本文選題：自燃煤矸砂混凝土 + 細集料預處理　； 參考：《遼寧工程技術大學》2014年碩士論文

【摘要】：自燃煤矸石集料以其質量較好、儲量較大、易開采、價格低廉的特點,在輕集料家族中占一席之地。但隨著預拌混凝土的廣泛應用,自燃煤矸石集料由于孔隙率大、吸水率高,攪拌過程中吸收混凝土中的拌合水,使拌合物干稠,坍落度較小。另外,對自燃煤矸石集料配制的混凝土耐久性研究也較少。本文是國家自然科學基金委員會與神華集團有限公司聯(lián)合資助項目—“煤矸石在水泥和混凝土中資源化利用關鍵科學問題研究”(U1261122)中的子項目,通過采取對自燃煤矸砂預處理、復摻礦物摻合料、外加劑等技術途徑,實現(xiàn)配制大流動性、高耐久性自燃煤矸砂混凝土的配制目標。取得如下研究成果：(1)機械破碎的自燃煤矸砂,顆粒級配較差,若與天然砂合理組配,可以滿足混凝土用細集料的質量要求。(2)通過對自燃煤矸砂預處理,以及復摻高效減水劑、礦物摻合料,當自燃煤矸砂全部取代天然砂,仍可配制出大流動、中等強度、高耐久性的自燃煤矸砂混凝土。(3)自燃煤矸砂的附加用水為吸水率60%,且提前10min吮水潤濕,拌合物在保證大流動性預拌混凝土配制要求的基礎上,硬化強度等級也能滿足結構設計要求。(4)中等強度等級的自燃煤矸砂混凝土正交試驗表明,膠凝材料之間的質量比對混凝土拌合物坍落度影響顯著；外加劑之間的質量比對拌合物坍落度影響不顯著。當水泥：粉煤灰：礦粉=80：10：10,減水劑：引氣劑=0.8：0.2時,拌合物在保證粘聚性和保水性良好的前提下,坍落度最大；外加劑之間的質量比、膠凝材料之間的質量比對混凝土28d抗壓強度影響都比較明顯,影響程度為：外加劑之間的質量比大于膠凝材料之間的質量比。當水泥：粉煤灰：礦粉=80：10：10,減水劑：引氣劑=1：0時,混凝土抗壓強度達到最高。(5)自燃煤矸砂混凝土抗氯離子滲透和抗凍性試驗表明,外加劑之間的質量比對自燃煤矸砂混凝土抗氯離子滲透性能影響特別顯著,膠凝材料質量比對抗氯離子滲透無明顯影響；當凍融循環(huán)次數小于100次時,兩因素對其影響均不明顯,但當凍融循環(huán)次數大于150次時,膠凝材料質量比對抗凍性能影響程度逐漸明顯。
[Abstract]:The spontaneous combustion gangue aggregate has the characteristics of good quality, large reserves, easy mining and low price, so it occupies a place in the light aggregate family. However, with the wide application of ready-mixed concrete, the spontaneous combustion gangue aggregate has high porosity and high water absorption, and absorbs the mixing water in the mixing process, which makes the mixture dry thick and the slump is small. In addition, the durability of concrete prepared by spontaneous combustion gangue aggregate is less. This paper is a sub-project of the National Natural Science Foundation Committee of China and Shenhua Group Co., Ltd., which is a sub-project of "Research on the key Scientific problems of the Utilization of Coal gangue in cement and concrete". The compounding of mineral admixture and admixture can achieve the preparation goal of high fluidity and high durability self-burning gangue sand concrete. The following research results are obtained: 1) the grain gradation of mechanically broken self-coal gangue sand is poor. If it is properly combined with natural sand, it can meet the quality requirement of fine aggregate for concrete. Mineral admixture, when the natural sand is completely replaced by the self-coal gangue sand, it can still be prepared with large flowing, medium strength and high durability self-coal gangue sand concrete. On the basis of ensuring the preparation requirement of high fluidity ready-mixed concrete, the hardening strength grade can also meet the structural design requirements. 4) the orthogonal test of self-coal gangue sand concrete with medium strength grade shows that, The mass ratio of cementitious material has a significant effect on the slump of concrete mixture, while the mass ratio of admixture has no significant effect on the slump of concrete mixture. When cement: fly ash: mineral powder 80: 10: 10, water reducer: air entraining agent = 0.8: 0.2, the mixture has the highest slump under the premise of good cohesion and water retention; the mass ratio between admixtures, The influence of the mass ratio of the cementing materials on the compressive strength of concrete for 28 days is obvious, and the influence degree is that the mass ratio between admixtures is greater than the mass ratio between the cementing materials. When cement: fly ash: mineral powder 80: 10: 10, water reducer: air entraining agent 1: 0, the compressive strength of concrete reaches the highest. The effect of the mass ratio between admixtures on the chloride ion permeability of the concrete from coal burning gangue sand is particularly significant, and the cement material mass ratio has no obvious effect on the chloride ion permeation, and when the freeze-thaw cycle times are less than 100 times, However, when the freeze-thaw cycles were more than 150 times, the effect of the mass ratio of the cementing material on the freezing resistance was gradually obvious.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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本文編號：1859819