本文選題：廢混凝土粉　切入點(diǎn)：廢混凝土再生骨料　出處：《北方工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國建筑垃圾的數(shù)量已占到城市垃圾總量的80%-90%,但資源化率卻不足5%,建筑垃圾中30%-40%為廢混凝土,因此,如何有效地處理這些建筑廢棄物成為了我們必須面對(duì)的課題,也是實(shí)現(xiàn)資源再利用的關(guān)鍵。GRC制品具有質(zhì)輕、抗裂、抗沖擊等諸多優(yōu)點(diǎn),但是,GRC制品的長期耐久性能降低問題一直限制其在更大范圍內(nèi)應(yīng)用。因此,為了提高廢混凝土的再利用率,同時(shí)改善GRC制品的長期耐久性能,本課題將廢混凝土應(yīng)用到GRC中,分析廢混凝土對(duì)GRC耐久性的影響。本課題主要解決以下問題:①研究以廢混凝土再生骨料取代GRC中的天然砂及其與粉煤灰、硅灰復(fù)摻對(duì)GRC性能的影響。②研究以不同細(xì)度廢混凝土粉取代GRC中的水泥對(duì)GRC性能的影響。③研究以廢混凝土粉取代GRC中的水泥及其與粉煤灰、硅灰聯(lián)合使用對(duì)GRC性能的影響。④研究以廢混凝土骨料和廢混凝土粉同時(shí)分別取代GRC中的天然砂和水泥對(duì)GRC性能的影響。試驗(yàn)結(jié)果表明:①使用廢混凝土骨料對(duì)GRC性能的改善是有效的,其中以30%廢混凝土骨料取代GRC中天然砂的試驗(yàn)組較基準(zhǔn)組表現(xiàn)出較好的耐久性。而單摻30%粉煤灰或復(fù)摻20%粉煤灰和10%硅灰時(shí),GRC的耐久性較單摻30%廢混凝土骨料時(shí)還有較大提高。②使用10%的廢混凝土粉取代GRC中的水泥并不能達(dá)到改善GRC耐久性的效果,而且養(yǎng)護(hù)的齡期越長時(shí),GRC中的玻璃纖維受腐蝕越嚴(yán)重,致使GRC的耐久性有所下降,且廢混凝土粉越細(xì),玻璃纖維被腐蝕也越嚴(yán)重,耐久性的下降幅度也越大。③當(dāng)30%廢混凝土骨料與10%廢混凝土粉復(fù)合使用時(shí),GRC的耐久性較單摻10%廢混凝土粉時(shí)有所提高,但不如單獨(dú)使用30%廢混凝土骨料時(shí)效果好。從玻璃纖維被腐蝕的程度也可以看出,單摻10%廢混凝土粉的試驗(yàn)組最嚴(yán)重,單摻30%廢混凝土骨料的最輕,而二者復(fù)摻時(shí),介于二者之間。④當(dāng)30%廢混凝土骨料與30%粉煤灰復(fù)摻或與20%粉煤灰和10%硅灰復(fù)摻時(shí),GRC的耐久性較基準(zhǔn)組和單摻30%廢混凝土骨料組有了很大的提高,兩者的玻璃纖維被腐蝕情況也較基準(zhǔn)組和單摻30%廢混凝土骨料組有很大程度的減輕。⑤10%廢混凝土粉與30%粉煤灰復(fù)摻或與20%粉煤灰和10%硅灰復(fù)摻可以有效改善GRC的耐久性,且比單摻10%廢混凝土粉效果要好,同時(shí),基體中玻璃纖維被腐蝕程度也明顯減輕。⑥單摻30%廢混凝土骨料時(shí),GRC基體中CH的結(jié)晶程度和玻璃纖維表面被腐蝕程度較基準(zhǔn)組有所減輕。當(dāng)30%廢混凝土骨料與30%粉煤灰復(fù)摻或與20%粉煤灰和10%硅灰復(fù)摻時(shí),GRC基體中CH的結(jié)晶程度和玻璃纖維表面被腐蝕程度較單摻30%廢混凝土骨料組還要有所減輕。⑦單摻10%廢混凝土粉時(shí),GRC基體中CH的結(jié)晶程度和玻璃纖維表面被腐蝕程度較基準(zhǔn)組有所增強(qiáng)。但當(dāng)10%廢混凝土粉與30%粉煤灰復(fù)摻或與20%粉煤灰和10%硅灰復(fù)摻時(shí),GRC基體中CH的結(jié)晶程度和玻璃纖維表面被腐蝕程度較基準(zhǔn)組有所減輕。
[Abstract]:The amount of construction waste in our country has already accounted for 80-90% of the total amount of municipal waste, but the rate of utilization is less than 5%. 30% -40% of construction waste is waste concrete. Therefore, how to deal with these construction wastes effectively has become a subject that we must face. GRC products have many advantages, such as light weight, crack resistance, impact resistance and so on. However, the long-term durability of GRC products can reduce the problem of reducing the long-term durability of GRC products. In order to improve the reuse rate of waste concrete and improve the long-term durability of GRC products, this paper applies waste concrete to GRC. This paper analyzes the influence of waste concrete on the durability of GRC. This subject mainly solves the following problem: 1. Research on replacing natural sand and fly ash in GRC with recycled aggregate of waste concrete. Effect of silica fume admixture on GRC performance. The influence of replacing cement in GRC with waste concrete powder of different fineness on the performance of GRC. 3. Study on replacing cement in GRC with waste concrete Powder and its relation with fly Ash. Effect of silica fume combined use on GRC performance. 4 the effect of replacing natural sand and cement in GRC with waste concrete aggregate and waste concrete powder at the same time on the performance of GRC is studied. The test results show that the use of waste concrete aggregate at 1 / 1 has effect on GRC performance. The improvements that can be made are effective. The test group with 30% waste concrete aggregate instead of natural sand in GRC showed better durability than the reference group, while the test group with only 30% fly ash or 20% fly ash and 10% silica fume had better durability than 30% waste concrete aggregate. The use of waste concrete powder of 10% instead of cement in GRC does not improve the durability of GRC. Moreover, the longer the curing age is, the more serious the corrosion of glass fiber in GRC is, and the finer the waste concrete powder, the more serious the corrosion of glass fiber is. When 30% waste concrete aggregate and 10% waste concrete powder are used together, the durability of GRC is improved compared with that of 10% waste concrete powder. However, it is better to use 30% waste concrete aggregate alone. From the degree of corrosion of glass fiber, it can be seen that the test group with only 10% waste concrete powder is the most serious, and only 30% waste concrete aggregate is the lightest, and when both are mixed together, The durability of 30% waste concrete aggregate mixed with 30% fly ash or 20% fly ash and 10% silica fume is better than that of reference group and 30% waste concrete aggregate group. The corrosion of glass fiber in both groups can also be reduced to a great extent than that of standard group and 30% waste concrete aggregate group. 510% waste concrete powder and 30% fly ash co-admixture or 20% fly ash and 10% silica fume can effectively improve the durability of GRC. And the effect is better than only 10% waste concrete powder, at the same time, The degree of corrosion of glass fiber in matrix was also significantly reduced. 6. 6. The degree of Ch crystallization in matrix and the corrosion degree of glass fiber surface in the matrix were less than those in the reference group. When the aggregate of 30% waste concrete and 30% powder were added, the degree of Ch in the matrix and the corrosion degree of glass fiber in the matrix were also reduced. When coal ash is mixed with 20% fly ash and 10% silica fume, the crystallization degree of Ch and the corrosion degree of glass fiber surface in GRC matrix are more reduced than that in 30% waste concrete aggregate group. 7. 7 and 10% waste concrete powder are added to GRC matrix. The crystallization degree of Ch and the corrosion degree of glass fiber surface were stronger than those of the reference group, but when 10% waste concrete powder was mixed with 30% fly ash or 20% fly ash and 10% silica fume were mixed, the degree of Ch crystallinity and glass fiber in the matrix were increased. The corrosion degree of the surface is less than that of the reference group.
【學(xué)位授予單位】：北方工業(yè)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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