早期受冻对混凝土耐久性劣化的影响研究

在寒冷地区的混凝土建筑物常常因早期受冻导致耐久性的劣化，且劣化程度难以测定，故通过实验探究不同受冻温度和不同养护龄期对早期受冻混凝土耐久性劣化的影响。从受冻温度和养护龄期两个角度进行分组试验。通过测量质量损失率、动弹性模量和抗压强度来反映耐久性劣化程度。结果表明:养护龄期是混凝土耐久性的主要影响因素，终凝前受冻的混凝土耐久性劣化程度高于终凝后受冻的混凝土。受冻温度的影响较小，总体呈现温度越低劣化程度越高。建立了函数模型并用试验数据进行验证，证明相对动弹性模量与抗压强度损失率相关，可通过测量相对动弹性模量来推测抗压强度损失情况。相关研究可为寒冷地区混凝土建筑物更新维护与改造工程提供理论依据。

Analysis of Early Freezing Effects on the Deterioration of Concrete Durability

Concrete buildings in cold regions often suffer from the deterioration of durability due to early freezing,and the degree of deterioration is difficult to determine.Therefore,experiments are conducted to explore the effects of different freezing temperatures and different curing ages on the durability of early frozen concrete.Group tests are carried out from the perspectives of freezing temperature and curing age.Reflect the degree of durability degradation by measuring the mass loss rate,dynamic elastic modulus and compressive strength.The results show that the curing age is the main factor influencing the durability of concrete,and the deterioration of the durability of concrete frozen before final setting is higher than that of concrete frozen after final setting.The influence of freezing temperature is small,and the lower the temperature,the higher the degree of deterioration.A functional model is established and verified with experimental data,which proves that the relative dynamic elastic modulus is related to the compressive strength loss rate.The compressive strength loss can be inferred by measuring the relative dynamic elastic modulus.This research can provide a theoretical basis for the renovation,maintenance and reconstruction of concrete buildings in cold areas.