發(fā)布時(shí)間：2018-02-24 16:36

  本文關(guān)鍵詞： 鋼渣粉 鋼渣砂漿 鋼渣混凝土 穩(wěn)定性 壓蒸 90℃水熱　出處：《沈陽建筑大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼渣是鋼鐵企業(yè)排放的工業(yè)廢渣,據(jù)統(tǒng)計(jì),2013年我國(guó)鋼渣產(chǎn)生量約為1億噸,全國(guó)鋼渣累積堆存已達(dá)10億噸左右。但目前我國(guó)鋼渣的綜合利用率僅為10%。鋼渣的大量堆積給人們帶來一系列問題,如占用土地資源、污染環(huán)境、破壞水質(zhì)等。鋼渣具有一定的膠凝活性,另外,鋼渣在堅(jiān)固性、表面形態(tài)、顆粒級(jí)配、耐磨性等方面與天然砂石相似,是作為摻合料、骨料的理想材料。但鋼渣含有大量“死燒”f-CaO,極大影響建筑物的安全與耐久性。解決鋼渣的穩(wěn)定性問題對(duì)于鋼渣高效資源化利用具有極大的研究?jī)r(jià)值。本文采用堆放一年以上的鋼渣,將不同粒徑的鋼渣分別應(yīng)用于膠凝材料、砂漿與混凝土。研究鋼渣對(duì)膠凝材料、砂漿、混凝土穩(wěn)定性的影響。通過添加硅質(zhì)材料、減小鋼渣粒徑等方法提高試件的穩(wěn)定性,采用沸煮法、壓蒸法、水熱法等不同試驗(yàn)方法綜合檢驗(yàn)鋼渣的穩(wěn)定性,并用X射線衍射方法分析摻鋼渣粉膠凝材料水化后的礦相。在鋼渣粉安定性的研究中,實(shí)驗(yàn)結(jié)果表明,在沸煮條件下,單摻30%鋼渣粉膠凝材料的安定性合格,在壓蒸條件下,單摻鋼渣粉的最大摻量是10%。實(shí)驗(yàn)采用添加粉煤灰、硅灰、礦粉等硅質(zhì)材料以及CaCl2改善鋼渣粉的安定性。添加硅質(zhì)材料后,尤其是粉煤灰與硅灰復(fù)摻的情況下,鋼渣粉的安定性得到明顯改善,但CaCl2對(duì)鋼渣粉安定性的改善效果不明顯。壓蒸條件下,通過硅質(zhì)材料的改善,鋼渣粉的摻量可以達(dá)到50%。90℃水熱實(shí)驗(yàn)中,鋼渣粉最大摻量為30%,和煮沸法結(jié)果一致。通過X射線衍射圖譜分析,鋼渣粉的摻量越大,膠凝材料水化后Ca(OH)2含量越多。在鋼渣砂漿穩(wěn)定性的研究中,實(shí)驗(yàn)結(jié)果表明,減小鋼渣砂的粒徑可以提高鋼渣砂漿的穩(wěn)定性,最大粒徑為1.18 mm與0.6 mm鋼渣砂的最大摻量分別為10%與15%。實(shí)驗(yàn)采用粉煤灰與硅灰等硅質(zhì)材料改善鋼渣砂的穩(wěn)定性。硅質(zhì)材料對(duì)鋼渣砂漿穩(wěn)定性的改善具有積極的作用,在粉煤灰摻量為25%的情況下,鋼渣砂的最大摻量為15%;在粉煤灰摻量為35%的情況下,鋼渣砂最大摻量為25%。在90℃水熱條件下,鋼渣砂中f-CaO與水反應(yīng)不充分,不能合理表征鋼渣砂漿的穩(wěn)定性。在鋼渣混凝土穩(wěn)定性的研究中,實(shí)驗(yàn)結(jié)果表明,硅質(zhì)材料對(duì)鋼渣石穩(wěn)定性的改善效果不明顯。通過添加硅質(zhì)材料與合理調(diào)節(jié)摻量,在粉煤灰摻量為25%的條件下,混凝土中單摻鋼渣石的最大摻量為15%�；炷林刑砑愉撛叟c鋼渣砂后,其穩(wěn)定性得到一定提高,此情況下,鋼渣石的最大摻量為35%。在90℃水熱條件下,鋼渣石反映出穩(wěn)定性不良,此時(shí)鋼渣石的最大摻量為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，

本文編號(hào)：1530951