本文選題：自燃煤矸砂混凝土 + 細(xì)集料預(yù)處理��； 參考：《遼寧工程技術(shù)大學(xué)》2014年碩士論文

【摘要】：自燃煤矸石集料以其質(zhì)量較好、儲(chǔ)量較大、易開采、價(jià)格低廉的特點(diǎn),在輕集料家族中占一席之地。但隨著預(yù)拌混凝土的廣泛應(yīng)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(duì)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(guó)家自然科學(xué)基金委員會(huì)與神華集團(tuán)有限公司聯(lián)合資助項(xiàng)目—“煤矸石在水泥和混凝土中資源化利用關(guān)鍵科學(xué)問題研究”(U1261122)中的子項(xiàng)目,通過采取對(duì)自燃煤矸砂預(yù)處理、復(fù)摻礦物摻合料、外加劑等技術(shù)途徑,實(shí)現(xiàn)配制大流動(dòng)性、高耐久性自燃煤矸砂混凝土的配制目標(biāo)。取得如下研究成果：(1)機(jī)械破碎的自燃煤矸砂,顆粒級(jí)配較差,若與天然砂合理組配,可以滿足混凝土用細(xì)集料的質(zhì)量要求。(2)通過對(duì)自燃煤矸砂預(yù)處理,以及復(fù)摻高效減水劑、礦物摻合料,當(dāng)自燃煤矸砂全部取代天然砂,仍可配制出大流動(dòng)、中等強(qiáng)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(rùn)濕,拌合物在保證大流動(dòng)性預(yù)拌混凝土配制要求的基礎(chǔ)上,硬化強(qiáng)度等級(jí)也能滿足結(jié)構(gòu)設(shè)計(jì)要求。(4)中等強(qiáng)度等級(jí)的自燃煤矸砂混凝土正交試驗(yàn)表明,膠凝材料之間的質(zhì)量比對(duì)混凝土拌合物坍落度影響顯著；外加劑之間的質(zhì)量比對(duì)拌合物坍落度影響不顯著。當(dāng)水泥：粉煤灰：礦粉=80：10：10,減水劑：引氣劑=0.8：0.2時(shí),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(zhì)量比、膠凝材料之間的質(zhì)量比對(duì)混凝土28d抗壓強(qiáng)度影響都比較明顯,影響程度為：外加劑之間的質(zhì)量比大于膠凝材料之間的質(zhì)量比。當(dāng)水泥：粉煤灰：礦粉=80：10：10,減水劑：引氣劑=1：0時(shí),混凝土抗壓強(qiáng)度達(dá)到最高。(5)自燃煤矸砂混凝土抗氯離子滲透和抗凍性試驗(yàn)表明,外加劑之間的質(zhì)量比對(duì)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(zhì)量比對(duì)抗氯離子滲透無(wú)明顯影響；當(dāng)凍融循環(huán)次數(shù)小于100次時(shí),兩因素對(duì)其影響均不明顯,但當(dāng)凍融循環(huán)次數(shù)大于150次時(shí),膠凝材料質(zhì)量比對(duì)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(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 周梅;王強(qiáng);牟爽;;自燃煤矸石粗集料特性對(duì)混凝土拌合物工作性影響研究[J];非金屬礦;2013年01期

2 周梅;牟爽;王強(qiáng);;基于正交設(shè)計(jì)的大流動(dòng)性自燃煤矸石全輕混凝土試驗(yàn)研究[J];非金屬礦;2012年06期

3 肖前慧;牛荻濤;朱文憑;;粉煤灰引氣混凝土凍融循環(huán)后性能的試驗(yàn)研究[J];武漢理工大學(xué)學(xué)報(bào);2010年07期

4 周梅;吳英強(qiáng);張曉帆;;自燃煤矸石復(fù)合活化的正交試驗(yàn)研究[J];硅酸鹽通報(bào);2009年06期

5 季小兵;王志堅(jiān);魏光輝;;摻粉煤灰塑性混凝土配制技術(shù)研究[J];人民黃河;2009年03期

6 商?hào)|坡,單旭輝;直接最優(yōu)化方法在混凝土配合比試驗(yàn)中的應(yīng)用[J];南水北調(diào)與水利科技;2005年S1期

7 楊錢榮;朱蓓蓉;;摻粉煤灰和引氣劑混凝土氯離子滲透性能研究[J];低溫建筑技術(shù);2005年05期

8 許錫業(yè),韋建設(shè),鄧日南;樂灘砂石系統(tǒng)人工砂細(xì)度模數(shù)的控制[J];紅水河;2004年04期

9 馬成理;自燃煤矸石的材料性能試驗(yàn)研究[J];太原理工大學(xué)學(xué)報(bào);2003年02期

，

本文編號(hào)：1859819