【摘要】：粉煤灰作為發(fā)電廠的副產(chǎn)品一直污染著地球的環(huán)境,隨著對粉煤灰的認識逐漸加深,人們將其運用到廣闊的工程領(lǐng)域中,尤其是運用到混凝土工程之中。由于性能的優(yōu)異性,混凝土是目前世界上運用最廣泛的人工建筑材料,它的年產(chǎn)量(2012)現(xiàn)在已達到2億噸,因此合理地開發(fā)和運用粉煤灰混凝土對于開發(fā)綠色建筑材料有著重要的意義。雖然目前對于粉煤灰混凝土的研究已經(jīng)有了一定進展,但是對于高摻量粉煤灰混凝土的研究還有一定欠缺。對于一般粉煤灰混凝土而言,粉煤灰摻量為15%到20%之間,而高摻量粉煤灰混凝土的粉煤灰摻量也大都在50%左右,本文則圍繞粉煤灰摻量為70%~90%的超高摻量粉煤灰混凝土展開研究。根據(jù)大連理工大學王立久教授提出的膠凝系數(shù)的概念,認為膠凝系數(shù)β是與粉煤灰細度、需水量和燒失量相關(guān)的變量,通過實驗確定超高摻量粉煤灰混凝土的膠凝系數(shù)β的公式。從膠凝系數(shù)的角度,認為粉煤灰是超高摻量粉煤灰混凝土的單獨組分,確定了與超高摻量粉煤灰混凝土配合比設計相關(guān)的三個參數(shù):單位用水量、灰膠比、水膠比,以此為根據(jù)建立了超高摻量粉煤灰混凝土的配合比計算模型,根據(jù)大量的實驗數(shù)據(jù)歸納了超高摻量粉煤灰混凝土的配合比設計步驟。最后,本文通過大量實驗數(shù)據(jù)分析了粉煤灰的摻量、水膠比、粉煤灰激發(fā)劑的品種和養(yǎng)護齡期對其強度的影響,研究表明超高摻量粉煤灰混凝土的抗壓強度會隨著粉煤灰摻量的增加、水膠比的降低而降低,而且在標準條件下養(yǎng)護28d后抗壓強度仍有所提高。針對粉煤灰自身的物理化學性質(zhì),在超高摻量粉煤灰混凝土中摻入一定的激發(fā)劑也可以相應提高其抗壓強度。
[Abstract]:Fly ash, as a by-product of power plant, has been polluting the environment of the earth. With the deepening of the understanding of fly ash, people apply it to a wide range of engineering fields, especially to concrete engineering. Because of its excellent performance, concrete is currently the most widely used artificial building material in the world. Its annual output (2012) has now reached 200 million tons. Therefore, the reasonable development and application of fly ash concrete is of great significance to the development of green building materials. Although there has been some progress in the research of fly ash concrete, the research of high content fly ash concrete is still lacking. For the general fly ash concrete, the fly ash content is between 15% and 20%, and the fly ash content of the high content fly ash concrete is about 50%. In this paper, the fly ash concrete with 70% fly ash and 90% fly ash is studied. According to the concept of cementitious coefficient put forward by Professor Wang Lijiu of Dalian University of Technology, the cementitious coefficient 尾 is a variable related to the fineness of fly ash, water demand and burning loss. The formula of cementitious coefficient 尾 of super high content fly ash concrete is determined by experiment. From the point of view of cementitious coefficient, fly ash is considered as a separate component of ultra-high content fly ash concrete, and three parameters related to the mix design of ultra-high content fly ash concrete are determined: unit water consumption, ratio of cement to cement, ratio of water to binder, ratio of water to binder, Based on this model, the calculation model of mix ratio of ultra-high content fly ash concrete is established, and the design steps of mix ratio of super high content fly ash concrete are summarized according to a large number of experimental data. Finally, the influence of fly ash content, water-binder ratio, type of fly ash activator and curing age on its strength is analyzed through a large number of experimental data. The results show that the compressive strength of super-high content fly ash concrete will decrease with the increase of fly ash content and the decrease of water-binder ratio, and the compressive strength will still increase after 28 days of curing under standard conditions. According to the physical and chemical properties of fly ash itself, the compressive strength can be improved by adding certain activator in ultra-high content fly ash concrete.
【學位授予單位】：武漢輕工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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