本文選題：混合骨料混凝土 + 礦物摻合料�。� 參考：《內(nèi)蒙古工業(yè)大學》2013年碩士論文

【摘要】：浮石取代部分碎石骨料,可以使混合骨料混凝土獲得良好的抗凍性能,而為了進一步改善混合骨料混凝土的抗凍性,可嘗試在混凝土中摻入礦物摻合料取代部分水泥。這樣,不僅能改善混凝土的抗凍性能,還減少了水泥用量,有效利用了工業(yè)廢渣。 本文針對浮石替代率為30%的混合骨料混凝土,在單摻和復摻不同種類和摻量的礦物摻合料后,研究其抗凍性能,并分析改善混凝土抗凍性能的最佳礦物摻合料的組合。試驗分別采用單摻30%粉煤灰、復摻20%粉煤灰和10%硅粉、復摻20%粉煤灰和10%礦粉、復摻20%粉煤灰和10%石粉替代水泥,研究礦物摻合料對混合骨料混凝土抗凍性能的影響。 試驗方法是通過快速凍融法測試混凝土的宏觀表現(xiàn),再利用掃描電子顯微鏡(SEM)分析微觀結構和水化產(chǎn)物,以宏觀與微觀相結合的手段全面分析礦物摻合料對混合骨料混凝土抗凍性能的影響�？靸龇ㄒ再|(zhì)量損失率和相對動彈性模量損失率兩項指標衡量混凝土的抗凍性,SEM分析以觀察混凝土最薄弱環(huán)節(jié)—界面過渡區(qū)(ITZ)的微觀結構為依據(jù)評價混凝土的抗凍性。 快凍法試驗結果表明：摻入30%礦物摻合料的混凝土與未摻礦物摻合料的混凝土相比,抗凍性能有不同程度的降低。粉煤灰與硅粉復摻的混合骨料混凝土抗凍性能最高,且接近于未摻摻合料時的抗凍性,粉煤灰與礦粉復摻次之,單摻粉煤灰較低,粉煤灰與石粉復摻最低。 SEM試驗結果表明：摻入30%礦物摻合料的混凝土界面結構與未摻礦物摻合料的混凝土相比均有不同程度的劣化,粉煤灰與石粉復摻劣化最嚴重,單摻粉煤灰次之,粉煤灰與礦粉復摻以及粉煤灰與硅粉復摻的界面稍有劣化,界面結構致密。此外,碎石-水泥石比浮石-水泥石界面結構劣化嚴重,說明浮石骨料可改善混凝土的界面過渡區(qū)。 復摻粉煤灰和硅粉的混合骨料混凝土具有良好的界面過渡區(qū)結構和抗凍性能,因此,研究成果可為寒冷地區(qū)混凝土材料的應用提供試驗和理論依據(jù)。
[Abstract]:In order to further improve the frost resistance of mixed aggregate concrete, pumice stone can replace some crushed stone aggregate. In order to further improve the frost resistance of mixed aggregate concrete, mineral admixture can be used to replace some cement. In this way, not only the frost resistance of concrete can be improved, but also the amount of cement can be reduced, and industrial waste slag can be effectively utilized. In this paper, the antifreeze property of mixed aggregate concrete with 30% pumice substitution rate is studied after mixing with mineral admixtures of different kinds and amounts, and the best mineral admixture combination to improve the frost resistance of concrete is analyzed. 30% fly ash, 20% fly ash and 10% silica powder, 20% fly ash and 10% mineral powder, 20% fly ash and 10% stone powder were added to replace cement respectively. The effect of mineral admixture on the frost resistance of mixed aggregate concrete was studied. The test method is to test the macroscopic behavior of concrete by rapid freeze-thaw method, and then analyze the microstructure and hydration products by scanning electron microscope (SEM). The effect of mineral admixture on the frost resistance of mixed aggregate concrete was analyzed by means of macro and micro analysis. The frozen resistance of concrete was evaluated by using the two indexes of mass loss rate and relative dynamic elastic modulus loss rate. The freezing resistance of concrete was evaluated on the basis of observing the microstructure of the weakest link and interface transition zone (ITZ) of concrete. The results of rapid freezing test show that the frost resistance of concrete with 30% mineral admixture is lower than that of concrete without mineral admixture. The frost resistance of mixed aggregate concrete mixed with fly ash and silica fume is the highest, and it is close to the frost resistance of the concrete without adding fly ash and mineral powder. The mixture of fly ash and mineral powder is the second, only fly ash is lower, and fly ash and stone powder are the lowest. The results of SEM test show that the interfacial structure of concrete mixed with 30% mineral admixture has different degrees of deterioration compared with that of concrete without mineral admixture, the degradation of fly ash and stone powder is the most serious, and only fly ash is the second. The interface between fly ash and mineral powder and between fly ash and silica powder is slightly deteriorated and the interface structure is compact. In addition, the interface structure of pumice and cement stone is worse than that of pumice and cement stone, which indicates that pumice aggregate can improve the interfacial transition zone of concrete. The mixed aggregate concrete mixed with fly ash and silica fume has good interfacial transition zone structure and frost resistance. Therefore, the research results can provide experimental and theoretical basis for the application of concrete materials in cold regions.
【學位授予單位】：內(nèi)蒙古工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528

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本文編號：1790279