纳米偏高岭土砂浆氯离子渗透性的试验研究

发布时间：2018-01-04 14:49

本文关键词：纳米偏高岭土砂浆氯离子渗透性的试验研究　出处：《广西大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为研究不同水胶比(0.4、0.5、0.6)、养护方式(水养护、饱和Ca(OH)2溶液养护、水与饱和Ca(OH)2溶液交替养护)、矿物掺合料(矿粉、粉煤灰、凹凸棒粘土)对纳米偏高岭土砂浆氯离子渗透性的影响,采用正交试验设计9组纳米偏高岭土砂浆配合比,分析其对纳米偏高岭土砂浆物理性能(电阻率、孔隙率)、力学性能(抗折强度、抗压强度)、氯离子渗透性的影响规律;探讨纳米偏高岭土砂浆氯离子渗透性与其电阻率、孔隙率之间的关系。研究结果表明,水胶比是影响纳米偏高岭土砂浆电阻率、孔隙率的重要因素;矿物掺合料是影响纳米偏高岭土砂浆抗折强度、抗压强度、氯离子扩散系数的重要因素,掺30%粉煤灰、3%凹凸棒粘土时纳米偏高岭土砂浆氯离子扩散系数较掺30%矿粉的分别提高2.74倍、3.43倍;养护龄期为28 d时,纳米偏高岭土砂浆氯离子扩散系数与电阻率、气孔含量分别呈反比、正比关系。
[Abstract]:In order to study the effects of water binder ratio (0.4,0.5,0.6), conservation methods (water conservation, saturated Ca (OH) 2 solution of conservation, water and saturated Ca (OH) 2 solution alternating curing), mineral admixtures (slag, fly ash, nano attapulgite clay) of metakaolin mortar chloride ion permeability effect and by orthogonal design 9 groups of nano metakaolin cement mortar, the analysis on the physical properties of nano metakaolin mortar (resistivity, porosity), mechanical properties (flexural strength, compressive strength, chloride ion permeability) the influence of nano metakaolin mortar; chloride ion permeability and resistivity, the relationship between between the porosity. The results showed that water binder ratio is the effect of nano metakaolin mortar resistivity, an important factor of porosity; mineral admixture is the flexural strength, the effect of nano metakaolin compressive strength of mortar, the important factors of chloride diffusion coefficient, with 30% fly ash, 3 The chloride diffusivity of nano metakaolin mortar increased by 2.74 times and 3.43 times respectively compared with 30% mineral powder when the attapulgite clay was used. When the curing age was 28 d, the chloride diffusivity of the nano metakaolin soil mortar was inverse proportional to the resistivity and the porosity content.

【作者单位】：大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金资助项目(51578099) 中央高校基本科研业务费专项资金资助项目(3132014326)
【分类号】：U414
【正文快照】： 0引言为保证冬季道路交通安全运行,需喷洒大量除冰盐以除去道路、桥梁上的积雪。因目前国内外采用的除冰盐的成分主要是氯盐,这导致许多道路、桥梁结构处于氯盐环境中,而氯离子侵入混凝土会导致钢筋锈蚀,从而造成混凝土结构耐久性失效破坏。资料[1]显示,美国因大量使用冰除盐

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