渗透结晶材料对混凝土耐久性的影响研究.pdf

2012年第3期
混凝土与水泥制品
2012No.3
3月
CHINA CONCRETE AND CEMENT PRODUCTS
March
渗透结晶材料对混凝土耐久性的影响研究
石正国,郭辉,彭鹏飞
(长江科学院工程质量检测中心,武汉430010)
摘要;采用海水热雨循环90次、海水漫泡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漫泡90d的高,涂抹渗逶结
晶材料(CRM)对混凝土试样的强度彩响不大;经热雨循环90次后试样扩散系数和电通量較28d的试样提高,海水
漫泡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置較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次后试样内钢筋腐做电位較28d试样降低,海水漫泡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饿,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。
关键词:热雨试验箱;阻锈荆;耐久性
Abstract: Using heat and seawater shower cycles 90 times and seawater immersion 90 days, the compressive strength
diffusion coef, electric flux and coros on po en al of four crete are comparatiely 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 sea
water immersion; adding of corrosion inhibitor has litle effects on the strength of concrete; diffusion coefficient and elec
tric 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 da s; the diffusion coefficient and electric flux of C30 concrete are higher than the ones
of C:50 concrete; adding of corrosion inhibitor could increase the diffusion coefficient and electric flux of concrete; the cor-
rosion 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 sam
ples 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 30 concrete decreases obviously, an the piting could be found in the rebar of C30 con
crete; the corrosion potential of rebar of concrete adding corrosion inhibitor decreases obviously, which would affect the
durability of concrete under seashore environment
Key words: Heat and shower test box; Corrosion inhibitor: Durability
中图分类号:TU528文献标识码:A文章编号:1000-4637(2012)03-14-04
0前言
境,与混凝土实际所处环境相似。将混凝土堆成长
海工混凝土的耐久性研究及其评估是当今国柱状,利用该系统开展试验来测试混凝土的耐久
际研究的热点课题。然而,当前研究混凝土的耐久性,将更加客观反应实际结构混凝土的耐久性和服
性和寿命预测大多数是荷载和单一盐溶液的简单役寿命。
复合作用下测试混凝土的损伤得到的,其中未考虑
渗透结晶材料(CRM)是一种新型的修补材料,
结构混凝土实际所处环境、气候和海水中多种离子可渗人混凝土内部结晶堵塞孔隙,从而达到抗渗和
的共同作用等影响,不能客观地反应实际结构混凝修补的目的。文章利用墙体耐侯性热雨试验箱,使
土的耐久性和服役寿命。墙体耐候性热雨系统试用海水对比研究渗透结晶材料对混凝土耐久性的
验箱可营造出温度、湿度和风力等因素变化的环影响。
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