碱渣土路用性能研究与微观结构分析

发布时间：2018-04-13 11:26

本文选题：碱渣 + 液塑限　；参考：《河北工业大学》2015年硕士论文

【摘要】：碱渣是氨碱法生产纯碱过程中产生的工业废弃物,严重制约经济发展,危害环境。为了对碱渣进行综合利用,本文将碱渣与粉煤灰按相应比例拌合形成碱渣土,探讨路堤填垫的可行性。通过室内试验,文章对碱渣土的物理指标,力学指标和微观结构进行了检测分析。主要研究成果如下:(1)通过室内试验,文章对碱渣土的物理指标进行了检测,分别从界限含水率,颗分,击实三方面讨论了不同配比情况下碱渣土的相关性质。选出了路堤填垫中的碱渣土的最佳配比,即碱渣与粉煤灰的比例为4:1。(2)通过室内试验,本文进一步对碱渣土的力学性能做了研究。对碱渣土的抗压强度,剪切强度进行了测定。为了进一步提高力学性能,在碱渣土中加入胶凝材料,碱渣土力学性能提升明显。胶凝材料含量为碱渣土5%时经济适用。对碱渣土的承载力指标,回弹模量和加州承载比进行试验,结果符合国家高速公路规范。验证了碱渣土用于高速公路路堤的可行性(3)借助高倍显微镜对碱渣土微观结构进行观察,随着元明粉含量升高,碱渣土颗粒趋于紧密,胶结力增强,土体密实度增加,无侧限抗压强度增强。粉煤灰在碱性环境激发下生成胶体增多,规则性较好。通过IPP软件,对碱渣土微观孔隙进行了测量。碱渣土孔隙的等效直径、面积、周长随着元明粉含量的增加而逐渐减小,孔隙的圆度呈现先增大后减小的趋势。
[Abstract]:Alkali residue is an industrial waste produced in the production of soda by ammonia alkali process, which seriously restricts the economic development and endangers the environment.In order to make comprehensive use of alkali slag, the alkali residue was mixed with fly ash in proportion to form alkali residue, and the feasibility of embankment filling was discussed.Through laboratory test, the physical index, mechanical index and microstructure of alkali residue were tested and analyzed.The main research results are as follows: (1) through laboratory tests, the physical indexes of alkali residue are tested, and the related properties of alkali residue under different proportions are discussed from three aspects: limit water content, grain fraction and compaction.The optimum ratio of alkali residue in embankment filling is chosen, that is, the ratio of alkali slag to fly ash is 4: 1.2) through laboratory tests, the mechanical properties of alkali residue are further studied in this paper.The compressive strength and shear strength of alkali residue were measured.In order to further improve the mechanical properties, the mechanical properties of alkali residuals were improved obviously by adding cementitious materials to alkali residuals.The cementitious material content is the alkali residue soil 5 times economy is suitable.The bearing capacity index, modulus of resilience and California bearing ratio of alkali residue are tested, and the results are in accordance with the national highway code.The feasibility of using alkali residue soil in expressway embankment is verified. The microstructure of alkali residue soil is observed by high power microscope. With the increase of powder content, the grain size of alkali residue soil tends to close, the cementation force increases, and the soil compactness increases.The unconfined compressive strength is enhanced.Under the excitation of alkaline environment, fly ash produces more colloids, which is more regular.The micropore of alkali residue was measured by IPP software.The equivalent diameter, area and circumference of the pores of alkali residue soil gradually decrease with the increase of the content of powder, and the roundness of the pores increases first and then decreases.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【共引文献】