CAJ | 학술논문

利用MIP压汞仪对碳化反应前后不同荷载应力水平和不同试件形状的孔结构信息进行定量研究，利用分形理论中的热力学分形模型计算出各组试样的孔表面积分形维数，分形维数越大表示孔结构的曲折和复杂程度越大，有害侵蚀性介质传输难度增加。研究结果表明：利用分形理论中的热力学分形模型可以定量地表述孔结构的变化，其数值结果在拓扑维数2.0和2.7之间。荷载影响下砂浆试样的孔表面积分形维数的分维值在2.1~2.5之间；对应力水平为0.2的试样，拉应力作用下其孔表面积分形维数的分维值比压应力作用下的大；对应力水平为0.4，0.6的试样，其拉应力作用下的分维值比压应力作用下的小。不同形状的水泥基试样其孔表面积分形维数在2.0~2.7之间，碳化前后其分维值都减小，但是块状试件的分维值减小的幅度比圆柱状试件要大。
이용MIP압홍의대탄화반응전후불동하재응력수평화불동시건형상적공결구신식진행정량연구，이용분형이론중적열역학분형모형계산출각조시양적공표면적분형유수，분형유수월대표시공결구적곡절화복잡정도월대，유해침식성개질전수난도증가。연구결과표명：이용분형이론중적열역학분형모형가이정량지표술공결구적변화，기수치결과재탁복유수2.0화2.7지간。하재영향하사장시양적공표면적분형유수적분유치재2.1~2.5지간；대응력수평위0.2적시양，랍응력작용하기공표면적분형유수적분유치비압응력작용하적대；대응력수평위0.4，0.6적시양，기랍응력작용하적분유치비압응력작용하적소。불동형상적수니기시양기공표면적분형유수재2.0~2.7지간，탄화전후기분유치도감소，단시괴상시건적분유치감소적폭도비원주상시건요대。
With MIP mercury intrusion microscopic test,a quantitative study was conducted on the pore structure with different load stress level and specimen shape before and after carbonation. The fractal dimension is larger ,means the tortuous and complex degree of pore structure are more,and harmful erosion medium is more difficulty. Based on thermodynamic fractal model ,the change of the external fractal dimension was analyzed before and after carbonation. The study reveals that the fractal dimension of thermodynamic fractal model can characterize the changes of the samples pore structures. The numerical result is between 2.0 and 2.7. Pore external fractal dimension of mortar specimen is between 2.1 and 2.5 under load. Sample,whose stress level is 0.2,the external fractal dimension under the action of tensile stress is larger than that under the action of compressive stress. However,sample,whose stress level is 0.4 and 0.6,the conclusion is opposite. On the other hand,pore external fractal dimension of cement-based specimen is between 2.0 and 2.7 for different shapes samples. Their fractal dimension values were decreased before and after carbonization ,but the fractal dimension values of massive specimens de-crease amplitude is bigger than cylindrical specimens.