生态多孔混凝土植物相容性研究

发布时间：2018-01-04 00:34

  本文关键词：生态多孔混凝土植物相容性研究　出处：《中南林业科技大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 生态多孔混凝土 化学相容性 物理相容性 生物学特性

【摘要】：生态多孔混凝土(简称EPC)是由单一粒级的粗骨料、水、水泥等经适当的搅拌工艺和振捣而成型的一种新型混凝土结构材料。由于其特殊的骨架结构且有效孔隙率可达30%左右,通过向其孔隙中填充泥土、营养物质、保水材料等能够满足植物生长需求,可将其应用于停车场、路边护坡、路肩隔板等工程中并具有保持水分、吸音降噪、缓解城市热岛效应和改善生态环境等优势,EPC现已成为国内外学者研究的热点领域之一。基于EPC存在碱度高、强度低、连通孔隙率低、孔结构分布不均匀等特性,从植被物种筛选与培育角度出发,深入探讨EPC与植被品种的相容性及其在EPC中的生长特性,是绿色生态混凝土制备技术的瓶颈,也是制约其能否推广应用的关键,因此开展EPC植物相容性及植物在EPC中的生物学特性研究意义重大。本文的主要研究结论如下:(1)借鉴普通混凝土配合比设计原则,提出了基于体积法和比表面积法两种可行的生态多孔混凝土配合比设计方法,并通过试验予以验证其正确性。(2)基于对生态多孔混凝土不同碱环境下的狗牙根、高羊茅、黑麦草、早熟禾的发芽率、形态特性和生长量等生长特性规律的研究,探明了狗牙根、高羊茅、黑麦草、早熟禾四种植被与生态多孔混凝土化学相容性的碱度临界条件,为不同碱性环境条件下优选不同植被品种提供了可靠的理论依据。(3)探讨了耕植土、有机肥、外加剂、珍珠岩、水等主要影响因素对生态多孔混凝土植物生长特性的影响程度,研究结果表明:有机肥和耕植土是影响植物萌发的主要因素。同时,得出了四个草种最适应种植材料(耕植土:有机肥:外加剂:珍珠岩:水)的最优组合配比狗牙根(36%:11%:8%:14%:32%)、高羊茅(41%:9.8%:7%:12%:30%)、早熟禾(46%:6%:7%:12%:28%.)、黑麦草(45%:9%:6%:11%:28%),最优组合下草种的生长质量与普通土壤基本相当。(4)探讨了狗牙根、高羊茅、黑麦草、早熟禾四种植被与生态多孔混凝土的物理相容性,生态多孔混凝土中土壤含水量为50～60%左右时,四种草种的生长状况均受到不同的影响。其中,狗牙根、早熟禾在生态多孔混凝土中土壤含水量为50～60%左右时仍能较正常生长,表现出优异的耐旱能力;黑麦草抗旱能力差,其生长严重受到土壤含水量制约;高羊茅的生理指标状况随土壤含水量的变化而变化,比较适应于湿润的土壤环境。而早熟禾在土壤含水量为70～80%左右时生长状况受到显著影响,说明其耐湿能力较差。上述研究结论为在EPC内培育不同植被品种调制土壤含水量提供了可靠的参考依据。(5)建立了植物品种与生态多孔混凝土结构一一对应法则,并通过中试平台进行了验证,可为生态多孔混凝土工程应用提供了技术指导。
[Abstract]:Ecological porous concrete (EPC) is composed of coarse aggregate, single grade water cement by ramming stirring process and appropriate vibration as a new type of concrete structural material. Because of its special framework and effective porosity can reach about 30%, through to the pore filling soil, nutrients, Paul water material can meet the demand of plant growth, which can be applied to the parking lot, roadside slope, shoulder plate engineering with water retention, noise reduction, ease of urban heat island effect and improve the ecological environment and other advantages, EPC has become one of the hot areas of research at home and abroad. Based on EPC has high alkalinity, low intensity, connectivity low porosity, pore structure and uneven distribution characteristics, vegetation species selection and cultivation from the perspective of in-depth study of the compatibility and growth in EPC of EPC and vegetation species, green ecological concrete The bottleneck of concrete preparation technology, the key is to restrict its application can be extended, so to carry out the study on the biological characteristics of EPC plant compatibility significance and plant in EPC major. The main conclusions are as follows: (1) using the mix design principle of ordinary concrete, the mix design method based on volume method and ecological the porous surface area method of two kinds of feasible concrete, and through the test to verify its correctness. (2) on the ecological environment of the porous concrete with different alkali bermudagrass, based on germination rate of ryegrass, tall fescue, bluegrass, growth characteristics of morphological characteristics and growth regularity of proven bermudagrass tall fescue, ryegrass and bluegrass four vegetation ecological and chemical compatibility of porous concrete critical condition of basicity, provide a reliable theoretical basis for different varieties and different vegetation under the alkaline conditions (3) on the selection. 璁ㄤ簡鑰曟�嶅湥�

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