混凝土养护效果电阻率评价法探索

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发布时间：2021-09-25

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混凝土养护效果电阻率评价法探索
李关利。，钱觉时王立霞。，徐姗姗。
(1．重庆大学材料科学与工程学院，重庆 400045；2．河南省建筑科学研究院有限公司，
河南郑州 450053；3．河南建筑职业技术学院，河南郑州 450007)
摘要：基于混凝土电阻率与含水率的关系，提出了一种定量评价混凝土养护效果的方法，即将设定
接触面积的铜片电极以不同深度埋入混凝土试件内部，用恒电位计测试不同养护条件下混凝土试
件内部电阻随深度的变化，根据计算出的混凝土内外层电阻率差值来判定养护的充分性．结果表
明：可建立一条充分养护和不良养护之间的定量分界线，即当内外电阻率差值 Ap<~10 kQ·cm 时
可判定混凝土得到了充分养护，当△p≥50 kQ ·cm 时则可判定混凝土养护不良．
关键词：混凝土；养护；电阻率；渗水性 ’
中图分类号：TU528．01 文献标志码：A doi：10．3969／j．issn．1007—9629．20l1．04．007
Electrical Resistance M easurem ent to Assess Curing Efficiency of Concrete
LI M ei—li1,2， Q N Yue—shi ， WANG Li—xia ， XU Shan—shan。
(1．College of M aterials Science and Engineering，Chongqing University，Chongqing 400045，China；
2．Henan Building Research Institute Co．，Ltd．，Zhengzhou 450053，China；
3．Henan Technical College of Construction，Zhengzhou 450007，China)
Abstract：A novel approach for making a quantitative assessm ent of how well concrete is cure． d is presen—
ted．The sm all copper electrodes with 0．3 m m thick were embedded horizontally in 5O m m within the sur—
face 10，20，30，40 and 50 mm of the specimens at the tim e of casting． The test was done to put concrete
specim ens to different curing conditions and examine the change in electrical resistance with depth on PS一6
potentiostat． The idea was that if a specim en was adequately cured，it would have a higher hum idity within
the near—surface layer concrete and show smaller difference in resistivity values at depths of 0—2 cm and
3-5 cm ，however，for the case of poor curing，the opposite would be true．Based on △p values at depths of
0-2 cm and 3-5 cm from the surface，a quantit． ative criterion between adequate and inadequate curing was
established，i．e△lD≤ 1 0 k0 ·cm was indicative of adequate curing and△lD≥50 kf2·cm was indicative of in—
adequate curing．The test procedure is quick and uncomplicated，and is found to be extremely sensitive to
test concrete curing efficiency．It can be developed into a new approach monitoring continually concrete CU—
ring efficiency in—site．
Key words：concrete；curing；electrical resistivity；water permeability
良好的养护可以使混凝土获得充分的潜在性
能，因此，合理充分的养护，尤其是早期的充分养护
是必需的．然而，混凝土施工过程中对养护并未给予
足够的重视，甚至经常被完全忽视．其主要原因是，
迄今为止，尚没有一种有效方法对混凝土的养护效
果进行定量评价以证实早期的不良养护，造成了后