纳米偏高岭土砂浆氯离子渗透性的试验研究  

Experimental study on chloride permeability of nano metakaolin mortar

作　　者：郭晓玉[1] 张世义[1] 范颖芳[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《广西大学学报（自然科学版）》2017年第4期1526-1534,共9页Journal of Guangxi University（Natural Science Edition）

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)

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。In order to study the influence of different water-cement ratio（ 0. 4,0. 5,0. 6）,curing conditions（ water curing,saturated Ca（ OH）2curing,water and saturated Ca（ OH）_2 alternate curing）,mineral admixtures（ GGBS,FA and ATT） on the chloride permeability of nano metakaolin mortar,an orthogonal test on 9 groups of nano metakaolin mortar mix was carried out. The physical properties（ resistivity,porosity）,mechanical properties（ flexural strength,compressive strength）and chloride permeability of the nano metakaolin mortars were analyzed, and the relationship between chloride permeability,resistivity and porosity of nano metakaolin mortar were discussed.The results show that the water-cement ratio is an important factor affecting the resistivity and porosity of the mortar,and that the mineral admixture is an important factor affecting the flexural strength,compressive strength and chloride diffusion coefficient of the mortar. Comparing to the mortar with 30% GGBS additive,the chloride diffusion coefficients of the mortar with 30% FA and3% ATTadditive were increased by 2. 74 and 3. 43 times,respectively. The relationship between the chloride diffusion coefficient,resistivity and porosity of the nano metakaolin mortar were inversely proportional and proportional,respectively.

关 键 词：纳米偏高岭土砂浆 正交试验 电阻率 孔隙率 氯离子扩散系数 

分 类 号：TU528.58[建筑科学—建筑技术科学]