无砂内疏水透水混凝土的研制与性能研究

发布时间：2018-06-12 09:11

本文选题：无砂透水混凝土 + 荷叶疏水剂　；参考：《北华大学》2017年硕士论文

【摘要】：随着城市化的推进,大面积的不透水性材料被应用于城市的建设,对生态环境造成严重危害。如热岛效应、城市内涝、地下水资源短缺、地面沉降和地表径流污染等。透水混凝土是一种生态型环保混凝土,国外一些发达国家对其研究和应用较早,在市政工程和园林工程中取得了良好的生态效益和社会效益。近年来,我国对透水混凝土的研究与应用势头正热,但是仍处于起步阶段。本文将一种新型建筑涂料改性剂(荷叶疏水剂)引入到透水混凝土的研制之中。研究的主要内容和成果如下:(1)应用体积法进行内疏水透水混凝土配合比设计较为合适。(2)本研究采用经验法与维勃稠度法相结合的方法,能较为准确的对透水混凝土工作性进行评价。(3)添加荷叶疏水剂后,透水混凝土强度有一定提高,最多可提高38%。(4)依据孔隙率、水灰比、疏水剂掺量和骨料类型对透水混凝土的强度和透水系数两方面的影响规律,推荐内疏水透水混凝土的目标孔隙率为20%,水灰比在0.24~0.28之间,荷叶疏水剂掺量为4%,骨料粒径为9.5~11.5mm。(5)制备出了抗压强度为28.7Mpa,透水系数为4.11mm/s,抗折强度为4.47Mpa的内疏水透水混凝土。(6)利用自制的透水仪对透水系数进行了测试,建立了透水系数与有效孔隙率的关系式,并推导出当有效孔隙率大于23.8%后,内疏水透水混凝土的透水系数将超过未添加疏水剂的透水混凝土。(7)内疏水透水混凝土微观结构更加致密,并且具有均匀的蜡质小凸起,形成荷叶疏水效果,与本文理论研究相一致。
[Abstract]:With the development of urbanization, a large area of impermeable materials have been used in urban construction, causing serious harm to the ecological environment. Such as heat island effect, urban waterlogging, groundwater shortage, land subsidence and surface runoff pollution. Permeable concrete is an ecotypic environment-friendly concrete, which has been studied and applied earlier in some developed countries, and has achieved good ecological and social benefits in municipal engineering and garden engineering. In recent years, the research and application of permeable concrete in China is hot, but it is still in its infancy. In this paper, a new architectural coating modifier (lotus leaf hydrophobic agent) is introduced into the development of permeable concrete. The main contents and results of the study are as follows: (1) the volume method is suitable for the design of internal hydrophobic permeable concrete mixture ratio. After adding lotus leaf hydrophobic agent, the strength of permeable concrete can be improved to a certain extent, and the maximum value can be increased by 38. 4) according to porosity and water / cement ratio, The effect of hydrophobic agent content and aggregate type on the strength and permeability coefficient of permeable concrete is studied. It is recommended that the target porosity of internal hydrophobic permeable concrete is 20 and the water-cement ratio is between 0.24 and 0.28. The internal hydrophobic and permeable concrete with a compressive strength of 28.7 Mpas, a permeability coefficient of 4.11mm / s and a flexural strength of 4.47Mpa were prepared. The relationship between the permeability coefficient and the effective porosity is established, and it is deduced that when the effective porosity is greater than 23.8%, The permeability coefficient of internal hydrophobic permeable concrete will be higher than that of impervious concrete without hydrophobic agent. (7) the microstructure of internal hydrophobic permeable concrete will be more compact, and it will have uniform waxy small protrusions to form the hydrophobic effect of lotus leaf. It is consistent with the theoretical study in this paper.
【学位授予单位】：北华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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