本文選題：干濕循環(huán)　切入點：鋰渣　出處：《新疆大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國經(jīng)濟水平的提高,基礎(chǔ)設(shè)施的快速發(fā)展,混凝土材料做出巨大貢獻的同時,其因氯鹽腐蝕引起的耐久性失效,不僅造成了經(jīng)濟的巨大浪費,同時還給資源能源以及環(huán)境帶來了巨大壓力�？沙掷m(xù)混凝土的發(fā)展要求未來混凝土不但要向長生命周期的方向發(fā)展,還要減少資源能源的浪費。在保證其性能的同時有效利用工業(yè)廢料來代替水泥熟料,不僅節(jié)約原材料,同時還會減輕工業(yè)廢料堆放帶來的環(huán)境壓力。鋰渣是生產(chǎn)鋰電池所剩的工業(yè)廢料,新疆是我國乃至全亞洲最大的鋰鹽生產(chǎn)基地,鋰渣年堆積量也居全國為數(shù)不多的鋰鹽廠之首。這種地域產(chǎn)業(yè)的局限使鋰渣作為混凝土摻合料的研究相對較少。為此,本文以鋰渣摻量為主要變量,研究了不同水膠比的混凝土,在浸泡和干濕循環(huán)作用下的抗氯離子滲透性能。通過對比侵蝕前后混凝土試件總質(zhì)量的改變,對不同條件下各鋰渣摻量的混凝土抗氯離子滲透性能作出整體評價。得出:相同齡期時,浸泡和干濕循環(huán)的混凝土試件內(nèi)氯離子含量均隨著水膠比的增大線性增加。相同水膠比時,浸泡試件內(nèi)的氯離子滲入總量大于干濕循環(huán)試件;同侵蝕環(huán)境下?lián)饺脘囋脑嚰䞍?nèi)部氯離子含量均小于空白試件,且鋰渣摻量為20%時,內(nèi)部氯離子含量值最小。同時得出,各試件的單位面積氯離子滲入量與齡期之間呈對數(shù)函數(shù)形式增長。對受侵蝕后的混凝土試件鉆芯取樣,依據(jù)規(guī)程對取樣粉末進行水溶性氯離子含量測定,得出各試件內(nèi)部隨著深度的增加氯離子含量減小,且各深度的氯離子含量均隨著齡期的延長而變大。相同配比的試件,干濕循環(huán)作用時其淺層(0-10mm)氯離子含量較浸泡試件增長迅速,至較深處浸泡試件的氯離子濃度較干濕循環(huán)試件大;與空白試件和其它鋰渣摻量的試件相比,20%鋰渣摻量的混凝土試件內(nèi),氯離子濃度均達到最低水平。依實測氯離子濃度與其對應(yīng)深度的關(guān)系,用Origin軟件據(jù)Fick第二定律對氯離子擴散系數(shù)進行擬合。得出,相同水膠比時,浸泡作用的擴散系數(shù)大于干濕循環(huán)作用;水膠比對氯離子擴散系數(shù)的影響較大,鋰渣的摻入有效改善了混凝土的滲透性能。隨著齡期的增加各試件的擴散系數(shù)呈Dt =D1(t1/tn)n 關(guān)系衰減,20%鋰渣摻量混凝土的時間依懶性指數(shù)均大于1,衰減較快。最后,以實測數(shù)據(jù)對混凝土氯離子擴散系數(shù)進行了分層計算和GM(1,1)模擬,對更深層次的氯離子評估提供了方法和依據(jù)。
[Abstract]:With the improvement of economic level and the rapid development of infrastructure in our country, the durability failure caused by chloride corrosion not only caused a huge economic waste, but also made a great contribution to concrete materials. At the same time, it also brings great pressure to resources, energy and environment. The development of sustainable concrete requires that in the future, concrete should not only develop in the direction of long life cycle, We also need to reduce the waste of resources and energy. We can not only save raw materials, but also effectively use industrial waste to replace cement clinker while ensuring its performance. At the same time, it will also alleviate the environmental pressure brought by the industrial waste stacking. Lithium slag is the industrial waste surplus from the production of lithium batteries, and Xinjiang is the largest base for lithium salt production in China and even in Asia as a whole. The annual accumulation of lithium slag also ranks first among the few lithium salt plants in China. Due to the limitation of this kind of regional industry, the research on lithium slag as concrete admixture is relatively few. Therefore, the content of lithium slag is the main variable in this paper. The penetration resistance of concrete with different water-binder ratio under the action of wet and dry cycles was studied. The total quality of concrete specimens before and after erosion was compared. An overall evaluation of chloride penetration resistance of concrete with different lithium slag content under different conditions is made. It is concluded that: at the same age, The chlorine ion content in the concrete samples soaked and dry-wet cycle increased linearly with the increase of water-binder ratio. When the water-binder ratio was the same, the total amount of chloride ion infiltration in the soaking specimens was larger than that in the dry-wet cycle specimens. In the same erosion environment, the content of chlorine ions in the samples doped with lithium slag is smaller than that of the blank specimens, and the content of chlorine ions in the samples is the smallest when the content of lithium slag is 20. At the same time, it is concluded that, The amount of chloride ion penetration per unit area of each specimen increased in the form of logarithmic function between the age and the age. The sample was sampled from the drill core of the corroded concrete sample, and the water soluble chloride ion content of the sample powder was determined according to the rules. The results show that the chlorine ion content in each specimen decreases with the increase of depth, and the chloride ion content in each depth increases with the increase of age. The chlorine ion content in the shallow layer of dry and wet cycle increased rapidly than that in the soaking specimen, and the chloride concentration of the sample soaked in the deeper part was larger than that of the wet and dry cycle specimen. Compared with the blank specimen and other samples with lithium slag content, the chloride ion concentration in concrete samples with 20% lithium slag content reaches the lowest level. According to the relationship between the measured chlorine ion concentration and the corresponding depth, According to the second law of Fick, the diffusion coefficient of chloride ion is fitted by Origin software. It is concluded that the diffusion coefficient of soaking is larger than that of dry and wet cycle at the same water / binder ratio, and the influence of water / binder ratio on the diffusion coefficient of chloride ion is greater than that of wet and dry circulation. With the increase of age, the diffusion coefficient of each sample decreases with the increase of age. The time dependent exponent of 20% lithium slag added concrete is larger than 1, and the attenuation is faster. Based on the measured data, the chloride diffusion coefficient of concrete is calculated by stratification and simulated by GM1 / 1), which provides a method and basis for the further evaluation of chloride ions.
【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

【參考文獻】

相關(guān)期刊論文 前10條

1 朱燕;梅華;陳佳佳;;礦物摻合料與化學外加劑影響混凝土抗氯離子滲透性的試驗研究[J];硅酸鹽通報;2016年11期

2 巫茂寅;王起才;張凱;董陽濤;王小龍;;礦物摻合料對高性能混凝土抗?jié)B性及抗凍性的影響研究[J];公路;2016年09期

3 達波;余紅發(fā);麻海燕;張亞棟;譚永山;糜人杰;竇雪梅;;全珊瑚海水混凝土的表面自由氯離子濃度和表觀氯離子擴散系數(shù)[J];東南大學學報(自然科學版);2016年05期

4 傅巧瑛;劉榮桂;延永東;李琮琦;楊金木;;水灰比和應(yīng)力水平對混凝土中氯離子傳輸?shù)挠绊慬J];硅酸鹽通報;2016年08期

5 達波;余紅發(fā);麻海燕;張亞棟;朱海威;余強;葉海民;景顯雙;;南海島礁普通混凝土結(jié)構(gòu)耐久性的調(diào)查研究[J];哈爾濱工程大學學報;2016年08期

6 閆長旺;李杰;張菊;劉曙光;;西部氯鹽漬土介質(zhì)中混凝土的氯離子擴散性[J];功能材料;2016年02期

7 王月;安明U，

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