基于数字图像处理的盐溶液过饱和比与结晶压力测量方法  

A Method for Measuring Supersaturation Ratio and Crystallization Pressure of Salt Solution Based on DIP Technology

作　　者：晏静 吴道勇 吴诗雨 YAN Jing;WU Daoyong;WU Shiyu(Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学喀斯特地质资源与环境教育部重点实验室,贵阳550025

出　　处：《硅酸盐通报》2023年第3期1081-1085,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(41761016);贵州省科技计划(黔科合基础-ZK[2022]重点018)。

摘　　要：溶液过饱和比和结晶压力是研究多孔材料结晶破坏效应的主要参数,但目前没有很好的手段直接测量溶液过饱和比。观察溶液结晶现象发现,溶液结晶前后图像灰度会发生明显变化,因此本文提出一种基于数字图像处理(DIP)技术的盐结晶过饱和比和结晶压力的测量方法。该方法以图像为基础,得出灰度值与溶液浓度的关系,运用MATLAB软件绘出溶液过饱和比和结晶压力分布图。以Na_(2)SO_(4)溶液和NaCl溶液的结晶行为为例,得到Na_(2)SO_(4)溶液与NaCl溶液结晶的初始过饱和比在1.1~1.3,进一步计算了Na_(2)SO_(4)和NaCl的结晶压力理论值。Na_(2)SO_(4)和NaCl结晶破坏效应的差异与二者不同的结晶行为有关,Na_(2)SO_(4)晶体的蠕变生长行为导致其更具破坏性。Solution supersaturation ratio and crystallization pressure are the main parameters to study the crystallization failure effect of porous materials,but there are no good means to measure solution supersaturation ratio directly at present.Observations on the phenomenon of solution crystallization show that the gray scale of the image changes obviously before and after the solution crystallization,therefore,a method for measuring the supersaturation ratio and crystallization pressure of salt crystallization based on digital image processing(DIP)technology was proposed.Based on the image,the relationship between gray value and solution concentration was obtained.MATLAB software was used to draw the distribution of solution supersaturation ratio and crystallization pressure.Taking the crystallization behavior of Na_(2)SO_(4) solution and NaCl solution as an example,the initial supersaturation ratios of Na_(2)SO_(4) solution and NaCl solution are obtained between 1.1~1.3,and the theoretical values of Na_(2)SO_(4) and NaCl crystallization pressure are calculated.The differences of the crystallization failure effect between Na_(2)SO_(4) and NaCl are related to their different crystallization behaviors.The creep growth behavior of Na_(2)SO_(4) crystals makes them more destructive.

关 键 词：盐溶液 过饱和比 结晶过程 结晶压力 数字图像处理 测量方法 

分 类 号：TU43[建筑科学—岩土工程]