摘要
采用海水热雨循环90次、海水浸泡90d两种试验条件对比研究了四种混凝土抗压强度、扩散系数、电通量和钢筋腐蚀电位等性能的变化。结果表明,经热雨循环90次后试样抗压强度较海水浸泡90d的高,涂抹渗透结晶材料(CRM)对混凝土试样的强度影响不大;经热雨循环90次后试样扩散系数和电通量较28d的试样提高,海水浸泡90d后试样扩散系数和电通量均较28d的试样降低;C30混凝土扩散系数和电通量较C50的高,涂抹CRM会提高混凝土试样的扩散系数和电通量;经热雨循环90次后试样内钢筋腐蚀电位较28d试样降低,海水浸泡90d后试样内钢筋腐蚀电位较28d试样降低,但高于热雨循环90次的试样;C30混凝土试样钢筋腐蚀电位下降幅度较大,个别试样内钢筋发生点蚀,涂抹CRM的试样内钢筋腐蚀电位降低明显。涂抹CRM在海滨环境下会影响混凝土的耐久性。
Using heat and seawater shower cycles 90 times and seawater immersion 90 days,the compressive strength,diffusion coefficient,electric flux and corrosion potential of four concrete are comparatively studied.The results show that the compressive strength of samples by 90 times heat and seawater shower cycles is higher than samples by 90 days seawater immersion;adding of corrosion inhibitor has little effects on the strength of concrete;diffusion coefficient and electric flux of samples by 90 times heat and seawater shower cycles are higher than samples cured in standard condition for 28 days;diffusion coefficient and electric flux of samples by 90 days seawater immersion are both lower than samples cured in standard condition for 28 days;the diffusion coefficient and electric flux of C30 concrete are higher than the ones of C50 concrete;adding of corrosion inhibitor could increase the diffusion coefficient and electric flux of concrete;the corrosion potential of rebar of samples by 90 times heat and seawater shower cycles is lower than samples cured in standard condition for 28 days;the corrosion potential of rebar of samples by 90 days seawater immersion is also lower than samples cured in standard condition for 28 days,but higher than samples by 90 times heat and seawater shower cycles;the corrosion potential of rebar of C30 concrete decreases obviously,and the pitting could be found in the rebar of C30 concrete;the corrosion potential of rebar of concrete adding corrosion inhibitor decreases obviously,which would affect the durability of concrete under seashore environment.
出处
《混凝土与水泥制品》
北大核心
2012年第3期14-17,共4页
China Concrete and Cement Products
关键词
热雨试验箱
阻锈剂
耐久性
Heat and shower test box
Corrosion inhibitor
Durability
