本文選題：混凝土 + 凍融循環(huán)�。� 參考：《西安建筑科技大學(xué)》2013年碩士論文

【摘要】：我國北方寒冷地區(qū)水、土壤中含有豐富的硫酸鹽�；炷猎谠馐芰蛩猁}侵蝕與凍融循環(huán)共同作用時，較單一因素作用會產(chǎn)生更嚴(yán)重的破壞，影響混凝土結(jié)構(gòu)的耐久性。因此開展硫酸鹽侵蝕與凍融循環(huán)共同作用下混凝土耐久性研究有著重要的理論與工程實際意義。 采用快速凍融試驗方法，進行了普通混凝土鹽凍（硫酸鹽）試驗，以硫酸鹽溶液濃度、種類及凍融循環(huán)次數(shù)為主要考察因素，，分析了鹽凍循環(huán)下混凝土外觀、微觀、質(zhì)量、相對動彈性模量、抗壓強度和損傷層厚度的變化規(guī)律；基于宏觀損傷力學(xué)理論，建立了普通混凝土在鹽凍循環(huán)下的損傷演化方程，探討了隨凍融循環(huán)次數(shù)的變化混凝土損傷演變規(guī)律。結(jié)果表明：硫酸鹽溶液對混凝土凍融破壞既存在抑制作用又存在促進作用；隨著凍融循環(huán)次數(shù)的增加，硫酸鹽溶液對混凝土凍融破壞由抑制作用逐漸轉(zhuǎn)變?yōu)榇龠M作用；隨著溶液濃度的增加，硫酸鈉溶液對混凝土的凍融破壞由促進作用逐漸轉(zhuǎn)變?yōu)橐种谱饔谩?開展了水凍和鹽凍（5%硫酸鈉）作用下普通混凝土受壓應(yīng)力-應(yīng)變?nèi)�試驗研究。對普通混凝土棱柱體進行快速凍融循環(huán)后，進行單軸抗壓試驗。得到了水凍和鹽凍作用下普通混凝土應(yīng)力-應(yīng)變?nèi)�方程及相關(guān)參數(shù)。結(jié)果表明：隨著凍融循環(huán)次數(shù)的增加，混凝土受壓應(yīng)力-應(yīng)變?nèi)�逐漸趨于扁平，峰值應(yīng)力、彈性模量不斷下降，峰值應(yīng)變不斷增加。水凍作用下混凝土峰值應(yīng)力、峰值應(yīng)變和彈性模量初期變化較快，鹽凍（5%硫酸鈉）作用下后期變化較快。
[Abstract]:In the cold area of northern China, the soil is rich in sulfate. When the concrete is subjected to sulfate erosion and freeze-thaw cycle, it will cause more serious damage than the single factor, and affect the durability of concrete structure. Therefore, it is of great theoretical and engineering significance to study the durability of concrete under the combined action of sulfate erosion and freeze-thaw cycle. By using the method of rapid freeze-thaw test, the salt freezing (sulfate) test of ordinary concrete was carried out. With the concentration of sulfate solution, type and times of freeze-thaw cycle as the main factors, the appearance, microcosmic and quality of concrete under salt freezing cycle were analyzed. Based on the macroscopic damage mechanics theory, the damage evolution equation of ordinary concrete under salt freezing cycle is established. The damage evolution law of concrete with the number of freeze-thaw cycles is discussed. The results show that sulfate solution can inhibit and promote the freeze-thaw failure of concrete, and with the increase of freeze-thaw cycle times, the freezing and thawing failure of concrete is gradually changed from inhibiting effect to promoting effect by sulfate solution. With the increase of solution concentration, the freezing and thawing failure of concrete caused by sodium sulfate gradually changed from promoting effect to inhibiting effect. An experimental study on the stress-strain curve of ordinary concrete under the action of water freezing and salt freezing (5% sodium sulfate) was carried out. After rapid freeze-thaw cycle of common concrete prism, uniaxial compression test was carried out. The whole stress-strain curve equation and related parameters of ordinary concrete under the action of water freezing and salt freezing are obtained. The results show that with the increase of freeze-thaw cycles, the compressive stress-strain curve of concrete tends to flatten, the peak stress and elastic modulus decrease, and the peak strain increases. The peak stress, the peak strain and the elastic modulus of concrete changed rapidly at the initial stage under the action of water freezing, and the change was faster in the later stage under the action of salt freezing (5% sodium sulfate).
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528.0

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