钢渣在砂浆与混凝土应用中稳定性研究

发布时间：2018-02-24 16:36

  本文关键词： 钢渣粉 钢渣砂浆 钢渣混凝土 稳定性 压蒸 90℃水热　出处：《沈阳建筑大学》2015年硕士论文　论文类型：学位论文

【摘要】：钢渣是钢铁企业排放的工业废渣,据统计,2013年我国钢渣产生量约为1亿吨,全国钢渣累积堆存已达10亿吨左右。但目前我国钢渣的综合利用率仅为10%。钢渣的大量堆积给人们带来一系列问题,如占用土地资源、污染环境、破坏水质等。钢渣具有一定的胶凝活性,另外,钢渣在坚固性、表面形态、颗粒级配、耐磨性等方面与天然砂石相似,是作为掺合料、骨料的理想材料。但钢渣含有大量“死烧”f-CaO,极大影响建筑物的安全与耐久性。解决钢渣的稳定性问题对于钢渣高效资源化利用具有极大的研究价值。本文采用堆放一年以上的钢渣,将不同粒径的钢渣分别应用于胶凝材料、砂浆与混凝土。研究钢渣对胶凝材料、砂浆、混凝土稳定性的影响。通过添加硅质材料、减小钢渣粒径等方法提高试件的稳定性,采用沸煮法、压蒸法、水热法等不同试验方法综合检验钢渣的稳定性,并用X射线衍射方法分析掺钢渣粉胶凝材料水化后的矿相。在钢渣粉安定性的研究中,实验结果表明,在沸煮条件下,单掺30%钢渣粉胶凝材料的安定性合格,在压蒸条件下,单掺钢渣粉的最大掺量是10%。实验采用添加粉煤灰、硅灰、矿粉等硅质材料以及CaCl2改善钢渣粉的安定性。添加硅质材料后,尤其是粉煤灰与硅灰复掺的情况下,钢渣粉的安定性得到明显改善,但CaCl2对钢渣粉安定性的改善效果不明显。压蒸条件下,通过硅质材料的改善,钢渣粉的掺量可以达到50%。90℃水热实验中,钢渣粉最大掺量为30%,和煮沸法结果一致。通过X射线衍射图谱分析,钢渣粉的掺量越大,胶凝材料水化后Ca(OH)2含量越多。在钢渣砂浆稳定性的研究中,实验结果表明,减小钢渣砂的粒径可以提高钢渣砂浆的稳定性,最大粒径为1.18 mm与0.6 mm钢渣砂的最大掺量分别为10%与15%。实验采用粉煤灰与硅灰等硅质材料改善钢渣砂的稳定性。硅质材料对钢渣砂浆稳定性的改善具有积极的作用,在粉煤灰掺量为25%的情况下,钢渣砂的最大掺量为15%;在粉煤灰掺量为35%的情况下,钢渣砂最大掺量为25%。在90℃水热条件下,钢渣砂中f-CaO与水反应不充分,不能合理表征钢渣砂浆的稳定性。在钢渣混凝土稳定性的研究中,实验结果表明,硅质材料对钢渣石稳定性的改善效果不明显。通过添加硅质材料与合理调节掺量,在粉煤灰掺量为25%的条件下,混凝土中单掺钢渣石的最大掺量为15%。混凝土中添加钢渣粉与钢渣砂后,其稳定性得到一定提高,此情况下,钢渣石的最大掺量为35%。在90℃水热条件下,钢渣石反映出稳定性不良,此时钢渣石的最大掺量为25%。
[Abstract]:Steel slag is an industrial waste discharged by iron and steel enterprises. According to statistics, in 2013, the production of steel slag in China was about 100 million tons. The accumulative storage of steel slag in China has reached about 1 billion tons. But at present, the comprehensive utilization ratio of steel slag in our country is only 10. The accumulation of steel slag has brought a series of problems to people, such as occupying land resources and polluting the environment. Steel slag has a certain cementitious activity, in addition, steel slag is similar to natural sand and stone in the aspects of firmness, surface morphology, particle gradation, wear resistance and so on, and is used as admixture. But the steel slag contains a lot of "dead burning" f-CaO, which greatly affects the safety and durability of buildings. Solving the stability problem of steel slag is of great value for the efficient utilization of steel slag. Steel slag containing more than one year, The influence of steel slag on the stability of cementing material, mortar and concrete was studied. The stability of the specimen was improved by adding siliceous material and reducing the diameter of steel slag. The stability of steel slag was tested by different test methods, such as boiling method, autoclave method and hydrothermal method, and the mineral phase after hydration of cementing material with steel slag powder was analyzed by X-ray diffraction. The experimental results showed that the stability of steel slag powder was studied. Under boiling condition, the stability of cementing material with only 30% steel slag powder is qualified, and the maximum addition amount of steel slag powder is 10 under the condition of autoclaving. Fly ash and silica fume are added to the experiment. The stability of steel slag powder can be improved by adding siliceous materials, especially fly ash and silica fume, and improving the stability of steel slag powder by CaCl2. However, the effect of CaCl2 on the stability of steel slag powder is not obvious. Under the condition of autoclaving, the content of steel slag powder can reach 50.90 鈩，

本文编号：1530951