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生态混凝土低碱度胶凝材料研究(刘正龙)

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【作者】刘正龙 【导师】陆采荣
'X-r#k[ x[{0e0【作者基本信息】南京水利科学研究院,材料学,2004年,硕士水利论文.e+F5X iJ8p t V-\'iX

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【中文摘要】 本文紧密结合水利部“948”计划技术创新与转化项目“岩石陡坡生态保护系统工程技术研究”,围绕陡坡生态护坡胶凝材料硬化浆体既要适当的强度,满足护坡需要,又要较低的液相碱度,以适应植物生长的要求,进行了室内研究。 目前硅酸盐水泥、铝酸盐水泥、硫铝酸盐水泥等三大系列水泥的理论分析表明:硫铝酸盐水泥系列水化产物平衡时的液相碱度是最低的,且经过改性还可以进一步改善其强度和碱度等综合性能。 综合胶凝材料硬化浆体的强度及其液相碱度,初步选定H30—1和H50—6作为生物基层的胶凝材料。试验室条件下,它们硬化浆体液相碱度对土壤液相碱度的影响和多孔混凝土抗压强度等试验表明:低碱度胶凝材料H50—6的碱度较硅酸盐水泥降低约20%,5小时龄期,其硬化浆体液相碱度仅使土壤液相碱度上升7%,且在7天龄期,土壤液相碱度基本维持在其试验前的水平,同时还说明,所设计的试验方法、分层取土器对土壤液相碱度的分析是有效的;H50—6与人工骨料拌制充填率为40%的多孔混凝土,龄期90天的立方体抗压强度达10.4MPa,但由H30—1拌制的多孔混凝土龄期90天时,强度出现倒缩;植物适应性试验以绿景天植物正常生长证明了H50—6...更多作为生物基层的胶凝材料是可行的。 SEM等微观测试表明,H50—6硬化浆体前期的强度主要来源于它的水化产物钙矾石,后期主要是石膏、矿渣、粉煤灰的水化,生成较多的凝胶物质,并包裹在钙矾石的表面。这样,凝胶物质一方面使硬化浆体的强度缓慢增加,另一方面阻缓了大气对钙矾石的侵蚀,有效抑制了由于钙矾石的分解而导致硬化浆体的强度倒缩。  还原水利论文 c&A8_Rn'zF

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【英文摘要】 This research programe is a part of the Ministry of Water Resources' 948 Plan, namely technical innovation and transformation projects, study on techniques of steep rock slope eco-engineering. The dissertation presents laboratory test that hardened cementitious paste has not only moderate strength to protect steep slope, but also low pH value suitable for plant growth.Theoretical analysis on three series of cements, i. e. Portland cement, high alumina cement and sulpho-aluminous cement, shows that alkalinity of the pore fluid of the balanced hydration product of sulpho-aluminous cement is the lowest, and its strength and alkalinity can be adjusted further by the adjustment of its components.With integration of the requirements of strength of hardened cement paste and alkalinity of its pore fluid, two formulas, H30-1 and H50-6, are primarily selected for biobed materials. Experimentations of the effect of alkalinity of the pore fluid of hardened paste on soil alkalinity and compressive ...更多strength of the porous concrete show that the pH value of H50-6 Formula decreases by 20% with comparison to that of Portland cement, alkalinity of soil pore fluid is only increased by 7% at 5 hours, and is stabilized at 7 days. At the same time, it reflects the designed test method and layered soil sampler are effective to the analysis of alkalinity of soil pore fluid. At 90 days, cubic compressive strength of the porous concrete of H50-6 Formula reaches 10.4 MPa with filling rate of 40% and artificial aggregates, while that of H30-1 Formula decreases. Test results of plantadaptability shows that cementitious materials of H50-6 Formula is suitable for biobed by the normal growth of green stonecrop.SEM micro-tests reveals that the antecedent strength of hardened paste of H50-6 Formula originates from ettringite, a hydration product. Later on, hydration of fly ash, slag and gypsum produces gel material enwrapping the surface of ettringite, which increases the strength of H50-6's hardened paste on the one hand, and hold back ettringite weathering on the other hand. So ettringite decomposition is effectively controlled so as to avoid strength decrease of the hardened paste.  还原水利论文(_\3J r? Q6d

_D"j1b R0【中文关键词】 生态混凝土; 胶凝材料; 砂浆; 碱度; 分层取土器; 水化机理
hXX/x4?1Y0npE0【英文关键词】 environmentally friendly concrete; cementitious materials; mortar; alkalinity; layered soil sampler; hydration mechanism水利论文#B*^.n/@7o*sk+]T

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TAG: 混凝土 生态 刘正龙 碱度 胶凝材料
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