【摘要】：隨著人類對海洋工程的不斷開發(fā)與研究,海工混凝土逐漸發(fā)展起來。由于海工混凝土的應(yīng)用環(huán)境十分惡劣,我國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。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,對提高海工混凝土的使用壽命具有重要實際意義。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。針對這種假設(shè)對單摻硅灰混凝土、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。針對硫酸鹽侵蝕試驗、海水凍融試驗及硫酸鹽侵蝕-海水凍融先后交替試驗采用相對動彈性模量、質(zhì)量損失及相對抗壓強度作為損傷評價指標(biāo),對混凝土的劣化規(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)計提供試驗數(shù)據(jù)和理論參考。本文的研究內(nèi)容主要概述為如下幾方面:首先,對硅灰粉煤灰混凝土的強度發(fā)展規(guī)律進(jìn)行了試驗研究。結(jié)果表明,當(dāng)硅灰摻量5%粉煤灰摻量30%時硅灰粉煤灰混凝土的抗壓強度達(dá)到最高。其次,對復(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研究,以相對動彈性模量、質(zhì)量損失、相對抗壓強度作為損傷評價指標(biāo)對四種混凝土在硫酸鹽侵蝕試驗后的變化規(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)量與強度的變化趨勢是先提高后下降,相對動彈性模量的變化趨勢是不斷下降。隨后,對四種混凝土進(jìn)行了海水凍融試驗研究,以外觀損傷、相對動彈性模量、質(zhì)量損失及相對抗壓強度作為損傷評價指標(biāo)對凍融試驗后的劣化規(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,其外觀損傷越來越嚴(yán)重,質(zhì)量、相對動彈性模量及強度不斷下降。最后,先將相同作用時間下硫酸鹽侵蝕與海水凍融分別作用于SFAC后其強度劣化程度進(jìn)行了對比分析,發(fā)現(xiàn)海水凍融作用下的SFAC的強度劣化程度比硫酸鹽侵蝕作用下的嚴(yán)重。然后對SFAC進(jìn)行了硫酸鹽侵蝕-海水凍融先后交替試驗研究,分析了試件的外觀損傷及質(zhì)量損失、相對動彈性模量、相對抗壓強度與交替循環(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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528;P75

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本文編號：2297887