The Study On Concrete Relevant Technology Of Cold Water Cooling Tower In Cold Areas

Seawater circulating cooling technology can be widely used in coastal power, metallurgyand other fields, which can save valuable fresh water resource, be beneficial to environmentprotection and have superior economic performance. But reinforced concrete structures arestanding acid tests such as gas permeability environment of very high temperature, moistureand high chloride ion content and concentrated seawater environment. The conventionaldesign based on bearing capacity limit states as well as normal deformation and the crackchecking cannot meet the requirements. The durability of material and structure must beconsidered during design and construction.Combined with domestic and international experience in the application and thedurability relevant research of the concrete structure, this paper puts forward concretedurability design parameters and raw materials control standards based on the sufficientresearch and prepares high performance concrete with greater proportion of mineraladmixtures from42.5ordinary portland cement, fly ash, slag, polycarboxylatesuperplasticizer according to the using environmental features of different concrete structureparts. Through preparation of series mineral admixture mixed concrete, the optimal schemeof different parts of the concrete are determined based on the concrete physical, mechanicaland durability experimental study.The test results showed that the twenty eight day carbonation depth of C40,C45and C50concrete was less than the fifty year carbonation depth in general atmospheric environmentand far less than the thickness of concrete cover,so that concrete carbonation resistance ofdifferent parts are good. The compactness and anti-chloride ion penetration ability ofconcrete with different cementitious material system is improved along with increase ofcementitious material consumption. The sixty day contractibility rate of C40-C50highperformance concrete comprised of polycarboxylate super plasticizer, fly ash and slag isless than0.035%, compared to0.06%more of twenty eight day contractibility rate ofordinary concrete.The dynamic elastic modulus and mass loss rate of C40, C45andC50concrete changes little after400cycles of freezing and thawing action as a result ofimproved compactness so that the frost resistance of concrete can meet the usingrequirements of F400.