42days, Then the static loading test is carried out.Through experimental research conclusions reached as following aspects:（1）Paste basalt fiber cloth on the existing damaged beam has good reinforcingeffect，It can significantly improve the ultimate bearing capacity and flexural rigidityof reinforced concrete beams.(2）Acid environment has a greater impact on ultimate bearing capacity of thetest beam, Paste three layers of basalt fiber cloth has greatest impact. Compared to testbeams under water environment, the test beams ultimate bearing capacity decreasedby12.58%,4.4%respectively when they were placed in the acid environment for thePH is3,5. Ultimate bearing capacity of reinforced concrete beams decreased with thedecrease of PH value, and the more layers of basalt fiber cloth, the greater thereduction. (3）Acid environment and ultraviolet radiation has some influence on thedeflection of reinforcement beams. In acid environment, the deflection of test beamincrease with the PH reducing, The deflection increasing with the UV irradiation timeincreases.（4）Basalt fiber layers are the same, compared to the reinforcement beamswithout UV irradiation, after42days of ultraviolet radiation, the ultimate bearingcapacity of test beams decreased4.13%,7.97%,9.49%. Ultimate bearing capacity ofstrengthened beam is reduced with UV exposure time increasing. When the ultravioletirradiation time is same, the more layers of basalt fiber cloth, the greater the reductionof ultimate bearing capacity.