毛细吸水作用对水泥砂浆电阻率的影响研究
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“十三五”国家重点研发计划(2016YFB0303603 4)


Influence of Capillary Water Absorption on Resistivity of Cement Mortar
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    摘要:

    采用四电极法测定了水泥砂浆电阻率随毛细吸水时间的变化,并分析了水灰比、聚合物乳液、引气剂对其变化的影响.研究表明:随毛细吸水时间的增加,水泥砂浆电阻率先缓慢降低,随后迅速下降,最后保持稳定;毛细吸水可使水泥砂浆电阻率降低70%以上,这可能与吸水后砂浆内部形成的孔隙导电通道有关;增大水灰比和掺入引气剂均可大幅度提高干燥条件下砂浆的电阻率,且对吸水状态下砂浆的电阻率也有一定提高作用,但对吸水后砂浆的电阻率影响不大;6%聚合物乳液掺量(聚合物的固含量占水泥质量的百分数)不仅可提高干燥条件下的砂浆电阻率,也可提高吸水后的砂浆电阻率(提高4倍左右,且保持在360Ω·m以上),原因可能与水灰比、聚合物乳液、引气剂对砂浆毛细孔隙结构的影响有关.

    Abstract:

    The influence of water cement ratio, polymer emulsion and air entraining agent on the change of cement mortar resistivity with capillary water absorption time was studied by four electrode method. The study shows that with the increase of capillary suction time, the resistivity of cement mortar is lowered down, then decreases rapidly, then remains stable; capillary suction can make the resistivity of cement mortar decrease by more than 70%, which may be related to the pore water after the mortar is formed inside the conductive channel; increasing the water cement ratio and mixing air entraining agent can greatly improve the resistivity of mortar under drying condition, and also have a certain effect on the resistivity of mortar under the condition of water absorption, but have little effect on the resistivity of mortar after water absorption, and the incorporation of 6% polymer emulsion can not only improve the resistivity of dry conditions, but also improve the resistivity of mortar after absorbing water(up to about 4 times, and higher than 360Ω·m), these may be related to the effect of the water cement ratio, polymer emulsion, air entraining agent on capillary pore structure of mortar.

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曾晓辉,凌晨博,潘璋,王平,李鲲鹏,罗信伟,崖尚松.毛细吸水作用对水泥砂浆电阻率的影响研究[J].建筑材料学报,2018,21(5):714-719

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  • 收稿日期:2017-10-31
  • 最后修改日期:2017-12-15
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  • 在线发布日期: 2018-10-31
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