- 陳 波1,白 銀1,劉雪娟2,張文瀟1,寧逢偉1
2015年第8期
摘要
引用本文
摘 要:為了確定同時受硫酸鹽強腐蝕作用和氯離子強腐蝕作用的鉆孔灌注樁混凝土的水泥品種,考察了普通硅酸鹽水泥、高抗硫水泥及Ⅱ型硅酸鹽水泥對鉆孔灌注樁混凝土的耐久性影響。分別研究了評價抗硫酸鹽侵蝕性能的抗壓強度耐蝕系數、砂漿膨脹系數和砂漿抗折強度抗蝕系數,以及評價抗氯離子侵蝕性能的氯離子遷移系數、氯離子擴散系數和電通量。結果表明,與采用普通硅酸鹽水泥相比,采用高抗硫水泥與Ⅱ型硅酸水泥的混凝土抗硫酸鹽侵蝕性能沒有明顯提高;普硅水泥混凝土的抗氯離子侵蝕性能要優于高抗硫水泥混凝土和Ⅱ型硅酸鹽水泥混凝土。在硫酸鹽與氯離子雙重強腐蝕作用下,普硅水泥制備的高性能鉆孔灌注樁混凝土具有良好的耐久性。
Abstract: In order to determine cement types for bored pile concretes which are suffered from strong sulfate attcak and serious chloride corrosion, the effects of cement types on bored pile concretes durability are investigated. Three ordinary Portland cements, one sulfate resistance Portland cement and one type Ⅱ Portland cement are selected. Sulfate attack resistance properties, i.e. concrete compressive strength corrosion coefficient, mortar expansion coefficient and mortar flexural strength corrosion coefficient, chloride corrosion resistance properties, i.e. chloride migration coefficient, chloride diffusion coefficient and electric flux, are tested respectively. The results show that concrete with sulfate resistance Portland cement and type Ⅱ Portland cement have no significant improvement on sulfate attcak resistance when compared with ordinary Portland cement. On the other hand, concrete with ordinary Portland cement remarkably improve the chloride resisting property than the concretes with the other two types of cement. With coupling effect of sulfate attack and chloride corrosion, high performance bored pile concrete with ordinary Portland cement has more excellent durability.