本文選題：路面修補(bǔ) + 硅酸鹽水泥��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)的不斷發(fā)展,當(dāng)前我國公路總里程和高速公路里程均達(dá)到世界首位,公路交通承擔(dān)78.2%的貨運(yùn)量和93.5%的客運(yùn)量,可見公路對支撐我國經(jīng)濟(jì)的發(fā)展發(fā)揮著巨大作用。而交通壓力的增大使水泥混凝土路面出現(xiàn)大量損壞,僅車輛超載造成的公路損失每年超過300億元,路面一旦損壞必須進(jìn)行快速修補(bǔ)從而盡快開放交通,減少經(jīng)濟(jì)損失。本文針對目前對路面修補(bǔ)材料的要求,結(jié)合超早強(qiáng)修補(bǔ)材料的制備現(xiàn)狀,通過使用產(chǎn)量大、易獲取的硅酸鹽水泥,結(jié)合自主研制的無堿、無氯的新型復(fù)合超早強(qiáng)劑,制備了具有超早強(qiáng)性能、施工性能良好的修補(bǔ)混凝土。得出的結(jié)論如下：1)復(fù)合超早強(qiáng)劑的設(shè)計與制備：通過組分單獨(dú)作用時抗壓強(qiáng)度、凝結(jié)時間的試驗(yàn)結(jié)果,結(jié)合早強(qiáng)、速凝的機(jī)理,對超早強(qiáng)劑中速凝組分和早強(qiáng)組分進(jìn)行優(yōu)化選擇,提出了超早強(qiáng)劑組分配制方法,選擇硫酸鹽、甲酸鹽和硝酸鹽作為超早強(qiáng)劑的配制組分。繼而進(jìn)行組分間的正交試驗(yàn),研制出適用于硅酸鹽水泥混凝土的無堿、無氯超早強(qiáng)劑,其組分間的摻量為：硫酸鹽1.6%,甲酸鹽2.0%,硝酸鹽1.0%,進(jìn)一步的研究選擇聚羧酸高性能減水劑作為復(fù)配的減水組分。2)超早強(qiáng)混凝土配制及基本性能：為研究制備出的超早強(qiáng)劑作用效果,將超早強(qiáng)劑應(yīng)用到混凝土中,系統(tǒng)研究了超早強(qiáng)劑摻量為1%、2%和3%時混凝土的物理力學(xué)性能,包括混凝土不同齡期抗壓強(qiáng)度、凝結(jié)時間、坍落度及其經(jīng)時損失,根據(jù)試驗(yàn)結(jié)果分析后確定超早強(qiáng)劑的最佳摻量為2%,同時復(fù)配的減水組分摻量為1.2%，，在對混凝土的配合比進(jìn)行調(diào)整后,系統(tǒng)研究了摻復(fù)合超早強(qiáng)劑混凝土的物理力學(xué)性能,結(jié)果發(fā)現(xiàn)混凝土在初始坍落度為80mm的情況下,60min的坍損小于35%,滿足1小時施工要求；混凝土16h抗壓強(qiáng)度達(dá)到20MPa,完全滿足道路快速修補(bǔ)后開放交通的要求。3)超早強(qiáng)劑作用機(jī)理及結(jié)構(gòu)形成過程：基于掃描電子顯微鏡(SEM)、X射線衍射儀(XRD)和水化熱試驗(yàn),系統(tǒng)研究了超早強(qiáng)劑各組分單獨(dú)作用及超早強(qiáng)劑作用下的微觀形貌、物相組成及水化過程,分析各組分及超早強(qiáng)劑的作用機(jī)理,并與宏觀試驗(yàn)結(jié)果相驗(yàn)證,為超早強(qiáng)劑的應(yīng)用奠定科學(xué)的理論基礎(chǔ)。結(jié)果發(fā)現(xiàn)超早強(qiáng)劑的作用機(jī)理表現(xiàn)為各組分間的協(xié)同互補(bǔ)作用,即在早期形成鈣礬石的骨架結(jié)構(gòu)同時,產(chǎn)生大量的C-S-H凝膠,相互膠結(jié)在一起促進(jìn)體系的凝結(jié)硬化：超早強(qiáng)劑作用下的后期水化熱較低,有利于實(shí)際應(yīng)用過程中混凝土耐久性的發(fā)展。
[Abstract]:With the development of our country's economy, the total mileage of highway and the mileage of highway reach the first place in the world at present. The highway traffic undertakes 78.2% of the freight and 93.5% of the passenger traffic. It can be seen that the highway plays a great role in supporting the development of our country's economy. However, the increase of traffic pressure causes a lot of damage to cement concrete pavement, only the highway loss caused by vehicle overload exceeds 30 billion yuan per year. Once the road is damaged, it must be repaired quickly so as to open up traffic as soon as possible and reduce the economic loss. In this paper, according to the requirement of pavement repair material at present, combined with the present situation of preparation of super early strength repair material, through the use of Portland cement, which is high yield and easy to obtain, combined with a new type of compound super early strength agent without alkali and chlorine developed by ourselves, Repair concrete with super early strength and good construction performance was prepared. The conclusions are as follows: (1) the design and preparation of the composite superearly strength agent: through the experimental results of compressive strength and setting time of components acting alone, combined with the mechanism of early strength and rapid setting, The formulation method of super early strength agent component was put forward. Sulfate, formate and nitrate were selected as the composition of super early strength agent. Then the orthogonal test between the components was carried out, and a super early strength agent without alkali and chlorine was developed for Portland cement concrete. The contents of its components are as follows: sulphate 1.6, formate 2.0, nitrate 1.0. Further study and selection of polycarboxylic acid high performance water reducing agent as water reducing component .2) preparation and basic properties of super early strength concrete: for the study of the super strength concrete prepared The effect of early strength agent, The physical and mechanical properties of concrete with 1% and 3% super early strength agent were systematically studied, including compressive strength, setting time, slump and its time loss at different ages. According to the analysis of the test results, it is determined that the optimum dosage of super early strength agent is 2 and the addition of water reducing component is 1.2. After adjusting the mix ratio of concrete, the physical and mechanical properties of concrete with composite super early strength agent are systematically studied. The results show that when the initial slump is 80mm, the concrete collapse is less than 35 minutes, which meets the requirement of 1 hour construction. The compressive strength of concrete reaches 20MPa in 16h, which fully meets the requirements of open traffic after rapid road repair. 3) the mechanism and structure formation process of super early strength agent: based on scanning electron microscope (SEM) X-ray diffraction (XRD) and hydration heat test, The micromorphology, phase composition and hydration process of each component of super early strength agent were systematically studied, and the mechanism of each component and super early strength agent was analyzed, and the results were verified by macroscopic test. It lays a scientific theoretical foundation for the application of super early strength agent. The results showed that the mechanism of ultra early strength agent was the synergistic and complementary action of each component, that is to say, a large number of C-S-H gels were produced at the same time when the framework structure of ettringite was formed in the early stage. Mutual cementation promotes the condensation and hardening of the system: the later hydration heat under the action of super early strength agent is lower, which is beneficial to the development of concrete durability in practical application.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

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