玄武岩纤维对轻集料混凝土性能影响的研究

发布时间：2018-03-20 15:03

本文选题：轻集料混凝土　切入点：混凝土抗冻性　出处：《吉林建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：全球气候会议(IPPC)指出人类活动成为影响自然环境的主要原因,全球气温将持续升高。随着人类改造自然满足自身需求,城市化影响加剧,建筑行业的绿色化和低碳化甚至零碳化趋势升高。地处吉林省长白山火山地形带附近蕴藏着大量火山渣和玄武岩资源。本文通过利用绿色建筑材料实现改变掺合料合理级配来改善轻集料混凝土的性能,掺加玄武岩纤维来改善抗裂性能,由于玄武岩纤维表面存在化学惰性与混凝土结合能力差的问题,采用NaOH与水玻璃综合改性玄武岩纤维,制备高性能的火山渣轻集料混凝土。具体的工作内容如下:(1)通过利用正交试验来改善轻集料混凝土的和易性问题,优化胶凝材料的级配,改善火山渣轻集料混凝土的力学及耐久性的问题。(2)针对轻集料混凝土易开裂、脆性大等问题。采取在轻集料火山渣混凝土中掺加玄武岩纤维的技术来改善轻集料火山渣混凝土的韧性,并抑制轻集料混凝土易开裂的问题。试验证明,掺加玄武岩纤维不仅增强了轻集料混凝土的韧性,提高抗裂性,并解决了轻集料混凝土的离析问题,而且对轻集料火山渣混凝土的抗冻性有所提高。(3)玄武岩纤维具有较高的弹性模量,较强的力学性能,但其表面存在化学惰性问题。为了充分利用其优异的力学性能,用NaOH与水玻璃综合改性玄武岩纤维,从碱浓度、温度、时间等方面对其研究并讨论。(4)利用改性后的玄武岩纤维与活性硅灰拌合,在玄武岩纤维表面形成箍型的保护层,加入火山渣轻集料混凝土后,增加了玄武岩纤维表面与胶凝材料的机械咬合力,提高了强度,改善了和易性,增大了密实度。(5)抗冻性在我国北方城市建筑行业是一个重要的指标,研究了基准火山渣轻集料混凝土、玄武岩纤维火山渣轻集料混凝土、改性玄武岩纤维火山渣轻集料混凝土抗冻性。试验表明,玄武岩纤维的加入大大提高了混凝土的和易性及密实度,改善了孔结构,提高了火山渣轻集料混凝土的抗冻性。
[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.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.2

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