凍融循環(huán)作用下鋼纖維混凝土的力學(xué)性能研究
[Abstract]:In the cold region of northern China, freeze-thaw damage has become one of the main diseases of concrete structures due to the positive and negative temperature alternation caused by climate change, which has seriously affected the safe use and long-term operation of concrete structures. The frost resistance of concrete is one of the important indexes to evaluate the durability of concrete. The long-term freeze-thaw cycle will lead to the serious decline of the durability of concrete and the deterioration of the mechanical properties of concrete. The addition of steel fiber in concrete can effectively improve the durability of concrete and improve the mechanical properties of concrete under the action of freeze-thaw cycle. With the rapid development of China's national economy, the application of steel fiber reinforced concrete (SFRC) has been gradually popularized. Therefore, it is of great practical significance to study the mechanical properties of steel fiber reinforced concrete (SFRC). Through theoretical analysis and experimental study, the main work accomplished in this paper is as follows: 1. The steel fiber concrete specimens with 0 0. 75% steel fiber content and 1.5% steel fiber content are made in this paper, and freeze-thaw cycle tests are carried out on concrete specimens. After 0, 50, 100, 150 and 200 freeze-thaw cycles were carried out respectively, the mass loss and dynamic elastic modulus of concrete specimens were measured for each 50 freeze-thaw cycles, and the number and loss of freeze-thaw cycles were plotted. The curve of relative dynamic modulus. The results show that with the increase of steel fiber content, the anti-denudation ability of concrete increases, and the steel fiber has the effect of toughening and cracking resistance. 2. After freeze-thaw cycle test, The cube compressive strength test and the prism flexural strength test were carried out on the steel fiber reinforced concrete specimens after freezing and thawing. The failure patterns of the concrete specimens were observed and the compressive strength and the flexural strength data of the specimens were recorded. The relationship curves of compressive strength, flexural strength and freeze-thaw cycle times of concrete specimens with different steel fiber content were drawn, and the effects of steel fiber volume content and freeze-thaw cycle times on the mechanical properties of concrete were analyzed. The results show that at the initial stage of freezing and thawing, the influence of steel fiber on the compressive strength and flexural strength of concrete is great, but with the increase of freeze-thaw cycle times, the influence of steel fiber on the mechanical properties of concrete is small. 3. Through the above experimental results and theoretical analysis, The influence of steel fiber on the durability of concrete is studied, and the mechanism of freeze-thaw damage of steel fiber concrete is analyzed. The damage model of freeze-thaw damage is established, which provides a theoretical basis for the establishment of durability index of steel fiber concrete.
【學(xué)位授予單位】:湖北工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU528.572
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