中国铁道科学2018，Vol.39Issue(2)：1-9,9.DOI:10.3969/j.issn.1001-4632.2018.02.01
活性粉末混凝土在海水冻融作用下的耐久性
Durability of Reactive Powder Concrete under Action of Seawater Freeze-Thaw Cycle
摘要
Abstract
Seawater freeze-thaw cycle tests on reactive powder concrete with different mix proportions were carried out,and the variations of compressive strength and chloride ion permeation were studied.On this basis,service life prediction models were established based on freeze-thaw failure and chloride ion corrosion as control factors.Results show that the replacement of partial silica fume by fly ash and mineral powder reduces the 28 d compressive strength of reactive powder concrete,but improves the resistance to seawater free-thaw cycles.With freeze-thaw failure as the control factor for the service life of concrete materials and under the action of seawater freeze-thaw cycle,the service life of the reactive powder concrete mixed with fly ash or mineral powder is longer than that of reactive powder concrete with single silicon powder.The service lives of all reactive powder concrete samples with different mixture compositions are more than 90 a,while the service life of C50 high performance concrete is only 24.4 a.Based on random Monte Carlo simulations,followed by the analysis using the Weibull distribution,service life prediction models for concrete structure were established with chloride ion corrosion as control factor.The service life of the reactive powder concrete with different mix proportions was analyzed.Results show that the service life of reactive powder concrete can be significantly improved by increasing the thickness of protective layer.The service life can also be improved by replacing silica fume with fly ash and mineral powder.For fly ash,an optimum degree of cement replacement is found,whereas,for mineral powder,the service life of the concrete increases with its increasing addition.关键词
活性粉末混凝土/海水冻融循环/耐久性/氯离子侵蚀/抗压强度/寿命预测Key words
Reactive powder concrete/Seawater freeze-thaw cycle/Durability/Chloride ion corrosion/Compressive strength/Life prediction分类
交通工程引用本文复制引用
安明喆,王华,王月,韩松,黄瀚锋,余自若,季文玉..活性粉末混凝土在海水冻融作用下的耐久性[J].中国铁道科学,2018,39(2):1-9,9.基金项目
国家自然科学基金资助项目(51578049) （51578049）
