摘要
用非稳态迁移法(NSSM)和自然浸泡法评定功能梯度混凝土(FGC)的抗氯离子渗透性能都存在局限性,但快速氯离子渗透试验法(RCPT)没有局限性。该研究用RCPT法对基于各种胶凝材料的FGC的电通量进行了大量测试并得到如下结论:提出了FGC的电通量计算公式;FGC的电通量反映了FGC的抗氯离子渗透性能,FGC的电通量越低则其抗氯离子渗透性能越高;碱激发矿渣(AAS)砂浆具有极好的抗氯离子渗透性能,其氯离子渗透系数可低至2.1×10^(–13)m^(2)/s。
[Objective]Functionally graded concrete(FGC)consists of several functional layers,each fulfilling a different role.Research has consistently shown that FGC outperforms single-layer concrete,leading to its increasing application in practical engineering.Testing methods such as the rapid chloride permeability test(RCPT)(given in ASTM C1202),non-steady-state migration test(given in Nordtest NT BUILD 492),bulk diffusion test(given in ASTM C1556 and Nordtest NT BUILD 443),and ponding test(given in ASTM C1543)are commonly used to assess chloride transport in single-layer concrete,only the RCPT is suitable for swiftly evaluating the chloride penetration resistance of FGC.In this study,we utilized the RCPT to measure the electric flux of FGC,examining the relationship between the chloride permeability resistance of FGC and the electric flux,as well as the relationship between the electric flux and the thicknesses of FGC’s functional layers.The results offer a reference method for rapidly determining the chloride penetration resistance of FGC.[Methods]Drawing from the calculation formula for the thermal conductivity of double-layer thin-walled composite materials,we employed a similar formula to calculate the electrical flux of FGC.We then conducted extensive experiments on the electrical fluxes of FGCs with different types of cementitious materials and varying thicknesses of functional layers.This allowed us to verify the feasibility of this formula in calculating the electrical flux of FGC.Concurrently,we analyzed the relationship between the electrical flux and chloride penetration resistance of FGCs.The electrical flux of FGC was measured using RCPT,while the chloride permeability resistance was determined by an immersion test.Concrete specimens were immersed in a 2%NaCl solution(mass ratio)for 180 days,after which the chloride permeability coefficient was measured.A rapid chloride ion analyzer was used to determine the chloride content at different positions within the concrete.[Results]The soaking test revealed th
作者
周万良
陈俊
高升
孙鑫梁
尚世豪
王淦
白江航
高鹏
赵卫平
ZHOU Wanliang;CHEN Jun;GAO Sheng;SUN Xinliang;SHANG Shihao;WANG Gan;BAI Jianghang;GAO Peng;ZHAO Weiping(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《实验技术与管理》
CAS
北大核心
2024年第4期32-38,共7页
Experimental Technology and Management
基金
国家自然科学基金面上项目(52372023)
合肥工业大学创新创业项目(X202210359247)。
关键词
功能梯度混凝土
快速氯离子渗透试验
电通量
氯离子渗透
碱激发矿渣
functionally graded concrete
rapid chloride penetration test
electric flux
chloride penetration
alkali-activated slag
