發(fā)布時間：2018-05-31 05:38

  本文選題：寒冷地區(qū)海洋環(huán)境 + 混凝土橋梁��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：寒冷地區(qū)海洋環(huán)境下混凝土橋梁同時受到低溫條件和海洋環(huán)境的影響,常因耐久性不足提前失效而引發(fā)安全問題,造成巨大的經(jīng)濟損失。因此,開展寒冷地區(qū)海洋環(huán)境下混凝土橋梁耐久性研究,具有重要的理論意義和工程指導(dǎo)意義。本文以曹妃甸工業(yè)區(qū)青龍河大橋和納潮河2#大橋為依托,結(jié)合工程實際環(huán)境,選取影響混凝土橋梁耐久性最主要的凍融循環(huán)、碳化作用和氯離子侵蝕作用進(jìn)行重點研究。通過設(shè)計海工高性能混凝土耐久性綜合試驗,研究不同水膠比、粉煤灰摻量和含氣量等因素影響下混凝土抗凍性能、抗碳化性能及抗?jié)B性能變化規(guī)律。通過凍融與氯鹽鹽凍試驗,研究了混凝土質(zhì)量損失率、相對動彈性模量及抗壓強度損失率等抗凍性能評價指標(biāo)在不同影響因素作用下的變化規(guī)律,并進(jìn)行試驗對比分析了氯離子對抗凍性能的影響。研究表明氯鹽鹽凍的質(zhì)量損失率為抗凍破壞控制指標(biāo),對其進(jìn)行多元線性回歸分析,建立了鹽凍混凝土質(zhì)量衰減預(yù)測模型,并驗證了模型的適用性。通過碳化試驗研究了不同因素對混凝土抗碳化性能的影響,分析了碳化深度隨時間發(fā)展的變化規(guī)律,并擬合回歸試驗結(jié)果對經(jīng)驗預(yù)測模型進(jìn)行了驗證。通過毛細(xì)吸水試驗研究了不同因素對混凝土抗?jié)B性能的影響,驗證了毛細(xì)吸水量與吸水時間的關(guān)系,并回歸計算得到不同配合比混凝土毛細(xì)吸收系數(shù)�；谀途眯跃C合試驗研究結(jié)果和工程實際,從結(jié)構(gòu)構(gòu)造設(shè)計和施工技術(shù)改進(jìn)兩方面,對寒冷地區(qū)海洋環(huán)境下混凝土橋梁耐久性提升方法進(jìn)行研究,為今后類似環(huán)境下修建混凝土橋梁提供借鑒。
[Abstract]:Under the cold environment, concrete bridges are affected by both low temperature and marine environment, which often lead to safety problems due to insufficient durability and early failure, resulting in huge economic losses. Therefore, it is of great theoretical and engineering significance to study the durability of concrete bridges in the cold marine environment. Based on Qinglong River Bridge and Naochao River Bridge in Caofeidian Industrial Zone, combined with the actual engineering environment, this paper focuses on the selection of freeze-thaw cycle, carbonation and chloride ion erosion, which affect the durability of concrete bridge. Based on the comprehensive test of durability of marine high performance concrete, the changes of frost resistance, carbonation resistance and impermeability of concrete under the influence of different water / binder ratio, fly ash content and air content were studied. Through freeze-thaw test and chloride salt freezing test, the variation law of frost resistance evaluation indexes such as mass loss rate, relative dynamic modulus of elasticity and compressive strength loss rate of concrete under different influence factors were studied. The effects of chloride ions on the frost resistance were compared and analyzed. The study shows that the mass loss rate of chloride salt freezing is the control index of frost resistance. The multivariate linear regression analysis is carried out, and the prediction model of mass attenuation of salt frozen concrete is established, and the applicability of the model is verified. The influence of different factors on the carbonation resistance of concrete is studied by carbonization test. The variation of carbonation depth with time is analyzed and the empirical prediction model is verified by fitting the results of regression test. The effect of different factors on the impermeability of concrete was studied by capillary water absorption test. The relationship between capillary water absorption and water absorption time was verified and the capillary absorption coefficient of concrete with different mix ratio was obtained by regression calculation. Based on the results of comprehensive durability test and engineering practice, the durability lifting method of concrete bridges in cold marine environment is studied from two aspects of structural design and construction technology improvement. It provides reference for the construction of concrete bridge under similar environment in the future.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.33

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孫曉燕;潘宏;徐沖;;沿海與近海地區(qū)混凝土橋梁耐久性研究進(jìn)展[J];工業(yè)建筑;2011年S1期

2 周茗如;高揚;孫云飚;陶嵐;喬宏霞;;粉煤灰混凝土抗鹽凍性能的研究[J];粉煤灰綜合利用;2009年04期

3 陳迅捷;歐陽幼玲;;海洋環(huán)境中混凝土抗凍融循環(huán)試驗研究[J];水利水運工程學(xué)報;2009年02期

4 聞寶聯(lián);張紅衛(wèi);王春陽;李美丹;;天津濱海地區(qū)鋼筋混凝土橋梁病害調(diào)查與耐久性設(shè)計[J];城市道橋與防洪;2008年01期

5 徐輝;李克亮;蔡躍波;黃國泓;盧安琪;;礦物摻合料對高性能混凝土的孔結(jié)構(gòu)及抗凍性能的影響[J];工業(yè)建筑;2006年S1期

6 余紅發(fā);孫偉;;混凝土氯離子擴散理論模型[J];東南大學(xué)學(xué)報(自然科學(xué)版);2006年S2期

7 楊錢榮;楊全兵;;摻粉煤灰和引氣劑混凝土的碳化性能研究[J];粉煤灰綜合利用;2006年01期

8 王修田,錢春香,游有鯤,陳春,王瑞興;含氣量對混凝土抗凍性能與抗?jié)B性能的影響[J];混凝土與水泥制品;2004年06期

9 施惠生,王瓊;混凝土中氯離子遷移的影響因素研究[J];建筑材料學(xué)報;2004年03期

10 趙尚傳;氯鹽環(huán)境下非承載力因素對受彎構(gòu)件可靠性的影響[J];公路;2003年09期

，

本文編號：1958502