【摘要】：鋰渣作為工業(yè)生產鋰鹽的副產品,長時間以來都被當作廢料棄用,如能在混凝土中合理的利用鋰渣不僅有利于環(huán)境的保護而且能有利于建筑結構的發(fā)展。新疆地區(qū)屬于嚴寒鹽漬地地區(qū),混凝土在長期服役過程中因為環(huán)境因素作用,耐久性問題日益嚴重。所以本文在凍融循環(huán)作用下、自然浸泡作用下探究不同鋰渣粉摻量對混凝土氣體滲透性能、氯離子滲透性能的影響,在此基礎上探究氣體滲透系數與電通量之間的相關性,氯離子擴散系數與電通量之間的關系,通過壓汞法探究了鋰渣粉對混凝土孔結構的影響、鋰渣混凝土滲透性能與孔結構參數的關系;最后利用相關理論推導適用于Autoclam滲透儀的擴散系數公式。本文首先測定不同強度等級鋰渣混凝土在各齡期的抗壓強度和氣體滲透系數,并測定28d時的電通量值,結果表明:在鋰渣粉摻量10%時,各強度等級混凝土的28d抗壓強度提升明顯;混凝土在一定鋰渣摻量下,其氣體滲透系數和電通量值有明顯降低。且發(fā)現氣體滲透系數與齡期之間存在良好的函數關系、電通量值與初始電流相關性較好。其次本文在快速凍融法的基礎上,測定鋰渣混凝土的質量損失、抗壓強度、氣體滲透系數、電通量值,結果表明:抗壓強度和凍融次數有良好的數學關系,隨凍融次數增加抗壓強度按一定比例損失;氣體滲透系數、電通量值與凍融次數之間均為一次函數關系,氣體滲透系數與電通量值都隨著凍融次數的增加而增加,摻入鋰渣粉能降低混凝土電通量值;氣體滲透系數與電通量值相關較好,氣體滲透系數隨電通量值增加而增加�；谧匀唤莘ㄌ骄柯入x子擴散系數,結果表明:氯離子擴散系數隨著NaCl濃度的增加而增加,隨著浸泡時間的增加而降低;鋰渣混凝土在NaCl溶液中浸泡一定時間后,其氯離子擴散系數與28天電通值均會隨鋰渣摻量的增加而降低。最后本文在壓汞法的基礎上,測定摻鋰渣混凝土的臨界孔徑、最可幾孔徑、平均孔徑、孔隙率,結果表明:臨界孔徑、最可幾孔徑均隨齡期增加而減小,鋰渣粉的摻入會減小臨界孔徑大小,增大最可幾孔徑。氣體滲透系數和電通量均隨臨界孔徑增加而增加。C30、C60分別在摻量為20%、30%時有最大的孔曲折度。
[Abstract]:Lithium slag, as a by-product of industrial production of lithium salt, has been used as waste material for a long time. If lithium slag can be used reasonably in concrete, it is not only beneficial to the protection of environment but also to the development of building structure. Xinjiang is a cold and salinized area. The durability of concrete is becoming more and more serious due to environmental factors in the long service. Therefore, under the action of freeze-thaw cycle and natural immersion, this paper explores the influence of different amount of lithium slag powder on the permeability of concrete gas and chloride ion, and on this basis explores the correlation between gas permeability coefficient and electric flux. The influence of lithium slag powder on pore structure of concrete and the relationship between permeability of lithium slag concrete and pore structure parameters were investigated by mercury injection method. Finally, the diffusion coefficient formula suitable for Autoclam osmometer is derived by using relevant theory. In this paper, the compressive strength and gas permeability coefficient of lithium slag concrete of different strength grades at different ages are measured, and the electric flux value of 28 days is measured. The results show that when the amount of lithium slag powder is 10, The 28d compressive strength of concrete of different strength grades is obviously increased, and the gas permeability coefficient and electric flux value of concrete with a certain amount of lithium slag are obviously decreased. It is found that there is a good functional relationship between the gas permeability coefficient and the age, and the electric flux has a good correlation with the initial current. Secondly, on the basis of rapid freeze-thaw method, the mass loss, compressive strength, gas permeability coefficient and electric flux of lithium slag concrete are measured. The results show that there is a good mathematical relationship between compressive strength and freeze-thaw times. With the increase of freezing and thawing times, the compressive strength is lost in a certain proportion, the gas permeability coefficient, electric flux value and freeze-thaw number are all first function relations, the gas permeability coefficient and electric flux value all increase with the increase of freeze-thaw times. The electric flux value of concrete can be reduced by adding lithium slag powder, the gas permeability coefficient is better correlated with the electric flux value, and the gas permeability coefficient increases with the increase of the electric flux value. Based on the natural immersion method, the chloride diffusion coefficient was investigated. The results show that the chloride diffusion coefficient increases with the increase of NaCl concentration and decreases with the increase of immersion time, and the lithium slag concrete is immersed in NaCl solution for a certain time. The chloride diffusion coefficient and 28 days electric flux value will decrease with the increase of lithium slag content. Finally, on the basis of mercury injection method, the critical pore size, maximum pore size, average pore size and porosity of lithium-doped slag concrete are determined. The results show that the critical pore size and the most available pore size decrease with the increase of age. The addition of lithium slag powder can decrease the critical pore size and increase the maximum pore size. The gas permeability coefficient and the electric flux increase with the increase of critical pore size. C30C60 has the largest pore zigzag when the content is 20%.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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