硕士毕业论文代写：混凝土裂缝的自愈合。在混凝土中发现的裂缝是常见的现象。为了在裂缝形成后立即进行处理，必须控制裂缝和控制宽度。基于混凝土结构的维护和修理所涉及的成本，发展的重点是自愈合混凝土。混凝土裂缝的自愈合，延长了混凝土结构的使用寿命。这将使材料更耐用，并增加混凝土的寿命，有相当多的研究使用不同的方法来实现这一范式。接下来硕士毕业论文代写专家将对混凝土裂缝的自愈合进行以下分析。
自愈合
混凝土具有“自愈能力”的特性。混凝土中存在未水化的水泥。当水与水泥相互作用时，就会发生进一步的水化作用。当CO2与Ca2+相互作用时形成CaCO3晶体。这两种方法用于愈合较小的裂缝。为了增强愈合机制，微纤维被添加到混合物中。这种在混凝土中添加的超细纤维会导致多重裂缝的发生。这是基于使用自体愈合。
高吸水性聚合物(SAP)
这些sap是水凝胶，它们能够消耗大量的液体。这是用来保留它们的结构，而不需要溶解的过程。当裂缝发生时，SAP被观察到，每当它暴露在潮湿的环境中，它就会膨胀。这种膨胀被定义为部分闭合裂缝和防止潜在有害物质侵入的反应。在膨胀过程发生后，SAP颗粒通常会解吸化合物，并为周围基质提供更多的液体。这必然导致内部固化。对CaCO3的水化和沉淀还有进一步的要求。这使裂缝完全闭合。混凝土的PH值从12.8下降。对pH敏感水凝胶的研究势在必行。这就导致了裂缝的膨胀，淡水就会渗透进来。
细菌孢子
观察到裂缝愈合使用碳酸钙利用细菌微生物。有机体被观察到并扎根于混凝土基质中。硅藻土固定后，微胶囊中的泥土出现裂缝。这将开始CaCO3的沉淀。这就导致了裂缝的产生。当细菌细胞被另一层CaCO3包裹时，这种裂缝就会发生。这导致了裂纹填充。观察到CaCO3沉淀被硅胶的硅藻土固定。
The cracks that are found in concrete are a common occurrence. This is based on lower tensile strength. It is found that the concrete would be impacted by cracks and this would allow the fluids to flow through, making the whole concreate of no use. In the cases where the micro-cracks grow, there will be a lot of issues in the use of the concrete. It is imperative to control the cracks and control the width in order to treat the cracks as soon as they are formed. Based on the costs involved in the maintenance and the repair of the concrete structures, the focus of the development has been about self-healing concrete. The self-healing of the cracks in the concrete leads to lengthier service life of concrete structure. These would make the material more durable and increase the life of the concrete. There is considerable research that is done to achieve this paradigm using different methods.
Autogenous healing
The concrete has the property of “autogenous healing capacity”. The concrete has un-hydrated cement which is present in the matrix. Whenever water interacts with the cement, there is further hydration that occurs. The CaCO3 crystals are formed when the CO2 interacts with the Ca2+. These two methods are used to heal the smaller cracks. To enhance the healing mechanism, the microfibers are added to the mixture. This addition of the microfiber in the concrete causes multiple cracking to occur. This is based on the use of autogenous healing.
Superabsorbent polymers (SAP)
These SAPs are the hydrogels and they are able to consumer larger amount of the fluids. This is used to retain their structure without the process of dissolving. At times when the cracks occur, SAP has been observed that whenever it is exposed to humid environment, it swells. This swelling is defined as the reaction to partly close the cracks and cause prevention from the intrusion of the potentially harmful substances. After swelling process occurs, the SAP particles generally desorb the compounds and provide more fluid for the surrounding matrix for them. This invariably leads to the internal curing. There is further requirement of hydration and the precipitation of the CaCO3. This causes the cracks to close completely. The PH level in the concrete drops from 12.8. It is imperative to investigate the pH sensitive hydrogels. This causes the swelling of the cracks that occur and the fresh water penetrates.
Bacterial spores
The cracks are observed to be healing from the use of the calcium carbonate by utilizing the bacterial micro-organisms. The organisms are observed and entrenched in the concrete matrix. After the immobilization of the diatomaceous, the earth in the microcapsule shows cracks. This would start the precipitation of CaCO3. This causes the crack to occur. This crack happens whenever the bacterial cell is coated with another layer of CaCO3. This results in the crack filling. The CaCO3 precipitation has been observed to be immobilized on diatomaceous earth of the silica gel.
以上内容就是硕士毕业论文代写专家对混凝土裂缝自愈合的分析。如果同学们没有足够的时间来完成英语论文与作业，论文代写推荐选择美国论文代写AdvancedThesis服务平台。因为其服务公司拥有专业资质的英语论文代写专家团队，保障论文原创质量与合理的论文代写价格，并使用权威的抄袭检测系统，让留学生们轻松应对英语论文写作并创作出专属个人的优秀论文!除此之外，还为留学生提供专业的assignment代写、代写毕业论文、essay代写等服务!