本文選題：高原環(huán)境 + 混凝土��； 參考：《西南交通大學》2017年碩士論文

【摘要】：鋼筋混凝土作為一種常見的建筑材料,由于性能優(yōu)越、耐久性好、價格低廉,在工程建設中被廣泛使用。由于國內外均發(fā)生了鋼筋混凝土未達到設計使用年限而出現(xiàn)過早損壞的情況,學術界開展了大量研究,以明確鋼筋混凝土劣化機理,并通過設計、施工規(guī)范對混凝土劣化予以預防。但是針對高原環(huán)境下混凝土劣化機理的研究相對較少,混凝土劣化與施工質量的關聯(lián)更缺乏研究。鑒于此,本文立足于現(xiàn)有理論基礎,結合高原施工的實際工程,針對高原地區(qū)施工具體情況,重點探討高原環(huán)境下導致混凝土劣化的主要因素和如何通過加強施工管理、改良施工技術以提升混凝土質量,從而抑制高原地區(qū)混凝土劣化,最終達到提升混凝土耐久性能的目的。本文首先通過追蹤工程實例明確了高原環(huán)境下對混凝土劣化影響最大的主要在于凍融循環(huán)造成的破壞,同時高原獨特的氣候條件造成混凝土碳化與內陸存在一定差異,向陽、背陰側碳化速度不同將導致向陽側混凝土更早中性化,失去對鋼筋的保護而導致結構過早破壞。其次,通過對部分項目進行施工技術上的調整,尋找對抗凍融循環(huán)和混凝土表面碳化對鋼筋混凝土造成傷害的辦法,主要包括以減小孔隙率為目的提升混凝土密實度、以防止外界水滲入混凝土內部為目的的防水措施和以提高混凝土早期強度為目的的添加外加劑等方法。論文研究結合施工分別單獨調整某個技術措施,以尋找影響混凝土劣化的主要原因,以尋求解決混凝土劣化最有效的措施。再次,結合已發(fā)生的高原工程出現(xiàn)混凝土堿骨料反應的實際,總結了在施工管理中預防堿骨料反應應注意的事項和可采取的技術措施,主要包括通過控制堿含量、控制骨料活性物、防止水滲入等方式預防堿骨料反應。最后,結合高原環(huán)境條件和施工實際,從管理上提出增進混凝土施工質量的措施。
[Abstract]:As a common building material, reinforced concrete is widely used in engineering because of its superior performance, good durability and low price. Because of the premature damage of reinforced concrete which has not reached the design life at home and abroad, the academic circles have carried out a lot of research to clarify the deterioration mechanism of reinforced concrete, and through the design, Construction code to prevent concrete deterioration. However, there are few researches on the deterioration mechanism of concrete in plateau environment, and the relation between concrete deterioration and construction quality is even less. In view of this, this paper bases on the existing theory foundation, unifies the plateau construction actual project, according to the plateau area construction concrete situation, emphatically discusses the plateau environment causes the concrete deterioration main factor and how to strengthen the construction management, In order to improve the quality of concrete and restrain the deterioration of concrete in plateau area, the purpose of improving the construction technology is to improve the durability of concrete. First of all, by tracing the engineering examples, this paper makes it clear that the greatest influence on concrete deterioration in plateau environment is mainly caused by the damage caused by freeze-thaw cycle, and at the same time, the concrete carbonization caused by the unique climatic conditions in the plateau is different from that in the interior. Different carbonation speed of the back side will lead to the early neutralization of the concrete in the sunny side, and the loss of the protection of the reinforcement will lead to premature destruction of the structure. Secondly, by adjusting the construction technology of some projects, to find ways to resist freeze-thaw cycle and carbonization of concrete surface to cause damage to reinforced concrete, mainly including raising the density of concrete for the purpose of reducing porosity. The waterproof measures aimed at preventing the external water from infiltrating into the concrete interior and the adding of admixture to improve the early strength of concrete are discussed. In order to find out the main causes of concrete deterioration and to find out the most effective measures to solve the deterioration of concrete, some technical measures are adjusted separately in combination with construction in this paper. Thirdly, combined with the actual occurrence of concrete alkali aggregate reaction in plateau engineering, this paper summarizes the matters needing attention and the technical measures to be taken to prevent alkali aggregate reaction in construction management, including mainly through controlling the alkali content. Control aggregate activity, prevent water infiltration and other ways to prevent alkali aggregate reaction. Finally, combined with the environmental conditions of plateau and construction practice, the measures to improve the quality of concrete construction are put forward from the point of view of management.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528;TU755

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