植生型多孔混凝土试验及在小河流中的应用

发布时间：2019-05-31 21:10

【摘要】：随着我国经济的发展，环境问题日益凸显，如何平衡发展与生态之间的关系，走可持续发展的道路是人们亟待解决的问题。在水利工程建设中，过去只注重防洪，安全，经济等工程效益，一些传统护岸工程打破了河流原有的生态体系，由于其使用的一些硬质材料阻断了水生生态环境与陆生生态环境之间的联系，导致河流失去其作为生态廊道的作用，，不利于生态保护和水土保持。近年来随着生态水利的提倡，对于护坡建设不再如以往只注重防洪、防冲等基本的工程性能，还要求其兼顾生态的保护，这类护坡即为新型生态护坡。植生型多孔混凝土是一种生态型护坡材料，不但具有一定的强度，能满足护坡防洪防冲的需求，还能提供动植物生长的空间，并能实现岸水之间的亲水交换，具备一定净化水质的功能，具有良好的生态效益。本文根据省内具体情况，提出应用于小河流治理中的植生型多孔混凝土应满足的技术指标。使用体积法以孔隙率为目标值对多孔混凝土配合比进行设计，并制备试块测量数据验证该方法的可行性，结果证明工程中体积法可用于配合比的设计。通过对不同配合比试块进行试验分析，研究各因素对植生型多孔混凝土孔隙率、强度、孔隙环境pH值的影响性。其中，多孔混凝土组成成分中，胶凝浆体与其孔隙率呈负相关关系，两者呈良好的线性关系，其中胶凝浆体掺量每增加50kg/m3，孔隙率下降2.4%。骨料粒径和液灰比与孔隙率呈正相关关系，但影响幅度小，有效孔隙率主要受全孔隙率控制，两者呈良好2次函数关系。多孔混凝土强度主要受其目标孔隙率影响，孔隙率越大，强度越小。多孔混凝土中孔隙环境pH值主要受水泥掺量控制，两者呈良好线性关系，通过对所设计的多孔混凝土pH值的期望范围，可以确定其水泥用量的大致范围，联系体积法可用于植生型多孔混凝土配合比的设计中。参考总结前人关于护坡植草的工艺，探讨合适于小河流治理中植生型多孔混凝土护坡的植草工艺。设计不同配合比铺浇多孔混凝土试验坡，通过对植物的种植观察，孔隙孔径增大对植物的生长有积极作用，并且试验证明，植物能够在植生型多孔混凝土护坡上良好的生长。
[Abstract]:With the development of economy in our country, the environmental problems are becoming more and more prominent. How to balance the relationship between development and ecology and take the road of sustainable development is an urgent problem to be solved. In the construction of water conservancy projects, only attention was paid to flood control, safety, economy and other engineering benefits in the past, and some traditional bank protection projects broke the original ecological system of the river. Because some hard materials used in it block the relationship between aquatic ecological environment and terrestrial ecological environment, the river loses its role as an ecological corridor, which is not conducive to ecological protection and soil and water conservation. In recent years, with the promotion of ecological water conservancy, slope protection construction no longer only pays attention to flood control, scour prevention and other basic engineering performance, but also requires it to take into account ecological protection, this kind of slope protection is a new type of ecological slope protection. Vegetation porous concrete is a kind of ecological slope protection material, which not only has certain strength, can meet the needs of slope protection, flood control and scour prevention, but also provides space for the growth of animals and plants, and can realize the hydrophilic exchange between shore water. It has the function of purifying water quality and has good ecological benefit. According to the specific situation in the province, this paper puts forward the technical indexes that should be satisfied in the treatment of small rivers. The volume method is used to design the mixture proportion of porous concrete with porosity as the target value, and the measurement data of test blocks are prepared to verify the feasibility of the method. The results show that the volume method can be used in the design of mix proportion in engineering. Based on the experimental analysis of different mix ratios, the effects of various factors on the porosity, strength and pH value of porous concrete were studied. Among the components of porous concrete, there is a negative correlation between cementitious slurry and its porosity, and there is a good linear relationship between them, in which the porosity decreases by 2.4% when the content of cementitious concrete increases by 50 kg / m ~ 3. There is a positive correlation between aggregate particle size and liquid-cement ratio and porosity, but the influence amplitude is small, and the effective porosity is mainly controlled by the whole porosity, which shows a good quadratic function relationship. The strength of porous concrete is mainly affected by its target porosity, and the greater the porosity, the smaller the strength. The pH value of pore environment in porous concrete is mainly controlled by cement content, and there is a good linear relationship between them. Through the expected range of pH value of porous concrete, the approximate range of cement content can be determined. The contact volume method can be used in the design of the mix proportion of planting porous concrete. Referring to the previous technology of slope protection and grass planting, this paper discusses the grass planting technology suitable for planting porous concrete slope protection in small river control. The experimental slope of porous concrete with different mix proportion is designed. Through the observation of plant planting, the increase of pore size has a positive effect on the growth of plant, and the experimental results show that the plant can grow well on the slope protection of plant-type porous concrete.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV85;TV431

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