本文選題：輕集料混凝土　切入點：混凝土抗凍性　出處：《吉林建筑大學》2017年碩士論文　論文類型：學位論文

【摘要】：全球氣候會議(IPPC)指出人類活動成為影響自然環(huán)境的主要原因,全球氣溫將持續(xù)升高。隨著人類改造自然滿足自身需求,城市化影響加劇,建筑行業(yè)的綠色化和低碳化甚至零碳化趨勢升高。地處吉林省長白山火山地形帶附近蘊藏著大量火山渣和玄武巖資源。本文通過利用綠色建筑材料實現(xiàn)改變摻合料合理級配來改善輕集料混凝土的性能,摻加玄武巖纖維來改善抗裂性能,由于玄武巖纖維表面存在化學惰性與混凝土結合能力差的問題,采用NaOH與水玻璃綜合改性玄武巖纖維,制備高性能的火山渣輕集料混凝土。具體的工作內容如下:(1)通過利用正交試驗來改善輕集料混凝土的和易性問題,優(yōu)化膠凝材料的級配,改善火山渣輕集料混凝土的力學及耐久性的問題。(2)針對輕集料混凝土易開裂、脆性大等問題。采取在輕集料火山渣混凝土中摻加玄武巖纖維的技術來改善輕集料火山渣混凝土的韌性,并抑制輕集料混凝土易開裂的問題。試驗證明,摻加玄武巖纖維不僅增強了輕集料混凝土的韌性,提高抗裂性,并解決了輕集料混凝土的離析問題,而且對輕集料火山渣混凝土的抗凍性有所提高。(3)玄武巖纖維具有較高的彈性模量,較強的力學性能,但其表面存在化學惰性問題。為了充分利用其優(yōu)異的力學性能,用NaOH與水玻璃綜合改性玄武巖纖維,從堿濃度、溫度、時間等方面對其研究并討論。(4)利用改性后的玄武巖纖維與活性硅灰拌合,在玄武巖纖維表面形成箍型的保護層,加入火山渣輕集料混凝土后,增加了玄武巖纖維表面與膠凝材料的機械咬合力,提高了強度,改善了和易性,增大了密實度。(5)抗凍性在我國北方城市建筑行業(yè)是一個重要的指標,研究了基準火山渣輕集料混凝土、玄武巖纖維火山渣輕集料混凝土、改性玄武巖纖維火山渣輕集料混凝土抗凍性。試驗表明,玄武巖纖維的加入大大提高了混凝土的和易性及密實度,改善了孔結構,提高了火山渣輕集料混凝土的抗凍性。
[Abstract]:The Global Climate Conference (IPPC) points out that human activities are the main cause of the impact on the natural environment and that global temperatures will continue to rise. As humans adapt nature to meet their own needs, the impact of urbanization increases. The trend of green and low carbonization or even zero carbonization of construction industry is rising. There are a lot of volcanic slag and basalt resources near the Changbai Mountain volcanic topographic belt in Jilin Province. This paper uses green building materials to change the blending. Reasonable grading of materials to improve the performance of lightweight aggregate concrete, Adding basalt fiber to improve the crack resistance, because of the problem of poor chemical inert and concrete binding ability on the surface of basalt fiber, the basalt fiber is modified by NaOH and sodium silicate. Preparation of high performance volcanic slag lightweight aggregate concrete. The specific work is as follows: 1) by using orthogonal tests to improve the ease of lightweight aggregate concrete and optimize the gradation of cementitious materials, To improve the mechanics and durability of lightweight aggregate concrete with volcanic slag. The technology of adding basalt fiber into lightweight aggregate volcanic slag concrete is adopted to improve the toughness of light aggregate volcanic slag concrete and to restrain the cracking of light aggregate volcanic slag concrete. The addition of basalt fiber not only enhances the toughness and crack resistance of lightweight aggregate concrete, but also solves the segregation problem of lightweight aggregate concrete. Moreover, the frost resistance of light aggregate volcanic slag concrete has been improved. 3) basalt fiber has higher elastic modulus and stronger mechanical properties, but its surface has chemical inert problem. In order to make full use of its excellent mechanical properties, The basalt fiber modified by NaOH and sodium silicate is studied and discussed from the aspects of alkali concentration, temperature and time. The modified basalt fiber is mixed with active silica fume to form a hoop protective layer on the surface of basalt fiber. With the addition of volcanic slag lightweight aggregate concrete, the mechanical bite force between basalt fiber surface and cementitious material is increased, and the strength and easiness are improved. The freezing resistance is an important index in the urban construction industry of northern China. The basic volcanic slag lightweight aggregate concrete, basalt fiber volcanic slag lightweight aggregate concrete, basalt fiber volcanic slag lightweight aggregate concrete are studied. The experiment shows that the addition of basalt fiber can greatly improve the compatibility and compactness of concrete, improve the pore structure and improve the frost resistance of light aggregate concrete with volcanic slag.
【學位授予單位】：吉林建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528.2

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本文編號：1639600