摘要
舰船甲板用特种混凝土在服役过程中,会受到海水化学腐蚀与机械疲劳的双重影响,加速混凝土损伤,对此,为全面预警海洋腐蚀-疲劳耦合环境下混凝土的损伤状态,构建了舰船甲板用特种混凝土损伤预警模型。选择水泥、硅灰、粉煤灰、超塑化剂、钢纤维、河砂、海砂以及腐蚀抑制剂,制备2种舰船甲板特种混凝土样本T_(1)和T_(2);结合疲劳加载装置和盐雾干湿交替循环,模拟疲劳与海洋腐蚀环境并进行耦合试验,分析T_(1)和T_(2)的疲劳损伤情况;依据试验结果计算样本的疲劳损伤寿命,并完成损伤预警。测试结果显示:所提方法能够分析特种混凝土在海洋腐蚀-疲劳耦合环境下的状态,加入海砂的样本T_(1)的抗疲劳损伤能力优于加入河砂的样本T_(2);且在高盐雾环境中,T_(1)的疲劳寿命高于80万次,所提方法未触发损伤预警,而当T2的疲劳寿命低于80万次时,触发了“损伤预警”,该方法可以有效预警特征混凝土的状态,具备一定的实际应用性能。
Special concrete used for ship decks is subjected to dual effects during service:chemical corrosion from seawater and mechanical fatigue,which accelerate concrete damage.To comprehensively monitor the damage state of concrete under the coupled marine corrosion-fatigue environment,a damage warning model for special concrete used in ship decks was developed.Cement,silica fume,fly ash,superplasticizer,steel fibers,river sand,sea sand,and corrosion inhibitors were selected to prepare two types of special concrete samples for ship decks,T_(1) and T_(2).By integrating a fatigue loading device with salt spray dry-wet alternate cycles,the fatigue and marine corrosion environments were simulated,and coupled tests were conducted to analyze the fatigue damage of T_(1) and T_(2).Based on the test results,the fatigue damage life of the samples was calculated,and damage warnings were implemented.The test results show that the proposed method can effectively analyze the state of special concrete under the coupled marine corrosion-fatigue environment.The fatigue damage resistance of sample T_(1),which contains sea sand,is superior to that of sample T_(2),which contains river sand.In high salt spray environments,when the fatigue life of T_(1) exceeds 800,000 cycles,the proposed method does not trigger a damage warning;however,when the fatigue life of T_(2) falls below 800,000 cycles,a"damage warning"is triggered.This method can effectively monitor the state of the special concrete and demonstrates practical applicability.
作者
仇立松
潘爱琼
QIU Lisong;PAN Aiqiong(Zhengzhou University of Science and Technology,Zhengzhou 450000,China)
出处
《舰船科学技术》
北大核心
2025年第21期53-57,共5页
Ship Science and Technology
基金
河南省地区的河南省科技计划项目(212102210348)。
