本文關(guān)鍵詞： 鋼渣骨料 鋼渣粉 混凝土 力學(xué)性能 耐久性能　出處：《西安建筑科技大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：我國鋼鐵產(chǎn)業(yè)中鋼渣廢棄物的年排放量約為鋼鐵產(chǎn)量的15％～20％，大量廢棄鋼渣的排放引發(fā)了一系列環(huán)境保護問題，嚴(yán)重影響了環(huán)境和居民的正常生活；另外大量閑置場地的堆放占用，也帶來一定的經(jīng)濟負(fù)擔(dān)與資源損失。隨著混凝土行業(yè)的復(fù)合化發(fā)展趨勢與工業(yè)廢棄物的高利用率需求，鋼渣在混凝土中大摻量、高利用率及多樣化的循環(huán)利用方式有待深入系統(tǒng)研究。 本課題以鋼渣的高附加值利用為研究目的，將粗破、篩分后的顆粒狀鋼渣作粗骨料，，磨細(xì)至一定細(xì)度的鋼渣粉作摻合料，分別替代混凝土天然碎石骨料與水泥制備雙摻鋼渣混凝土。 試驗以鋼渣混凝土體積穩(wěn)定性良好為前提，開展雙摻鋼渣粗骨料/鋼渣粉混凝土的宏觀力學(xué)性能、耐久性能與長期性能試驗研究；并利用掃描電鏡、XRD衍射、顯微硬度等微觀測試手段，對不同骨料-水泥石界面與復(fù)合膠凝體系組成的微觀結(jié)構(gòu)進行了分析。 試驗結(jié)果表明：以鋼渣粗骨料25%替代天然碎石為基礎(chǔ)，鋼渣粉30%/40%替代水泥作摻合料，雙摻鋼渣混凝土體積穩(wěn)定性合格，力學(xué)性能、耐久性能滿足試驗設(shè)計指標(biāo)；其中，25%鋼渣骨料、30%鋼渣粉試樣組能夠顯著改善混凝土抗壓、抗碳化、抗硫酸鹽侵蝕等性能；值得重點關(guān)注的是，在雙摻25%鋼渣骨料與30%鋼渣粉基礎(chǔ)上復(fù)摻20%礦渣粉，混凝土的力學(xué)性能、耐久性能均表現(xiàn)最佳，鋼渣粗骨料與廢渣摻合料替代量分別達到25%、50%，實現(xiàn)了大摻量鋼渣混凝土的研究目標(biāo)。 混凝土微觀結(jié)構(gòu)試驗表明：鋼渣骨料與水泥石的界面結(jié)構(gòu)完整致密，顯微硬度值高于天然碎石與水泥石界面區(qū)；復(fù)合膠凝體系水化程度較高、膠凝材料水化充分，該微觀特性為雙摻鋼渣混凝土優(yōu)良的宏觀性能表現(xiàn)提供了理論依據(jù)。
[Abstract]:The annual discharge of steel slag waste in China's iron and steel industry is about 15% of the iron and steel output. The discharge of a large number of discarded steel slag has caused a series of environmental protection problems, which have seriously affected the environment and the normal life of the residents. In addition, a large number of idle sites have been stacked and occupied. It also brings some economic burden and resource loss. With the development trend of concrete industry and the demand of high utilization ratio of industrial waste, steel slag is heavily added in concrete. The high utilization rate and diversification of recycling methods need to be deeply and systematically studied. The purpose of this project is to use the high added value of steel slag as the research object. The granular steel slag after coarse breaking and sieving is used as coarse aggregate, and the steel slag powder with a certain fineness is used as admixture. Instead of natural crushed stone aggregate and cement, double-mixed steel slag concrete was prepared. On the premise of good volume stability of steel slag concrete, the macro mechanical properties, durability and long term performance of steel slag coarse aggregate / steel slag powder concrete were studied. The microstructure of different aggregate-cement stone interface and composite cementing system was analyzed by means of microhardness and microhardness. The test results show that the volume stability, mechanical properties and durability of steel slag concrete can meet the test design index with steel slag coarse aggregate 25% instead of natural crushed stone and steel slag powder 30% / 40% instead of cement as admixture. Among them, 25% steel slag aggregate and 30% steel slag powder sample group can significantly improve the compressive resistance, carbonation resistance and sulfate corrosion resistance of concrete, and the emphasis should be paid to the addition of 20% slag powder on the basis of 25% steel slag aggregate and 30% steel slag powder. The mechanical properties and durability of concrete are the best. The substitution quantity of steel slag coarse aggregate and waste slag admixture is 25 / 50 respectively, which realizes the research goal of large amount of steel slag concrete. The microstructure test of concrete shows that the interface structure of steel slag aggregate and cement stone is complete and compact, the microhardness value is higher than that of natural crushed stone and cement stone interface, the hydration degree of composite cementing system is higher, and the hydration of cementing material is sufficient. This microscopic property provides a theoretical basis for the excellent macroscopic performance of double-mixed steel slag concrete.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528

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