碱渣和粉煤灰液相混合制取工程土的试验研究

发布时间：2019-06-09 16:23

【摘要】：碱渣是氨碱法生产纯碱的过程中产生的工业废料。将碱渣与粉煤灰等其他的原料按照一定的比例拌合而成的混合料，称为碱渣土。碱渣的大量堆积和污染严重地阻碍了纯碱生产企业的发展。因此，对碱渣的治理与利用已经成为迫在眉睫的问题。本文通过室内试验与野外试验相结合的技术手段，利用吹填的方式，将碱渣与粉煤灰等混合制取工程土，用于工程填垫起到了大量利用碱渣的目的。 本文主要介绍了碱渣的研究现状、生成过程、微观结构及物理化学性质，并分析了粉煤灰对碱渣土的强度提高机理。 本文通过室内试验确定了碱渣和粉煤灰的最优配合比，主要做了最优配合比碱渣土的物理指标试验、击实试验、压缩试验、抗剪强度试验、无侧限抗压强度试验、渗透试验及室内模拟混合浆液沉淀均匀性试验，由此确定了碱渣土作为工程土的可能性，，并得出了碱渣土作为回填土时的各种参数。 室内试验的研究结果表明碱渣土可作为一般工程土使用。选取碱渣土的最优配合比进行野外吹填试验，并对吹填后经渗漏和晾晒的工程土进行密实度、承载力及均匀性检测，结果表明碱渣土能够满足一般工程的要求。 本文对碱渣土野外吹填的工艺流程及后期的强度、密实度及均匀性等进行了深入系统的研究，推荐了一种简便实用填筑方法，促进了碱渣的资源化利用，减少了环境的污染，有益于当地经济快速高效的发展。 本试验研究具有以下特点： （1）提出了吹填法解决碱渣问题的新工艺。 （2）通过室内试验确定了碱渣土的最优配合比，即碱渣与粉煤灰的比例为7:3。 （3）利用触探试验对野外吹填效果进行强度、密实度及均匀性检测，简便可行。
[Abstract]:Alkali slag is an industrial waste produced in the process of producing soda by ammonia-alkali process. The mixture of alkali slag and fly ash and other raw materials in a certain proportion is called alkali slag soil. The accumulation and pollution of alkali slag seriously hinder the development of soda production enterprises. Therefore, the treatment and utilization of alkali slag has become an urgent problem. In this paper, through the combination of laboratory test and field test, alkali slag and fly ash are mixed to produce engineering soil by means of blowing filling, which has been used in engineering filling pad to make a lot of use of alkali slag. In this paper, the research status, formation process, microstructure and physicochemical properties of alkali slag are introduced, and the mechanism of improving the strength of alkali slag soil by fly ash is analyzed. In this paper, the optimal mixture ratio of alkali slag and fly ash is determined by laboratory test, and the physical index test, compaction test, compression test, shear strength test and unconfined compressive strength test of alkali slag soil are mainly carried out. The possibility of alkali slag soil as engineering soil is determined by infiltration test and laboratory simulation mixed slurry precipitation uniformity test, and various parameters of alkali slag soil as backfill are obtained. The results of laboratory test show that alkali slag soil can be used as general engineering soil. The optimal mix ratio of alkali slag soil was selected to carry out field filling test, and the compactness, bearing capacity and uniformity of the engineering soil after leakage and drying were tested. The results show that the alkali slag soil can meet the requirements of general engineering. In this paper, the technological process, strength, compactness and uniformity of alkali slag soil in the field are studied deeply and systematically, and a simple and practical filling method is recommended, which promotes the utilization of alkali slag resources and reduces the pollution of the environment. It is beneficial to the rapid and efficient development of the local economy. The experimental study has the following characteristics: (1) A new process for solving alkali slag problem by blowing filling method is put forward. (2) the optimal mixture ratio of alkali slag soil is determined by laboratory test, that is, the ratio of alkali slag to fly ash is 7 鈮

本文编号：2495700