有機酸對紅黏土置換水泥土樁的腐蝕性試驗研究
發(fā)布時間：2018-10-29 13:00
【摘要】：地下水土環(huán)境可能對地下結(jié)構(gòu)產(chǎn)生腐蝕,導(dǎo)致其強度降低,最終危及整個建(構(gòu))筑物的安全,研究各種地下水土環(huán)境對地下結(jié)構(gòu)的影響有非常重要理論和實際價值。論文以紅黏土水泥土復(fù)合體為研究對象,通過強度試驗和浸泡試驗分別探討了：紅黏土水泥土復(fù)合體無側(cè)限抗壓強度與水泥摻入比、齡期的關(guān)系和有機酸(檸檬酸、富里酸、水楊酸、草酸)與紅黏土水泥土復(fù)合體的相互作用機理。主要做了以下研究工作： (1)紅黏土水泥土復(fù)合體的無側(cè)限抗壓強度可達2MPa以上,其強度對水泥摻入比的敏感度隨摻入比的提高而降低；前期強度與90天強度的比值隨水泥摻入比的增加而減小,用前期強度估算90天強度時,應(yīng)考慮摻入比的影響。 (2)檸檬酸對紅黏土水泥土復(fù)合體具有強烈的腐蝕性,其侵蝕過程可分為耗酸速率快速下降、穩(wěn)定、波動變化三個階段；pH值大于4.5時,其侵蝕以分解溶蝕作用為主；pH值小于3.5時,以結(jié)晶膨脹作用為主；pH值在3.5與4.5之間時,兩種作用共存,其中表層以分解溶蝕作用為主,內(nèi)部以結(jié)晶膨脹作用為主；在此基礎(chǔ)上建立了檸檬酸侵蝕紅黏土水泥土復(fù)合體的腐蝕預(yù)測模型。 (3)富里酸對養(yǎng)護3天的紅黏土水泥土復(fù)合體具有一定腐蝕性,對養(yǎng)護37天的紅黏土水泥土復(fù)合體的腐蝕性較弱,其侵蝕過程可分為快速反應(yīng)和緩慢反應(yīng)兩個階段,其中以第一階段的侵蝕為主,第二階段侵蝕作用較弱。 (4)水楊酸對紅黏土水泥土復(fù)合體具有較強的腐蝕性,pH值越小腐蝕性越強,其侵蝕主要以對水泥水化產(chǎn)物的分解溶蝕為主；整個侵蝕過程可分為耗酸速率快速下降和穩(wěn)定兩個階段；模型f(t)=atb能很好的描述不同pH值對應(yīng)的耗酸量隨時間的變化關(guān)系。 (5)草酸對紅黏土水泥土復(fù)合體的侵蝕過程為一個分解和重結(jié)晶過程,紅黏土水泥土復(fù)合體中水泥水化產(chǎn)物和三氧化二鐵被分解,重結(jié)晶生成難容的草酸鈣(CaC204)和草酸亞鐵(FeC204)；整個侵蝕過程可分為三個階段：結(jié)晶層形成階段,過渡階段,快速反應(yīng)階段,前兩階段主要以對水泥水化產(chǎn)物的分解轉(zhuǎn)化為主,第三階段既存在對水泥水化產(chǎn)物的分解轉(zhuǎn)化,也存在對紅黏土中氧化鐵的分解轉(zhuǎn)化。 (6)有機酸對紅黏土水泥土復(fù)合體的侵蝕過程不僅與溶液pH值有關(guān),溶液中有機酸種類也是一個決定性的因素,有機酸種類不同侵蝕機理也存在差異,最終產(chǎn)生的破壞作用也不相同。
[Abstract]:The underground soil and water environment may corrode the underground structure, resulting in its strength decreasing, and finally endangering the safety of the whole building. It is of great theoretical and practical value to study the influence of various underground soil and water environment on the underground structure. This paper takes the red clay cement-soil complex as the research object, through strength test and soaking test, discusses the relationship between the unconfined compressive strength of the red clay cement-soil complex and the ratio of cement to cement, age and organic acid (citric acid, fulvic acid, citric acid, fulvic acid). The interaction mechanism between salicylic acid (oxalic acid) and red clay cement-soil complex. The main work is as follows: (1) the unconfined compressive strength of red clay cement-soil complex can reach 2MPa, and the sensitivity of strength to cement blending ratio decreases with the increase of cement ratio; The ratio of pre-strength to 90-day strength decreases with the increase of cement blending ratio. (2) citric acid has a strong corrosive effect on the cement-soil complex of red clay, and the erosion process can be divided into three stages: the acid consumption rate decreases rapidly, the acid consumption rate is stable and fluctuates, and when the pH value is greater than 4. 5, the corrosion process is dominated by decomposition and dissolution. When the pH value is less than 3. 5, the effect of crystallization expansion is dominant, and when the pH value is between 3. 5 and 4. 5, the two interactions coexist, in which the surface layer is mainly composed of decomposition and dissolution, and the inner layer is dominated by crystallization expansion. On this basis, the corrosion prediction model of citric acid erosion red clay cement soil complex is established. (3) Furic acid is corrosive to the red clay cement-soil complex for 3 days, and weak to the red clay cement soil complex for 37 days. The erosion process can be divided into two stages: quick reaction and slow reaction. Among them, the first stage of erosion is the main, the second stage of erosion is weak. (4) salicylic acid has strong corrosiveness to the cement soil complex of red clay, the smaller the pH value is, the stronger the corrosion is, and the main erosion is the decomposition and dissolution of cement hydration products; The whole process of erosion can be divided into two stages: the fast decreasing of acid consumption rate and the stable stage, and the model f (t) = atb can well describe the relationship between the acid consumption and the time of different pH values. (5) the erosion process of oxalic acid to red clay cement soil complex is a process of decomposition and recrystallization, and the hydration products of cement and iron trioxide in red clay cement soil complex are decomposed. Recrystallization produces intolerable calcium oxalate (CaC204) and ferrous oxalate (FeC204). The whole process of erosion can be divided into three stages: crystalline layer formation stage, transition stage, rapid reaction stage, the first two stages are mainly to decompose the hydration products of cement into the main, the third stage is the decomposition and transformation of cement hydration products. There is also the decomposition and transformation of iron oxide in red clay. (6) the erosion process of organic acid to cement-soil complex of red clay is related not only to the pH value of solution, but also to the type of organic acid in solution, and the erosion mechanism of organic acid is also different. The ultimate destructive effect is also different.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU473.1
本文編號：2297766
[Abstract]:The underground soil and water environment may corrode the underground structure, resulting in its strength decreasing, and finally endangering the safety of the whole building. It is of great theoretical and practical value to study the influence of various underground soil and water environment on the underground structure. This paper takes the red clay cement-soil complex as the research object, through strength test and soaking test, discusses the relationship between the unconfined compressive strength of the red clay cement-soil complex and the ratio of cement to cement, age and organic acid (citric acid, fulvic acid, citric acid, fulvic acid). The interaction mechanism between salicylic acid (oxalic acid) and red clay cement-soil complex. The main work is as follows: (1) the unconfined compressive strength of red clay cement-soil complex can reach 2MPa, and the sensitivity of strength to cement blending ratio decreases with the increase of cement ratio; The ratio of pre-strength to 90-day strength decreases with the increase of cement blending ratio. (2) citric acid has a strong corrosive effect on the cement-soil complex of red clay, and the erosion process can be divided into three stages: the acid consumption rate decreases rapidly, the acid consumption rate is stable and fluctuates, and when the pH value is greater than 4. 5, the corrosion process is dominated by decomposition and dissolution. When the pH value is less than 3. 5, the effect of crystallization expansion is dominant, and when the pH value is between 3. 5 and 4. 5, the two interactions coexist, in which the surface layer is mainly composed of decomposition and dissolution, and the inner layer is dominated by crystallization expansion. On this basis, the corrosion prediction model of citric acid erosion red clay cement soil complex is established. (3) Furic acid is corrosive to the red clay cement-soil complex for 3 days, and weak to the red clay cement soil complex for 37 days. The erosion process can be divided into two stages: quick reaction and slow reaction. Among them, the first stage of erosion is the main, the second stage of erosion is weak. (4) salicylic acid has strong corrosiveness to the cement soil complex of red clay, the smaller the pH value is, the stronger the corrosion is, and the main erosion is the decomposition and dissolution of cement hydration products; The whole process of erosion can be divided into two stages: the fast decreasing of acid consumption rate and the stable stage, and the model f (t) = atb can well describe the relationship between the acid consumption and the time of different pH values. (5) the erosion process of oxalic acid to red clay cement soil complex is a process of decomposition and recrystallization, and the hydration products of cement and iron trioxide in red clay cement soil complex are decomposed. Recrystallization produces intolerable calcium oxalate (CaC204) and ferrous oxalate (FeC204). The whole process of erosion can be divided into three stages: crystalline layer formation stage, transition stage, rapid reaction stage, the first two stages are mainly to decompose the hydration products of cement into the main, the third stage is the decomposition and transformation of cement hydration products. There is also the decomposition and transformation of iron oxide in red clay. (6) the erosion process of organic acid to cement-soil complex of red clay is related not only to the pH value of solution, but also to the type of organic acid in solution, and the erosion mechanism of organic acid is also different. The ultimate destructive effect is also different.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU473.1
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