【摘要】：礦渣是一種冶金工業(yè)副產(chǎn)品,在我國排放量巨大,其堆積和排放對環(huán)境造成不利影響。礦渣目前主要用于生產(chǎn)礦渣水泥或作為混凝土的外摻料,且利用率不高。研究發(fā)現(xiàn)用堿激發(fā)礦渣活性并用于制作堿礦渣水泥和混凝土,其性能優(yōu)異,對資源的消耗少,是一種十分環(huán)保的材料。隨著我國城鎮(zhèn)化的加快,大量構(gòu)筑物被拆除,隨之而來的是大量的固體廢棄物,其中大部分是廢棄混凝土。將廢棄混凝土破碎加工成為再生骨料配制混凝土的研究也受到越來越多的關(guān)注。而將堿礦渣水泥與再生骨料兩者結(jié)合使用是一個(gè)新的思路,在國內(nèi)這方面研究較少。這種新型材料的研究,對節(jié)約資源、保護(hù)環(huán)境的可持續(xù)發(fā)展戰(zhàn)略具有重要意義。本課題利用云南昆鋼嘉華水泥建材有限公司生產(chǎn)的磨細(xì)高爐礦渣粉作為原材料,對堿礦渣水泥和堿礦渣再生骨料混凝土進(jìn)行試驗(yàn)研究。通過調(diào)整堿濃度、水玻璃模數(shù)、溶礦比三個(gè)因素設(shè)計(jì)正交試驗(yàn)方案,運(yùn)用極差法分析法和方差分析法分析這三個(gè)因素對堿礦渣水泥性能(凝結(jié)時(shí)間、流動(dòng)度、膠砂強(qiáng)度等)的影響程度,找出堿礦渣水泥較優(yōu)配合比成型試件,并利用掃描電鏡對堿礦渣水泥內(nèi)部結(jié)構(gòu)進(jìn)行微觀試驗(yàn)分析。在此基礎(chǔ)上,用較優(yōu)配比的堿礦渣水泥(堿濃度6%、水玻璃模數(shù)1.0、溶礦比0.55),改變再生骨料替代率和再生骨料附加水不同加水方式,配制堿礦渣再生骨料混凝土。研究再生粗骨料替代率(0、20%、40%、60%、80%、100%)和再生粗骨料附加水不同加水方式(一次加水、二次加水)對堿礦渣再生骨料混凝土的工作性能、干燥收縮、抗壓強(qiáng)度和彈性模量的影響規(guī)律。再生骨料替代率低于60%時(shí),隨著再生骨料替代率的增加,對堿礦渣再生骨料混凝土的工作性能、干燥收縮、抗壓強(qiáng)度和彈性模量影響不大。用二次加水拌制堿礦渣再生骨料混凝土,溶礦比與理論值接近,其干燥收縮、抗壓強(qiáng)度、彈性模量測試結(jié)果更好。該課題研究,不僅為礦渣微粉的推廣應(yīng)用找到新途徑,同時(shí)還可為堿礦渣再生骨料混凝土在工程中的應(yīng)用奠定理論基礎(chǔ)。
[Abstract]:Slag is a by-product of metallurgical industry. Slag is mainly used to produce slag cement or admixture of concrete, and the utilization ratio is not high. It is found that alkaline activated slag can be used to make alkali slag cement and concrete with excellent properties and low consumption of resources. It is a kind of environmental protection material. With the acceleration of urbanization in China, a large number of structures have been demolished, followed by a large number of solid waste, most of which is waste concrete. More and more attention has been paid to the process of crushing waste concrete into recycled aggregate to prepare concrete. The combination of alkali slag cement and recycled aggregate is a new idea. The research of this new material is of great significance to the sustainable development strategy of saving resources and protecting the environment. Using the pulverized blast furnace slag powder produced by Jiahua cement Building Materials Co., Ltd of Yunnan Kunming Iron and Steel Co., Ltd as raw material, the test study on alkali slag cement and recycled aggregate concrete from alkali slag is carried out. By adjusting the concentration of alkali, the modulus of sodium silicate and the ratio of dissolved ore to mineral solution, the orthogonal test scheme was designed. The performance of alkali slag cement (setting time, fluidity) was analyzed by means of range analysis method and variance analysis method. The optimum mix ratio of alkali slag cement was found out, and the microstructure of alkali slag cement was analyzed by scanning electron microscope. On this basis, the recycled aggregate concrete of alkali slag was prepared by changing the replacement rate of recycled aggregate and the different ways of adding water to recycled aggregate with the optimum ratio of alkali slag cement (alkali concentration 6, water glass modulus 1.0, dissolved ore ratio 0.55). The effects of the replacement ratio of recycled coarse aggregate (020%) and recycled coarse aggregate plus water (primary water, secondary water) on the working performance, drying shrinkage, compressive strength and elastic modulus of recycled aggregate concrete were studied. When the replacement ratio of recycled aggregate is lower than 60, with the increase of the replacement ratio of recycled aggregate, there is little effect on the working performance, drying shrinkage, compressive strength and elastic modulus of alkali slag recycled aggregate concrete. The ratio of dissolved ore to the theoretical value of reclaimed aggregate concrete made of alkali slag mixed with secondary water is close to the theoretical value, and the test results of drying shrinkage, compressive strength and elastic modulus are better. The research will not only find a new way for the application of slag powder, but also lay a theoretical foundation for the application of alkali slag recycled aggregate concrete in engineering.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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