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中文摘要：
为了研究隧道衬砌混凝土抗硫酸盐侵蚀性能,针对隧道单层衬砌结构常用的喷射混凝土,考虑施工方式、钢纤维掺入等因素,对喷射混凝土硫酸盐侵蚀性能进行分析。采用干湿交替加速侵蚀法,分析普通混凝土与喷射混凝土抗硫酸盐侵蚀性能差异;随后,采用X射线衍射（XRD）、综合热分析（TG-DSC）和扫描电子显微镜（SEM）,对侵蚀后喷射混凝土产物的物相组成及微观形貌进行观察。研究结果表明：经硫酸盐侵蚀后,喷射混凝土基本性能损伤速度低于普通混凝土,而钢纤维喷射混凝土抗硫酸盐侵蚀性能最优;喷射混凝土硫酸盐侵蚀破坏方式从初期钙矾石破坏转变为后期钙矾石、石膏复合破坏;随着干湿交替次数增多,试件中钙矾石及石膏含量增加,氢氧化钙及水化硅酸钙含量降低。
英文摘要：
In order to investigate sulfate resistance performance of tunnel lining concrete,sulfate resistance test of shotcrete which was widely used in tunnel single layer lining structure,was carried out considering the influences of construction mode and steel fiber mixing.Using dry-wet alternation accelerated erosion method,the difference of sulfate resistance performance between ordinary concrete and shotcrete was analyzed.Afterwards,X-ray diffraction（XRD）,thermal analysis（TG-DSC）and field emission scanning electron microscope（FESEM）were adopted to observe the mineral composition and microscope of corrosion products of shotcrete after sulfate erosion.The results show that after sulfate attack,damage speed of shotcrete specimens basic performance is lower than that of ordinary concrete.Moreover,steel fiber reinforced shotcrete has the best sulfate resistance.The damage mode of shotcrete is ettringite destruction at the early period and later turns to ettringite-gypsum composite destruction.With the increase of dry-wet cycle,the dosages of ettringite and gypsum increase while,the amounts of portlandite and calcium silicate hydrated decrease.
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