不同侵蚀条件下水泥基材料碳硫硅钙石生成速度比较

Comparison of Thaumasite Sulfate Attack Formation Speed Under Different Erosion Conditions

摘要:

通过观察水泥净浆试件在电脉冲和常规浸泡条件下不同龄期的外观变化，并结合扫描电镜(SEM/EDS)、X射线衍射、红外光谱(FTIR)分析侵蚀产物的组成，对试件遭受硫酸盐侵蚀后碳硫硅钙石的生成速度进行了比较.结果表明：电脉冲明显加速了水泥基材料中碳硫硅钙石的生成速度.在电脉冲作用90～120天时试件内部有一个生成碳硫硅钙石的准备期，作用120天后侵蚀产物中出现大量的碳硫硅钙石；常规浸泡1年后，试件内部只检测到生成碳硫硅钙石所需的中间体，并无大量碳硫硅钙石生成.

关键词:水泥基材料; 电脉冲; 硫酸盐侵蚀; 碳硫硅钙石; 常规浸泡

Abstract:

A comparative study was made of the thaumasite formation speed of the specimen under the condition of electric pulse and the condition of common immersion. The erosion products generated by the two acceleration methods were analyzed by scanning electron microscope (SEM/EDS), X ray diffraction (XRD), and Fourier transform infrared spectroscope (FTIR) and appearance changes of the specimen were observed after different testing time. The results show that the electric pulse obviously accelerates the thaumasite formation of cementitious materials. There is a preparation period of the thaumasite sulfate attack(TSA) reaction in the specimen, when electric pulse act on it from the 90th day to the 120th day; abundant thaumasite is found in the erosion products after the 120thd. However, in the group of common immersion, there are some raw materials needed by the thaumasite formation in the specimen after the 1st year, and only a very small amount of thaumasite is found.

Key words:cement based material; electric pulse; thaumasite sulfate attack(TSA); thaumasite; common immersion