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研究了矿粉水泥砂浆衬里在10%Na2SO4盐雾环境不同腐蚀时间后的宏观形态、微观形貌和腐蚀产物,考察了硫酸盐腐蚀过程中砂浆衬里强度变化、砂浆与球墨铸铁附着强度变化规律,从微观层面分析矿粉砂浆单一硫酸盐腐蚀机制。结果表明,矿粉水泥砂浆的水化强化时间较抗硫酸盐砂浆和硅酸盐砂浆滞后,在腐蚀过程中矿粉砂浆抗压强度、附着强度与抗硫酸盐砂浆相当,均高于硅酸盐砂浆。活性矿粉在腐蚀过程遇水先发生水化强化,延缓SO42-向砂浆体内渗透,推迟石膏和钙矾石形成。在水化反应后的界面硫酸盐被过滤在水化硬化的砂浆一侧,当硫酸盐达到一定条件形成棒状石膏堆积,造成砂浆体表面开裂。
The macroscopic morphology, microstructure and corrosion products of slag cement mortar lining in 10% Na2SO4 salt spray environment were studied. The changes of mortar lining strength and the adhesion strength between mortar and ductile iron were investigated. Analysis of Single Sulfate Corrosion Mechanism of Mineral Powder Mortar from Microscopic View. The results show that the hydration hardening time of slag cement mortar lags behind that of anti-sulfate mortar and silicate mortar. The compressive strength and adhesive strength of mineral mortar are similar to those of anti-sulfate mortar during the corrosion process, both of which are higher than that of silicate mortar. Active mineral water in the erosion process first hydration intensification, delay SO42-mortar penetration, postponed the formation of gypsum and ettringite. After the hydration reaction, the interface sulphate is filtered on the side of the hydration-hardening mortar. When the sulphate reaches certain conditions, the accumulation of rod-shaped gypsum causes the surface of the mortar to crack.