分别用普通硅酸盐(P·O)水泥和快硬硫铝酸盐(R·SAC)水泥作基体制备光纤导光混凝土,进行了抗硫酸盐侵蚀和抗碱溶液侵蚀试验,采用x射线衍射仪和环境扫描电镜,研究了不同品种水泥制备光纤导光混凝土的抗侵蚀性能和微观结构.结果表明:碱溶液养护对R·SAC水泥为基体的光纤导光混凝土的强度具有更为明显的破坏作用;R·SAC水泥为基体的光纤导光混凝土在碱溶液中养护后,其外观泛黄现象和腐蚀程度最为明显,且碱溶液对光纤导光混凝土的腐蚀程度远大于盐溶液;光纤导光混凝土在碱溶液中养护后,其光纤与基体间界面处结合不够紧密,出现较明显缝隙或微缺陷,可导致光纤导光混凝土力学性能下降;光纤导光混凝土水化产物中存在团絮状C—S—H凝胶、针棒状钙矾石、柱状石膏、六方薄板状羟钙石和球状铝胶,它们相互交织,结合比较致密.
Optical fiber light conductive concrete (OFLCC) was prepared with ordinary portland cement (P · O) or rapid-hardening sulphur alunfinate cement ( R · SAC) as matrix. Anti-erosion property and microstructure of OFLCC were investigated by sulfate attack resistance and alkali solution corrosion resistance tests, XRD and ESEM. Compared with the strength of OFLCC with P ·O curing in alkali solution, the strength of OFLCC with R · SAC is decreased more obviously. The appearance of yellowing phenomenon and the corrosion degree of OFLCC with R · SAC curing in alkali solution are the most obvious. The corrosion degree curing in alkali solution is greater than that curing in salt solution. After OFLCC curing in alkali solution, the interface bonding between optical fiber and cement matrix is not quite close together, and there appears obvious micro defects to decrease the mechanical properties of OFLCC. The hydration products of OFLCC are composed of group C -S -H gel, needle stick ettringite, columnar gyp- sum, six-party laminated hydroxyl calcium stone and spherical aluminium glue, and they are intertwined and combined densely.