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硫酸盐侵蚀破坏是引起混凝土耐久性失效的重要原因之一,海洋环境混凝土很容易被海水中的硫酸盐侵蚀破坏,使混凝土结构遭受侵蚀,使用年限大大缩短。所开发的一种混凝土用抗硫酸盐防腐剂组成成分由密实组分、膨胀组分和激发组分组成。为了研究这种新型防腐剂的防腐蚀机理,利用XRD和SEM等微观试验方法研究防腐剂各组分和水泥水化结构的变化以及超细矿粉的掺入对水泥水化的影响,并通过以C-S-H凝胶和AFt为主的水化产物量变化分析新型防腐剂的显微防腐机理。显微分析结果表明密实组分可以与Ca(OH)2反应生成C-S-H凝胶,后者可以填充缝隙,密实水泥石。膨胀组分可以水化生成早期钙钒石,产生一定微膨胀,抵消水泥水化收缩产生的微裂缝。激发组分可以消耗C3A,阻止其与环境中硫酸根离子反应侵蚀混凝土。
Sulfate erosion damage is one of the important causes of failure of durability of concrete. Marine concrete can easily be damaged by sulfate attack in seawater, which causes erosion of concrete structure and greatly shortens the service life. A developed anti-sulfate preservative composition for concrete consists of a dense component, an expanded component and an excitation component. In order to study the anti-corrosion mechanism of this new preservative, the influence of various components of preservative and the hydration structure of cement and the incorporation of ultrafine slag on the hydration of cement were studied by microscopic test methods such as XRD and SEM. Analysis of the Changes of Hydration Products Based on CSH Gel and AFt Analysis of Microsurgical Preservation Mechanism of New Preservatives. The microscopic analysis shows that the compact component can react with Ca (OH) 2 to form C-S-H gel, which can fill the gap and compact cement stone. Expansion of components can be hydrated early veratrite, resulting in a slight expansion, to offset the hydration shrinkage of cement produced micro-cracks. The excitation component can consume C3A, preventing it from reacting with the sulfate ion in the environment to attack the concrete.