【摘要】：隨著人類對(duì)海洋工程的不斷開(kāi)發(fā)與研究,海工混凝土逐漸發(fā)展起來(lái)。由于海工混凝土的應(yīng)用環(huán)境十分惡劣,我國(guó)海洋工程的使用壽命普遍不足30年,混凝土的凍融和侵蝕也就漸漸成了大家的關(guān)注點(diǎn)。因此,如何保證海工混凝土結(jié)構(gòu)具有良好的抗侵蝕性和抗凍性,便成了海洋工程安全性的關(guān)鍵所在。故研究硅灰粉煤灰混凝土的海水侵蝕與凍融性能,對(duì)提高海工混凝土的使用壽命具有重要實(shí)際意義。本文假設(shè)海水環(huán)境下的混凝土結(jié)構(gòu)夏季主要受硫酸鹽侵蝕作用,冬季主要受海水凍融作用。針對(duì)這種假設(shè)對(duì)單摻硅灰混凝土、單摻粉煤灰混凝土、復(fù)摻硅灰粉煤灰混凝土及普通混凝土進(jìn)行了硫酸鹽侵蝕與海水凍融單一作用及硅灰粉煤灰混凝土在兩者先后作用下的劣化模型的研究。針對(duì)硫酸鹽侵蝕試驗(yàn)、海水凍融試驗(yàn)及硫酸鹽侵蝕-海水凍融先后交替試驗(yàn)采用相對(duì)動(dòng)彈性模量、質(zhì)量損失及相對(duì)抗壓強(qiáng)度作為損傷評(píng)價(jià)指標(biāo),對(duì)混凝土的劣化規(guī)律進(jìn)行了分析。作為應(yīng)用基礎(chǔ)研究,本論文的主要結(jié)論可為海洋工程中混凝土耐久性研究設(shè)計(jì)提供試驗(yàn)數(shù)據(jù)和理論參考。本文的研究?jī)?nèi)容主要概述為如下幾方面:首先,對(duì)硅灰粉煤灰混凝土的強(qiáng)度發(fā)展規(guī)律進(jìn)行了試驗(yàn)研究。結(jié)果表明,當(dāng)硅灰摻量5%粉煤灰摻量30%時(shí)硅灰粉煤灰混凝土的抗壓強(qiáng)度達(dá)到最高。其次,對(duì)復(fù)摻最佳摻量硅灰粉煤灰的混凝土(SFAC)、硅灰混凝土(SFC)、粉煤灰混凝土(FAC)、普通混凝土(PC)進(jìn)行了硫酸鹽侵蝕試驗(yàn)研究,以相對(duì)動(dòng)彈性模量、質(zhì)量損失、相對(duì)抗壓強(qiáng)度作為損傷評(píng)價(jià)指標(biāo)對(duì)四種混凝土在硫酸鹽侵蝕試驗(yàn)后的變化規(guī)律進(jìn)行了分析。結(jié)果表明,SFAC抗硫酸鹽侵蝕性能最佳,且其質(zhì)量與強(qiáng)度的變化趨勢(shì)是先提高后下降,相對(duì)動(dòng)彈性模量的變化趨勢(shì)是不斷下降。隨后,對(duì)四種混凝土進(jìn)行了海水凍融試驗(yàn)研究,以外觀損傷、相對(duì)動(dòng)彈性模量、質(zhì)量損失及相對(duì)抗壓強(qiáng)度作為損傷評(píng)價(jià)指標(biāo)對(duì)凍融試驗(yàn)后的劣化規(guī)律進(jìn)行了分析。結(jié)果表明,SFAC抗海水凍融性能同樣是最佳的,并且隨凍融循環(huán)次數(shù)的增加,其外觀損傷越來(lái)越嚴(yán)重,質(zhì)量、相對(duì)動(dòng)彈性模量及強(qiáng)度不斷下降。最后,先將相同作用時(shí)間下硫酸鹽侵蝕與海水凍融分別作用于SFAC后其強(qiáng)度劣化程度進(jìn)行了對(duì)比分析,發(fā)現(xiàn)海水凍融作用下的SFAC的強(qiáng)度劣化程度比硫酸鹽侵蝕作用下的嚴(yán)重。然后對(duì)SFAC進(jìn)行了硫酸鹽侵蝕-海水凍融先后交替試驗(yàn)研究,分析了試件的外觀損傷及質(zhì)量損失、相對(duì)動(dòng)彈性模量、相對(duì)抗壓強(qiáng)度與交替循環(huán)次數(shù)之間的曲線關(guān)系。
[Abstract]:With the continuous development and research of marine engineering, marine concrete is gradually developed. Because the application environment of marine concrete is very bad and the service life of marine engineering in our country is less than 30 years, the freeze-thaw and erosion of concrete has gradually become the focus of attention. Therefore, how to ensure that marine concrete structure has good corrosion resistance and frost resistance becomes the key to the safety of marine engineering. Therefore, it is of great practical significance to study the seawater erosion and freeze-thaw performance of silica fume fly ash concrete in order to improve the service life of marine concrete. In this paper, it is assumed that the concrete structures under seawater environment are mainly affected by sulfate erosion in summer and freeze-thaw by sea water in winter. In view of this assumption, for concrete with single silica fume and fly ash, The single effect of sulfate erosion and sea water freezing and thawing and the deterioration model of silica fume fly ash concrete were studied in this paper. The relative dynamic elastic modulus, mass loss and relative compressive strength were used as the damage evaluation indexes for sulfate erosion test, seawater freeze-thaw test and sulphate-seawater freeze-thaw alternate test. The deterioration law of concrete is analyzed. As an applied basic research, the main conclusions of this paper can provide experimental data and theoretical reference for the research and design of concrete durability in marine engineering. The main contents of this paper are summarized as follows: firstly, the strength development law of silica fume fly ash concrete is studied experimentally. The results show that the compressive strength of silica fume fly ash concrete reaches the highest when the content of silica fume is 5% fly ash and the content of fly ash is 30%. Secondly, the sulphate erosion test of (SFAC), silica fume concrete, (SFC), fly ash concrete, (FAC), ordinary concrete (PC) with the best addition of silica fume fly ash is carried out, and the relative dynamic elastic modulus and mass loss are used. The relative compressive strength is used as the damage evaluation index to analyze the variation of four kinds of concrete after sulfate erosion test. The results show that the resistance of SFAC to sulfate erosion is the best, and the change trend of its quality and strength is first to increase and then to decrease, and the change trend of relative dynamic modulus of elasticity is decreasing. Then, four kinds of concrete were tested by sea water freeze-thaw test, and the damage, relative dynamic modulus of elasticity, mass loss and relative compressive strength were used as the damage evaluation indexes to analyze the deterioration law after freeze-thaw test. The results show that the anti-freezing and thawing performance of SFAC is also the best, and with the increase of freeze-thaw cycle times, the appearance damage becomes more and more serious, the mass, relative dynamic elastic modulus and strength decrease continuously. Finally, the strength deterioration degree of SFAC under the same action time was compared with that of seawater freeze-thaw. It was found that the strength deterioration of SFAC under seawater freezing and thawing was more serious than that under sulfate erosion. Then the SFAC was tested alternately by sulfate erosion and sea water freezing and thawing. The relationship between appearance damage and mass loss, relative dynamic elastic modulus, relative compressive strength and alternating cycle number was analyzed.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528;P75

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張憲堂;高康寧;周紅敏;王洪立;;基于FLUENT的跨海橋梁升阻力與波浪沖擊高度相關(guān)性研究[J];山東科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年04期

2 杜健民;焦瑞敏;姬永生;;氯離子含量對(duì)混凝土硫酸鹽腐蝕程度的影響研究[J];中國(guó)礦業(yè)大學(xué)學(xué)報(bào);2012年06期

3 元成方;牛荻濤;;海洋大氣環(huán)境下粉煤灰混凝土耐久性研究[J];硅酸鹽通報(bào);2012年01期

4 牛荻濤;肖前慧;;混凝土凍融損傷特性分析及壽命預(yù)測(cè)[J];西安建筑科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年03期

5 薛明;劉曉旭;曹黎明;;復(fù)合礦物摻料對(duì)自密實(shí)混凝土耐鹽腐蝕性能影響的研究[J];粉煤灰;2008年02期

6 楊全兵;朱蓓蓉;;混凝土鹽結(jié)晶破壞的研究[J];建筑材料學(xué)報(bào);2007年04期

7 梁詠寧;袁迎曙;;硫酸鈉和硫酸鎂溶液中混凝土腐蝕破壞的機(jī)理[J];硅酸鹽學(xué)報(bào);2007年04期

8 高禮雄;榮輝;劉金革;;鋇鹽對(duì)混凝土抗硫酸鹽侵蝕的有效性研究[J];混凝土;2007年03期

9 楊全兵;NaCl溶液結(jié)冰壓的影響因素研究[J];建筑材料學(xué)報(bào);2005年05期

10 ;我國(guó)混凝土壩工程和水工混凝土耐久性研究的新進(jìn)展——訪中國(guó)水利水電科學(xué)研究院教授高工、中國(guó)土木工程學(xué)會(huì)混凝土與預(yù)應(yīng)力混凝土分會(huì)混凝土耐久性專委會(huì)主任李金玉[J];商品混凝土;2005年02期

相關(guān)會(huì)議論文 前2條

1 林寶玉;蔡躍波;單國(guó)良;;保證和提高我國(guó)港工混凝土耐久性措施的研究與實(shí)踐[A];吳中偉院士從事科教工作六十年學(xué)術(shù)討論會(huì)論文集[C];2004年

2 肖海英;葛勇;張寶生;袁杰;季洪雷;;浸泡方式對(duì)混凝土腐蝕性的研究[A];沿海地區(qū)混凝土結(jié)構(gòu)耐久性及其設(shè)計(jì)方法科技論壇與全國(guó)第六屆混凝土耐久性學(xué)術(shù)交流會(huì)論文集[C];2004年

相關(guān)博士學(xué)位論文 前2條

1 馬昆林;混凝土鹽結(jié)晶侵蝕機(jī)理與評(píng)價(jià)方法[D];中南大學(xué);2009年

2 金祖權(quán);西部地區(qū)嚴(yán)酷環(huán)境下混凝土的耐久性與壽命預(yù)測(cè)[D];東南大學(xué);2006年

相關(guān)碩士學(xué)位論文 前3條

1 羅文軍;混凝土結(jié)構(gòu)硫酸鹽侵蝕病害的水泥基修補(bǔ)材料研究[D];中南大學(xué);2011年

2 趙煒璇;凍融環(huán)境下混凝土結(jié)構(gòu)溫度場(chǎng)及溫度應(yīng)力分析研究[D];哈爾濱工業(yè)大學(xué);2006年

3 師金鋒;納米硅灰復(fù)合粉體超高強(qiáng)水泥基材料試驗(yàn)研究[D];西北工業(yè)大學(xué);2005年

，

本文編號(hào)：2297887