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  本文選題：快硬泡沫混凝土 + 硅-鋁復合膠凝材料　； 參考：《南京航空航天大學》2014年碩士論文

【摘要】：快硬泡沫混凝土作為路用輕質填筑材料可以大大提高施工效率和質量,在快速搶修和防護領域具有較大的應用價值。論文基于硅-鋁復合膠凝材料,研究了快硬防護型泡沫混凝土的制備和性能,推導及模擬了基體與現(xiàn)澆泡沫混凝土強度的比值,主要研究內容和結果如下:(1)設計三種制備工藝,其中發(fā)泡、螺旋和強制工藝不僅避免了干料附著,而且制備速度快,漿體均勻,清洗方便,成品性能穩(wěn)定。(2)試驗研究發(fā)現(xiàn),A泡沫與脂肪族和聚羧酸減水劑不能共存,而與萘系適應性很好;當水泥漿體流動性增大且粘度減小或泡沫用量增加時,損泡率降低;當泡沫用量增大或減水劑減少時,平均孔徑增大。(3)試驗表明了泡沫穩(wěn)定性及漿體流動性的重要性,將泡沫混凝土的初凝時間表征為其失去泡沫穩(wěn)定性和自流平流動度的時間,泡沫混凝土的終凝時間表征為泡沫混凝土達到滿足其再澆筑高度強度的時間。(4)研究表明AC摻量50%時,硅-鋁復合膠凝材料凝結時間最短,強度適中,且不會倒縮;使用萘系減水劑、粉煤灰、礦粉、硅灰和早強劑等進行配比優(yōu)化,對初凝時間和28d強度的最優(yōu)組合分別為10%、10%、0、0、2%和10%、20%、9%、0.6%、2%;泡沫用量確定后,泡沫混凝土與水泥漿體的流動度呈線性關系。(5)理論推導泡沫混凝土容重和高度與其面密度的關系,面密度近似等于面層所受壓力與大氣壓的比值乘以容重。(6)通過理論推導及有限元模擬,計算基體與泡沫混凝土強度的比值,分別為6.5和6.4。試驗結果大多在7~13間,快硬泡沫混凝土可優(yōu)化內部孔隙,降低比值。
[Abstract]:As a lightweight filling material for road, fast hard foam concrete can greatly improve the construction efficiency and quality, and has great application value in the field of rapid repair and protection. Based on the silicon-aluminum composite cementitious material, the preparation and performance of fast hardening protective foamed concrete are studied in this paper. The ratio of matrix and cast-in-place foam concrete strength is deduced and simulated. The main research contents and results are as follows: (1) three kinds of preparation techniques are designed. The foaming, screw and forced process not only avoid the adhesion of dry materials, but also have the advantages of fast preparation, uniform slurry, easy cleaning and stable performance. (2) the experimental results show that the foam can not coexist with aliphatic and polycarboxylic acid superplasticizer. When the fluidity of cement paste increases and the viscosity decreases or the amount of foam increases, the loss rate of foam decreases, and when the amount of foam increases or the amount of water reducer decreases, (3) the experiment shows the importance of foam stability and slurry fluidity. The initial setting time of foam concrete is characterized as the time when it loses foam stability and self-leveling fluidity. The final setting time of foamed concrete is expressed as the time when the foam concrete reaches the high strength of repouring. (4) the results show that the setting time of silicon-aluminum composite cementing material is the shortest, the strength is moderate, and it will not be collapsed when AC is 50%. The ratio of naphthalene series water reducer, fly ash, mineral powder, silica fume and early strength agent is optimized. The optimum combination of initial setting time and 28d strength is 1010% and 10% respectively. After the amount of foam is determined, There is a linear relationship between the fluidity of foam concrete and cement paste. (5) the relationship between bulk density and height of foam concrete and its surface density is deduced theoretically. The surface density is approximately equal to the ratio of the pressure to the atmospheric pressure of the surface layer multiplied by the bulk density. (6) by theoretical derivation and finite element simulation, the ratio of the strength of the matrix to the foam concrete is calculated, which is 6.5 and 6.4, respectively. The experimental results are mostly between 7 and 13, and the quick hard foamed concrete can optimize the internal porosity and reduce the ratio.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528.2

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