快硬防护型泡沫混凝土的制备与性能研究

发布时间：2018-07-02 15:26

本文选题：快硬泡沫混凝土 + 硅-铝复合胶凝材料　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：快硬泡沫混凝土作为路用轻质填筑材料可以大大提高施工效率和质量,在快速抢修和防护领域具有较大的应用价值。论文基于硅-铝复合胶凝材料,研究了快硬防护型泡沫混凝土的制备和性能,推导及模拟了基体与现浇泡沫混凝土强度的比值,主要研究内容和结果如下:(1)设计三种制备工艺,其中发泡、螺旋和强制工艺不仅避免了干料附着,而且制备速度快,浆体均匀,清洗方便,成品性能稳定。(2)试验研究发现,A泡沫与脂肪族和聚羧酸减水剂不能共存,而与萘系适应性很好;当水泥浆体流动性增大且粘度减小或泡沫用量增加时,损泡率降低;当泡沫用量增大或减水剂减少时,平均孔径增大。(3)试验表明了泡沫稳定性及浆体流动性的重要性,将泡沫混凝土的初凝时间表征为其失去泡沫稳定性和自流平流动度的时间,泡沫混凝土的终凝时间表征为泡沫混凝土达到满足其再浇筑高度强度的时间。(4)研究表明AC掺量50%时,硅-铝复合胶凝材料凝结时间最短,强度适中,且不会倒缩;使用萘系减水剂、粉煤灰、矿粉、硅灰和早强剂等进行配比优化,对初凝时间和28d强度的最优组合分别为10%、10%、0、0、2%和10%、20%、9%、0.6%、2%;泡沫用量确定后,泡沫混凝土与水泥浆体的流动度呈线性关系。(5)理论推导泡沫混凝土容重和高度与其面密度的关系,面密度近似等于面层所受压力与大气压的比值乘以容重。(6)通过理论推导及有限元模拟,计算基体与泡沫混凝土强度的比值,分别为6.5和6.4。试验结果大多在7~13间,快硬泡沫混凝土可优化内部孔隙,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.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528.2

【参考文献】