不同盐类环境下普通混凝土的抗盐冻耐久性研究

大安市不仅是东北典型的季冻土区,也是吉林省土壤盐渍化最严重的地区之一.境内的土壤盐分含量高、组成复杂,主要有Na+、HCO3-、Cl-、SO2-4,还有少量的Mg2+、Ca2+、K+等.在盐类侵蚀与冻融循环等外界因素作用下,常引起混凝土的盐冻剥蚀破坏,造成结构性能劣化,严重影响各类建筑物的耐久性与安全性.为了探究盐类侵蚀与冻融循环双重因素作用下混凝土的耐久性能,进行了复合盐、单盐(碳酸氢盐、氯盐、硫酸盐)及水环境下普通混凝土的抗冻耐久性快速试验,总结在盐蚀—冻融双重因素作用下,普通混凝土的盐冻破坏规律,运用电镜扫描、能谱与化学成分分析,进一步研究普通混凝土盐冻的破坏机理.     

Analysis on forming conditions of deep marine reservoirs and their concentration belts in superimposed basins in China

By taking the Tarim Basin, Sichuan Basin and Ordos Basin as examples, the conditions for deep marine reservoir formation were illustrated in three aspects listed below： late-stage superimposition style, burial history and structural deformation of the marine stratigraphic system. The burial history of marine source rocks can be divided into three types, i.e., type I, type II and type III, which are obviously different from the case with present hydrocarbon phases in terms of hydrocarbon generation and pe- troleum-reservoir formation. Based on evolution history, the structural belts in the marine stratigraphic sequence can also be divided into four types, i.e. earlier normal fault-later fault-fold type, earlier uplift-later fault-fold type, earlier uplift-later flattened slope type, and earlier depression-later thrust type. In this paper, a successive gas generation model was proposed, and it was particularly pointed out that coupling of geothermal field annealing evolution and tectonic subsidence and late gas generation from dispersed liquid hydrocarbon in highly matured to over-matured source rocks are key factors for formation of marine petroleum reservoirs. The geological conditions for formation of high-grade reservoirs in deep marine system, covering early hydrocarbon injection, deep denudation and buried dolo- mitization, were summarized. It was finally concluded that three major structural belts, i.e. paleo-uplift belt characterized by composite hydrocarbon accumulation, paleo-fault belt and high-energy sedimentary facies belt, were involved in marine hydrocarbon accumulation.     

交流电流密度对X65钢在碳酸盐/碳酸氢盐溶液中腐蚀行为的影响

通过极化曲线测试、浸泡实验和表面分析技术研究了不同交流电流密度对X65钢在碳酸盐/碳酸氢盐溶液中腐蚀行为的影响.随交流电流密度的增加,钝化区宽度明显变窄,点蚀击破电位负移,维钝电流密度增大,腐蚀速率增加.在低交流电流密度下(<100A·m-2),维钝电流密度、点蚀程度和腐蚀速率均略增加;在高交流电流密度下(≥100A·m-2),维钝电流密度、点蚀程度和腐蚀速率均快速增加.     

密闭式软包装碳酸氢盐血液透析系统与透析液

血液透析是。肾功能衰竭的主要治疗方法。临床应用时常出现：透析液制剂临时配制，配制常不均匀，且易堵塞机器；透析液在开放状态下使用，CO2挥发，降低纠正酸中毒的疗效；用塑料罐装透析液，运输不方便，包装易损坏，温度高时胶桶膨胀，打开盖时CO2挥发。为此，我们采用碳酸氢盐固体制剂，进行配制工艺改革，配制出新型密闭式软包装碳酸氢盐血液透析液。