抗冲击防辐射重质混凝土耐久性研究

Durability of Impacting Resistance and Radiation Shielding Concrete

依据抗冲击防辐射混凝土基准配合比,通过混凝土抗冻、抗氯离子渗透、抗碳化试验,结合XRD、SEM等手段对其宏观和微观性能进行了综合测定研究。研究表明:无论是钢渣、钢锻单掺还是钢锻与碎石结合的防辐射混凝土,1)抗压强度及质量损失率均随着冻融次数的增加而增大,且钢渣抗冲击防辐射混凝土>钢锻碎石防辐射混凝土>钢锻防辐射混凝土;2)氯离子扩散系数都处于较低水平,钢锻抗冲击防辐射混凝土28d的氯离子扩散系数仅为1.76×10-12 m2/s;3)由SEM图中可以看出,混凝土结构中主要矿物成分为C-S-H、钙矾石(AFt)等,二次火山灰反应使得Ca(OH)2颗粒细化,纤维界面得到强化,混凝土结构更加密实。

In this paper, the macroscopic and microscopic properties were carried out with the help of anti-freeze tester detector, concrete carbonation, chloride ion permeability instrument,XRD,SEM on the base of impact resistant and radiation shielding concrete（IRRSC） proportion of benchmark. After the comprehensive measurement research,there were tow results obvious conclusions could be obtained：Whether it was which kind of concrete consisting of single steel slag or sin gle steel forging or steel forging-gravel being used as aggregate, 1）the loss rate of compressive strength and mass would increase with the number of freezing and thawing increasing, its order was： steel slag concrete 〉steel forging macadam con crete 〉steel forging concrete. 2）The chloride ion diffusion coefficient presented a good performance, and the chloride ion diffusion coefficient of steel forging concrete was just 1.76 × 10^12 m2/s for 28 d.3）From the SEM images,it could been seen that the cement stone structure , which mainly consisted of C-S-H,AFt, etc, got more compact with the secondary volcanic ash reaction making the Ca（OH）2 particles refinement that strengthened the fiber interface.